Casting copper-chromium alloy and preparation method thereof

Abstract

The invention discloses a casting copper-chromium alloy and a preparation method thereof. The alloy is characterized in that the alloy comprises the following components by weight percentage: 6.5 to 13 percent of copper-chromium master alloy, and the balance being copper, wherein the copper-chromium master alloy comprises 4 mass percent of chromium; the casting copper-chromium alloy has the following mechanical properties: tensile strength sigma b between 260 and 415 MPa, elongation delta between 20 and 37 percent, hardness HB between 93 and 130, and electrical conductivity IACS between 80 and 95 percent. The casting copper-chromium alloy is subjected to casting, melting, heat treatment and aging treatment. Compared with the prior casting copper chromium 0.3 / 0.5 alloy, the method of the invention has the advantages of obtaining the casting copper-chromium alloy with low chromium content between 0.28 and 0.52 percent by preparing the copper-chromium master alloy, increasing tensile strength by 21 percent, increasing electrical conductivity by 15 percent and meeting the requirement of high-voltage electrical products on special performance.

Description

technical field [0001] The invention relates to a cast copper-chromium alloy and a preparation method thereof, in particular to a cast copper-chromium alloy used for conductive parts of high-voltage electrical appliances and a preparation method thereof. Background technique [0002] In high-voltage electrical products, aluminum-silicon casting alloys are mostly used as conductive parts, such as ZL101H-T6. The mechanical and electrical performance requirements of the material are: tensile strength (б b ) 226MPa, elongation (δ) 3%, Brinell hardness (HB) 75; electrical conductivity (IACS) 36%. However, some conductive parts are required to have higher conductivity according to the different parts of their use. In order to meet the special performance requirements of high-voltage electrical products, a cast copper-chromium alloy material is required. The selection of copper-chromium alloy is mainly based on the requirement of electrical conductivity, and the requirement of me...

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Problems solved by technology

They are mostly hard and brittle metal compounds. When the amount is small, the strength can be increased and the plasticity can be reduced. When the amount is large, the strength and plasticity can be greatly reduced at the same time.

[0004] An existing cast copper chromium 0.3 alloy (ZCuCr0.3), the chromium content is 0.15-0.45%; the tensile strength (б b ) 216MPa, elongation (δ) 20%, Brinell hardness (HB) 65; electrical conductivity (IACS) 80%; ZCuCr0.3 alloy properties can not meet the requirements of high-voltage electrical products - low tensile strength

Another cast copper-chromium 0.5 alloy (ZCuCr0.5) can meet the tensile strength requirements of high-voltage electrical products, but the casting process of this cast alloy is very poor, and the pass rate of the whole process of parts is only 35%.

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