CN102925851A - Two-section gas nitridation method for surfaces of aluminum and aluminum alloy - Google Patents
Two-section gas nitridation method for surfaces of aluminum and aluminum alloy Download PDFInfo
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Abstract
The invention relates to a two-section gas nitridation method for the surfaces of aluminum and aluminum alloy. The method comprises a surface oxidation film removing step and a surface nitridation treatment step. The step 1 comprises the following steps of: pre-treating; primarily galvanizing zinc; washing by water; removing zinc; secondarily galvanizing zinc; and drying after water washing. The step 2 comprises the following steps of: exhausting in a furnace, wherein the ammonia resolution ratio is less than 10%; primarily heating to 570-590 DEG C, wherein the ammonia resolution ratio is 15-25%; carrying out one-section nitridation, wherein the furnace temperature is 580-640DEG C, and the ammonia resolution ratio is kept at 15-25%; secondarily heating to 620-640 DEG C, wherein the ammonia resolution ratio is 40-55%; carrying out two-section nitridation, wherein the temperature is 620-640DEG C, and the ammonia resolution ratio is 40-55%; and denitriding, wherein the furnace temperature is 580-640DEG C, and the ammonia resolution ratio is controlled at 70-80%. The two-section gas nitridation method has the advantages that compact oxidation films on the surfaces of aluminum and the aluminum alloy can be effectively eliminated, the nitrogen atom can be preferably infiltrated, the nitridation treatment can be carried out by a common gas nitridation furnace, and the two-section gas nitridation method is low in production cost, simple and easy to operate, wide in adaptability, and good in infiltration layer quality.
Description
Technical field
The present invention relates to a kind of thermal treatment process of aluminium alloy, relate in particular to two sections gas nitriding methods in surface of a kind of aluminium and aluminium alloy.
Background technology
Particularly the application of automobile industry is very extensive at engineering structure and manufacture for aluminium and aluminium alloy, because it is high that they have specific tenacity, proportion is little, under the prerequisite that does not reduce safety and stability, can alleviate the weight of engineering structure and machine, aluminium and aluminium alloy also have good machinability simultaneously.But along with the development of industrial technology, the hardness that aluminium and aluminium alloy are lower, lower wear resistance and solidity to corrosion make its requirement of the high harsh service conditions such as relative movement, high-quality stream and high corrosion between the not competent member.
Aluminium and aluminum alloy surface strengthening means commonly used have at present: anodic oxidation (hard anodizing, differential arc oxidation), laser and electron beam alloyage, ion sputtering, the methods such as plating hard chromium on surface and some Combined Processing.But the oxide film that anodic oxidation (hard anodizing) forms easily produces thermal crack, has reduced anticorrosion ability, and difference of hardness is larger between aluminium and the oxidized aluminum alloy layer simultaneously, has ready conditions in heavily stressed load operation, the zone of oxidation obscission can occur.And other enhancement methods are all expensive, inadaptable batch production.
By aluminium and aluminium alloy are carried out nitriding treatment, the hardness and the wear resistance that improve aluminium and alloy thereof at aluminium surface formation high hardness aluminium nitride layer have more and more caused people's interest in recent years.
But because the chemical property of aluminium is very active, fine aluminium and aluminum alloy surface be the good natural oxide film of existence and stability all.According to Environmental Water content, the thickness of oxide film is the thickest to be reached about 0.1 μ m, seriously hindered the diffusion of nitrogen-atoms in the aluminum substrate, this also is the difficult point that aluminium and aluminium alloy are realized surface carburization, so it is generally acknowledged that traditional nitridation process is difficult to realize nitriding at aluminium and aluminum alloy surface.
At present main research and the aluminium and the aluminum alloy nitridation technique that adopt are the glow discharge plasma nitriding.
Conventional direct current glow discharge plasma nitridation technique generally adopts bipolar DC system, workpiece is negative electrode, vacuum vessel is anode, between cathode and anode, add volts DS, make gas glow discharge produce plasma body, to cathode-workpiece accelerated motion, with workpiece surface collision and infiltration surface, finish the process of nitriding under the outside biased effect of positive ion.
But this method usually need to be carried out pre-sputter to eliminate oxide film before nitriding.Simultaneous temperature is higher, have in addition reach 650 ℃, cause the aluminium alloy local melting and because the resistance of AlN is very high, when common direct current glow discharge nitriding, with thickening of AlN layer, be the sustain discharge process, must change processing parameter, thereby increase nitriding difficulty etc.
