oa The Wetting of Platinum and its Alloys by Glass

In the concluding part of this study of platinum alloys for use in the glass industry, correlations between structure, composition and high temperature mechanical properties have been obtained in the platinum-rich corner of the gold - rhodium - platinum system. Although gold additions decrease the melting point of rhodium-platinum alloys, the effect is not pronounced. The alloy containing 5 per cent gold and 10 per cent rhodium which was shown in the previous parts of the paper to be particularly resistant to wetting has a solidus between 1730°C and 1760°C. This alloy is single phased at temperatures above 1100°C and is more resistant to creep than the 10 per cent rhodium-platinum solid solution. Some of these improved high temperature properties are sacrificed if the gold content is reduced to 3 per cent.