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Aluminium tungsten carbide hard alloy sintered body

A tungsten carbide-aluminum and cemented carbide technology is applied in the field of tungsten carbide-aluminum cemented carbide sintered bodies, which can solve the problems of difficult to achieve high-density sintering, and achieve the effects of excellent oxidation resistance, high hardness and short sintering time.

Inactive Publication Date: 2008-07-30
CHANGZHOU INST OF ENERGY STORAGE MATERIALS &DEVICES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Powder metallurgy sintering is the basic method of powder sintering into blocks, but due to the high melting point and high temperature resistance of tungsten carbide aluminum cemented carbide, it is difficult to achieve high-density sintering by general powder metallurgy methods
The synthesis technology of tungsten carbide aluminum alloy powder is still in its infancy, so far, there is no report about the alloy sintered body at home and abroad

Method used

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  • Aluminium tungsten carbide hard alloy sintered body

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Embodiment 1: with 30 grams of (W 0.9 Al 0.1 ) C and 3 grams of cobalt powder are mixed and put into graphite moulds, and the weight ratio of the two is 10; 1, at 10 -1 MPa~10 -2 Sintering under MPa vacuum condition, the sintering temperature is 1600°C, the pressure is 37.5MPa, the sintering time is 30 minutes, the sample is polished, and the relative density is 98%. Microhardness 2200Kg / cm 3 , Bending strength 1573MPa.

Embodiment 2

[0014] Embodiment 2: the weight is 25 grams (W 0.75 Al 0.25 ) C and a quality of 2.50 grams of cobalt powder are mixed and put into graphite moulds. -1 MPa~10 -2 Sintering under MPa vacuum condition, the sintering temperature is 1500°C, the pressure is 35.5MPa, and the sintering time is 25 minutes. The samples were polished and had a relative density of 97%. Microhardness 2035Kg / cm 3 , Bending strength 1421MPa.

Embodiment 3

[0015] Embodiment 3: the weight is 20 grams (W 0.5 Al 0.5 ) C and a quality of 2.00 grams of cobalt powder are mixed and put into graphite moulds. The proportioning ratio of the two weights is 10. -1 MPa~10 -2 Sintering under MPa vacuum condition, the sintering temperature is 1450°C, the pressure is 35.5MPa, and the sintering time is 30 minutes. The samples were polished and had a relative density of 98%. Microhardness 1650Kg / cm 3 , Bending strength 1337MPa.

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Abstract

The invention relates to a tungsten-cemented aluminium carbide sintered body, and the expression is(W1-xAlx)C-Co, in which x=0.1-0.86, which is alloy block-shaped material with good crystalline shape and fine texture. Proved by X-ray powder diffraction analysis and scanning electron microscope analysis, the tungsten-cemented aluminium carbide sintered body is of stable structure, improved crystallinity and higher degree of compactness. The tungsten-cemented aluminium carbide sintered body of this invention not only has glass hard and high-wearing feature of tungsten carbide, but also has lightweight, oxidation resistance and fine ductility of aluminium, which makes the alloy have high hardness, high bending strength and lower density and develop into new carbide alloy with high hardness, high strength, good workability and high oxidation-resistance temperature. The said material is hoped to be used in mechanical tool, glass-cutting, bolt die, broaching die, bowl, well drill, mine drill, cutting drill and electrical contact material.

Description

Technical field: [0001] The invention belongs to a tungsten carbide aluminum cemented carbide sintered body, in particular to preparing a tungsten carbide aluminum cemented carbide sintered body by using tungsten carbide aluminum powder as a raw material and cobalt as a binder phase through vacuum hot pressing sintering technology. Background technique: [0002] Tungsten carbide aluminum cemented carbide is an emerging technical material researched and developed in recent years. Tungsten carbide aluminum refers to a substitutional solid solution alloy formed by part of Al atoms entering the tungsten site in the WC lattice. On the basis of high hardness and high wear resistance of tungsten carbide, it also has the light weight, oxidation resistance and excellent ductility of aluminum, so that the alloy has high hardness (microhardness greater than 1200Kg / cm 3 ), high bending strength (above 1100MPa) and low density (the density of rich aluminum alloy can reach 3.0g / cm 3 ), i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C29/06
Inventor 马贤锋乔竹辉汤华国赵伟蔡曙光赵波
Owner CHANGZHOU INST OF ENERGY STORAGE MATERIALS &DEVICES
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