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YG8 tungsten carbide hard alloy

A cemented carbide and tungsten carbide technology, applied in the field of cemented carbide materials, can solve problems such as increased abrasion, wear, and fragile hard phase skeleton structure, and achieve the effect of improving the erosion wear rate

Inactive Publication Date: 2019-04-23
徐萍
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The bonding phase Co in common WC-Co cemented carbides is easily eroded by chemical media, which makes the hard phase skeleton structure composed of carbides fragile, and the hard phase grains peel off under friction, aggravating abrasion and wear

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment example 1

[0016] The raw materials for the preparation of YG8 tungsten carbide cemented carbide include: YG8 cemented carbide with an average particle size of 149μm quartz sand SiO 2 particles. The preparation steps of YG8 tungsten carbide cemented carbide are as follows: weighing and batching the raw materials according to the experimental design plan, and then pouring them into the cemented carbide ball mill tank for wet grinding. The ball mill medium is carbon tetrachloride, and the ball mill speed is 78r / min, ball milling time is 22h. After the ball milling, the obtained granules were vacuum-dried, the drying time was 60 min, and the drying temperature was 45°C. The particle erosion process is realized by using a self-made shock wave-driven gas-solid two-phase flow erosion and wear experimental device. The driving section, the driven section and the accelerating section are respectively equipped with a dynamic pressure sensor for testing high-speed airflow, a charge amplifier and...

Embodiment example 2

[0018] Under the impact of impact velocity of 180m / s, by changing the impact angle of the specimen, the erosion wear rate of the specimen under different impact angles was obtained, and the erosion wear rate of the specimen increased first with the increase of the angle Then it decreases, and the erosion wear rate reaches its peak value when the impact angle reaches 80°. YG8 is a typical brittle material, and the erosion wear rate of the material reaches the maximum at a large angle. The erosion wear characteristics of YG8 conform to the change characteristics of the erosion wear rate of brittle materials with the impact angle.

Embodiment example 3

[0020] Particle velocity is an important factor affecting the wear rate of materials. Under the three impact velocities of 150m / s, 180m / s, and 221m / s, impact experiments were carried out on specimens with impact angles of 35°, 62°, and 92°. Under the three impact angles, with the increase of the impact velocity, the erosion wear rate of the material increases. There is a critical impact velocity for erosion and wear of materials, which is related to the performance of abrasive grains and the properties of materials, and erosion and wear can only occur when the velocity is greater than the critical velocity.

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PUM

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Abstract

In order to improve hardness and wear resistance of a YG8 hard alloy, a YG8 tungsten carbide hard alloy is prepared. According to the YG8 hard alloy, quartz sand SiO2 particles with average particle size of 150 microns are used as raw materials, and the impact angle of the YG8 tungsten carbide hard alloy has a larger influence on the mechanical property of the hard alloy. The impact angle determines the angle between the particles and a matrix. If the impact angle is too large, the particles and the matrix react excessively, so that the performance loss of the hard alloy is caused. If the impact angle is too small, the particles and the matrix are difficult to generate metallurgical bonding, so that the defect of the hard alloy structure is caused, and the mechanical property is reduced. The hardness, the wear resistance and the erosion wear rate of the prepared YG8 tungsten carbide hard alloy are greatly improved. The invention provides a novel production process for preparing the high-performance YG8 hard alloy.

Description

Technical field [0001] The invention relates to a cemented carbide material, in particular to a YG8 tungsten carbide cemented carbide. Background technique [0002] Cemented carbide in the traditional sense refers to the alloy material obtained by embedding the hard phase WC particles with excellent physical properties into the low-melting binder phase Co and preparing it by powder metallurgy. Cemented carbide is a tool material with high hardness, high strength and high toughness. It is widely used in occasions with severe friction and wear such as cutting tools and bearings. The binder phase Co in common WC-Co cemented carbides is easily eroded by chemical media, which makes the hard phase skeleton structure composed of carbides fragile, and the hard phase grains peel off under friction, which intensifies abrasion and wear. [0003] YG8 is a tungsten-cobalt material. Good wear resistance, better strength and impact toughness than YG6. The drawing die under the condition...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C29/02C22C1/05C22F1/00
CPCC22C29/02C22C1/051C22F1/00
Inventor 徐萍
Owner 徐萍