Microwave vacuum sintering method of ultra-fine grain hard alloy and hard alloy products

A cemented carbide and microwave vacuum technology, applied in the field of cemented carbide manufacturing, can solve the problem of microwave sintering without ultra-fine grained cemented carbide, difficult to obtain ultra-fine grained cemented carbide, long sintering time and holding time, etc. problem, to achieve the effect of fine and uniform metallographic microstructure, uniform distribution of cobalt phase, and good wear resistance

Active Publication Date: 2020-11-13
河南荣泰耐火材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Conventional sintering relies on the heating element to transfer heat through convection, conduction, radiation, etc. The material is heated from the outside to the inside, the sintering time and holding time are relatively long, the grains are easier to grow, and it is difficult to obtain ultra-fine grain cemented carbide; cemented carbide The contradiction between hardness and strength, toughness and wear resistance is difficult to effectively solve and improve at the same time
[0003] In addition, the existing microwave sintering methods are all aimed at the sintering of cemented carbide with large grains, and there is no microwave sintering of ultra-fine grained cemented carbide.

Method used

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  • Microwave vacuum sintering method of ultra-fine grain hard alloy and hard alloy products
  • Microwave vacuum sintering method of ultra-fine grain hard alloy and hard alloy products
  • Microwave vacuum sintering method of ultra-fine grain hard alloy and hard alloy products

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Effect test

Embodiment 1

[0080] A microwave vacuum sintering method for ultra-fine-grain cemented carbide, comprising the following steps:

[0081] (1) The cemented carbide is an ultra-fine-grained cemented carbide, and the mass percent of its components is: WC powder 88, Co powder 12%, wherein the WC Fischer particle size is 0.3~0.4 microns, and the Co powder Fischer particle size 0.6 to 1.0 microns.

[0082] (2) The raw materials are mixed in proportion, ball milled, mixed with paraffin molding agent and pressed into shape, and then put into a microwave vacuum sintering furnace for sintering.

[0083] (3) The microwave vacuum sintering furnace is produced intermittently, with a total power of 100 kilowatts. The microwave power is continuously adjustable. The microwave frequency is 2450 MHz. Vacuum protection or inert gas is used. Air-cooled rapid cooling cooling.

[0084] (4) The sintering process is divided into four stages: inert gas positive pressure dewaxing, vacuum degassing solid-phase sinte...

Embodiment 2

[0092] A microwave vacuum sintering method for ultra-fine-grain cemented carbide, comprising the following steps:

[0093] (1) The cemented carbide is an ultra-fine-grain cemented carbide, and the mass percent of its components is: WC powder 88%, Co powder 12%, wherein WC Fisherman's grain size is 0.5~0.6 micron, Co powder Fisherman's The particle size is 0.6-1.0 microns.

[0094] (2) The raw materials are mixed in proportion, ball milled, mixed with paraffin molding agent and pressed into shape, and then put into a microwave vacuum sintering furnace for sintering.

[0095] (3) The microwave vacuum sintering furnace is produced intermittently, with a total power of 100 kilowatts. The microwave power is continuously adjustable. The microwave frequency is 2450 MHz. Vacuum protection or inert gas is used. Air-cooled rapid cooling cooling.

[0096](4) The sintering process is divided into four stages: inert gas positive pressure dewaxing, vacuum degassing solid-phase sintering, ...

Embodiment 3

[0103] A microwave vacuum sintering method for ultra-fine-grain cemented carbide, comprising the following steps:

[0104] (1) The cemented carbide is an ultra-fine-grain cemented carbide, and the mass percent of its components is: WC powder 90%, Co powder 10%, wherein WC Fisherman's grain size is 0.3~0.4 microns, Co powder Fisherman's The particle size is 0.6-1.0 microns.

[0105] (2) The raw materials are mixed in proportion, ball milled, mixed with paraffin molding agent and pressed into shape, and then put into a microwave vacuum sintering furnace for sintering.

[0106] (3) The microwave vacuum sintering furnace is produced intermittently, with a total power of 100 kilowatts. The microwave power is continuously adjustable. The microwave frequency is 2450 MHz. Vacuum protection or inert gas is used. Air-cooled rapid cooling cooling.

[0107] (4) The sintering process is divided into four stages: inert gas positive pressure dewaxing, vacuum degassing solid-phase sintering...

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Abstract

The invention provides a microwave vacuum sintering method of ultra-fine grain hard alloy and hard alloy products and relates to the technical field of hard alloy manufacturing. The ultra-fine grain hard alloy raw material comprises the following components in percentage by mass, including 88-92% of WC powder and 8-12% of Co powder, wherein the Fisher particle size of the WC powder is 0.3-0.6 microns, and the Fisher particle size of the Co powder is 0.6-1.0 microns; and the microwave vacuum sintering comprises four stages of inert gas positive pressure dewaxing, vacuum degassing solid phase sintering, high temperature vacuum liquid phase sintering and cooling. The hard alloy products subjected to the microwave vacuum sintering have the advantages of consistent hardness distribution, finerWC crystal grains, more uniform microstructure, good magnetic property, high density, low porosity, excellent mechanical property and chemical corrosion resistance.

Description

technical field [0001] The invention relates to the technical field of hard alloy manufacture, in particular to a microwave vacuum sintering method of ultrafine grain hard alloy and hard alloy products. Background technique [0002] At present, the production of ultra-fine-grained cemented carbide at home and abroad is sintered by conventional traditional sintering furnaces. Conventional sintering relies on the heating element to transfer heat through convection, conduction, radiation, etc. The material is heated from the outside to the inside, the sintering time and holding time are relatively long, the grains are easier to grow, and it is difficult to obtain ultra-fine grain cemented carbide; cemented carbide The contradiction between hardness and strength, toughness and wear resistance is difficult to effectively solve and improve at the same time. [0003] In addition, the existing microwave sintering methods are all aimed at the sintering of cemented carbide with large...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/05C22C29/08B22F3/105
CPCB22F3/105B22F2003/1054C22C1/051C22C29/067C22C29/08
Inventor 邵丹
Owner 河南荣泰耐火材料有限公司
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