Method for producing reinforced platinum material

Abstract

[Problems]Providing a strengthened platinum material with the use of melt-sprayed platinum alloy powder and through a simpler working process, which ensures strength of weld and is excellent in high temperature creep property. [Means for Solving the Problems]In a method for producing a strengthened platinum material, comprising the steps of: adding an organic solvent and wet-milling a platinum alloy powder obtained by melt-spray; degassing the milled platinum alloy fine powder by heating; sintering the fine powder; and forging the fine powder, wherein the method further comprises subjecting a sintered body formed by the sintering to oxidation treatment; and subjecting the sintered body to compression molding.

Description

TECHNICAL FIELD [0001] The present invention relates to a method for producing a strengthened platinum material, and especially to a technology of producing a strengthened platinum material with the use of a platinum alloy powder obtained through melt-spray. BACKGROUND ART [0002] Regarding a strengthened platinum material acting as a structural material used in handling a glass material or ceramic material, such as an optical glass and an optical fiber, in a molten state, various producing methods have been conventionally proposed. The strengthened platinum material is required to have such properties as a high creep strength and no occurrence of blisters. [0003] As producing methods of a strengthened platinum material having high temperature strength properties, for example to improve a high creep strength at 1400° C., a method is known in which the metal oxide such as zirconium oxide is finely and uniformly dispersed in a platinum base metal of the strengthened platinum material. ...

AI Technical Summary

Benefits of technology

The present invention aims to improve the production of strengthened platinum materials by simplifying the operation and preventing issues such as voids and splashes during welding. The invention proposes a method involving adding an organic solvent and wet-milling a platinum alloy powder, degassing the milled powder, sintering, and forging. By subjecting a sintered body to oxidation treatment and compression molding, the method allows for easier handling and higher yield of production. The invention also provides a method for producing a compact with high-density and high-creep strength. The technical effects of the invention include improved production efficiency, simplified operation, and reduced forging time.

Problems solved by technology

Thus, the present inventors' proposed manufacturing method, which involves the above-described oxidation treatment caused prolonged manufacturing time associated with increased steps and loss of platinum bare metal associated with adhesion of platinum to an alumina tray, thereby suffering from a defect that manufacturing yield cannot be improved.

Since the platinum bare metal is adhered to the heat-resistant container during the degassing, troublesome maintenances including shaving off the adhered matters with the use of a knife or spatular material are required.

Further in forging, an agglomeration of platinum alloy powder, namely an ingot tends to crumble very easily.

Additionally, a bond strength of platinum particles immediately after sintering is so weak that an ingot crumble very easily.

Even if forging can be carried out under ideal conditions, some platinum tends to crumble from porous portions of a surface of an ingot.

Thus, it has been an inherent problem that costly platinum base metal will get scattered and lost, thereby production yield cannot be improved.

Plate materials of platinum alloy obtained through rolling after forging tend to cause, during welding, voids and splashes (phenomenon in which fine molten metals splash and spatter during welding of a strengthened platinum material).

However, only a small proportion of air and gaseous component remaining in the ingot are trapped among sintered platinum grains, which will lead to voids and splashes during welding.

Oxide-dispersion-strengthened platinum materials are known to have an extremely deteriorated strength of weld thereof compared with that of a base material.

Consequently, strengthened platinum materials, which often cause voids and splashes, will cause deteriorated weld strength and are likely to cause damages such as breakage of a glass melting tank.

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