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Ultrafine grain metal ceramics and preparation method thereof

A cermet and ultra-fine grain technology, applied in the field of ultra-fine grain cermet and its preparation, can solve the problems of unstable performance and low toughness, and achieve the effect of reduced N volatilization probability, stable performance and excellent performance

Active Publication Date: 2018-03-13
湖南金锐美新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims to solve the problems of low toughness and unstable performance of ultrafine-grained Ti(C,N)-based cermets in the prior art, and provides a high-strength, high-toughness Ti(C,N)-based cermet and its Preparation

Method used

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  • Ultrafine grain metal ceramics and preparation method thereof
  • Ultrafine grain metal ceramics and preparation method thereof
  • Ultrafine grain metal ceramics and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0045] The percentages by weight of the components of the ultra-fine-grain cermet designed in this embodiment are: nano-TiC particles (with a particle diameter of 100 nm): 3%, TiC whiskers 5% (with an aspect ratio of 20:1 and a diameter of 800 nm ), Ti(C,N) powder: 43%, WC powder: 18%, Mo 2 C powder: 8%, TaC powder: 5%, Ni powder: 10%, Co powder: 8%.

[0046] The processing method is as follows: Ti(C,N) powder with a particle size of 1.5 μm is used as raw material; WC powder with a particle size of 0.8 μm; Mo2C powder with a particle size of 2.0 μm; TaC powder with a particle size of 1.0 μm; Ni powder with a particle size of 2.0 μm and Co powder with a particle size of 1.5 μm. The above raw materials were wet-milled, the ball-to-material ratio was 12:1, the rotational speed was 40r / min, the ball milling was 100h, and the nano-TiC particles and TiC whiskers were added when the ball milling was 90h. After the slurry is filtered, dried, alcohol is recovered, and then sieved to ...

Embodiment 2

[0051] The percentages by weight of the components of the ultrafine-grained cermet designed in this embodiment are: nano-TiC particles (with a particle size of 50 nm): 1%, nano-TiC whiskers 4% (with an aspect ratio of 50:1 and a diameter of 500 Nano), Ti(C,N) powder: 47%, WC powder: 15%, Mo 2 C powder: 10%, TaC powder: 5%, Ni powder: 12%, Co powder: 6%.

[0052] The processing method is the same as that of Comparative Example 1, but TiC whiskers are added at the 80th hour of ball milling, and then ball milling is continued until 100 hours. The product is tested for density, flexural strength, Rockwell hardness and metallographic microstructure according to relevant standards. The density of the product is 6.91g / cm3, the hardness is 93HRA, the bending strength is 2310MPa, and the fracture toughness is 14.2MPa / m 2 .

Embodiment 3

[0054] The percentages by weight of the components of the ultrafine-grained cermet designed in this embodiment are: nano-TiC particles (with a particle size of 80nm): 3%, and TiC whiskers with 8% (with an aspect ratio of 20:1 and a diameter of 600 nm). Nano), Ti(C,N) powder: 45%, WC powder: 15%, Mo 2 C powder: 8%, TaC powder: 3%, Ni powder: 10%, Co powder: 8%.

[0055] The processing method is the same as that of Comparative Example 1, but TiC whiskers are added at the 60th hour of ball milling, and then ball milling is continued until the end of 80h. The product is tested for density, flexural strength, Rockwell hardness and metallographic microstructure according to relevant standards. The density of the product is 6.58g / cm3, the hardness is 92.8HRA, the bending strength is 2510MPa, and the fracture toughness is 14.8MPa / m 2 .

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Abstract

The invention discloses ultrafine grain metal ceramics and a preparation method thereof and particularly relates to ultrafine grain Ti(C,N)-based metal ceramics and a preparation method thereof. The ultrafine grain metal ceramics comprises the following components of, by mass, 40%-85% of matrix phase, 5%-25% of reinforced phase, 8%-30% of binding phase, and the balance adding phase. The matrix phase is Ti(C,N). The adding phase is the second kind of carbide and is composed of one or more compounds in carbide, nitride, carbonitride and carbonitride solid solution of the fourth, fifth and sixthtransition metal elements of the periodic table. The reinforced phase comprises nano TiC particles and nano TiC whiskers. The mass ratio of the nano TiC particles and the nano TiC whiskers is 0.1-10:1. According to the ultrafine grain metal ceramics and the preparation method thereof, the component design is reasonable, the preparation process is simple, and the obtained product is excellent in performance, and large-scale industrialized application is convenient.

Description

technical field [0001] The invention discloses an ultrafine-grain cermet and a preparation method thereof, in particular to an ultrafine-grain Ti(C,N)-based cermet and a preparation method thereof. Background technique [0002] Ti(C,N)-based cermets have better high temperature performance, wear resistance and chemical stability than traditional hard alloys, and can save a lot of strategic "tungsten" resources at the same time. Ti(C,N)-based cermets use Ti(C,N) or the mixed powder of TiC and TiN as the hard phase, Ni, Co, Mo, etc. as the binder phase, and usually add WC, Mo 2 C, TaC, NbC, Cr 2 C 3 , VC and other transition metal carbides to improve and enhance the sintering and mechanical properties of the material. [0003] High-speed cutting is the inevitable result of the rapid development of industry, and the high-temperature performance of tool materials is the most important thing affecting the development of high-speed tool technology. However, there is still a ce...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C29/04C22C29/02C22C1/05
Inventor 褚胜林熊慧文
Owner 湖南金锐美新材料有限公司
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