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Injection mold SiC ceramic preliminary shaping blank method for reinforcing metallic infiltration

An injection molding and infiltration technology, which is applied in the field of injection molding SiC ceramic preforms for strengthening metal infiltration, can solve problems such as poor thermal conductivity, affecting the thermal conductivity of the final composite material, and hindering heat transfer at the interface

Inactive Publication Date: 2010-06-02
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method has certain shortcomings, that is, the Al alloy matrix will interact with SiO during the infiltration process. 2 layer reacts to generate MgAl with poor thermal conductivity at the SiC / Al interface 2 o 4 Phase, which hinders the transfer of heat at the interface, thereby affecting the thermal conductivity of the final composite

Method used

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  • Injection mold SiC ceramic preliminary shaping blank method for reinforcing metallic infiltration
  • Injection mold SiC ceramic preliminary shaping blank method for reinforcing metallic infiltration

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0009] Example 1: Preparation of a preform with a strength of 4MPa and a SiC volume fraction of 67vol%

[0010] SiC powder with a particle size of 60 μm is mixed with a wax-based binder, the volume fraction of SiC is 67vol%, and the main component of the wax-based binder is 65wt% PW (paraffin) + 30wt% HDPE (high-density polyethylene) + 5wt % SA (stearic acid), granulate after obtaining uniform feeding, and then form parts of the required shape on the injection molding machine. After solvent degreasing the injection billet, the temperature was raised to 360°C at a heating rate of 5°C / min. At this time, part of the high-density polyethylene in the green body was not removed to maintain the strength of the green body. Under this condition, the strength of the green body still reaches 5MPa, which can meet the strength requirements of operations such as impregnation and dehydration hardening.

[0011] Put the green body that has been thermally degreased at 360°C into sodium water ...

Embodiment 2

[0012] Example 2: Preparation of a preform with a strength of 9MPa and a SiC volume fraction of 67vol%

[0013] SiC powder with a particle size of 60 μm is mixed with a wax-based binder, the volume fraction of SiC is 67vol%, and the main component of the wax-based binder is 65wt% PW (paraffin) + 30wt% PP (polypropylene) + 5wt% SA (stearic acid), granulate after obtaining uniform feeding, and then form parts of the required shape on the injection molding machine. After solvent degreasing the injection billet, the temperature was raised to 380°C at a heating rate of 5°C / min. At this time, part of the polypropylene in the green body was not removed to maintain the strength of the green body. Under this condition, the strength of the green body is close to 5MPa, which can meet the strength requirements of operations such as impregnation and dehydration hardening.

[0014] Put the green body that has been thermally degreased at 380°C into sodium water glass with a concentration of...

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Abstract

The invention belongs to the research field of metal matrix composite, providing a strengthening method for the injected shaped SiC ceramic preliminary bland through the infiltration of metal like Cuor Al, which is characterized by putting the SiC injected blank formed through the injection of a wax-based binder system into natrium water glass solution with the concentration of 0.8 percent to 1.2percent by weight and the modulus of 2.2 to 2.5 after solvent degreasing and partial thermal degreasing, uniformly impregnating and taking out to dry at the room temperature, and going on with the thermal degreasing until the left binder in the blank being eliminated completely before impregnation, and the degreasing process is divided into two processes, first, thermal degreasing, the temperature is controlled between 350 to 380 DEG C, the degreasing time is 0.5 to 2 hours, then impregnating and drying process is carried on, in the second degreasing process, the temperature is controlled between 550 to 600 DEG C, the degreasing time is 0.5 to 2 hours, in the process, the blank is increased to 4 MPa from the 0.2MPa which is carried out before the strengthening process so as to satisfy operating requirements better, the method can not only strengthen the intensity of the blank effectively but also has comparatively less foreign substances, which has no obvious influence on the properties of the finally produced composite materials.

Description

technical field [0001] The invention belongs to the research field of metal matrix composite materials, and relates to a method for strengthening metal infiltration and injection molding SiC ceramic preform. Background technique [0002] High volume fraction SiCp / Al or SiCp / Cu composite material has excellent thermophysical properties such as high thermal conductivity, low thermal expansion coefficient and high specific modulus, and is an ideal electronic packaging material. However, the high hardness, high brittleness and other characteristics of this material make it difficult to process it into a device with a desired shape by secondary machining, which greatly limits the wide use of this material. Therefore, it is very necessary to develop a near-net-shape process for this material. At present, the near-net shape process widely used at home and abroad is the liquid metal infiltration method, which is to first prepare the porous reinforced phase ceramic body with the fin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/565C04B35/634C04B35/638
Inventor 任淑彬曲选辉何新波沈晓宇秦明礼段柏华汤春锋
Owner UNIV OF SCI & TECH BEIJING