Method for preparing extra-coarse grained carbide alloy

A hard alloy and coarse-grained technology, which is applied in the field of metal materials, can solve the problems of grinding alloys that are not ultra-coarse grains, and achieve the effect of improving toughness and wear resistance and making raw materials easy to obtain

Inactive Publication Date: 2010-09-08
SHANDONG CEMENTED CARBIDE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, judging from the specific content of this article, the

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Example 1: Premix ultra-coarse tungsten carbide powder and cobalt powder with a Fischer particle size greater than 6 μm in the ground state, and after adding a molding agent, press the powder into agglomerates and put them into a degumming furnace with ammonia decomposition gas for pre-sintering; Put the pre-sintered tungsten carbide-cobalt agglomerate together with tungsten carbide powder and cobalt powder into a ball mill for crushing and wet grinding; the prepared mixture containing 6-13% cobalt is added with a molding agent and pressed into a product, and re- After degumming, it is sintered in a pressure sintering furnace at a high temperature, and the temperature is controlled at 1430-1480°C; the sintered product is then heat-treated in a double-chamber high-pressure air-cooled vacuum furnace. The weight ratio of the premixed tungsten carbide powder and cobalt powder is: 91.5 parts of tungsten carbide powder, 8.5 parts of cobalt powder, and 2.5 parts of forming agen...

Embodiment 2

[0017] Example 2: Premix ultra-coarse tungsten carbide powder and cobalt powder with a Fischer particle size greater than 6 μm in the ground state, and after adding the molding agent, press the powder into agglomerates, put it into a degumming furnace with ammonia decomposition gas for pre-sintering, The pre-sintering temperature is 630-820°C, solid-phase diffusion of cobalt and tungsten carbide, strong coating force, part of the residual carbon is conducive to sintering densification, reducing porosity, so that the toughness of cemented carbide is improved and wear-resistant Reinforcement; put the pre-sintered tungsten carbide-cobalt agglomerate together with tungsten carbide powder and cobalt powder into a ball mill for crushing and wet grinding; the prepared mixture containing 6-13% cobalt is added with a molding agent and then pressed into The product is sintered at high temperature in a pressure sintering furnace after re-degumming, and the temperature is controlled at 143...

Embodiment 3

[0018] Example 3: Premix ultra-coarse tungsten carbide powder and cobalt powder with a Fischer particle size greater than 6 μm in the ground state, and after adding a molding agent, press the powder into agglomerates and put them into a degumming furnace with ammonia decomposition gas for pre-sintering; Put the pre-sintered tungsten carbide-cobalt agglomerate together with tungsten carbide powder and cobalt powder into a ball mill for crushing and wet grinding; the prepared mixture containing 6-13% cobalt is added with a molding agent and pressed into a product, and re- After degumming, it is sintered at high temperature in a pressure sintering furnace, and the temperature is controlled at 1430-1480°C; the sintered product is then heat-treated in a double-chamber high-pressure air-cooled vacuum furnace, and the heat treatment temperature of the vacuum furnace is 1320-1430°C. Grindability can be further improved. The weight ratio of the premixed tungsten carbide powder and coba...

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Abstract

The invention discloses a method for preparing an extra-coarse grained carbide alloy. The method is characterized by comprising the following steps of: pre-mixing extra-coarse tungsten carbide powder having a grinding Fisher particle size of over 6 mu m and cobalt powder; adding molding agents and pressing the mixture to form lumps; pre-sintering the lumps in a degumming furnace having ammonia decomposition gas therein; placing the obtained product, the tungsten carbide powder and the cobalt powder into a ball mill for smashing and wet grinding to prepare a mixture containing 6 to 13 percent cobalt; adding molding agents into the mixture, and pressing to obtain the finished product; after degumming the finished product, sintering the finished product at the high temperature by using a pressurized sintering furnace; and thermally treating the sintered product by using a double-chamber high-pressure gas cooling vacuum furnace, wherein 87 to 94 parts of tungsten carbide, 6 to 13 parts of carbide powder and 0.5 to 2.5 parts of molding agent are pre-mixed. The method avoids the dispersing or grading sieving, and cobalt coating of the tungsten carbide; moreover, the prepared carbide alloy has good compactness, high strength and impact resistance, simple production process and no environment pollution.

Description

technical field [0001] The invention belongs to the technical field of metal materials, and in particular relates to a method for preparing ultra-coarse grain hard alloy. Background technique [0002] Ultra-coarse-grained cemented carbide refers to cemented carbide with an average grain size of tungsten carbide greater than 4.5 μm. The conventional preparation method is to spray and disperse ultra-coarse tungsten carbide powder, classify and sieve, then coat tungsten carbide with cobalt, directly add molding agent without ball milling process, and then press and sinter. [0003] US Patent 5071473 describes a method for ultra-coarse grained cemented carbide. The method adopts the traditional cemented carbide preparation process route. First, tungsten powder with an average particle size greater than 20 μm is obtained by ball milling and sieving. Carbonization, and then the tungsten carbon powder is ball milled and sieved, and then prepared into an alloy with a cobalt conten...

Claims

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Application Information

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IPC IPC(8): C22C29/08C22C1/04
Inventor 杨宣增魏茂和商涛
Owner SHANDONG CEMENTED CARBIDE
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