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A kind of stainless steel reinforced aluminum silicon carbide composite material 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, can solve problems such as the decrease of thermal conductivity of materials, and achieve the effects of maintaining high temperature expansion stability, improving strength and good compatibility.

Active Publication Date: 2022-08-09
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] The present embodiment relates to a preparation method of a stainless steel reinforced aluminum silicon carbide composite material, and the steps are as follows:

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

[0040] (2) A certain amount of polyoxymethylene is added to the mixed powder, and dry pressing is performed to obtain a silicon carbide blank. The added amount of polyoxymethylene controls the porosity in the porous silicon carbide body after sintering to reach 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) The porous silicon carbide blank is immersed in molten aluminum liquid at 1000°C, and kept for 2 hours to obtain an aluminum silicon carbide blank;

[0043] (5) Put the blank into the grinding...

Embodiment 2

[0045] The present embodiment relates to a preparation method of a stainless steel reinforced aluminum silicon carbide composite material, and the steps are as follows:

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

[0047] (2) adding a certain amount of epoxy resin to the mixed powder, and performing injection molding to obtain a silicon carbide blank. The added amount of polyoxymethylene controls the porosity in the porous silicon carbide body after sintering to reach a preset range. Wherein, the master batch for injection molding is granulated according to the following method: Step 1: Metal material granulation: put stainless steel powder and 1 / 2 of the polyoxymethylene into the internal mixer, mix for 2 hours, then extrude and cut into pellets to obtain Metal material particles; step 2: granulation of silicon carbide composite ceramic materia...

Embodiment 3

[0052] In this example, on the basis of Example 1, the content of 316L stainless steel powder is adjusted to 5%. See Example 1 for other operations and steps.

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Abstract

The invention relates to a preparation method of a stainless steel reinforced aluminum silicon carbide composite material, comprising the following steps: S1, powder mixing: mixing 5-20% stainless steel powder and 80-95% silicon carbide powder uniformly in proportion; S2, blank Body molding: a certain amount of pore-forming agent is mixed into the mixed powder of S1 to form a green body; S3, green body sintering: under inert atmosphere protection or vacuum conditions, the green body is sintered at 1350-1600 ℃ to obtain porous carbonization Silicon body; S4, aluminum melt infiltration: the surface of the porous silicon carbide body is infiltrated with aluminum melt, and the aluminum silicon carbide blank; S5, the aluminum silicon carbide blank is machined and repaired. The invention is used to solve the technical problem that thick silicon dioxide is formed on the surface of the silicon carbide preform due to oxidative sintering in the prior art process, thereby causing the thermal conductivity of the material to decrease, and at the same time, the bending strength of the material is improved.

Description

technical field [0001] The invention relates to the technical field of metal ceramic 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 lightweight, 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 a silicon carbide preform, sintered in an oxygen-containing atmosphere to obtain a porous silicon carbide preform, and then infiltrated with an 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 into a colloid for granulation, applying a set pressure and temperature to the granulated powder by mea...

Claims

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Application Information

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Patent Type & Authority Patents(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