JPS5942703A - Insulative thermal conductor and method of producing same - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a heat sink conductor suitable for heat sinking and a method for manufacturing the same.

Conventionally, ferrite, -ceramic, etc. have been made into a sintered body by applying a binder with side resin (for example, polyvinyl alcohol), compression molding the powder, and firing. The method for manufacturing such ferrites, ceramics, etc. is unchanged from the conventional method, and by using binder such as polyvinyl alcohol, [-
However, it has a number of drawbacks, such as a complicated process and a relatively high temperature for sintering. In addition, when used in heat sinks, heat dissipation containers, etc., thermal properties, especially thermal conductivity, are an issue, but ferrite, ceramics, etc. originally required heat conduction.

On the other hand, when it comes to applications such as heat sinks and heat dissipation containers, metals have good thermal conductivity, but they have the problem of being difficult to use because of electrical conductivity and Illo.

In view of the points in )-, the present invention provides heat f conduction with L and insulation = l.
'14 and j;z(liit and p1nk,
It is an object of the present invention to provide an insulating body suitable for use in a heat dissipation container M-1) and a method for manufacturing the same. .

The insulating and heat-resistant (1) special wood according to the present invention forms an insulating thin layer of oxide or the like on the surface of the metal powder, and then connects the glass and metal oxide layer into the connection h'l. i′Ik '1 roto is 1, n sign.

In addition, the method for producing insulation and 1?1 good thermal conductivity wood of the present invention is as follows:
The surface of the metal powder I4-1 as shown in Figure 1 (l\) is insulated by forming an insulating thin layer such as an oxide 'tW layer as shown in Figure 1 (13). , as shown in the same figure ((:). The mixing process consists of a step L in which the mixture is molded into a predetermined shape, and an exothermal step in which the molded product is heated and stirred to a solid state.However,
Heat treatment is about 1゜ lower than suitable sintering! :11! T-line
)1. This is because the sintering of Kotsu makes the temperature of +5 degrees too high, and the plain metal wood melts in the curve that connects the insulation A layers. .

Below, insulation good heat 1 according to the present invention! , the wood and the method for producing the same will be explained in detail by way of examples.

ζExample 1 Al2 on the surface of aluminum powder with an average particle size of 50μ
Form a thin insulating layer of 0- and alumina 11 powder 4,,'
71H, as a linking agent, floid-like silica (30% by weight of 810° particles with a particle diameter of 1.
, viscosity 6 minus 1 s) was added at a rate of 2 cc, kneaded and granulated, and pressed at a pressure of 1.S Lon/can2.
It was baked at +1'C for about 2 hours. The solidified molded body is an insulator with electrical conductivity (105 to 10Ωc111), but has extremely high thermal conductivity (1-10W/In-K) and density (2, It was lightweight at 136/cc).

Example 2 An insulating thin layer of iron oxide was formed on the surface of carbonyl iron powder, and colloidal silica (particle size: 1', l''2 in aqueous solution) was added to 2 g of carbonyl iron powder as a coupling agent.
It contains 30% by weight of SiO2 of 0 Illμ, density 1.211, viscosity Gc: 1+s) of 20e
Add C in proportion, knead, and make! ζ! After that, the press was completed. Then, the 111 molded 1j, S, 1 piece was fired for about 2 hours at G 11 fl T,', and the solidified molded 1j, S, conductivity (1 + E' - I +
1' Ωf: Ill ) and a high-resistance element ', -no heat (jk conductivity force (1-1t1~'/+n ・K I do J
(I entered B, and the density was (4+;/+・(:)), which was light tii.

Third, instead of forming a thin oxide layer on the metal powder, an insulation layer 71 may be formed using an insulating and heat-resistant coating.

Further, as a coupling agent, a low melting point glass may be used in place of colloidal silica and may be subjected to forceful glass melting. Furthermore, in the case of two cases, a metal is used as a linking agent, and in the case of two cases, a public alkoxy group is used. etc. can be separated by heat treatment, leaving a fine amount of metal additives (metal oxides, carbides) between the metal powders. It is also conceivable to make a compound ratio between the metal powder and the metal powder.

1. Based on Examples 1 and 2) i: Insulated insulation 1.Good heat 1! ; Guide wood has the following features ↓
- Good quality.

(2) Electrical resistance is high, with a specific resistance of several 1 (ΩII+ or higher).

(3) Thermal conductivity is better than ceramics, etc.

('l)I! It has sufficient repellent strength and is lighter than metal.

(5) By preparing it as a kneaded wood in the form of a base, it can be made into a material with good thermal conductivity and insulation properties.

The second feature of the manufacturing method is that it is easy to mold, and can be extruded and formed into a honeycomb shape or a linear shape.

The uses of the insulating good thermal conductor according to the present invention are as follows! ￥S
There is a heat sink 11 to which the power transistor 10 is mounted as shown in FIG. 2, a second 1C package 12 as shown in the figure, or a terminal plate 13 to which heat is applied from a transformer, motor, etc. as shown in FIG.

As explained below-1-, according to the present invention, it is possible to obtain an insulating good thermal conductor that has both thermal conductivity and insulation properties and is suitable for use in heat sinks, heat dissipation containers, etc. The effect of Real Jr. Month 2 is extremely strong.

... [Simplification of 1 drawing 1) 2 conditions Figure 1 ()\), (1), ((D) is an explanatory diagram showing a part of the manufacturing step I of the present invention, Figure 2 is an illustration of the present invention. This is an example of the use of the insulating good heat fj; guide wood according to the invention. Figure 1 shows the case where the end J' root is formed by (Nj!1: Figure 1).

1... Metal powder book, 2... Absolute # & thin layer, J (... Connecting agent,.

Special 3'1 Applicant: Toto Electric Co., Ltd.
1;; [Figure 1

Claims (1)

[Claims] (1) Insulation made of metal powder or a coupling agent having an absolute layer on the surface; 1-1 good thermal insulation;
c. (2) The insulating thin layer described in 1iii, or the acid-monomer thin layer of the metal powder described in 1jii, and at least the coupling agent or the metal powder described in 1iii, and the metal acid. Range No. 1 Insulation 111. Good thermal conductor. ”
l:j i1; u's absolute H-do 1° good heat f-ba guide tree. (4) Insulating iv layer formed on the surface of the metal powder book, then kneaded with a coupling agent, further formed into a certain shape, heated and solidified. Method of manufacturing conductors. (5) The above-mentioned O-color H thin 1 bitter or 1 iif recording gold hj shank 1 acid 1 hi 6-4 te and the above-mentioned coupling agent are Freud's-like 1? 1,'f Claims No. 1 using oxides of
Item 1 Ji! Insulation of Q-t! l: good heat fl; manufacturing method of conductor.