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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AI-Extracted 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...

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.

Technology Topic

Powder metallurgyHardness +8

Examples

Experimental program(3)
Comparison scheme(4)

Example Embodiment

[0022] Example 1

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

[0024] Step (2): Subsequently, liquid nitrogen is introduced for rapid cooling treatment, and nitrogen or argon is introduced for heat preservation at 230°C for 30 minutes, and then naturally cooled to room temperature to obtain a heat-treated TiC-Co cemented carbide.

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

Example Embodiment

[0026] Example 2

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

[0028] Step (2): Subsequently, liquid nitrogen is introduced for rapid cooling treatment, and nitrogen or argon is introduced for heat preservation at 230°C for 30 minutes, and then naturally cooled to room temperature to obtain a heat-treated TiC-Co cemented carbide.

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

Example Embodiment

[0030] Example 3

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

[0032] Step (2): Subsequently, liquid nitrogen is introduced for rapid cooling treatment, and nitrogen or argon is introduced for heat preservation at 230°C for 30 minutes, and then naturally cooled to room temperature to obtain a heat-treated TiC-Co cemented carbide.

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

PUM

Property	Measurement	Unit
Density	14.68	g/cm³
Density	15.18	g/cm³
Density	15.24	g/cm³

Description & Claims & Application Information

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Classification and recommendation of technical efficacy words

high hardness
Improve wear resistance

Method for improving hardness of TiC-Co hard alloy

AI-Extracted Technical Summary

Problems solved by technology

Abstract

Examples

Example Embodiment

Example Embodiment

Example Embodiment

PUM

Description & Claims & Application Information

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