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Preparation method for high-volume-fraction SiC reinforced Al-base composite material

A high volume fraction, composite material technology, applied in the field of preparation of SiC particle reinforced Al-based composite materials, can solve the problems of poor uniformity of structure, difficult production of complex parts, high equipment cost, etc., to achieve improved interface bonding performance, low production cost, The effect of improving mechanical properties

Active Publication Date: 2017-07-04
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Among the above-mentioned methods, the squeeze casting method is prone to gas or inclusions, and has many defects. It needs to be reinforced and preformed into a preform. The preform has a great impact on product quality, and the cost of the mold is high. tougher
The vacuum pressure infiltration method requires special equipment to provide high pressure and vacuum, the equipment cost is high, and it is difficult to precisely control its volume fraction
Compared with other methods, SiC reinforced A1 matrix composites prepared by powder metallurgy have the advantages of accurate composition ratio, uniform distribution of reinforcement in A1 matrix, and low sintering temperature, but the preparation process needs to be sintered under the protection of rare gas , the viscosity of the A1 liquid is relatively high, the gas is difficult to discharge, and more pores are produced after sintering; in addition, the sintering time is long, and various unfavorable interface reactions are prone to occur, which makes the interface bonding state of the prepared SiC reinforced A1-based composite material poor. 1. The uniformity of the structure is poor. Even if it is processed twice, the pores are still not easy to eliminate in the subsequent processing process, and the interface bonding state is difficult to be effectively improved, resulting in high porosity and poor mechanical properties of the prepared SiC reinforced A1-based composite material.
In addition, secondary processing makes the preparation cycle longer, process complexity and cost increase
These all restrict the large-scale application of SiC reinforced Al-based composites prepared by powder metallurgy

Method used

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  • Preparation method for high-volume-fraction SiC reinforced Al-base composite material
  • Preparation method for high-volume-fraction SiC reinforced Al-base composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] 1. Oxidation treatment of SiC powder:

[0047] Put the SiC powder (particle sizes of 600 mesh, 300 mesh, and 150 mesh respectively, according to the mass ratio of 1:1:2) in a high-temperature electric furnace, and oxidize it at 1100 ° C for 2 hours to form a layer of dense SiO on the surface. 2 Floor.

[0048] 2. TiO2 2 Sol preparation:

[0049] Water and alcohol are configured into a mixed solution according to a mass ratio of 1:9, wherein the quality of water is 5g, adding glacial acetic acid (CH 3 COOH) to adjust the pH value to 2, wherein 12g of the mixed solution was taken, and butyl titanate (C 16 h 36 o 4 Ti) and the mixed solution were mixed at a mass ratio of 6:1, heated in a water bath (30°C) and stirred for 2 hours to obtain a transparent and stable TiO 2 Sol.

[0050] 3. SiC powder surface coating: TiO 2 The mixed sol and PVB were added to the oxidized SiC powder according to 10% of the mass of the added SiC powder, and mixed with a KNM type fast gri...

Embodiment 2

[0061] 1. Oxidation treatment of SiC powder:

[0062] Put the SiC powder (particle sizes of 600 mesh, 300 mesh, and 150 mesh respectively, according to the mass ratio of 1:1.2:2.4 ingredients) in a high-temperature electric furnace, and oxidize it at 1200 ° C for 3 hours to form a dense layer of SiO on the surface. 2 Floor.

[0063] 2. TiO2 2 Sol preparation:

[0064] Water and alcohol are configured into a mixed solution according to a mass ratio of 1:11, wherein the quality of water is 8g, adding glacial acetic acid (CH 3 COOH) to adjust the pH value to 4, wherein 12g of the mixed solution was taken, and butyl titanate (C 16 h 36 o 4 Ti) and the mixed solution were mixed at a mass ratio of 9:1, heated in a water bath (40°C) and stirred for 4 hours to obtain a transparent and stable TiO 2 Sol.

[0065] 3. SiC powder surface coating: TiO 2 The mixed sol and PVB were added to the oxidized SiC powder according to 15% of the mass of the added SiC powder, and mixed with a ...

Embodiment 3

[0076] 1. Oxidation treatment of SiC powder:

[0077] Put the SiC powder (particle sizes of 600 mesh, 300 mesh, and 150 mesh respectively, according to the mass ratio of 1:1.1:2) in a high-temperature electric furnace, and oxidize it at 1200 ° C for 2 hours to form a layer of dense SiO on the surface. 2 Floor.

[0078] 2. TiO2 2 Sol preparation:

[0079] Water and alcohol are configured into a mixed solution according to the mass fraction of 1:10, wherein the quality of water is 8g, adding glacial acetic acid (CH 3 COOH) to adjust the pH value to 4, wherein 12g of the mixed solution was taken, and butyl titanate (C 16 h 36 o 4 Ti) and the mixed solution were mixed at a ratio of 7:1, heated in a water bath (40°C) and stirred for 2 hours to obtain a transparent and stable TiO 2 Sol.

[0080] 3. SiC powder surface coating: TiO 2 The mixed sol and PVB were added to the oxidized SiC powder according to 12% of the mass of the added SiC powder, and mixed with a KNM type fast ...

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Abstract

The invention discloses a preparation method for a high-volume-fraction SiC reinforced Al-base composite material. The preparation method comprises the steps of SiC powder oxidation treatment, TiO2 sol preparation, SiC powder surface coating, high-temperature calcination under a reducing atmosphere, mixing, forming, Ar atmosphere protection sintering and cooling. The preparation process is simple, the interface bonding between SiC particles and molten metal Al is effectively improved, an adverse interfacial reaction is avoided, the defect that the density is not high as a powder metallurgy method is adopted traditionally is overcome, and the finally prepared SiC particle reinforced Al-base composite material is excellent in performance, for example, the flexure strength ranges from 181.7 Mpa to 203.5 Mpa, the density ratio ranges from 91.0 % to 95.3 %, and the volume fraction is 56.5 %.

Description

technical field [0001] The invention relates to the field of metal-based composite materials, in particular to a method for preparing SiC particle-reinforced Al-based composite materials with a high volume fraction. Background technique [0002] Silicon carbide (SiC) has excellent properties such as high melting point, high mechanical strength, high thermal stability, good chemical stability, and low thermal expansion coefficient; Al has many outstanding advantages, such as good plasticity, light weight, and easy to master technology. It is easy to process, etc., and the high volume fraction SiC reinforced Al-based composite material prepared by combining the advantages of the two has high specific strength and specific stiffness, good high temperature performance, fatigue resistance and wear resistance, good damping performance, low thermal expansion coefficient, and high electrical conductivity. And other characteristics, it has become one of the most promising new structu...

Claims

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Application Information

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IPC IPC(8): C22C21/00C22C32/00C22C1/05C22C1/10
CPCC22C1/058C22C21/00C22C32/0063
Inventor 王浩杨小剑许建航
Owner WUHAN UNIV OF TECH
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