A kind of high-hardness solid gold material and its preparation method

Abstract

The invention discloses a gold alloy material with high fineness and high hardness, which is composed of the following components: cobalt, antimony, scandium, gold and impurities. A method for preparing a high-quality and high-hardness gold alloy material, comprising the following steps: a. preparing a gold-cobalt master alloy; b. preparing a gold-antimony master alloy; c. preparing a gold-scandium master alloy; d. The ingredients are mixed evenly in the middle and placed on the bottom of the first copper crucible in the vacuum electric arc furnace, and then Au9999 pure gold is laid on it; titanium balls are placed in the second copper crucible, the furnace door is closed, and the first pumping is carried out. Vacuum, fill with argon; vacuumize for the second time, fill with argon; f, remove the residual oxygen first, then melt the material in the first copper crucible, adjust the current, start the magnetic stirring power supply, and keep it for 1~1.5min , and then cut off the power and solidify the molten metal; h, carry out solid solution treatment on the ingot, then cold work and aging treatment. The solid gold alloy prepared by the invention has fine crystal grains, precipitated phases are dispersedly distributed in the matrix, and has high hardness.

Description

technical field [0001] The invention relates to a high-hardness pure gold material 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 inlay gems, and it is d...

AI Technical Summary

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

Images