High-hardness and high-toughness metal ceramic and preparation method and application thereof

A cermet, high toughness technology, applied in the field of ceramic materials, can solve the problems of high sintering cost and long sintering time, and achieve the effects of improving mechanical properties, inhibiting grain growth, improving red hardness and thermal shock resistance

Active Publication Date: 2019-11-19
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Commercially, pressureless sintering is commonly used to prepare cermets, but the sintering time is long and the sintering cost is high

Method used

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  • High-hardness and high-toughness metal ceramic and preparation method and application thereof
  • High-hardness and high-toughness metal ceramic and preparation method and application thereof
  • High-hardness and high-toughness metal ceramic and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] 1. According to 55wt% TiC 0.7 N 0.3 , 17wt% WC, 7wt% Ni, 7wt% Co, 8wt% Mo 2 C, 6wt% NbC is used for powder mixing, WC-C cemented carbide balls (YG8) with a diameter of 10mm, and an appropriate amount of absolute ethanol are added, and the mixed powder is ball milled on the ball mill for 24 hours by using a planetary ball mill, and the mixed powder ;

[0029] 2. Put the mixed powder in an electric drying oven with a temperature of 100°C for 16 hours to make the powder fully dry.

[0030] 3. Add polyvinyl alcohol as a molding agent to the dried mixed powder for granulation, and improve the fluidity, formability and reduce friction of the powder during the pressing process through granulation.

[0031] 4. Put the pressed blank into an SPS mold, sinter at a temperature of 1800° C. and hold it for 3 minutes to obtain a cermet.

[0032] Performance test: The bending strength of the obtained cermet is 2285MPa, the Vickers hardness is 1880HV, and the density is 6.77g / cm 3 ...

Embodiment 2

[0034] 1. According to 60wt% TiC 0.7 N 0.3 , 15wt% WC, 7wt% Ni, 7wt% Co, 7wt% Mo 2 C, 4wt% NbC is used for powder mixing, WC-C cemented carbide balls (YG8) with a diameter of 10mm, and then add an appropriate amount of absolute ethanol, and use a planetary ball mill to mill the mixed powder on the ball mill.

[0035] 2. After mixing for 30 hours, place the mixed powder in an electric drying oven at a temperature of 100°C for 12 hours to dry the powder sufficiently to obtain a mixed powder.

[0036] 3. Add polyvinyl alcohol powder molding agent to the dried mixed powder for granulation. Through granulation to improve the fluidity, formability and reduce the friction of the powder during the pressing process.

[0037] 4. Put the pressed blank into an SPS mold, sinter at a temperature of 1750° C. and keep it warm for 4 minutes to make a cermet.

[0038] Performance test: The bending strength of the obtained cermet is 2218MPa, the Vickers hardness is 1850HV, and the density is...

Embodiment 3

[0040] 1. According to 60wt% TiC 0.7 N 0.3 , 15wt% WC, 7wt% Ni, 7wt% Co, 7wt% Mo 2 C, 4wt% NbC is used for powder mixing. WC-C cemented carbide balls (YG8) with a diameter of 10mm are added with an appropriate amount of absolute ethanol, and the mixed powder is ball milled and mixed on the ball mill for 30 hours using a planetary ball mill.

[0041] 2. Put the mixed powder in an electric drying oven at a temperature of 100° C. for 12 hours to dry the powder sufficiently to obtain the mixed powder.

[0042] 3. Add polyvinyl alcohol powder molding agent to the dried mixed powder for granulation, and improve the fluidity, formability and reduce the friction of the powder during the pressing process through granulation.

[0043] 4. Put the pressed blank into the SPS mold, sinter at a temperature of 1700°C and keep it warm for 5 minutes to make a cermet.

[0044]Performance test: The bending strength of the obtained cermet is 2182MPa, the Vickers hardness is 1900HV, and the dens...

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Abstract

The invention belongs to the technical field of cutting tools, and discloses high-hardness and high-toughness metal ceramic and a preparation method and application thereof. According to the metal ceramic, TiC<0.7>N<0.3>, WC, Ni, Co, Mo<2>C and NbC are mixed, and then WC cemented carbide balls and anhydrous ethanol are added for ball milling; and mixed slurry is dried at 80-100 DEG C, a forming agent polyvinyl alcohol is added for granulation, granulated powder is pre-pressed for forming, plasma sintering is adopted, 25-30 Mpa of pressure is applied, and the temperature is raised to 1,700-1,800 DEG C for sintering to obtain the metal ceramic. Ti(C, N) is a hard phase of the metal ceramic, the density of the metal ceramic is improved and the thickness of a ring phase is controlled, the structure and performance of the ring phase are further improved, NbC is a grain inhibitor and can be used for inhibiting the growth of crystal grains in the sintering process, the mechanical properties of the metal ceramic are improved, and the red hardness and thermal shock resistance of the metal ceramic are improved.

Description

technical field [0001] The invention belongs to the technical field of ceramic materials, and more specifically relates to a high-hardness and high-toughness cermet and its preparation method and application. Background technique [0002] With the rapid development of the manufacturing industry, high-speed cutting processing technology has been widely used. High-speed processing technology can greatly improve cutting efficiency, improve the quality of workpiece processing surface, and reduce processing costs. Ti(C,N)-based cermet tools are more The WC-based cemented carbide cutting tools have higher red hardness, good chemical stability and wear resistance. It is widely used in the field of high-speed machining of cast iron, carbon steel and stainless steel. Spark plasma sintering (spark plasmasintering, referred to as SPS) is a new material preparation technology. It is to put metal and other powders into molds made of graphite and other materials, and use the upper and lo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C29/04C22C1/05C22C1/10
CPCC22C1/05C22C29/005C22C29/04
Inventor 郭伟明宋邦超林华泰
Owner GUANGDONG UNIV OF TECH
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