Lemon 18K gold and manufacturing method thereof

Abstract

The invention discloses lemon 18K gold and a manufacturing method thereof. The lemon 18K gold contains 75% of gold in mass percentage and 25% of repaired mouth in mass percentage; the repaired mouth comprises silver, copper, zinc and iridium powder; the ratio of the silver and the zinc to the copper in mass percentage is 1.2-1.3; the mass percentage of the zinc is 2.5-3.5%; and the mass percentage of the iridium powder is 0.004-0.012%. The manufacturing method comprises the steps of burdening, melting, refining and casting; in the refining process, mechanical disturbance is added; and a mouldis cast after being heated to 400-600DEG C. Through the invention, the problem that the traditional lemon 18K gold is bad in comprehensive mechanical property is solved.

Description

technical field [0001] The invention relates to a lemon-colored 18K gold and a manufacturing method thereof, belonging to the category of colored gold alloys and manufacturing methods thereof. Background technique [0002] Gold alloys for jewelry are usually represented by K, and 24K is called pure gold or ninety-nine gold, with a content of 99.99%. Common jewelry uses gold with a gold content of 75%, which is called 18K gold. 25% of a piece of 18K gold jewelry is Ni, Cu, Zn, Ag and other metals. These other metals used to produce gold alloys are called joints in the jewelry industry. Colored gold alloy is a common gold alloy for jewelry. Most of the so-called colored gold alloys are based on Au-Ag-Cu(-Zn) alloys. For gold alloys used in jewelry, color is one of the most important performance indicators. The color of the gold alloy depends on its reflectivity and the frequency of the incident light, essentially the energy band transition mechanism is at work. The color o...

AI Technical Summary

Problems solved by technology

Among the materials disclosed in the prior art, it is generally believed that iridium is used as a grain refiner for gold alloys. The difficulty lies in that the alloying of iridium is extremely difficult, and whether an iridium-containing master alloy with good dispersibility can be prepared is the key

Because it is very difficult to manufacture a well-dispersed iridium-containing master alloy, the cost of manufacturing is also very high, and related technologies are still rarely reported so far.

This greatly limits the commercial application of iridium as a grain refiner for gold alloys, and it is obvious that the prior art needs to be further improved.