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Preparation method of wolframium sintered body

A technology of tungsten-aluminum alloy and sintered body, which is applied in the field of preparation of tungsten-aluminum alloy sintered body, to achieve the effects of inhibiting oxidation behavior, convenient operation, and short sintering time

Active Publication Date: 2004-09-01
CHANGZHOU INST OF ENERGY STORAGE MATERIALS &DEVICES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

So far, there are no reports at home and abroad on the research on the preparation of high-density sintered bodies of this alloy.

Method used

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  • Preparation method of wolframium sintered body
  • Preparation method of wolframium sintered body

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0008] Embodiment 1: the weight is 35 grams, the W of particle size less than 100 nanometer 0.9 Al 0.1 The powder is put into a graphite mold, and the vacuum pressure is less than 10 -2 Sintering under the condition of MPa, the sintering temperature is 1600°C, the pressure is 40MPa, and the sintering time is 60 minutes. After the sample is polished and analyzed, the relative density is 98.2%, the compressive strength is 1730MPa, the bending strength is 480Mpa, the elastic modulus is 60GPa, and the microhardness is 720Hv.

Embodiment 2

[0009] Embodiment 2: the weight is 32 grams, the W 0.8 Al 0.2 The powder is put into a graphite mold, and the vacuum pressure is less than 10 -2 Sintering under the condition of MPa, the sintering temperature is 1500°C, the pressure is 30MPa, and the sintering time is 45 minutes. After the sample is polished and analyzed, the relative density is 99.2%, the compressive strength is 1862MPa, the bending strength is 493Mpa, the elastic modulus is 65GPa, and the microhardness is 760Hv.

Embodiment 3

[0010] Embodiment 3: the weight is 30 grams, the W of particle size less than 100 nanometer 0.6 Al 0.4 The powder is put into a graphite mold, and the vacuum pressure is less than 10 -2 Sintering under the condition of MPa, the sintering temperature is 1400°C, the pressure is 30MPa, and the sintering time is 30 minutes. After the sample is polished and analyzed, the relative density is 99.5%, the compressive strength is 2043MPa, the bending strength is 520Mpa, the elastic modulus is 50GPa, and the microhardness is 778Hv.

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Abstract

The invention relates to a process for preparing wolfram aluminum alloy sintered body comprises the steps of, selecting wolfram aluminum powdered alloy with particles less than 100 nanometer, loading into graphite mold, electrifying for heating under the condition of vacuum pressure intensity less than 1 / 100 MPa, applying bipolar voltage simultaneously, the sintering temperature being 1200 deg. C - 1600 deg. C, the pressure being 15-40 MPa, the sintering time being 5-60 minutes, the surface of the sintered body is polished by diamond grinding board, with the relative density being 95-99.8%. The process can be applied to prepare highly compact block-shaped wolfram-aluminum alloy.

Description

technical field [0001] The invention belongs to a preparation method of a tungsten-aluminum alloy sintered body. Background technique [0002] Tungsten-aluminum alloy is an emerging technical material researched and developed in recent years. It has both the high temperature resistance of tungsten and the light weight and oxidation resistance of aluminum, so that the alloy has high hardness, high temperature stability and low density (rich aluminum alloy The density can reach 4.2g / cm 3 ), is developing into a new type of high-temperature-resistant material with high hardness, high strength, and high oxidation resistance temperature, which will be applied in high-performance high-temperature structural materials, aerospace materials, electrical contacts, and high-temperature heating elements. [0003] Powder metallurgy sintering is the basic method for preparing bulk alloys from powder. Due to the high melting point and high temperature resistance of tungsten, it is difficul...

Claims

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Application Information

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IPC IPC(8): C22C1/04C22C21/00C22C27/04
Inventor 马贤峰祝昌军汤华国赵伟鄢俊敏
Owner CHANGZHOU INST OF ENERGY STORAGE MATERIALS &DEVICES
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