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Cemented carbide for composite matrix and preparation method of cemented carbide

A cemented carbide and matrix technology, which is applied in the field of cemented carbide for composite matrix and its preparation, can solve the problems of poor matching between strength and microhardness, poor impact resistance and thermal plastic deformation resistance, low high-temperature hardness and high-temperature strength, etc. problems, to achieve the effect of superior performance, improved wear resistance and impact toughness, and small microscopic strain

Inactive Publication Date: 2015-04-29
HUNAN CENTURY SPECIAL ALLOY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Bending strength 2600~3000MPa, hardness Hv 30 1150~1320, poor matching between strength and microhardness, low overall performance, especially low high temperature hardness and high temperature strength of the alloy, poor impact resistance and thermal plastic deformation resistance, it is difficult to work continuously in high temperature environment, Greatly restricts the application range of cemented carbide

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] A cemented carbide for a composite matrix, the formulation of which includes a mixture of cobalt powder and tungsten carbide powder, the tungsten carbide powder mixture is a mixture of conventional tungsten carbide powder and cast tungsten carbide powder, and the mass ratio is 36.5:63.5; cobalt powder and carbide The mass ratio of the tungsten powder mixture is 16:84; the tungsten carbide powder adopts conventional tungsten carbide powder with Fsss particle size of 3.0-6.5 μm and cast tungsten carbide powder with Fsss particle size of 10.0-17.5 μm, and the Fsss particle size of cobalt powder is 1.4-6.5 μm. 2.0μm;

[0014] The preparation process steps are as follows: batching, wet milling, spray drying granulation, compression molding and vacuum low pressure integrated sintering; when batching, use wet milling and then spray drying granulation to prepare a mixture; the ball milling medium during wet milling is For the mixture of acetone and n-hexane, the mass ratio of a...

Embodiment 2

[0017] A cemented carbide for a composite matrix, the formulation of which includes a mixture of cobalt powder and tungsten carbide powder, the tungsten carbide powder mixture is a mixture of conventional tungsten carbide powder and cast tungsten carbide powder, and the mass ratio is 34.5:65.5; cobalt powder and carbide The mass ratio of the tungsten powder mixture is 13:87; the conventional tungsten carbide powder with a Fsss particle size of 3.0-6.5 μm and cast tungsten carbide powder with a Fsss particle size of 10.0-17.5 μm are used for the tungsten carbide powder, and the Fsss particle size of the cobalt powder is 1.4-6.5 μm. 2.0μm;

[0018] The preparation process steps are as follows: batching, wet milling, spray drying granulation, compression molding and vacuum low pressure integrated sintering; when batching, use wet milling and then spray drying granulation to prepare a mixture; the ball milling medium during wet milling is For the mixture of acetone and n-hexane, t...

Embodiment 3

[0021] A cemented carbide for a composite matrix, the formula of which includes a mixture of cobalt powder and tungsten carbide powder, the tungsten carbide powder mixture is a mixture of conventional tungsten carbide powder and cast tungsten carbide powder, and the mass ratio is 33:67; cobalt powder and carbide powder The mass ratio of the tungsten powder mixture is 9:91; the tungsten carbide powder is selected from conventional tungsten carbide powder with Fsss particle size of 3.0-6.5 μm and cast tungsten carbide powder with Fsss particle size of 10.0-17.5 μm, and the Fsss particle size of cobalt powder is 1.4- 2.0μm;

[0022] The preparation process steps are as follows: batching, wet milling, spray drying granulation, compression molding and vacuum low pressure integrated sintering; when batching, use wet milling and then spray drying granulation to prepare a mixture; the ball milling medium during wet milling is For the mixture of acetone and n-hexane, the mass ratio of ...

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Abstract

The invention discloses cemented carbide for a composite matrix and a preparation method of the cemented carbide. According to a formula, a WC (wolfram carbide) powder mixture is a mixture of conventional WC powder and cast WC powder whose mass ratio is (33-40) : (60-67); the mass ratio of cobalt powder and the WC powder mixture is (8-17) : (83-92); the preparation process comprises steps as follows: material preparation, wet grinding, dry granulation, press forming and low-pressure vacuum integrated sintering. The average WC grain size of the cemented carbide prepared with the preparation method according to the formula is 2.0-3.2 microns, the bending strength is 3,200-3,400 MPa, and the hardness is HRA 85.0-90.8.

Description

technical field [0001] The invention relates to a cemented carbide and a preparation method thereof, in particular to a cemented carbide for a composite matrix and a preparation method thereof. Background technique [0002] With the continuous development of the cemented carbide industry, the use of cemented carbide is becoming more and more extensive. The new polycrystalline diamond compact sheet PDC (Polycrystalline Diamond Compact, PDC for short) drilling drill bit developed in recent years uses a composite sheet made of polycrystalline diamond as its cutting teeth. PDC is a layer of diamond powder sintered on the cemented carbide. This composite sheet not only has the characteristics of high diamond hardness and good wear resistance, but also has the advantages of excellent toughness and good machinability of cemented carbide. Composite diamond drill bits have sharp cutting edges and have extremely high wear resistance and impact toughness, so they are widely used in co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C29/08C22C1/05
CPCC22C29/08C22C1/051
Inventor 肖华单水桃周汉凡
Owner HUNAN CENTURY SPECIAL ALLOY
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