In order to obtain better nitriding result, a lot of research workers improve technique and device, the nitriding of enhancing plasma ion, laser induced plasma nitriding, ECR(electron cyclotron resonance have successively been proposed) microwave plasma nitriding, radio frequency (high frequency) plasma nitridation etc., but the common ground of the nitriding process of above-mentioned aluminium and aluminium alloy thereof is: equipment requirements and production cost are high, the difficult control of complicated operation, are difficult to obtain desirable uniformly nitride layer for large size and baroque workpiece.
Summary of the invention
The object of the invention is to overcome the deficiency of prior art, provide a kind of nitride layer evenly controlled, cost is low, and aluminium simple for process and aluminium alloy nitriding method.Described aluminium and two sections gas nitriding methods of aluminum alloy surface concrete steps are as follows:
1) removes surface film oxide
A. pre-treatment and clean aluminium and Al alloy parts;
B. for the first time soak zinc, under room temperature environment, will carry out soaking the first time zinc, time 50～70s in the described workpiece immersion zinc dipping solution through cleaning;
C. washing, water cleans the described workpiece after soaking zinc for the first time;
D. move back zinc, the described workpiece after washing is at room temperature immersed in the nitric acid HNO3 aqueous solution move back zinc;
E. for the second time soak zinc, under room temperature environment, will carry out soaking the second time zinc, time time 25～35s in the described workpiece immersion zinc dipping solution through moving back zinc;
F. washing dries up, and water cleans the described workpiece after soaking zinc for the second time and dries up or dry;
2) surfaces nitrided
A. exhaust: after will placing in the nitriding furnace through the described workpiece of above-mentioned removal surface film oxide, begin to pass into ammonia to get rid of furnace air, until ammonia dissociation rate is less than 10%;
B. heat up for the first time: make furnace temperature rise to 570 ~ 590 ℃, in temperature-rise period, reduce gradually ammonia flow, until ammonia dissociation rate reaches 30 ~ 45%;
C. first paragraph nitriding: keep 570 ~ 590 ℃ of furnace temperature, 5 ~ 20 hours, this process kept ammonia dissociation rate 15 ~ 25%;
D. heat up for the second time, after single-stage nitriding is finished, make furnace temperature rise to 620 ~ 640 ℃, reduce simultaneously ammonia flow, make the ammonia dissociation rate under this temperature reach 40 ~ 55%;
E. second segment nitriding: keep 620 ~ 640 ℃ of furnace temperature, 5 ~ 30 hours, this process kept ammonia dissociation rate 40 ~ 55%;
F. move back nitrogen, keep 620 ~ 640 ℃ of furnace temperature, reduce ammonia flow, cause ammonia dissociation rate to 70 ~ 80%, this state kept 1～2 hour.
Described zinc dipping solution is the proportion relation gained solution that dissolves following quality compound by 1 premium on currency,
Zinc oxide ZnO 10 ~ 30 g,
Sodium hydroxide NaOH 50 ~ 70g,
Seignette salt KNaC
4H
4O
650 ~ 90g.
The used nitric acid HNO3 of the zinc process of the moving back aqueous solution in the described removal surface film oxide step is the water of 1: 0.8～1: 1.1 volumetric ratio and the mixing solutions of nitric acid HNO3, and the time that described workpiece immerses in this solution is 6 ~ 12s.
Pre-treatment in the described removal surface film oxide step and cleaning workpiece surface comprise electrochemical deoiling, hot water wash, cold wash, acid etch and the washing carried out successively step by step.
In the described surfaces nitrided steps of exhausting, after described workpiece places in the nitriding furnace, stove is heated up, when furnace temperature rises to 300 ℃, begin to pass into ammonia.
Above-mentioned technical solution of the present invention produces following beneficial effect fruit:
1) through after soaking the zinc processing, can effectively eliminate aluminium and aluminum alloy surface dense oxidation film and stop it to form once again, be conducive to the infiltration of nitrogen-atoms;
2) gas carbruizing furance that adopts the ordinary gas nitridation stove maybe can carry out the nitriding processing just can be realized aluminium and aluminum alloy nitridation, and the nitriding equipment requirements is not high, and production cost is low, and operation is simple;
3) wide adaptability can be processed the workpiece of different shape and size;
4) quality layer is good, and the workpiece all surface can obtain the aluminium nitride compound layer of even thickness.
