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Process for preparing heterogeneous cemented carbide

A cemented carbide and non-uniform technology, applied in the field of preparation of non-uniform cemented carbide, can solve the problems of not fully meeting the requirements of snowplows, high operating costs, short service life, etc., achieve high hardness and improve service life , The effect of using the mission to improve

Inactive Publication Date: 2004-11-10
ZHUZHOU HARD ALLOY GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, a cemented carbide snow shovel with a Co content of 10-11.5% prepared by 11 μm WC has a hardness of 86.5HRA and a flexural strength of only 2260 MPa, especially low hardness and no wear resistance; the other is prepared by 7 μm WC Hard alloy snow shovel flakes with a Co content of 9.8-10.2% have a hardness of 87HRA and a flexural strength of 2420MPa, but their strength is still low and they are easily broken during use. Questions about the requirements for the use of snowmobiles

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0007] Embodiment 1: preparation weight ratio is Co11%, WC48% of 9.04 μ m, 1.0 μ m of WC41% compound 220kg, prepared compound is in 180 liters of ball mills, carries out wet milling with alcohol as medium, ball-to-material ratio It is 5.0:1, the liquid-solid ratio is 460ml / kg, the speed of the ball mill is 34r / min, and the grinding time is 34 hours. After the grinding material is dried and pressed, it is sintered in an ordinary vacuum furnace. ), the vacuum degree is 10-300Pa. The properties of the finished alloy are: hardness 88.5HRA, bending strength 3100MPa, WC average grain size 2.0μm, density 14.25g / cm 3 .

Embodiment 2

[0008] Embodiment 2: preparation weight ratio is Co11.3%, WC46% of 11 μ m, 1.1 μ m of WC 42.7% compound 220kg, the compound compound prepared is in 180 liters of ball mills, carries out wet milling with alcohol as medium, ball The material ratio is 4.9:1, the liquid-solid ratio is 480ml / kg, the rotating speed of the ball mill is 36r / min, and the grinding time is 35 hours. The grinding material is sintered in an ordinary vacuum furnace after being dried and pressed, and the sintering temperature is 1410°C (heat preservation 50 minutes), the vacuum degree is 10-300Pa. The properties of the finished alloy are: hardness 88.3HRA, bending strength 3400MPa, WC average grain size 2.0μm, density 14.20g / cm 3 .

Embodiment 3

[0009] Embodiment 3: preparation weight ratio is Co11.5%, WC45.3% of 12 μ m, 1.2 μ m of WC43.2% compound 220kg, the compound compound prepared is in 180 liters of ball mills, carries out wet with alcohol as medium Grinding, the ball-to-material ratio is 5.2:1, the liquid-solid ratio is 500ml / kg, the speed of the ball mill is 38r / min, and the grinding time is 36 hours. After the grinding material is dried and pressed, it is sintered in an ordinary vacuum furnace, and the sintering temperature is 1410 ℃ (50 minutes of heat preservation), the degree of vacuum is 10-300Pa. The properties of the finished alloy are: hardness 88.0HRA, bending strength 3500MPa, WC average grain size 2.4μm, density 14.15g / cm 3 .

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Abstract

The invention advances a nonuniform hard alloy preparing method, when batching, preparing mixed material by the raw materials in weight percent: Co 11-12%, 9.01-13mum WC 44-48% and 1.0-1.2mum WC 41-44%, making wet milling on the mixed material in ball-material ratio of 4.8-5.3 to 1 and liquid-solid ratio of 450-510ml / g for 34-36h, drying and compress-molding, and then making vacuum sintering at vacuum 10-300Pa at sintering temperature 1400-1420deg.C, to prepare high-strength high-hardness nonuniform structural hard alloy alloy. The prepared hard alloy snow perching piece by this method has hardness at 88.0HRA, and bending strength at above 3000MPa, and service life prolonged by 20% above in comparison with snow perching pieces prepared by existing techniques.

Description

technical field [0001] The invention relates to the preparation of heterogeneous hard alloy, especially the preparation of high-strength and high-hardness heterogeneous hard alloy. Background technique [0002] Cemented carbide is a widely used tool material and wear-resistant material because of its high strength, high hardness and good wear resistance. However, the common technical problem encountered in the preparation of cemented carbide is that it is difficult to achieve high strength and high hardness simultaneously. When it has high strength, it often has low hardness and poor wear resistance; when it has high hardness, it often has low strength and poor toughness. How to achieve simultaneous realization of high strength and high hardness as much as possible to meet the special needs of various construction machinery and rock drilling tools has always been the main content of cemented carbide development. Europe and the United States have well-developed road traffic,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/04C22C29/08
Inventor 王力民彭英健唐穗良
Owner ZHUZHOU HARD ALLOY GRP CO LTD
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