High-volume fraction B4C and Si particle mixing enhancement aluminum-based composite material and preparation process thereof

An aluminum-based composite material with a high volume fraction technology, applied in the field of aerospace materials, can solve the problems of not meeting the high-performance requirements of aerospace light-weight, high-strength structural functional parts, and low comprehensive performance of materials, and achieve high strength, low equipment requirements, and high heat. The effect of conductivity

Active Publication Date: 2017-06-09
有研金属复材技术有限公司
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AI Technical Summary

Problems solved by technology

This is mainly because the traditional powder metallurgy hot pressing sintering process is difficult to achieve high volume B 4 The densification of C / Al composite materials leads to low comprehensive performance of the material, which cannot meet the high performance requirements of aerospace lightweight and high-strength structural functional parts

Method used

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  • High-volume fraction B4C and Si particle mixing enhancement aluminum-based composite material and preparation process thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The volume fraction of the composite material is: B 4 The C content is 55vol.%, the Si content is 5vol.%, and the Al-Cu-Mg-Co matrix content is 40vol.%. Above B 4 The particle size of C is 11μm, the particle size of Al powder is 20μm, the particle size of Cu powder is 10μm, the particle size of Mg powder is 25μm, and the particle size of Co powder is 3μm. First of all to B 4 The C and Si particles are pre-oxidized and dried separately, and the powder with the nominal composition of Al-3.5Cu-1.0Mg-0.5Co is configured, and then 55vol.% B 4 C. The mixed powder of 5vol.% Si and 40vol.% Al-3.5Cu-1.0Mg-0.5Co is mixed by ball milling, the ball mill speed is 100 rpm, the ball milling time is 20 hours, and the ball-to-material ratio is 2:1; the mixed powder After sieving, the cold isostatic pressing rubber sleeve is installed, and the cold isostatic pressing is formed after sealing. The cold isostatic pressing pressure is 120MPa, and the pressing time is 20 minutes; the cold isost...

Embodiment 2

[0030] The volume fraction of the composite material is: B 4 The C content is 55 vol.%, the Si content is 10 vol.%, and the Al-Cu-Mg-Co matrix content is 35 vol.%. Above B 4 The particle size of C is 11μm, the particle size of Al powder is 20μm, the particle size of Cu powder is 10μm, the particle size of Mg powder is 25μm, and the particle size of Co powder is 3μm. First of all to B 4 The C and Si particles are pre-oxidized and dried separately, and the powder with the nominal composition of Al-3.5Cu-1.0Mg-0.5Co is configured, and then 55vol.% B 4 C. 10vol.%Si and 40vol.%Al-3.5Cu-1.0Mg-0.5Co mixed powders are mixed by ball milling, the ball mill speed is 100 rpm, the ball milling time is 20h, and the ball-to-material ratio is 2:1; the mixed powder After sieving, the cold isostatic pressing rubber sleeve is installed, and the cold isostatic pressing is formed after sealing. The cold isostatic pressing pressure is 120MPa, and the pressing time is 20 minutes; the cold isostatic pr...

Embodiment 3

[0033] The volume fraction of the composite material is: B 4 The C content is 60vol.%, the Si content is 10vol.%, and the Al-Cu-Mg-Co matrix content is 30vol.%. Above B 4 The particle size of C is 11μm, the particle size of Al powder is 20μm, the particle size of Cu powder is 10μm, the particle size of Mg powder is 25μm, and the particle size of Co powder is 3μm. First, pre-oxidize and dry the B4C and Si particles respectively, configure the powder with the nominal composition of Al-3.5Cu-1.0Mg-0.5Co, and then add 55vol.% B 4 C, 10vol.% Si and 40vol.% Al-3.5Cu-1.0Mg-1.0 mixed powder mixed powder, ball mill speed 100 rpm, ball milling time 20h, ball to material ratio 2:1; pass the mixed powder After the sieve is put into the cold isostatic pressing rubber sheath, after sealing, the cold isostatic pressing is carried out, the cold isostatic pressing pressure is 120MPa, and the pressing time is 20 minutes; the cold isostatic pressing billet is vacuum degassed in the well-type resis...

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Abstract

The invention discloses a high-volume fraction B4C and Si particle mixing enhancement aluminum-based composite material and a preparation process thereof. The aluminum-based composite material is composed of an Al-Cu-Mg-Co alloy base body and a mixing enhancement phase of B4C and Si. By volume percent, the content of the Al-Cu-Mg-Co alloy base body is 30%-45%, the content of the B4C is 55%-60%, the content of the Si is a, and a is larger than zero and smaller than or equal to 10%. The aluminum-based composite material is prepared through a powder metallurgy method. The preparation process mainly comprises the steps of pretreatment of the B4C and Si particles, ball mill mixing of the enhancement phase and Al alloy base body powder, powder cold isostatic pressing, vacuum degassing, hot isostatic pressing and the like. The density of the aluminum-based composite material is 2.55-2.60 g / cm<3>, the bending strength is 450-530 MPa, the elastic modulus is 180-220 GPa, the thermal expansion coefficient is 7.6-9.5*10<-6>K<-1>, and the thermal conductivity is 70-100 W / m.K. The excellent performance of the aluminum-based composite material can well meet the using requirements of spaceflight light high-strength structure function part materials.

Description

Technical field [0001] The invention relates to a high volume fraction B 4 An aluminum-based composite material reinforced by mixing C and Si particles and a preparation process thereof belong to the technical field of aerospace materials. Background technique [0002] B 4 C has good physical, chemical and mechanical properties, nearly constant high temperature hardness, high elastic modulus (450~470GPa), high wear resistance, oxidation resistance, and good neutron absorption performance, low density (2.52g / cm 3 ) And other characteristics, play a great role in the fields of aerospace, electronic communications, cutting and grinding tools, and nuclear industry. Because B 4 C The above-mentioned excellent comprehensive performance, use it to strengthen the aluminum alloy matrix to prepare B 4 In the case of C / Al composite materials, the material can obtain excellent mechanical and physical properties such as low density, high specific strength and specific stiffness, low thermal e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/05C22C29/06
CPCC22C1/051C22C29/062
Inventor 聂俊辉樊建中张少明马自力魏少华左涛刘彦强赵月红杨必成郝心想
Owner 有研金属复材技术有限公司
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