Preparation method of bronze alloy with near zero thermal expansion property

Abstract

The invention provides a preparation method of a bronze alloy with the near zero thermal expansion property. According to the method, compositing of positive and negative thermal expansion materials is not needed, and the near zero thermal expansion property is obtained in the bronze alloy. The alloy specifically comprises, by mass, 74-83% of copper, 9-13% of manganese and 8-13% of aluminum. Due to the smelting, casting, hot processing, heat treatment and cold processing process, the alloy with a stable near zero thermal expansion coefficient (the heat expansion coefficient is equal to 0+ / -3X10<-6> / k) in the temperature interval of -100 DEG C to 150 DEG C can be prepared, and approaching to the thermal expansion coefficient level of a traditional invar alloy is achieved; and meanwhile thealloy has high electricity conductive and heat conductive performance, high strength, and good corrosion resisting capacity and process performance. The method is simple in process, convenient to operate and low in cost and easy to produce industrially, and can be better applied in the fields of the electronic industry and the precision meter industry and other fields sensitive to the size requirement.

Description

technical field [0001] The invention belongs to the technical field of material preparation, and in particular relates to a method for preparing a bronze alloy with near-zero thermal expansion performance. Background technique [0002] Near-zero thermal expansion material means that within a certain temperature range, the size of the material does not change or changes very little with the change of temperature. It is an indispensable structural material for precision instruments and equipment, and is widely used in aerospace, building materials, electronic packaging, Microelectronic devices, optical information devices and other fields sensitive to size requirements. [0003] At present, most of the zero-expansion materials are non-metallic materials, which have the disadvantages of low plasticity, difficult processing, poor toughness, and high price. Due to the advantages of metal alloys such as good toughness, good plastic processing performance, and impact load resistan...

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Problems solved by technology

[0003] At present, most of the zero-expansion materials are non-metallic materials, which have the disadvantages of low plasticity, difficult processing, poor toughness, and high price.

Due to the advantages of metal alloys such as good toughness, good plastic processing performance, and impact load resistance, the development of metal alloys with near-zero thermal expansion is of great significance for expanding the practical application of this material. In recent years, some alloys with zero thermal expansion have appeared. , such as metal composites, Fe-Ni Invar alloys, some Ti alloys, etc., the coefficient of thermal expansion is lower than 3×10 -6 / K, but there are also problems such as high cost, poor corrosion resistance, poor electrical and thermal conductivity, etc., which limit its wide application

In addition, general bronze has the characteristics of low cost, good corrosion resistance, good electrical and thermal conductivity, etc., but its thermal expansion coefficient is relatively large, often greater than 15×10 -6 / K

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