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

A cemented carbide, tungsten carbide-based technology, applied in the fields of plastic forming technology, powder metallurgy technology and rapid forming, can solve the problems of weakening and the actual mechanical properties of tungsten carbide alloys are not improved, and achieve low porosity, shape and size accuracy. Easy-to-control, thermally efficient effects

Inactive Publication Date: 2008-12-03
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

[0028] Step 1: Composition design of tungsten carbide-based cemented carbide powder

[0029] alloy composition:

[0030] WC: 94.5%,

[0031] Co: 4.0%,

[0032] Al: 1.0%,

[0033] TiC: 0.5%,

[0034] Contains unavoidable trace impurities.

[0035] The WC raw material adopts the WC powder produced by the hydrogen reduction carbonization method of blue tungsten powder. The average particle diameter is about 3 μm, and the crystal grain is about 0.5-0.8 μm; 99.9%; the particle diameter of TiC is about 2-3 μm.

[0036] Step 2: Preparation of cemented carbide powder by high energy ball milling

[0037] All ball milling processes were completed in a planetary ball mill, the ball material was made of WC carbide, the ball-to-material ratio was 10:1, the ball milling speed was 266r / min, and high-purity Ar gas was used as the protective atmosphere.

[0038] First ball mill the WC powder alone for 75 hours, and the WC powder particles reach the nanometer level; then mix Co and Al ac...

Embodiment 2

[0042] Step 1: Composition design of tungsten carbide-based cemented carbide powder

[0043] alloy composition:

[0044] WC: 90.5%,

[0045] CO: 6.0%

[0046] Al: 1.5%,

[0047] TiC: 2.0%,

[0048] Contains unavoidable trace impurities.

[0049] The WC raw material adopts the WC powder produced by the hydrogen reduction carbonization method of blue tungsten powder. The average particle diameter is about 3 μm, and the crystal grain is about 0.5-0.8 μm; 99.9%; the particle diameter of TiC is about 2-3 μm.

[0050] Step 2: Preparation of cemented carbide powder by high energy ball milling

[0051] All ball milling processes were completed in a planetary ball mill, the ball material was made of WC carbide, the ball-to-material ratio was 10:1, the ball milling speed was 266r / min, and high-purity Ar gas was used as the protective atmosphere.

[0052] First, ball mill the WC powder separately for 75 hours, and the WC powder particles reach the nanometer level; then mix Co, Al, a...

Embodiment 3

[0056] Step 1: Composition design of tungsten carbide-based cemented carbide powder

[0057] alloy composition:

[0058] WC: 88.5%,

[0059] Co: 8.0%,

[0060] Al: 2.0%,

[0061] TiC: 0.5%,

[0062] VC: 1.0%,

[0063] Contains unavoidable trace impurities.

[0064] The WC raw material adopts the WC powder produced by the hydrogen reduction carbonization method of the blue tungsten powder. The average particle diameter is about 3 μm, and the crystal grain is about 0.5-0.8 μm; the diameter of the Co and Al elemental powder is about 75 μm, and the purity is greater than 99.9%. The particle diameters of TiC and VC are both about 2-3 μm.

[0065] Step 2: Preparation of cemented carbide powder by high energy ball milling

[0066] All ball milling processes were completed in a planetary ball mill, the ball material was made of WC carbide, the ball-to-material ratio was 10:1, the ball milling speed was 266r / min, and high-purity Ar gas was used as the protective atmosphere.

[...

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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 prototyping technology, in particular to a low-cost and high-performance tungsten carbide-based hard alloy powder metallurgy material and a preparation method thereof. Background technique [0002] The existing tungsten carbide-based hard alloy materials are mainly composed of matrix tungsten carbide and cobalt as a binder phase, and are mainly prepared by preforming and radiation heating sintering. Due to the shortage of cobalt resources, the original cost of materials is high; the radiation heating sintering method takes a long time, consumes a lot of energy, and the sintering temperature is high, so the obtained sintered material has a coarse structure and low performance; In the presence of sintering pressure, it is difficult to control the dimensional accuracy of sintered materials, which limits the application of such materials to a certain extent. [000...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F1/00C22C29/08
Inventor 李元元李小强龙雁邵明陈维平
Owner SOUTH CHINA UNIV OF TECH
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