Hard platinum alloy and preparation method thereof

Abstract

The invention discloses hard platinum alloy and a preparation method thereof. The hard platinum alloy is prepared from the following components in percentage by weight: 89.9-95.99wt% of platinum, 4.0-9.6wt% of cobalt and 0.01-0.5wt% of X. The preparation method comprises the following steps: burdening, metal melting, and forming, wherein metal melting is that weighed metal is put into an alumina crucible and heated to 1850-1900 DEG C to carry out melting; forming is that platinum alloy after being melted into liquid is poured into a strip groove to obtain the platinum alloy after being solidified; and the platinum alloy after being cooled is heated to 700-800 DEG C, heat preservation is carried out for 3h, slow cooling along with a furnace is carried out, and annealing treatment is realized. According to the preparation method, the phenomena that a casting breaks and deforms when a platinum alloy rough blank is casted are effectively prevented, the contractible and volatile blowholes are prevented from occurring in the platinum alloy casting, and in addition, the phenomenon that stones loosen and fall in the stone inlaying procedure is prevented.

Description

technical field [0001] The invention relates to the field of metal and alloy materials, in particular to a hard platinum alloy and a preparation method thereof. Background technique [0002] Platinum alloys refer to alloys made of platinum mixed with other metals, such as palladium, rhodium, yttrium, ruthenium, cobalt, osmium, copper, etc. Although the hardness of platinum is higher than that of gold, it is not enough for inlays. It must be alloyed with other metals before it can be used to make jewelry. [0003] At present, the types of platinum alloys processed into platinum jewelry in China include PT900, PT950 and PT999. Wherein, the composition of PT900 platinum alloy is 90% platinum and 10% palladium or 10% copper, and the composition of PT950 platinum alloy is 95% platinum and 5% palladium or 5% copper. However, palladium is a very active metal, which will absorb a large amount of hydrogen at high temperature, resulting in a large amount of gas inside the alloy, and...

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Problems solved by technology

However, palladium is a very active metal, which will absorb a large amount of hydrogen at high temperature, resulting in a large amount of gas inside the alloy, and these gases are difficult to remove; eventually, there are shrinkage and gasification pores in platinum alloy castings, which are prone to fracture ; Moreover, the platinum-palladium alloy has low hardness and is easy to deform, and it is easy to drop stones and turquoise during the stone setting process.

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