Embodiment
The invention will be further described below in conjunction with specific embodiment.
Following embodiment carries out at the RQ3-35-9 gas carbruizing furance.
Embodiment 1
Workpiece material is 1050 fine aluminiums, and its chemical composition is aluminium Al 99.50%, Si0.25%, Cu0.05%, Mg0.05%, and other has minute quantity Zn, Mn etc.At first this fine aluminium workpiece is removed surface film oxide and processes, specifically finished by following step:
1) pre-treatment is carried out electrochemical deoiling, hot water wash, cold wash, acid etch and washing successively to the fine aluminium workpiece surface, and wherein electrochemical deoiling, acid etch are processed according to existing general industry surface of pure aluminum treatment process, repeat no more.
2) soak zinc for the first time, prepare first zinc dipping solution, the proportion relation that dissolves following quality compound by 1 premium on currency is prepared:
Zinc oxide ZnO 10 g,
Sodium hydroxide NaOH 50g,
Seignette salt KNaC
4H
4O
650g,
(5～35 ℃, following identical) immerse above-mentioned workpiece through cleaning in the zinc dipping solution for preparing and carry out soaking the first time zinc under room temperature environment, immerse time 50s.
3) washing, water cleans the described workpiece after soaking zinc for the first time.
4) move back zinc, prepare first dezincifying solution, prepare by the volumetric ratio 1:1 of water and nitric acid HNO3, above-mentioned workpiece after washing is immersed in the dezincifying solution, move back zinc, temperature is room temperature, and the immersion time is 6s.
5) soak zinc for the second time, under room temperature environment, will carry out soaking the second time zinc, time 25s in the workpiece immersion zinc dipping solution through moving back zinc; For the second time zinc dipping solution is with zinc dipping solution is identical for the first time, and the shared same groove solution of the present embodiment.
6) washing dries up, and water cleans the workpiece after soaking zinc for the second time and dries up.
The zone of oxidation of workpiece surface densification is removed, obtains one deck zinc tectum as thin as a wafer on the aluminum metal surface, produce with the oxide film that prevents aluminium.Then workpiece surface is carried out nitriding treatment, is specifically finished by following step:
1) exhaust: open first bell, build bell after will placing through the workpiece of above-mentioned removal surface film oxide in the described nitriding furnace, stove is heated up, when rising to 300 ℃, furnace temperature begins to pass into ammonia, be used for getting rid of oxygen in the stove by the oxygen in ammonia and the furnace air, furnace air is got rid of situation and can be obtained by the monitoring ammonia dissociation rate, and the fewer ammonia dissociation rate of furnace air is less, otherwise ammonia dissociation rate is larger.The ammonia dissociation rate of the present embodiment is controlled at below 10%, and ammonia dissociation rate control is realized by the control ammonia flow.
2) heat up for the first time: make furnace temperature rise to 570 ℃, in temperature-rise period, reduce gradually ammonia flow, ammonia dissociation rate is controlled at 15%.
3) first paragraph nitriding: keep 570 ℃ of furnace temperature, 5 hours, this process kept ammonia dissociation rate 15%.
4) heat up for the second time: after single-stage nitriding is finished, make furnace temperature rise to 620 ℃, reduce simultaneously ammonia flow, make the ammonia dissociation rate under this temperature reach 40%;
5) second segment nitriding: keep 620 ℃ of furnace temperature, 5 hours, this process kept ammonia dissociation rate 40%;
6) move back nitrogen, keep 620 ℃ of furnace temperature, reduce ammonia flow, cause ammonia dissociation rate to 70%, this state kept 1 hour.
Above-mentioned steps is finished dealing with the surfaces nitrided of workpiece, turn off the stove power supply, make the workpiece furnace cooling, should keep furnace pressure in this process is malleation, when furnace is reduced to 150 ℃, open fire door and take out workpiece, recording depth of penetration is 8 μ m, and the workpiece surface microhardness is 64.5HV0.1.
Embodiment 2
Workpiece material is 5050 aluminium alloys, and its chemical composition and content (wt%) are: Si0.4, Fe0.7, Cu0.2, Mn1.1, Mg1.4, Zn0.25, other 0.15, surplus is aluminium.At first this Al alloy parts is removed surface film oxide and processes, specifically finished by following step:
1) pre-treatment is carried out electrochemical deoiling, hot water wash, cold wash, acid etch and washing successively to the Al alloy parts surface, and wherein electrochemical deoiling, acid etch are processed according to existing general industry surface of pure aluminum treatment process, repeat no more.
