Cr2Nb phase containing CuCr contact material preparing method

Abstract

The invention discloses a Cr2Nb phase containing CuCr contact material preparing method. The Cr2Nb phase containing CuCr contact material preparing method comprises the following steps that S1, burdening is conducted, and raw materials are matched according to the proportion; S2, vacuum induction smelting is conducted, prepared raw materials are arranged in a ceramic crucible, under vacuum conditions, gradient heating is conducted, and the raw materials are melted; S3, casting cooling is conducted, when the raw materials are completely melted, components are uniform under the action of electromagnetic stirring, molten liquid in the ceramic crucible is poured into a water cooling die, and cooling and furnace discharging are conducted; S4, hot forging deformation and heat treatment are conducted, the hot forging technology is adopted for deforming a cast ingot to the needed size, and then heat treatment is conducted; and S5, machining is conducted, and machining equipment is adopted formachining the cast ingot into the needed contact shape according to a drawing. By means of the Cr2Nb phase containing CuCr contact material preparing method, the strength and the hardness of a contactcan be effectively improved, meanwhile, the high-temperature-resisting performance of the material is greatly improved, the contact is better resistant to ablation and high-temperature deformation, and meanwhile the service life of the contact is greatly prolonged.

Description

technical field [0001] The invention relates to the technical field of alloy contact preparation, in particular to a 2 Preparation method of CuCr contact material in Nb phase. Background technique [0002] CuCr alloy contact material is an important device in medium-voltage vacuum circuit breakers. Its manufacturing processes mainly include powder metallurgy process and vacuum induction melting process. Among them, vacuum induction melting process is a mainstream process for preparing copper-chromium alloy contacts. Conventional vacuum The raw materials used in the induction melting process are pure copper and pure chromium, without the addition of third elements. Although they can meet the requirements of use, there are still problems in the service process, such as insufficient breaking capacity, insufficient welding, ablation resistance, and low high temperature creep resistance. And other phenomena, which greatly limit the electrical life of this type of material. [0...

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Problems solved by technology

[0002] CuCr alloy contact material is an important device in medium-voltage vacuum circuit breakers. Its manufacturing processes mainly include powder metallurgy process and vacuum induction melting process. Among them, vacuum induction melting process is a mainstream process for preparing copper-chromium alloy contacts. Conventional vacuum The raw materials used in the induction melting process are pure copper and pure chromium, without the addition of third elements. Although they can meet the requirements of use, there are still problems in the service process, such as insufficient breaking capacity, insufficient welding, ablation resistance, and low high temperature creep resistance. and other phenomena, which greatly limit the electrical life of this type of material

[0003] Moreover, the hardness and strength of the copper-chromium contacts prepared in the prior art are low, and the welding resistance, pressure resistance, and breaking ability are poor in the service process; The impact of the dynamic and static contacts during the opening and closing process is easily deformed, which affects the service life of the contacts

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