Control method of expansion coefficient of light weight dense near zero expansion metal matrix composites

Abstract

The invention provides a method for controlling the expansion coefficient of a lightweight and dense near-zero expansion metal matrix composite material, comprising: using a negative expansion material Mn 3 (Mn x Zn y sn z )N powder and metal matrix powder are raw materials, and the metal matrix is ​​selected from any one of pure aluminum, pure copper, aluminum alloy, magnesium alloy, titanium alloy, and copper alloy; the negative expansion material Mn 3 (Mn x Zn y sn z ) N powder is mixed with the metal matrix powder to obtain a mixed powder; adjust the ratio of the negative expansion material powder and the metal matrix powder, and / or adjust the negative expansion material Mn 3 (Mn x Zn y sn z ) N powder particle size, to obtain light and dense near-zero expansion metal matrix composites; wherein: the negative expansion material powder accounts for 1-50% of the total volume of the metal matrix composite, and the metal matrix powder accounts for 1-50% of the total volume of the metal matrix composite. 99%‑50% of the total volume; negative expansion material Mn 3 (Mn x Zn y sn z ) The particle size of the N powder is adjusted within less than 150 μm. The present invention adjusts the negative expansion material Mn 3 (Mn x Zn y sn z ) N powder particle size and content, so as to realize the regulation of thermal expansion coefficient (including zero expansion) of various metal matrix composites.

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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