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Application of titanium silicon carbide to hard alloy

A cemented carbide and alloy technology, applied in the field of powder metallurgy, can solve problems such as energy consumption and grain growth, and achieve the effects of controlling carbon content, improving densification, and enhancing compactness

Inactive Publication Date: 2017-06-13
JIANGXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to reduce the porosity of the material and achieve full densification of the material, it is usually necessary to increase the sintering temperature or prolong the holding time, which not only consumes energy, but also inevitably causes grain growth

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Composition ratio (wt%):

[0015] 1μmTi 3 SiC 2 Powder: 1%, 0.5μm tungsten carbide powder: 93%, 1μm cobalt powder: 6%;

[0016] Wet grinding for 72 hours under the protective atmosphere of argon, the amount of alcohol added is 0.45L / kg; dried in a Z-shaped dryer at 70°C, pressed into a round cake with a diameter of 48mm and a thickness of 20mm, with a pressing force of 42 tons, in argon Carry out 5MPa low-pressure sintering under a protective atmosphere, the sintering temperature is 1380°C, the sintering time is 1 hour, the hydrogen flow rate is 35-45SLM, and the argon flow rate is 40SLM; quenching is carried out in a vacuum environment, the quenching temperature is 1000°C, and the quenching time is 20 minutes. The tempering temperature is 400°C and the tempering time is 2 hours.

[0017] performance:

[0018] Grain size after sintering: 0.48μm;

[0019] Hardness: 90.5~91.5HRA;

[0020] Density: 14.50~14.62g / cm 3 ;

[0021] Bending strength: 3176N / mm 2 ;

[00...

Embodiment 2

[0024] Composition ratio (wt%):

[0025] 2μmTi 3 SiC 2 Powder: 3%, 2μm tungsten carbide chromium carbide composite powder: 82%, 2μm cobalt powder: 15%;

[0026] Wet grinding under argon protective atmosphere for 24 hours, the amount of alcohol added is 0.3L / kg; dried in a Z-shaped dryer at 90°C, pressed into a round cake with a diameter of 80mm and a thickness of 20mm, with a pressing force of 100 tons, in argon Carry out 5MPa low-pressure sintering under a protective atmosphere, the sintering temperature is 1450°C, the sintering time is 2 hours, the hydrogen flow rate is 30-50SLM, and the argon flow rate is 40SLM; quenching is carried out in a vacuum environment, the quenching temperature is 1240°C, and the quenching time is 20 minutes. The tempering temperature is 500°C, and the tempering time is 4 hours.

[0027] performance:

[0028] Grain size after sintering: 1.77μm;

[0029] Hardness: 86.0~88.5HRA;

[0030] Density: 12.44~12.52g / cm 3 ;

[0031] Bending strength:...

Embodiment 3

[0034] Composition ratio (wt%):

[0035] 0.6μmTi 3 SiC 2 Powder: 5%, 0.8μm tungsten carbide powder: 82%, 1μm cobalt powder: 13%, 1μm tantalum and niobium carbide solid solution 1%;

[0036] Wet grinding for 60 hours under the protective atmosphere of argon, the amount of alcohol added is 0.35L / kg; dried in a Z-shaped dryer at 80°C, pressed into a round cake with a diameter of 80mm and a thickness of 20mm, with a pressing force of 100 tons, in argon Carry out 5MPa low-pressure sintering under a protective atmosphere, the sintering temperature is 1410°C, the sintering time is 1 hour, the hydrogen flow rate is 30-50SLM, and the argon flow rate is 40SLM; quenching is carried out in the air environment, the quenching temperature is 900°C, and the quenching time is 25 minutes. The tempering temperature is 450°C and the tempering time is 3 hours.

[0037] performance:

[0038] Grain size after sintering: 0.75μm;

[0039] Hardness: 88.0~90.5HRA;

[0040] Density: 12.30~12.38g / cm...

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PUM

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Abstract

The invention relates to the powder metallurgy technology, and discloses a high-temperature-oxidation-resistant high-strength Ti3SiC2 hard alloy. The hard alloy is composed of tungsten carbide powder or tungsten carbide composite powder, cobalt powder and Ti3SiC2 powder, wherein the mass ratio of the Ti3SiC2 powder to the hard alloy is 0.1% to 5%; the purity of the Ti3SiC2 powder is larger than 98%, and the particle size is 0.01 micrometer to 10 micrometers. The Ti3SiC2 in the hard alloy can refine hard alloy grains, can hinder grain growth and can strengthen hard alloy compactness; and the actual density of either high-cobalt-alloy or low-cobalt-alloy can reach 99.9% of the theoretical density.

Description

technical field [0001] The invention relates to powder metallurgy technology, and is a kind of high-temperature oxidation-resistant high-strength Ti 3 SiC 2 Carbide. Background technique [0002] Titanium silicon carbide (Ti 3 SiC 2 ) is a new type of ternary layered ceramic material, which combines the properties of metal and ceramics. It not only has the excellent properties of ceramics, but also has high yield strength, high melting point, high thermal stability and high temperature strength, as well as good oxidation resistance, thermal shock resistance and corrosion resistance. At the same time, it has the properties of metal. It has high thermal conductivity and electrical conductivity at room temperature. It can be machined with high-speed steel tools like metal. It has good plasticity at high temperature, lower friction coefficient and better than graphite. self-lubricating properties. It can be applied to sliding parts in the mechanical industry and sliding el...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C29/02C22C1/05C22C1/10
CPCC22C29/02C22C1/051C22C29/005
Inventor 张聚国
Owner JIANGXI UNIV OF SCI & TECH
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