Sintering method of wear-resistant and corrosion-resistant superfine hard alloy

A technology of cemented carbide and sintering method, applied in the field of powder metallurgy, can solve the problems of cobalt segregation defects in microscopic pores, and achieve the effects of good uniformity of structure, increased hardness and size reduction

Inactive Publication Date: 2021-08-31
ZHUZHOU HARD ALLOY GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a sintering method of wear-resistant and corrosion-resistant ultrafine cemented carbide, which solves the problems of microscopic pores and cobalt segregation defects in the sintering process of cemented carbide compacts existing in the prior art

Method used

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  • Sintering method of wear-resistant and corrosion-resistant superfine hard alloy

Examples

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Effect test

Embodiment 1

[0026] A sintering method for wear-resistant and corrosion-resistant ultrafine cemented carbide, which specifically comprises the following steps:

[0027] Step S1: 4.0% of cobalt powder, 2.0% of paraffin wax, 0.4% of chromium carbide, and tungsten carbide powder with a Fischer particle size of 0.4 μm are added according to mass percentages, mixed, ball-milled, and pressed into a cemented carbide compact, wherein Cobalt powder is the binder phase;

[0028] Step S2: Put the cemented carbide compacts into the pressure sintering furnace, and the pressure is 1.03×10 5 In a hydrogen atmosphere of Pa, dewaxing was carried out by heating from room temperature to 380 °C and holding for 280 min;

[0029] Step S3: under vacuum conditions, the temperature is raised to 1260°C at a heating rate of 8°C / min, and kept at 1260°C for 25 minutes, and then heated to 1.0×10 in the sintering furnace. 5 The pressurization rate of Pa / min is filled with argon, and the maximum pressure is 70.0×10 5 ...

Embodiment 2

[0036] A sintering method for wear-resistant and corrosion-resistant ultrafine cemented carbide, which specifically comprises the following steps:

[0037]Step S1: 6.0% of cobalt powder, 2.1% of paraffin wax, 0.1% of chromium carbide and tungsten carbide powder with a Fischer particle size of 0.6 μm are supplemented according to the mass percentage, mixed, ball-milled, and a cemented carbide green compact is prepared by molding, wherein Cobalt powder is the binder phase;

[0038] Step S2: Put the cemented carbide green compacts into the pressure sintering furnace, and the pressure is 1.04×10 5 In the hydrogen atmosphere of Pa, dewaxing was carried out by heating from room temperature to 400 °C and holding for 300 min;

[0039] Step S3: under vacuum conditions, the temperature is raised to 1250°C at a heating rate of 10°C / min, and the temperature is kept at 1250°C for 15 min. 5 The pressurization rate of Pa / min is filled with argon, and the maximum pressure is 75.0×10 5 Pa, ...

Embodiment 3

[0045] A sintering method for wear-resistant and corrosion-resistant ultrafine cemented carbide, which specifically comprises the following steps:

[0046] Step S1: 5.0% of cobalt powder, 2.2% of polyethylene glycol, 0.3% of chromium carbide and tungsten carbide powder with a Fischer particle size of 0.8 μm are added according to the mass percentage, mixed, ball-milled, and the cemented carbide press is prepared by molding. A blank, wherein the cobalt powder is the binder phase;

[0047] Step S2: Put the cemented carbide green compacts into the pressure sintering furnace, and the pressure is 1.04×10 5 In the hydrogen atmosphere of Pa, the temperature was raised from room temperature to 450°C and kept for 360min to remove polyethylene glycol;

[0048] Step S3: under vacuum conditions, the temperature is raised to 1300°C at a heating rate of 5°C / min, and the temperature is kept at 1300°C for 20 minutes, and then the temperature is 2.0×10 in the sintering furnace. 5 The pressur...

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Abstract

The invention discloses a sintering method of a wear-resistant and corrosion-resistant superfine hard alloy. The sintering method comprises the following steps that wet grinding and spray drying are conducted on tungsten carbide powder, cobalt powder, a forming agent and an inhibitor, and forming is conducted to prepare a pressed blank; the forming agent is removed from the pressed blank in a hydrogen atmosphere at 340 DEG C-450 DEG C; and the pressed blank is sintered in three steps, in the first step, the temperature is increased to 1200 DEG C-1300 DEG C under the vacuum condition at the temperature increasing speed of 5 DEG C / min-10 DEG C / min, then heat preservation is conducted, in the second step, the temperature is increased to 1350 DEG C-1450 DEG C in protective gas at the temperature increasing speed of 2 DEG C / min-2.5 DEG C / min, in the third step, sintering is conducted under the maximum pressure of the protective gas, then the protective gas is released for cooling, and therefore the superfine hard alloy is obtained. By means of the sintering method, the micro defects of products can be reduced, the abrasion resistance and corrosion resistance of the superfine hard alloy are enhanced, the service life of the superfine hard alloy products is prolonged, and good application prospects are achieved.

Description

technical field [0001] The invention belongs to the technical field of powder metallurgy, and in particular relates to a sintering method for wear-resistant and corrosion-resistant ultrafine cemented carbide. Background technique [0002] Ultrafine cemented carbide materials are widely used in cutting tools, drilling tools and wear-resistant parts due to their excellent comprehensive mechanical properties such as hardness, bending strength and fracture toughness. With the rapid development of the electronics industry, aerospace industry, new energy and home furnishing industries in recent years, new characteristics have emerged in the practical application of ultrafine cemented carbide: (1) The processed material is a composite material composed of metal and organic materials , this composite material will release corrosive organic acids or organic bases during processing; (2) it requires efficient processing, high processing speed and high feed rate; (3) there is no cooling...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/05C22C29/08B22F1/00B22F3/10B22F9/04
CPCC22C1/051B22F9/04B22F3/1021C22C29/067C22C29/08B22F1/10
Inventor 傅上龙宁华曾瑞霖
Owner ZHUZHOU HARD ALLOY GRP CO LTD
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