A red gold alloy for firing high-temperature transparent enamel and its preparation method

Abstract

The invention discloses red gold alloy used for firing high-temperature transparent enamel and a preparing method of the red gold alloy. The red gold alloy used for firing the high-temperature transparent enamel comprises, by weight, 75.0-75.5% of gold, 22.5-23.2% of copper, 0.9-1.2% of silver, 0.5-0.8% of zinc, 0.2-0.4% of palladium, 0.01-0.03% of silicon, 0.008-0.02% of scandium, 0.0005%-0.001% of boron and other inevitable impurities. The preparing method of the red gold alloy for firing the high-temperature transparent enamel is characterized by comprising the steps that firstly, raw materials are melted under the protective atmosphere; and secondly, after all the materials are melted down, the temperature of molten metal is adjusted, and an ingot casting is obtained through casting. The red gold alloy has good high-temperature oxidation resisting performance, and high-temperature firing can be better borne; the thermal expansion coefficient is close to the thermal expansion coefficient of common gold high-temperature enamel; superior cold machining performance is achieved, and the phenomenon of brittle failures does not occur in the machining process; and grains are fine, the organization is compact, and a highly-polished surface can be obtained.

Description

technical field [0001] The invention relates to a red gold alloy for firing high-temperature transparent enamel and a preparation method thereof. Background technique [0002] In the K gold series, K red gold has become a fashion trend in today's international jewelry industry, especially in oriental countries, because of its gorgeous and elegant color, compared with gorgeous gold and low-key platinum. According to its unique color, people in the industry give this kind of material a romantic name called rose gold, which represents the eternal theme of human beings---love. The application of enamel technology to rose gold jewelry can significantly increase the artistic effect of jewelry. However, when using rose gold as the base for firing high-temperature enamel on the market, several prominent problems are often encountered: First, the alloy material is fired at high temperature. The oxidation of the surface after processing is very serious, which affects the decorative e...

AI Technical Summary

Problems solved by technology

The application of enamel technology to rose gold jewelry can significantly increase the artistic effect of jewelry. However, when using rose gold as the base for firing high-temperature enamel on the market, several prominent problems are often encountered: First, the alloy material is fired at high temperature. The oxidation of the surface after processing is very serious, which affects the decorative effect of enamel, such as figure 1 The second is that the metal base after firing enamel becomes brittle, and it is prone to breakage in the subsequent grinding, stone setting, polishing and other processes. When the brittleness is severe, the alloy is as easy to break as dry wood. figure 2 , completely different from precious metal alloys with excellent toughness and plasticity, which brings great trouble and difficulty to jewelry production; third, the surface of rose gold jewelry is easy to become dull and discolored after being used or placed for a period of time, without the initial brightness and luster; When casting rose gold jewelry, the problem of surface shrinkage is often encountered, which seriously deteriorates the surface quality of the jewelry, such as image 3

Especially when shrinkage occurs on the glazed surface of the base, it will seriously affect the decorative effect of the enamel, causing the color of the enamel layer to be cloudy or burst

When jewelry has a large-scale shrinkage problem, such as through welding or polishing, the workload is heavy, time-consuming, and the effect is poor. In many cases, the jewelry has to be scrapped, which affects the production schedule and cost of the enterprise.

Images