2) soak zinc for the first time, prepare first zinc dipping solution, the proportion relation that dissolves following quality compound by 1 premium on currency is prepared:
Zinc oxide ZnO 20 g,
Sodium hydroxide NaOH 60g,
Seignette salt KNaC
4H
4O
670g,
Carry out soaking the first time zinc in the zinc dipping solution that under room temperature environment, above-mentioned workpiece immersion through cleaning is prepared, immerse time 60s.
3) washing, water cleans the described workpiece after soaking zinc for the first time.
4) move back zinc, prepare first dezincifying solution, prepare by the volumetric ratio 1:1.1 of water and nitric acid HNO3, above-mentioned workpiece after washing is immersed in the dezincifying solution, move back zinc, temperature is room temperature, and the immersion time is 10s.
5) soak zinc for the second time, under room temperature environment, will carry out soaking the second time zinc, time 30s in the workpiece immersion zinc dipping solution through moving back zinc; For the second time zinc dipping solution is with zinc dipping solution is identical for the first time, and the shared same groove solution of the present embodiment.
6) washing dries up, and water cleans workpiece and the oven dry after soaking zinc for the second time.
The zone of oxidation of workpiece surface densification is removed, obtains one deck zinc tectum as thin as a wafer on the aluminum metal surface, produce with the oxide film that prevents aluminium.Then workpiece is carried out the surface carries out nitriding treatment, is specifically finished by following step:
1) exhaust: open first bell, build bell after will placing through the workpiece of above-mentioned removal surface film oxide in the described nitriding furnace, stove is heated up, when rising to 300 ℃, furnace temperature begins to pass into ammonia, be used for getting rid of oxygen in the stove by the oxygen in ammonia and the furnace air, furnace air is got rid of situation and can be obtained by the monitoring ammonia dissociation rate, and the fewer ammonia dissociation rate of furnace air is less, otherwise ammonia dissociation rate is larger.The ammonia dissociation rate of the present embodiment is controlled at below 10%, and ammonia dissociation rate control is realized by the control ammonia flow.
2) heat up for the first time: make furnace temperature rise to 575 ℃, in temperature-rise period, reduce gradually ammonia flow, ammonia dissociation rate is controlled at 20%.
3) first paragraph nitriding: keep 575 ℃ of furnace temperature, 10 hours, this process kept ammonia dissociation rate 20%.
4) heat up for the second time: after single-stage nitriding is finished, make furnace temperature rise to 630 ℃, reduce simultaneously ammonia flow, make the ammonia dissociation rate under this temperature reach 50%;
5) second segment nitriding: keep 630 ℃ of furnace temperature, 15 hours, this process kept ammonia dissociation rate 50%;
6) move back nitrogen, keep 630 ℃ of furnace temperature, reduce ammonia flow, cause ammonia dissociation rate to 75%, this state kept 1.5 hours.
Above-mentioned steps is finished dealing with the surfaces nitrided of workpiece, turns off the stove power supply, the workpiece furnace cooling, should keep furnace pressure in this process is malleation, when furnace is reduced to 170 ℃, opens fire door and takes out workpiece, recording depth of penetration is 25 μ m, and the workpiece surface microhardness is 238HV0.1.
Embodiment 3
Workpiece material is the 2A12 aluminium alloy, and its chemical composition and content (wt%) are: Cu4.3, Mg1.6, Mn0.6, Si0.4, surplus are aluminium.At first this Al alloy parts is removed surface film oxide and processes, specifically finished by following step:
1) pre-treatment is carried out electrochemical deoiling, hot water wash, cold wash, acid etch and washing successively to the Al alloy parts surface, and wherein electrochemical deoiling, acid etch are processed according to existing general industry surface of pure aluminum treatment process, repeat no more.
2) soak zinc for the first time, prepare first zinc dipping solution, the proportion relation that dissolves following quality compound by 1 premium on currency is prepared:
Zinc oxide ZnO 30 g,
Sodium hydroxide NaOH 70g,
Seignette salt KNaC
4H
4O
690g,
Carry out soaking the first time zinc in the zinc dipping solution that under room temperature environment, above-mentioned workpiece immersion through cleaning is prepared, immerse time 70s.
