Tellurium beryllium copper alloy and preparation method thereof

Abstract

The invention discloses a tellurium beryllium copper alloy. The tellurium beryllium copper alloy comprises the following components in percentage by weight: 0.2-2.1wt.% of beryllium Be, 0.1-0.7wt. / % of tellurium Te, other elements: cobalt Co, nickel Ni, lead Pb, rare earth elements and impurity elements, and the balance of Cu, wherein lead Pb is smaller than or equal to 0.6wt.% and the sum of other elements is smaller than or equal to 4wt.%. A preparation method comprises the following steps: a, proportioning, feeding, smelting and casting the components in percentage by weight to obtain ingotblanks; and b, carrying out homogenization heat treatment, hot processing process, cold processing process and annealing, solid solution and aging heat treatment successively on the ingot blanks obtained in the step a to obtain the tellurium beryllium copper alloy. By adding tellurium into the tellurium beryllium copper alloy, tellurium and a copper matrix form a compound Cu2Te. The tellurium beryllium copper alloy is more excellent in heat processing property than that of a beryllium copper alloy, and also has the physical, mechanical and anti-corrosive properties of the beryllium copper alloy. By adding tellurium, the machinability of the beryllium copper alloy can be improved on the premise of environment-friendliness.

Description

Technical field [0001] The invention relates to an alloy preparation method, in particular to a free-cutting tellurium-beryllium copper alloy and a preparation method thereof. Background technique [0002] Beryllium copper is a copper-based alloy material with beryllium as the basic alloying element, which is a copper-based alloy strengthened by aging precipitation. After solution and aging heat treatment, the material has high strength, hardness and elastic limit, small elastic hysteresis, good stability, and has fatigue resistance, corrosion resistance, wear resistance, low temperature resistance, non-magnetic, high electrical and thermal conductivity, It has a series of excellent comprehensive properties such as no sparks when impacted. It is known as the "king of colored elastic materials" and is widely used in electronics, electrical, communications, instruments, meters, telecommunications, light industry, machinery, chemicals, coal and other fields . Beryllium copper allo...

AI Technical Summary

Problems solved by technology

[0006] 3. While meeting the turning requirements, the inherent mechanical properties of the material itself cannot be changed

[0008] 1. Lead-containing copper alloys will cause environmental pollution during production and use. Under the action of impurities in drinking water and organic acids, the lead in the alloy will slowly precipitate, endangering human health. This limits the use of lead-containing beryllium copper alloys. Used in home appliances, children's toys, electronic components, automobiles and other spare parts

For example, the European Union is gradually restricting the use of lead in copper alloys, but at present there is no lead-free beryllium-copper alloy with excellent turning performance to replace the market demand for lead-containing beryllium-copper alloys (the present invention solves this problem);

[0009] 2. Lead neither dissolves in copper nor forms an intermetallic compound with copper. The melting point of lead is low (327°C). Lead-containing beryllium-copper alloys are prone to cracking during thermal processing. Therefore, lead-containing beryllium-copper alloys are hot Poor processing performance

[0010] In recent years, there have been reports in the literature that bismuth was added to improve the machinability of copper alloys, but the addition of bismuth can greatly reduce the plasticity of copper alloys, and it is easy to cause cracks during plastic processing, so that it cannot be processed; the addition of bismuth can cause Fatigue cracking or stress corrosion cracking of materials during use, so bismuth, as an impurity element that seriously harms the properties of copper alloys, must be strictly controlled in smelting and processing, these reasons limit the practical application of bismuth in copper alloys

Images