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Method for improving hardness of TiC-Co hard alloy

A cemented carbide, tic-co technology, applied in the field of powder metallurgy, can solve the problems of poor wear resistance, plasticity, strength, and service life performance of cemented carbide, and achieve the advantages of improving wear resistance, reducing cost, and improving hardness. Effect

Inactive Publication Date: 2019-06-04
祁阳华瑞特种材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the technical problems of poor wear resistance, plasticity, strength, and service life of existing hard alloys, the present invention provides a method for TiC-Co hard alloy hardness; The overall performance of the alloy, especially the hardness

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Step (1): After raising the TiC-Co cemented carbide from room temperature to 500°C at a rate of 3°C / min in 1,2-butanediol atmosphere, keep it warm for 30 minutes, and then increase the temperature at a rate of 2°C / min After rising to 1250°C, keep warm for 40 minutes; among them, the feeding rate of 1,2-butanediol is 128 drops / min,

[0024] Step (2): Then pass liquid nitrogen for rapid cooling treatment, until 230 ° C, pass nitrogen or argon for 30 minutes, and then naturally cool to room temperature to prepare heat-treated TiC-Co cemented carbide.

[0025] Result after testing: The density of YG06 product after heat treatment is 14.68g / cm 3 , hardness 93.5HRA.

Embodiment 2

[0027] Step (1): After raising the TiC-Co cemented carbide from room temperature to 500°C at a rate of 3°C / min in 1,2-butanediol atmosphere, keep it warm for 30 minutes, and then increase the temperature at a rate of 2°C / min After rising to 1250°C, keep warm for 40 minutes; among them, the feeding rate of 1,2-butanediol is 128 drops / min,

[0028] Step (2): Then pass liquid nitrogen for rapid cooling treatment, until 230 ° C, pass nitrogen or argon for 30 minutes, and then naturally cool to room temperature to prepare heat-treated TiC-Co cemented carbide.

[0029] Result after testing: The density of YG08 product after heat treatment is 15.18g / cm 3 , hardness 94.1HRA.

Embodiment 3

[0031] Step (1): After raising the TiC-Co cemented carbide from room temperature to 500°C at a rate of 3°C / min in 1,2-butanediol atmosphere, keep it warm for 30 minutes, and then increase the temperature at a rate of 2°C / min After rising to 1250°C, keep warm for 40 minutes; among them, the feeding rate of 1,2-butanediol is 128 drops / min,

[0032] Step (2): Then pass liquid nitrogen for rapid cooling treatment, until 230 ° C, pass nitrogen or argon for 30 minutes, and then naturally cool to room temperature to prepare heat-treated TiC-Co cemented carbide.

[0033] Result after testing: The density of YG10 product after heat treatment is 15.24g / cm 3 , hardness 91.9HRA.

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Abstract

The invention relates to the field of powder metallurgy, and particularly provides a method for improving the hardness of a TiC-Co hard alloy. The method includes the steps that 1,2-butanediol is added into the TiC-Co hard alloy at the adding speed of 120-140 drops / min, and then the mixture is successively subjected to one-step heat treatment andtwo-step heat treatment, wherein one-step heat treatment refers to heat preservation for 20-40 min under 600-650 DEG C, and the two-step heat treatment refers to heat preservation for 30-50 min under 1000-1200 DEG C; then the product is cooled throughliquid nitrogen to 280-320 DEG C, and subjected to heat preservation for 25-35 min; and then the heat treatedTiC-Co hard alloy is prepared after natural cooling. Heat treatment and quenching treatmentare conducted through the method for improving the hardness of the TiC-Co hard alloy, the prepared TiC-Co hard alloy has good wear resistance and toughness, the service life of the alloy is greatly prolonged, and the cost is lowered.

Description

technical field [0001] The invention relates to the field of powder metallurgy, in particular to a method for hardness of TiC-Co cemented carbide. Background technique [0002] The essence of heat treatment of cemented carbide is to heat the sintered cemented carbide to above 1000°C and then quench it. Because in the sintering process of cemented carbide, the solubility of tungsten in cobalt increases with the increase of sintering temperature, and in the process of slow cooling, tungsten dissolved in the cobalt binder phase is precipitated from it, reducing its content. , leading to a decrease in wear resistance and strength of the alloy, and a decrease in performance. According to reports by American scholars, the maximum soluble amount of tungsten in the cobalt binder phase is up to 23%. If the alloy is rapidly cooled (that is, quenched) when the tungsten dissolves at 1000°C and reaches saturation, the tungsten dissolved in the binder phase at high temperature has no ti...

Claims

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Application Information

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IPC IPC(8): C22F1/00
Inventor 郭国华
Owner 祁阳华瑞特种材料有限公司
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