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Bicrystal cemented carbide and preparation method thereof

A hard alloy and metal technology, applied in the field of double crystal hard alloy and its preparation, can solve the problems of easy and rapid grain growth, lack of corrosion resistance of double crystal hard alloy, and affecting the performance of double crystal hard alloy. Achieve high strength, reduce the production of rare earth polymers, and high toughness

Inactive Publication Date: 2017-10-20
HENGDIAN GRP DMEGC MAGNETICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to solve the problem that the crystal grains in the preparation process of twin crystal hard alloys are easy to grow rapidly and affect the performance of twin crystal hard alloys, and there is a lack of twin crystal hard alloys with high corrosion resistance, a kind of high toughness, high Strength, high wear resistance and corrosion-resistant twin crystal hard alloy and preparation method thereof

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  • Bicrystal cemented carbide and preparation method thereof
  • Bicrystal cemented carbide and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] A kind of twin crystal cemented carbide, the raw material includes the following components:

[0033] A 66.1kg mixture of tungsten carbide and tungsten metal with a diameter between 1.5 and 2.0 microns,

[0034] 100.1 kg of mixture B of tungsten carbide and tungsten metal with a diameter between 3.2 and 3.7 microns,

[0035] Cobalt powder accounts for 24.6kg,

[0036] Chromium carbide powder 2.5kg

[0037] Cerium oxide powder 0.4kg.

[0038] Take following preparation method when preparing above-mentioned a kind of twin crystal cemented carbide:

[0039] (1) Mix 844.71kg tungsten powder with 55.92kg carbon black, and obtain a mixture of tungsten carbide and tungsten metal after carbonization;

[0040] (2) sieving the mixture of tungsten carbide and tungsten metal to obtain mixture A and mixture B;

[0041] (3) take mixture A66.1kg and cobalt powder 24.6kg, chromium carbide powder 2.5kg, 0.4kg of cerium oxide powder mixes batching, obtains composite powder;

[0042...

Embodiment 2

[0046] A kind of twin crystal cemented carbide, the raw material includes the following components:

[0047] A mixture of tungsten carbide and tungsten metal with a diameter between 1.5 and 2.0 microns A60.9kg,

[0048] Tungsten carbide and tungsten metal mixture B113.1kg with a diameter between 3.2 and 3.7 microns,

[0049] Cobalt powder accounts for 23.6kg,

[0050] Chromium carbide powder 2.4kg

[0051] Cerium oxide powder 0.3kg.

[0052] Take following preparation method when preparing above-mentioned a kind of twin crystal cemented carbide:

[0053] (1) Mix 844.71kg tungsten powder with 55.92kg carbon black, and obtain a mixture of tungsten carbide and tungsten metal after carbonization;

[0054](2) sieving the mixture of tungsten carbide and tungsten metal to obtain mixture A and mixture B;

[0055] (3) take by weighing mixture A113.1kg and cobalt powder 23.6kg, chromium carbide powder 2.4kg, cerium oxide powder 0.4kg carries out mixed batching, obtains composite po...

Embodiment 3

[0060] A kind of twin crystal cemented carbide, the raw material includes the following components:

[0061] A 69.6kg mixture of tungsten carbide and tungsten metal with a diameter between 1.5 and 2.0 microns,

[0062] Tungsten carbide and tungsten metal mixture B100.2kg with a diameter between 3.2 and 3.7 microns,

[0063] Cobalt powder accounts for 25.8kg,

[0064] Chromium carbide powder 2.9kg

[0065] Cerium oxide powder 0.5kg.

[0066] Take following preparation method when preparing above-mentioned a kind of twin crystal cemented carbide:

[0067] (1) Mix 844.71kg tungsten powder with 55.92kg carbon black, and obtain a mixture of tungsten carbide and tungsten metal after carbonization;

[0068] (2) sieving the mixture of tungsten carbide and tungsten metal to obtain mixture A and mixture B;

[0069] (3) take by weighing mixture A69.6kg and cobalt powder 25.8kg, chromium carbide powder 2.9kg, cerium oxide powder 0.5kg carries out mixed batching, obtains composite pow...

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Abstract

The invention relates to the technical field of cemented carbide. A bicrystal cemented carbide comprises, by weight, 25-35% of mixtures A of tungsten carbide and tungsten metal with the diameter of 1.5-2.0 [mu]m, 50-60% of mixtures B of the tungsten carbide and the tungsten metal with the diameter of 3.2-3.7 [mu]m, 10-13% of cobalt powder, 0.8-1.5% of chromium carbide powder and 0.15-0.5% of rare earth oxide powder. The invention also provides a preparation method of the bicrystal cemented carbide. The preparation method comprises the steps of mixing excessive tungsten powder and carbon black to obtain the mixtures of the tungsten carbide and the tungsten metal after carbonization; screening the mixtures of the tungsten carbide and the tungsten metal, and then compounding and ball-milling the mixtures to obtain ball-milled products after drying; compression molding of the ball-milled products to obtain blanks; and sintering the blanks to obtain products after cooling. The bicrystal cemented carbide provided by the invention is high in toughness, strength, abrasion resistance and corrosion resistance.

Description

technical field [0001] The invention relates to the technical field of cemented carbide, in particular to a twin crystal cemented carbide and a preparation method thereof. Background technique [0002] WC-Co cemented carbide is widely used in cutting tools, moulds, mining tools and wear-resistant parts due to its high hardness, wear resistance and transverse fracture strength. Generally speaking, the preparation of cemented carbide with high hardness and high wear resistance basically meets the requirements by sacrificing the fracture toughness of the cemented carbide. Usually, the finer the structure of the alloy, the higher the hardness and the better the wear resistance; and The strength decreases, the brittleness increases, and the welding performance deteriorates. On the contrary, the thicker the structure of the alloy, the higher the bending strength and the better the impact resistance, while the wear resistance and hardness will decrease accordingly. During the use...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C29/02C22C1/05B22F9/04
CPCC22C29/02B22F9/04B22F2009/043C22C1/051
Inventor 裘利铭
Owner HENGDIAN GRP DMEGC MAGNETICS CO LTD
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