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Tungsten carbide base hard alloy powder metallurgical material and its preparation method

A cemented carbide and powder metallurgy technology, applied in the field of low-cost high-performance tungsten carbide-based cemented carbide powder metallurgy materials and their preparation, can solve the problems of weakening and the actual mechanical properties of tungsten carbide alloys are not improved, and achieve porosity. The effect of low, shape and dimension accuracy is easy to control, and thermal efficiency is high

Inactive Publication Date: 2006-07-19
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the easy formation of more pores in aluminum-containing tungsten carbide alloy materials under pressureless sintering, the actual mechanical properties of tungsten carbide alloys have not been improved, but have been weakened to a large extent.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Step 1: Composition design of tungsten carbide-based cemented carbide powder

[0027] alloy composition:

[0028] WC: 94.5%,

[0029] Co: 4.0%,

[0030] Al: 1.0%,

[0031] TiC: 0.5%,

[0032] Contains unavoidable trace impurities.

[0033] The WC raw material is the WC powder produced by the blue tungsten powder along the hydrogen reduction carbonization method. The average particle diameter is about 3 μm, and the grain size is about 0.5 to 0.8 μm; Co and Al are added in the form of simple substances. 99.9%; the particle diameter of TiC is about 2-3 μm.

[0034] Step 2: Preparation of cemented carbide powder by high-energy ball milling

[0035] All ball milling processes are completed in a planetary ball mill. The material of the grinding ball is WC carbide, the ratio of the ball to the material is 10:1, the ball milling speed is 266r / min, and the high-purity Ar gas is used as the protective atmosphere.

[0036] First, the WC powder was individually ball-milled f...

Embodiment 2

[0040] Step 1: Composition design of tungsten carbide-based cemented carbide powder

[0041] alloy composition:

[0042] WC: 90.5%,

[0043] Co: 6.0%

[0044] Al: 1.5%,

[0045]TiC: 2.0%,

[0046] Contains unavoidable trace impurities.

[0047] The WC raw material is the WC powder produced by the blue tungsten powder along the hydrogen reduction carbonization method. The average particle diameter is about 3 μm, and the grain size is about 0.5 to 0.8 μm; Co and Al are added in the form of simple substances. 99.9%; the particle diameter of TiC is about 2-3 μm.

[0048] Step 2: Preparation of cemented carbide powder by high-energy ball milling

[0049] All ball milling processes are completed in a planetary ball mill. The grinding balls are made of WC cemented carbide, the ball-to-material ratio is 10:1, the ball milling speed is 266 r / min, and high-purity Ar gas is used as the protective atmosphere.

[0050] First, the WC powder was individually ball-milled for 75 hours, ...

Embodiment 3

[0054] Step 1: Composition design of tungsten carbide-based cemented carbide powder

[0055] alloy composition:

[0056] WC: 88.5%,

[0057] Co: 8.0%,

[0058] Al: 2.0%,

[0059] TiC: 0.5%,

[0060] VC: 1.0%,

[0061] Contains unavoidable trace impurities.

[0062] The WC raw material is the WC powder produced by the blue tungsten powder along the hydrogen reduction carbonization method. The average particle diameter is about 3 μm, and the grain size is about 0.5 to 0.8 μm; The particle diameters of TiC and VC are both about 2-3 μm.

[0063] Step 2: Preparation of cemented carbide powder by high-energy ball milling

[0064] All ball milling processes are completed in a planetary ball mill. The grinding balls are made of WC cemented carbide, the ball-to-material ratio is 10:1, the ball milling speed is 266 r / min, and high-purity Ar gas is used as the protective atmosphere.

[0065] First mix the TiC, VC and WC powders according to the designed distribution ratio, put th...

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Abstract

The invention provides a tungsten carbide based cemented carbide powder metallurgical material and method for preparation, wherein the the constituents (by weight percentage) include WC 86-95%, Co 4-8%, Al 1-3%, TiC 0-2%, and VC 0-2%. The preparing process consists of pre-grinding, mixing, ball-grinding, and finally consolidating through electric current flash sintering method.

Description

technical field [0001] The invention relates to plastic forming technology, powder metallurgy technology and rapid forming technology, in particular to a low-cost and high-performance tungsten carbide-based cemented carbide powder metallurgy material and a preparation method thereof. Background technique [0002] The existing tungsten carbide-based cemented carbide materials are mainly composed of matrix tungsten carbide and cobalt as a binder, and are mainly prepared by pre-forming and radiation heating sintering methods. Due to the shortage of cobalt resources, the raw material cost price is high; the radiation heating sintering method has long time, high energy consumption, and high sintering temperature, the obtained sintered material has a coarser structure, and the performance of the sintered material is low; The existence of sintering pressure makes it difficult to control the dimensional accuracy of sintered materials, which limits the applicatio...

Claims

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Application Information

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IPC IPC(8): B22F1/00
Inventor 李元元李小强龙雁邵明陈维平
Owner SOUTH CHINA UNIV OF TECH
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