A kind of gold alloy material with high fineness and high hardness and preparation method thereof

Abstract

The invention discloses a high-purity high-hardness alloy material which comprises the following components: scandium, calcium, magnesium, gold and impurities. A preparation method of the high-purity high-hardness alloy material comprises the following steps: a, preparing a gold-scandium intermediate alloy; b, preparing a gold-calcium intermediate alloy; c, pressing a gold-magnesium intermediate alloy; d, dosing; e, uniformly mixing the intermediately alloys dosed in the last step and placing on the bottom of a first copper crucible in a vacuum electric-arc furnace, paving Au9999 pure gold on the upper surface, placing titanium balls in the second copper crucible, sealing a furnace door, carrying out vacuum-pumping for the first time, charging an argon gas, carrying out vacuum pumping for the second time, and charging the argon gas; f, removing residual oxygen, melting down materials in the first copper crucible, regulating current, starting a magnetic stirring power supply, keeping for 1 minute-1.5 minutes, and interrupting power and solidifying molten metal; and g, carrying out solid solution treatment on a cast ingot, and carrying out cold-processing and ageing treatment. A pure gold alloy prepared by the high-purity high-hardness alloy material is fine in crystalline grain, a precipitated phase is dispersed in a base body, and hardness is high.

Description

technical field [0001] The invention relates to a gold alloy material with high fineness and high hardness and a preparation method thereof. Background technique [0002] Chinese people have been wearing gold jewelry for thousands of years, and they have long advocated high-quality gold jewelry (according to ISO9202:1991, pure gold refers to gold alloys with a gold content of not less than 99.0wt%, and thousand pure gold refers to gold alloys with a gold content of not less than 99.9wt% % gold alloy). After the opening of the gold jewelry market, traditional oriental culture and consumption preferences have not changed, and pure gold jewelry still maintains the largest share of gold consumption. However, there are some outstanding problems in the process of manufacturing and using traditional pure gold jewelry. Due to the low hardness of pure gold (only HV27 in the annealed state), it is difficult to meet the high-precision jewelry processing technology, it is difficult to...

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Problems solved by technology

In general, the modification of pure gold has achieved certain effects, and the strength and hardness have been improved to varying degrees, but there are still many problems, mainly manifested in: insufficient strength performance, and some modified pure gold has final hardness after treatment in various ways It is only about HV60, and the deformation hardness of some pure gold can reach HV110, but it is prone to natural aging softening, which is difficult to meet the production and use requirements; the color of some modified pure gold is not good, and it is easy to appear dull during use. ; The production conditions of some modified pure gold are harsh

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