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Stainless steel reinforced aluminum silicon carbide composite and preparation method thereof

A technology of aluminum silicon carbide and composite materials, which is applied in the field of stainless steel reinforced aluminum silicon carbide composite materials and its preparation, which can solve the problems of material thermal conductivity decline and achieve the effects of maintaining high temperature expansion stability, good compatibility, and improving strength

Active Publication Date: 2022-01-14
GUANGDONG REAL FAITH LIGHTING TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the above-mentioned shortcomings and deficiencies of the prior art, the present invention provides a stainless steel-reinforced aluminum-silicon carbide composite material, which is used to solve the problem of thick silicon dioxide formed on the surface due to the oxidative sintering of the silicon carbide preform in the prior art process. , which in turn leads to the technical problem that the thermal conductivity of the material decreases

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] This embodiment relates to a method for preparing a stainless steel reinforced aluminum silicon carbide composite material, the steps are as follows:

[0039] (1) Mix 10wt% 316L stainless steel powder (particle size 5-10um) with 90wt% silicon carbide (particle size 15um, 60um, 100um, 150um according to the mass ratio of 2:3:6:10).

[0040] (2) Add a certain amount of polyoxymethylene to the mixed powder, and perform dry pressing to obtain a silicon carbide blank. The amount of polyoxymethylene added controls the porosity in the sintered porous silicon carbide green body to a preset range.

[0041] (3) Vacuum sintering at 1450° C. for 120 minutes to obtain a porous silicon carbide body with a porosity of about 35% (volume fraction).

[0042] (4) Dip the porous silicon carbide blank into the molten aluminum at 1000°C and keep it warm for 2 hours to obtain the aluminum silicon carbide blank;

[0043] (5) Put the blank into the grinding machine, remove the excess aluminum...

Embodiment 2

[0045] This embodiment relates to a method for preparing a stainless steel reinforced aluminum silicon carbide composite material, the steps are as follows:

[0046](1) Mix 15wt% 304 stainless steel powder (particle size 5-10um) with 85wt% silicon carbide (particle size 15um, 60um, 150um according to the mass ratio of 2:6:12).

[0047] (2) Add a certain amount of epoxy resin to the mixed powder, and perform injection molding to obtain a silicon carbide blank. The amount of polyoxymethylene added controls the porosity in the sintered porous silicon carbide green body to a preset range. Among them, the masterbatch for injection molding is granulated according to the following method: Step 1: Metal material granulation: put stainless steel powder and 1 / 2 polyoxymethylene into the internal mixer, knead for 2 hours, then extrude and pelletize to obtain Metal material granules; step 2: granulation of silicon carbide composite ceramic material: Put silicon carbide powder and 1 / 2 pol...

Embodiment 3

[0052] This embodiment is based on embodiment 1, and the dosage of 316L stainless steel powder is adjusted to 5%. Refer to Example 1 for the remaining operations and steps.

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Abstract

The invention relates to a preparation method for a stainless steel reinforced aluminum silicon carbide composite. The preparation method comprises the following steps of S1, powder mixing, specifically, uniformly mixing 5-20% of stainless steel powder and 80-95% of silicon carbide powder in proportion; S2, green body forming, specifically, doping a certain amount of a pore-forming agent into the mixed powder obtained in the S1, and forming a green body; S3, green body sintering, specifically, sintering the green body at 1350-1600 DEG C under inert atmosphere protection or a vacuum condition to obtain a porous silicon carbide green body; S4, aluminum melt infiltration, specifically, infiltrating the surface of the porous silicon carbide blank with an aluminum melt to obtain an aluminum silicon carbide blank; and S5, machining and shaping the aluminum silicon carbide blank. The preparation method is used for solving the technical problem that due to oxidation sintering of the silicon carbide preform, relatively thick silicon dioxide is produced on the surface, and then the heat conductivity of the material is reduced in the prior art, and the bending strength of the material is improved at the same time.

Description

technical field [0001] The invention relates to the technical field of cermet composite materials, in particular to a stainless steel reinforced aluminum silicon carbide composite material and a preparation method thereof. Background technique [0002] Aluminum silicon carbide material is a light weight, low expansion, high strength, high thermal conductivity metal-ceramic composite material, which is widely used in chip packaging, heat conduction and heat dissipation of power electronic devices. The aluminum silicon carbide material is usually obtained by sintering the silicon carbide preform in an oxygen-containing atmosphere to obtain a porous silicon carbide preform, and then infiltrating the aluminum alloy melt. For example, CN113097153A discloses a method for preparing an aluminum silicon carbide heat sink substrate. The method is as follows: adding silicon carbide powder to the colloid for granulation, adopting a hot isostatic pressing method, applying a set pressure ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/05C22C1/10C22C29/06B22F3/11B22F3/24B22F3/26B22D23/04
CPCC22C1/051C22C29/065C22C29/067B22F3/1125B22F3/26B22F3/24B22D23/04B22F2003/247B22F2003/248
Inventor 陈凤艳杨光辉梁裕华
Owner GUANGDONG REAL FAITH LIGHTING TECH