EA013289B1 - Gold-based alloy - Google Patents

Abstract

The invention relates to metallurgy of gold alloys production used for jewelry manufacture. The invention is characterized in that the following components are used for the production of alloy of purple-violet color: gold and aluminum interacting with impurities being in their composition and impurities originating in chemical reaction in ratio (mass %): 77.5-79.0 - gold and 21.5-19.5 – aluminum; 0-1 - alloy. Said alloy can be used in the production of insert parts or cover plates for jewelries thus stipulating advantages in market opportunities of gold jewelries.

Description

The invention relates to the metallurgy of precious metals, namely to gold-based alloys intended for use in the jewelry industry.

The color scheme of gold-based alloys used in the manufacture of jewelry is quite diverse and varies depending on the alloyed components and their concentration from red to white.

Closest to the claimed alloy are alloys based on gold of the 750th sample used in the jewelry industry, containing the following components (in wt.%) And having the following color characteristics

Table 1. Gold alloys of the 750th test

Share content,% Colour Ai A® Si Wg rts Νί Ζη 75 4.0 21.0 red 75 8.3 16.7 reddish 75 12.5 12.5 bright yellow 75 25.0 green 75 5,0 20,0 white 75 7.0 14.0 4.0 white 75 8.0 8.0 9.0 white 75 3,5 16.5 5,0 white 75 9.0 14.0 2.0 white

Source: Khalilov I.Kh., Khalilov M.I. "Jewelry casting", publishing house SARATOV, 2001, p. 17.

But these alloys do not reflect the entire palette of possible colors of gold-based alloys and are rather ordinary.

A known alloy based on gold, containing components in the following quantity, wt.%: Gold 41,7-42,2; silver 5.5-6.5; zinc 6-12; copper - the rest (RF patent No. 2044091 dated 10.12.93. IPC C22C 5/02).

This pink alloy has an underestimated share of gold and cannot be used in the manufacture of original jewelry made of gold of a larger sample.

The objective of the invention is to obtain a characteristic pronounced amethyst (purple-violet) color of gold.

The problem is solved in that the gold-based alloy, including gold, additionally contains aluminum, as well as impurities arising during the chemical reaction in the following ratio, wt.%: Gold 77.5-79.0; aluminum 21.5-19.5; impurities - up to 1.

The range of ratios of components and possible colors is illustrated in Table 2.

table 2

gold aluminum impurities Colour 77 22 up to 1% white 77.5 21.5 up to 1% purplish violet 78 21 up to 1% purplish violet 78.5 20.5 up to 1% purplish violet 79 twenty up to 1% purplish violet 79.5 19.5 up to 1% white

CLAIM

Claims (1)

A gold-based alloy containing gold, characterized in that it further comprises aluminum and impurities arising during the chemical reaction in the following ratio of components, wt.%: Gold 77.5-79.0; aluminum 21.5-19.5; impurities - up to 1.