Method for producing platinum group metal or platinum group-based alloy
a platinum group metal and alloy technology, applied in the field of platinum group metal or platinum group-based alloy production, can solve the problems of large economic loss in the production of very degrading material yield, easy to break down the molded body, etc., and achieves improved material yield of expensive platinum group metals or expensive platinum group-based alloys, improved strength, and effective suppression of scattering of raw materials during melting
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example 1
[0061]In Example 1, five molded bodies each having dimensions of 20 mm×20 mm×50 mm were prepared. The five molded bodies were vertically stacked with surfaces of 20 mm×20 mm thereof being upper and lower surfaces. The molded bodies in a stacked state were arranged in a setter formed of carbon, and the molded bodies, together with the setter, were inserted into an atmospheric furnace including a carbon heater. Sintering was performed to obtain a sintered body at 1,500° C. for 3 hours under argon airflow. With regard to the density of the molded body calculated from the dimensions and the mass, the relative density was 52%. The density of the sintered body was 74%. Using the sintered body as the raw material rod, a molten ingot having a diameter of about φ35 mm×a length of L 150 mm was manufactured.
[0062]When visual observation was conducted during the melting (under a pressure of 1.1×105 Pa), the scattering phenomenon was not at all observed. The reduction in mass of the molten ingot...
examples 2 and 3
[0064]In Example 2, the same procedure as in Example 1 was repeated except that the sintering temperature was changed to 1300° C. In Example 3, the same procedure as in Example 1 was repeated except that the sintering temperature was changed to 1200° C. The density of the sintered bodies obtained in Examples 2 and 3 were 74% and 71%, respectively. Using the sintered body as the raw material rod, a molten ingot having a diameter of about φ35 mm×a length of L 150 mm was manufactured. In Examples 2 and 3 as in the case of Example 1, when visual observation was conducted during the melting (under a pressure of 1.1×105 Pa), the scattering phenomenon was not at all observed. The reduction in mass of the molten ingot from the raw material preparing step was 0.6% or less. Further, after the sintering until the melting was completed, the raw material rod was not broken or exfoliated.
[0065]Almost no scattered material was left in the furnace after the melting, and attachment of the scattered ...
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