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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

Inactive Publication Date: 2017-02-16
ISHIFUKU METAL IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides a method for producing a sintered body with improved yield and strength, compared to the related-art production methods. The sintered body has a higher density, which allows more raw material to be mounted on the crucible, thereby improving productivity. The sintered body has a lower volume per the same mass, which makes it easier to transport and handle. The method effectively suppresses scattering of the raw material during melting and prevents powder from dropping or exfoliating, ultimately contributing to change in composition.

Problems solved by technology

Thus, the molded body is easily broken down due to an impact caused by being dropped or other factors, and also causes powder that exfoliates from a surface of the molded body during conveyance, thereby degrading a material yield.
That is, the material yield is degraded, thereby causing a large economic loss in production of a very expensive platinum group metal.
When the molded body is broken to cause a piece thereof to be dropped, cause powder on the surface of the molded body to exfoliate, or cause the molten metal to scatter while being molten, a component contained in that portion is not included in the molten ingot, and hence accurate alloy composition cannot be obtained.
Such a case may also prevent the alloy composition from being accurate.

Method used

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  • Method for producing platinum group metal or platinum group-based alloy
  • Method for producing platinum group metal or platinum group-based alloy

Examples

Experimental program
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Effect test

example 1

[0060]Example 1 represents an example of the description above (best mode for carrying out the invention).

[0061]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 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.

[0063]Almost no scattered material was left in the furnace after the melting, and attachment of the scattered material to the water-cooled copper crucible was not recognized.

example 2

[0064]In Example 2, the molded body was manufactured as in the case of Example 1. The molded body was substantially in the shape of a rectangular parallelepiped having dimensions of 20 mm×20 mm×50 mm with corners having an R of 2 mm. Such molded bodies were individually sintered without being stacked to manufacture sintered bodies of about 16 mm×16 mm×44 mm. The sintered bodies were placed on a boat-shaped water-cooled copper crucible and were molten by vacuum plasma melting to manufacture a molten ingot of about 15 mm×30 mm×100 mm. The pressure during the melting was adjusted to be 5×10−1 Pa (Ar).

[0065]In visual observation during the melting, occasional scattering was observed. A small amount of the scattered material was left in the furnace after the melting, with part thereof being attached to the water-cooled copper crucible.

[0066]The reduction in mass of the molten ingot was 2.5%. Further, with regard to the shape of the molten ingot, the bottom portion was approximately smoot...

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Abstract

An object of the present invention is to provide a molten ingot of a platinum group metal or a platinum group-based alloy having a high material yield by suppressing a scattering phenomenon during heating and melting in a method for producing a platinum group metal or a platinum group-based alloy. The method for producing a platinum group metal or a platinum group-based alloy according to the present invention includes a preparing step of weighing a raw material that is partially or entirely of powder and, when the alloy is to be produced, mixing the weighed raw material to obtain a powder mixture, a molding step of molding and solidifying the prepared raw material to obtain molded bodies, a sintering step of sintering the molded bodies to obtain a sintered body, a melting step of melting the sintered body to produce a molten ingot, and a deformation processing step of processing the molten ingot. In the sintering step, the molded bodies are sintered in a stacked state to produce a sintered body as a joined body.

Description

TECHNICAL FIELD[0001]The present invention relates to a method for producing a platinum group metal or a platinum group-based alloy, and more particularly, to production of a molten ingot in amethod for producing a platinum group metal or a platinum group-based alloy.BACKGROUND ART[0002]A platinum group metal or a platinum group-based alloy is designed using heat resistance, oxidation resistance, and chemical resistance of the platinum group metal, and is widely used as a high temperature member or a corrosion-resistant product. The platinum group metal as used herein collectively refers to Pt, Pd, Rh, Ir, Ru, and Os.[0003]Processes for production of a platinum group metal or a platinum group-based alloy generally include a compounding step, a melting step, a deformation processing step, and the like for an alloy raw material. In the melting step, a melting method for producing a molten ingot can be classified into several types. A platinum group metal as a main component has a very...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): B22D11/041C22B9/22C22B11/02B22F3/16
CPCB22D11/041C22B11/02C22B9/22B22F3/16B22D21/022C22C1/0466B22F2998/10B22F1/00B22F3/10B22D11/00
Inventor DOI, YOSHINORIEGAWA, YASUNORIKON, DAISUKE
Owner ISHIFUKU METAL IND CO LTD
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