3) washing, water cleans the described workpiece after soaking zinc for the first time.
4) move back zinc, prepare first dezincifying solution, prepare by the volumetric ratio 1:0.8 of water and nitric acid HNO3, above-mentioned workpiece after washing is immersed in the dezincifying solution, move back zinc, temperature is room temperature, and the immersion time is 12s.
5) soak zinc for the second time, under room temperature environment, will carry out soaking the second time zinc, time 35s in the workpiece immersion zinc dipping solution through moving back zinc; For the second time zinc dipping solution is with zinc dipping solution is identical for the first time, and the shared same groove solution of the present embodiment.
6) washing dries up, and water cleans the workpiece after soaking zinc for the second time and dries up.
The zone of oxidation of workpiece surface densification is removed, obtains one deck zinc tectum as thin as a wafer on the aluminum metal surface, produce with the oxide film that prevents aluminium.Then workpiece is carried out the surface carries out nitriding treatment, is specifically finished by following step:
1) exhaust: open first bell, build bell after will placing through the workpiece of above-mentioned removal surface film oxide in the described nitriding furnace, stove is heated up, when rising to 300 ℃, furnace temperature begins to pass into ammonia, be used for getting rid of oxygen in the stove by the oxygen in ammonia and the furnace air, furnace air is got rid of situation and can be obtained by the monitoring ammonia dissociation rate, and the fewer ammonia dissociation rate of furnace air is less, otherwise ammonia dissociation rate is larger.The ammonia dissociation rate of the present embodiment is controlled at below 10%, and ammonia dissociation rate control is realized by the control ammonia flow.
2) heat up for the first time: make furnace temperature rise to 590 ℃, in temperature-rise period, reduce gradually ammonia flow, ammonia dissociation rate is controlled at 25%.
3) first paragraph nitriding: keep 590 ℃ of furnace temperature, 20 hours, this process kept ammonia dissociation rate 25%.
4) heat up for the second time: after single-stage nitriding is finished, make furnace temperature rise to 640 ℃, reduce simultaneously ammonia flow, make the ammonia dissociation rate under this temperature reach 50%;
5) second segment nitriding: keep 640 ℃ of furnace temperature, 30 hours, this process kept ammonia dissociation rate 55%;
4) move back nitrogen, keep 640 ℃ of furnace temperature, reduce ammonia flow, cause ammonia dissociation rate to 80%, this state kept 2 hours.
Above-mentioned steps is finished dealing with the surfaces nitrided of workpiece, turn off the stove power supply, make the workpiece furnace cooling, should keep furnace pressure in this process is malleation, when furnace is reduced to 150 ℃, open fire door and take out workpiece, recording depth of penetration is 35 μ m, and the workpiece surface microhardness is 337HV0.1.
The present invention never is confined to above-described embodiment, goes out more embodiment in conjunction with the state of the art means are capable of being combined again according to technical scheme of the present invention, and these all fall into the scope that the present invention wants the resist technology scheme.The used cementing furnace of the present invention also is not limited to the described RQ3-35-9 gas carbruizing furance of above-described embodiment in addition, and other types of gases nitriding furnace or gas carbruizing furance can be implemented by described step and the processing condition of above-described embodiment equally.
Claims (5)
1. two sections gas nitriding methods of aluminium and aluminum alloy surface comprise the steps:
1) removes surface film oxide
A. pre-treatment and clean aluminium and Al alloy parts;
B. for the first time soak zinc, under room temperature environment, will carry out soaking the first time zinc, time 50～70s in the described workpiece immersion zinc dipping solution through cleaning;
C. washing, water cleans the described workpiece after soaking zinc for the first time;
D. move back zinc, the described workpiece after washing is at room temperature immersed in the nitric acid HNO3 aqueous solution move back zinc;
E. for the second time soak zinc, under room temperature environment, will carry out soaking the second time zinc, time time 25～35s in the described workpiece immersion zinc dipping solution through moving back zinc;
F. washing dries up, and water cleans the described workpiece after soaking zinc for the second time and dries up or dry;
2) surfaces nitrided
A. exhaust: after will placing in the nitriding furnace through the described workpiece of above-mentioned removal surface film oxide, begin to pass into ammonia to get rid of furnace air, until ammonia dissociation rate is less than 10%;
B. heat up for the first time: make furnace temperature rise to 570 ~ 590 ℃, in temperature-rise period, reduce gradually ammonia flow, until ammonia dissociation rate reaches 30 ~ 45%;
C. first paragraph nitriding: keep 570 ~ 590 ℃ of furnace temperature, 5 ~ 20 hours, this process kept ammonia dissociation rate 15 ~ 25%;
D. heat up for the second time, after single-stage nitriding is finished, make furnace temperature rise to 620 ~ 640 ℃, reduce simultaneously ammonia flow, make the ammonia dissociation rate under this temperature reach 40 ~ 55%;
E. second segment nitriding: keep 620 ~ 640 ℃ of furnace temperature, 5 ~ 30 hours, this process kept ammonia dissociation rate 40 ~ 55%;
F. move back nitrogen, keep 620 ~ 640 ℃ of furnace temperature, reduce ammonia flow, cause ammonia dissociation rate to 70 ~ 80%, this state kept 1～2 hour.
