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Tungsten alloy high temperature tool materials

a tool material and high-temperature technology, applied in the direction of coatings, layered products, chemistry apparatuses and processes, etc., can solve the problems of insufficient high-temperature hardness of metallic tool materials, insufficient wear resistance and toughness, and a tendency to deform under stress

Inactive Publication Date: 2005-06-16
UT BATTELLE LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0005] In accordance with one aspect of the present invention, the foregoing and other objects are achieved by a tool made f

Problems solved by technology

Currently available tooling materials, for example, rotary parts and friction stir welding tools for joining ferrous and high-temperature materials, do not generally provide to a sufficient degree the combination of wear resistance and toughness that is necessary for applications at temperatures above 800° C. Most known metallic tool materials have insufficient high-temperature hardness, and tend to deform under stress, strain and / or wear at high temperatures.
Moreover, most known ceramic tool materials have insufficient toughness for many applications, and tend to crack or fracture under stress and / or strain.

Method used

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  • Tungsten alloy high temperature tool materials
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Examples

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Effect test

example i

[0011] A tungsten alloy of nominal composition W-26% Re-0.28% Hf-0.02% C was produced by consumable vacuum arc melting of an electrode consisting of tungsten bar, electron-beam melted rhenium slugs, hafnium wire and carbon yarn. An ingot of 75-mm diameter was formed, then hot extruded with a preheat temperature of 2000° C. to bar of 37 mm diameter. The extruded bar was machined to produce a tool for use in friction stir welding. The tool was used to friction stir a length of 50 cm of stainless steel plate. The wear of the tool during the weld processing was less than 25 micrometers.

[0012] The material may also be used as a surface layer on a lower cost tool substrate material to provide the benefits of the present invention while providing a lower cost tool than one made entirely of tungsten alloy. The tungsten alloys described above can be used as surface layers on various other materials, for example, metals, alloys, cermets, and ceramics. The tungsten alloy surface layer can be ...

example ii

[0014] A tungsten alloy is prepared as described in Example I and coated onto an extrusion die by a conventional plasma spray method to form a tungsten alloy coated extrusion die.

[0015] Moreover, a tungsten alloy tool may have a surface layer of another material thereon. Suitable surface layer materials include those that are harder and / or more wear resistant than the tungsten alloys. Examples of suitable surface layer materials include but are not limited to, alone or in any combination: boron carbide, hafnium carbide, titanium carbide, niobium carbide, tantalum carbide, zirconium carbide, boron nitride, hafnium nitride, titanium nitride, niobium nitride, tantalum nitride, zirconium nitride, aluminum oxide, and hafnium oxide.

[0016] It follows that a tool having a tungsten alloy surface layer may have a further surface layer of another material thereon (as described hereinabove), with the tungsten alloy serving as an intermediate layer.

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Abstract

A tungsten alloy tool includes, in weight %, 3% to 27% rhenium, 0.03% to 3% hafnium, and 0.002% to 0.2% carbon, balance tungsten.

Description

[0001] The United States Government has rights in this invention pursuant to contract no. DE-AC05-00OR22725 between the United States Department of Energy and UT-Battelle, LLC.FIELD OF THE INVENTION [0002] The present invention relates to tungsten-based alloy tool materials, and more particularly to tungsten-based alloy tool materials that contain rhenium, hafnium, and carbon. BACKGROUND OF THE INVENTION [0003] Currently available tooling materials, for example, rotary parts and friction stir welding tools for joining ferrous and high-temperature materials, do not generally provide to a sufficient degree the combination of wear resistance and toughness that is necessary for applications at temperatures above 800° C. Most known metallic tool materials have insufficient high-temperature hardness, and tend to deform under stress, strain and / or wear at high temperatures. Moreover, most known ceramic tool materials have insufficient toughness for many applications, and tend to crack or f...

Claims

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Application Information

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IPC IPC(8): C22C27/04C22C29/00C23C30/00
CPCC22C27/04C23C30/005C22C29/00
Inventor OHRINER, EVAN K.DAVID, STAN A.
Owner UT BATTELLE LLC
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