Method for regulating and controlling expansion coefficient of light compact near-zero expansion metal matrix composite material

Abstract

The invention provides a method for regulating and controlling the expansion coefficient of a light compact near-zero expansion metal matrix composite material, which comprises the steps of taking negative expansion material Mn3(MnxZnySnz)N powder and metal matrix powder as raw materials, wherein the metal matrix is selected from any one of pure aluminum, pure copper, aluminum alloy, magnesium alloy, titanium alloy and copper alloy; mixing the negative expansion material Mn3(MnxZnySnz)N powder with the metal matrix powder to obtain mixed powder; adjusting the ratio of the negative expansion material powder to the metal matrix powder, and / or adjusting the particle size of the negative expansion material Mn3(MnxZnySnz)N powder to obtain the light compact near-zero expansion metal matrix composite material, wherein the negative expansion material powder accounts for 1-50% of the total volume of the metal matrix composite material, the metal matrix powder accounts for 99-50% of the total volume of the metal matrix composite material, and the particle size of the negative expansion material Mn3(MnxZnySnz)N powder is adjusted within the range of less than 150 microns. By adjusting the particle size and content of the negative expansion material Mn3(MnxZnySnz)N powder, the thermal expansion coefficients (including zero expansion) of various metal matrix composite materials are regulated and controlled.

Description

technical field [0001] The invention relates to a lightweight near-zero-expansion composite material, in particular to a method for adjusting the expansion coefficient of a light-weight dense near-zero-expansion metal-based composite material. Background technique [0002] Most materials in nature exhibit the phenomenon of "expanding with heat and contracting with cold". This characteristic of materials not only provides many conveniences to human beings, but also brings many troubles to modern life. The main reason is that thermal expansion and contraction will cause thermal stress inside the material, and even lead to cracks and failure of the material. The nature of a material's volume change with temperature can also have a major impact on the accuracy of precision parts. For example, for the precise light focusing and optical path alignment of precision optical equipment such as telescopes, laser equipment, and optical fiber communications, the "minimum loss" of the co...

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Problems solved by technology

However, the above-mentioned patent has the following disadvantages: patent 201611041751.3 cannot realize the adjustment of a wide range of thermal expansion coefficients, it is difficult to prepare a composite material with zero expansion, and patent 201611041751.3 cannot change the temperature range where the low thermal expansion coefficient occurs

Due to the characteristics of the material itself, the resin-based composite material has the disadvantages of brittleness, easy aging, non-temperature resistance, and easy damage, which greatly limits its application range.

However, there are no relevant reports at home and abroad on the research of metal matrix composites with light weight, near-zero expansion characteristics and metal properties.

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