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Porous SiC prefabricated product, its preparation method and ceramic-metal composite material

A technology of porous ceramics and preforms, which is applied in the field of porous ceramics, and can solve the problems of damage to porous ceramic preforms, poor bending strength, and reduced pass rate of ceramic-metal composite materials, etc.

Active Publication Date: 2016-04-27
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the porous ceramic preforms that can meet the above requirements generally have poor flexural strength, which leads to the composite process of the latter stage and aluminum must be formed in a relatively long period of time and at a relatively low pressure
It leads to low production efficiency of composite materials. Once the molding pressure is slightly higher, it may damage the porous ceramic preform and reduce the qualified rate of ceramic metal composite materials.

Method used

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  • Porous SiC prefabricated product, its preparation method and ceramic-metal composite material
  • Porous SiC prefabricated product, its preparation method and ceramic-metal composite material
  • Porous SiC prefabricated product, its preparation method and ceramic-metal composite material

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preparation example Construction

[0019] The aforementioned porous SiC preform provided by the present invention can be prepared by referring to conventional methods in the prior art. In a preferred embodiment of the present invention, a method for preparing a porous SiC preform comprises the following steps: mixing 100 parts by weight of SiC particle mixture, 0.1-5 parts by weight of Na 2 SiO 3 , 0.1-5 parts by weight of Al 2 o 3The particles are mixed with a binder, an optional curing agent, an optional auxiliary agent, and an optional solvent to obtain a raw material mixture; the raw material mixture is dry-pressed to obtain a green preform; the green preform is heated to the first temperature, keep warm for degumming treatment, and then heat to the second temperature to obtain a porous SiC preform, wherein the SiC particle mixture contains three groups of SiC particles with different particle sizes in the range of D50, and the particle size D50 of the second group of SiC particles is the same as that of ...

Embodiment 1 to 5

[0042] (1) Raw material ratio: as shown in Table 1:

[0043] Table 1

[0044]

[0045] (2) Preparation method of porous SiC preform:

[0046] The first group of SiC particles, the second group of SiC particles, the third group of SiC particles, Na 2 SiO 3 、Al 2 o 3 The particles were dry mixed for 2 hours to obtain mixture A;

[0047] Mix the binder, curing agent, auxiliary agent and solvent (one-time usage) for 1 hour to obtain mixture B;

[0048] The mixture B was added to the mixture A, and the solvent (secondary amount) was added for wet mixing for 5 hours to obtain the raw material mixture.

[0049] Dry the raw material mixture in an oven (40° C.) for 30 minutes, mold the dried raw material mixture in a dry press mold with a pressure of 100 MPa, and a molding holding time of 120 seconds to obtain a green preform;

[0050] Raise the temperature of the green preform to 600°C (first temperature) at a primary heating rate of 1°C / min and keep it warm for 1 hour; then...

Embodiment 6-7

[0056] (1) raw material proportioning: with embodiment 1.

[0057] (2) Preparation method of porous SiC preform: refer to Example 1, wherein the parameters of each step are shown in Table 3.

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Abstract

The invention discloses a porous SiC prefabricated product, its preparation method and a ceramic-metal composite material. The porous SiC prefabricated product comprises, by weight, 100 parts of a SiC particle mixture, 0.1-5 parts of Al2O3 particles and 0.1-5 parts of Na2SiO3. The SiC particle mixture contains three groups of SiC particles with different particle sizes D50, wherein the particle size D50 of the SiC particles in the second group is 2-600 times that of the SiC particles in the first group and the particle size D50 of the SiC particles in the third group is 2.5-6 times that of the SiC particles in the second group. Through use of Na2SiO3 and Al2O3 particles in the porous SiC prefabricated product and cooperation of the SiC particle mixture, Al2O3 particles and Na2SiO3 according to a specific ratio, porous SiC prefabricated product bending strength is improved.

Description

technical field [0001] The invention relates to the field of porous ceramics, in particular to a porous SiC prefabricated body, a preparation method thereof, and a ceramic-metal composite material. Background technique [0002] Modern electronic packaging materials require a high degree of expansion coefficient matching between packaging materials and silicon chips, high thermal conductivity, lightweight - low density, high stiffness, high modulus, and stable dimensions. Traditional packaging materials can no longer meet these requirements. For example, traditional aluminum and copper electronic packaging materials have excellent thermal conductivity, but their thermal expansion coefficient is much larger than that of chips. This makes their matching performance with electronic components very poor, and they cannot withstand the impact of thermal fatigue, reducing the life of electronic devices; aluminum and copper electronic packaging materials are also relatively soft, and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/565C04B35/622C04B38/00C22C29/06
Inventor 张伟峰林信平徐强邵长健
Owner BYD CO LTD
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