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Double-crystal hard alloy and preparation method thereof

A cemented carbide and grain technology, applied in the field of cemented carbide, can solve the problems of adverse effects on the performance of the alloy and the inability to eliminate the agglomeration of WC grains, and achieve complete grain crystallization, less grain defects, and narrow particle size distribution. Effect

Inactive Publication Date: 2020-05-22
ZHUZHOU HARD ALLOY GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the WC grain agglomeration and W 2 Phase C cannot be eliminated, and it will have an adverse effect on the performance of the alloy during use

Method used

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  • Double-crystal hard alloy and preparation method thereof
  • Double-crystal hard alloy and preparation method thereof
  • Double-crystal hard alloy and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] The first tungsten carbide powder with an average particle size of 10 μm is classified by the airflow classification method to obtain the second single crystal tungsten carbide powder with an average particle size of 3 μm; the particle size of 60wt% of the total weight of the WC powder is first calculated by using a ball-to-material ratio of 10. The first WC powder of 10 μm is carried out intensive ball milling, ball milling 30 hours; Then add the second WC powder that accounts for 40wt% of WC powder gross weight and be the second WC powder of 3 μm and account for raw material (comprising the first WC powder, the second WC powder and Co powder) Co powder with a total weight of 12wt% is ball milled for 6 hours before unloading, and then granulated---pressed---sintered at 1480°C for 1.5h to obtain a structure with uniform distribution of 1.6-2.0μm and 5-10μm tungsten carbide grains Structure, denoted as WC-12wt% Co, the hardness of the twin crystal cemented carbide prepare...

Embodiment 2

[0044] The first tungsten carbide powder with an average particle size of 10 μm is classified by the airflow classification method to obtain the second single crystal tungsten carbide powder with an average particle size of 5 μm; the particle size of 70wt% of the total weight of the WC powder is first calculated by using a ball-to-material ratio of 12. The first WC powder of 10 μm is carried out intensive ball milling, and ball milling is 39 hours; Then add the second WC powder that accounts for 30wt% of WC powder gross weight and be the second WC powder of 5 μm and account for raw material (comprising the first WC powder, the second WC powder and Co powder) Co powder with a total weight of 16wt% is ball milled for 10 hours before unloading, then granulated --- pressed --- sintered at 1450 ° C for 2.0 hours to obtain a structure with uniform distribution of tungsten carbide grains of 1.6-2.0 μm and 5-10 μm The structure is denoted as WC-16wt% Co, and the hardness of the twin cr...

Embodiment 3

[0048] The first tungsten carbide powder with an average particle size of 10 μm is classified by the airflow classification method, and the second single crystal tungsten carbide powder with an average particle size of 7 μm is obtained; the particle size of 80wt% of the total weight of the WC powder is first obtained by using a ball-to-material ratio of 15. The first WC powder of 20 μm is carried out intensive ball milling, ball milling 48 hours; Then add the second WC powder that accounts for 20wt% of WC powder gross weight and be the second WC powder of 7 μm and account for raw material (comprising first WC powder, the second WC powder and Co powder) Co powder with a total weight of 8wt% is ball milled for 14 hours before unloading, and then granulated---pressed---sintered at 1520°C for 0.5h to obtain a structure with uniform distribution of 1.6-2.0μm and 5-10μm tungsten carbide grains Structure, denoted as WC-8wt% Co, the hardness of the twin crystal cemented carbide prepare...

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Abstract

The invention discloses a double-crystal hard alloy. The double-crystal hard alloy comprises tungsten carbide grains with particle sizes ranging from 1.6 micrometers to 2.0 micrometers and from 5 micrometers to 10 micrometers. The tungsten carbide grains comprise, by weight, 60-80% of the tungsten carbide grains with particle sizes ranging from 1.6 micrometers to 2.0 micrometers and the balance ofthe tungsten carbide grains with particle sizes ranging from 5 micrometers to 10 micrometers. The preparation method of the double-crystal hard alloy comprises the following steps of S1, grinding first tungsten carbide powder with the particle sizes ranging from 10 micrometers to 20 micrometers to obtain a first material; S2, mixing the first material, second tungsten carbide powder with the particle sizes ranging from 3 micrometers to 7 micrometers and cobalt powder for grinding treatment to obtain a mixture; and S3, granulating, pressing and sintering the mixture to obtain the double-crystal hard alloy. The double-crystal hard alloy can meet use requirements of machining, mold manufacturing and the like, and solves the contradiction problems that the high fracture toughness and the highhardness of a coarse grain WC-Co hard alloy are difficult to exist at the same time.

Description

technical field [0001] The invention relates to a twin-crystal hard alloy and a preparation method thereof, belonging to the technical field of hard alloys. Background technique [0002] In order to meet the requirements of machining, mold manufacturing, etc., and solve the contradiction between high fracture toughness and high hardness of coarse-grained WC–Co cemented carbide, twin-crystal cemented carbide is often used to solve this contradiction, that is, Coarse-grained WC ensures the toughness of the alloy, and fine-grained WC ensures the wear resistance of the alloy to obtain a coarse-grained WC–Co cemented carbide with excellent comprehensive properties. Such as China's patent application - a preparation method of cemented carbide material "(application publication number CN102071347A, application publication date May 25, 2011) discloses a production method of cemented carbide material. Including the following steps, (1) Take the following raw materials in weight perc...

Claims

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Application Information

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IPC IPC(8): C22C29/08C22C1/05
CPCC22C1/051C22C29/067C22C29/08
Inventor 龙坚战陆必志
Owner ZHUZHOU HARD ALLOY GRP CO LTD
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