2. two sections gas nitriding methods of aluminium according to claim 1 and aluminum alloy surface is characterized in that described zinc dipping solution is the proportion relation gained solution that dissolves following quality compound by 1 premium on currency,
Zinc oxide ZnO 10 ~ 30 g,
Sodium hydroxide NaOH 50 ~ 70g,
Seignette salt KNaC
4H
4O
650 ~ 90g.
3. two sections gas nitriding methods of aluminium according to claim 1 and aluminum alloy surface, it is characterized in that the used nitric acid HNO3 of the zinc process of the moving back aqueous solution in the described removal surface film oxide step is the water of 1: 0.8～1: 1.1 volumetric ratio and the mixing solutions of nitric acid HNO3, the time that described workpiece immerses in this solution is 6 ~ 12s.
4. two sections gas nitriding methods of aluminium according to claim 1 and aluminum alloy surface is characterized in that preprocessing process in the described removal surface film oxide step comprises electrochemical deoiling, hot water wash, cold wash, acid etch and the washing carried out successively step by step.
5. the nitriding method of aluminium according to claim 1 and aluminum alloy surface is characterized in that in the described surfaces nitrided steps of exhausting, after described workpiece places in the nitriding furnace, stove is heated up, and begins to pass into ammonia when furnace temperature rises to 300 ℃.
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| CN105887000A (en) * | 2016-06-08 | 2016-08-24 | 连云港江南精工机械有限公司 | Nitriding heat treatment method of die-casting machine accessory |
| CN109536762A (en) * | 2018-12-04 | 2019-03-29 | 舒城久联精密机械有限公司 | A kind of preparation method of Precision Machining lathe tool high-strength alloy |
| CN110423977A (en) * | 2019-09-05 | 2019-11-08 | 合肥工业大学 | One kind is with electroless plated iron for pretreated aluminum material gas nitriding process |
| CN114875353A (en) * | 2022-04-27 | 2022-08-09 | 宁波同创强磁材料有限公司 | Preparation method of high-corrosion-resistance sintered neodymium-iron-boron magnet |
| CN115505865A (en) * | 2022-09-26 | 2022-12-23 | 沈阳飞机工业（集团）有限公司 | Hook-shaped part local nitriding heat treatment fixture and method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105887000A (en) * | 2016-06-08 | 2016-08-24 | 连云港江南精工机械有限公司 | Nitriding heat treatment method of die-casting machine accessory |
| CN109536762A (en) * | 2018-12-04 | 2019-03-29 | 舒城久联精密机械有限公司 | A kind of preparation method of Precision Machining lathe tool high-strength alloy |
| CN110423977A (en) * | 2019-09-05 | 2019-11-08 | 合肥工业大学 | One kind is with electroless plated iron for pretreated aluminum material gas nitriding process |
| CN114875353A (en) * | 2022-04-27 | 2022-08-09 | 宁波同创强磁材料有限公司 | Preparation method of high-corrosion-resistance sintered neodymium-iron-boron magnet |
| CN114875353B (en) * | 2022-04-27 | 2024-03-19 | 宁波同创强磁材料有限公司 | Preparation method of high-corrosion-resistance sintered NdFeB magnet |
| CN115505865A (en) * | 2022-09-26 | 2022-12-23 | 沈阳飞机工业（集团）有限公司 | Hook-shaped part local nitriding heat treatment fixture and method thereof |
| CN115505865B (en) * | 2022-09-26 | 2024-01-23 | 沈阳飞机工业（集团）有限公司 | Hook-type part local nitriding heat treatment clamp and method thereof |
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