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High-obdurability Ti (C, N) base metal ceramic and preparation method thereof

A high-strength toughness, metal-based technology, applied in the field of high-strength toughness Ti-based cermets and their preparation, can solve the problems of cermets such as reduced bending strength and hardness, reduced material wear resistance, and reduced service life, so as to achieve improved durability , high cost performance, and the effect of improving the service life

Active Publication Date: 2014-06-11
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  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

From the strength-toughness theory and R&D practice of cermets, the way to improve its fracture toughness is mainly to increase the content of metal binder phase in the material and develop coarse-grained cermets, but both methods make the bending resistance of cermets The strength and hardness are significantly reduced, reducing the wear resistance of the material, thereby reducing its service life

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Process 1: When preparing the mixture, 0.5 parts of carbon are introduced by carbon nanotubes; Ti is introduced by Ti(C,N) solid solution, which consists of 70wt% Ti(C,N) with a particle size of 9.24μm and 30wt% , Ti(C,N) composition with a particle size of 0.22 μm fine grains;

[0027] Use plasma to modify the surface of carbon nanotubes in a glow discharge plasma furnace. During the glow discharge plasma treatment process, the purity of argon gas used is ≥99.0%, and the pressure of argon gas in the furnace cavity is 40Pa. The voltage is 600V, the working current is 0.4A, and the processing time is 60min;

[0028] The mixing process is carried out in a planetary ball mill, the speed of the ball mill is 180rpm, and the time is 24h;

[0029] The addition of molding agent polyvinyl alcohol is 3wt%, and the pressure used for compression molding is 250MPa;

[0030] The degreasing process is carried out under the condition that the vacuum degree is higher than 10Pa, and th...

Embodiment 2

[0036] Process 2: When preparing the mixture, 0.75 parts of carbon are introduced by carbon nanotubes; Ti is introduced by Ti(C,N) solid solution, which is composed of 80wt% Ti(C,N) with a particle size of 7.68μm and 20wt% , Ti(C,N) composition with a particle size of 0.43 μm fine grains;

[0037] Use plasma to modify the surface of carbon nanotubes in a glow discharge plasma furnace. During the glow discharge plasma treatment process, the purity of argon gas used is ≥99.0%, and the pressure of argon gas in the furnace cavity is 80Pa. The voltage is 700V, the working current is 0.5A, and the processing time is 50min;

[0038] The mixing process is carried out in a planetary ball mill, the speed of the ball mill is 180rpm, and the time is 24h;

[0039] The addition of molding agent polyvinyl alcohol is 3wt%, and the pressure used for compression molding is 250MPa;

[0040] The degreasing process is carried out under the condition that the vacuum degree is higher than 10Pa, an...

Embodiment 3

[0046] Process 3: When preparing the mixture, 1.0 parts of carbon is introduced by carbon nanotubes; Ti is introduced by Ti(C,N) solid solution, which consists of 90wt% Ti(C,N) with a particle size of 5.93μm and 10wt% , Ti(C,N) composition with a particle size of 0.55 μm fine grains;

[0047] Use plasma to modify the surface of carbon nanotubes in a glow discharge plasma furnace. During the glow discharge plasma treatment process, the purity of argon gas used is ≥99.0%, and the pressure of argon gas in the furnace cavity is 100Pa. The voltage is 800V, the working current is 0.6A, and the processing time is 40min;

[0048] The mixing process is carried out in a planetary ball mill, the speed of the ball mill is 180rpm, and the time is 24h;

[0049] The addition of molding agent polyvinyl alcohol is 3wt%, and the pressure used for compression molding is 250MPa;

[0050] The degreasing process is carried out under the condition that the vacuum degree is higher than 10Pa, and t...

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Abstract

The invention provides a high-obdurability Ti (C, N) base metal ceramic and a preparation method of the high-obdurability Ti (C, N) base metal ceramic. The high-obdurability Ti (C, N) base metal ceramic comprises the following components based on parts by weight: 7.0-8.7 of C, 3.0-3.9 of N, 35-44 of Ti, 22-32 of Ni, 12-18 of Mo, 5-8 of W, 0.5-2.0 of Cr and 1.0-2.5 of Nb, wherein 0.5-1.0 part of C is induced from a carbon nano-tube; and Ti is introduced from Ti (C, N) solid solution, and the solid solution consists of 70-90wt% of coarse grain (the grain size is 4-10mu m) and 10-30wt% of fine grain, wherein the size of the fine grain ceramic phase is 1 / 40-1 / 10 of the size of the coarse grain ceramic phase. The preparation method is characterized by comprising the following steps: firstly, carrying out surface modification treatment on the carbon nano-tube by plasma, carrying out ultrasonic dispersion, and adding into the mixture; and preparing the mixture which meets the components requirement, sequentially mixing materials, forming, degreasing to obtain a metal ceramic sintering body through a specific combined vacuum sintering method. According to the method, the metal ceramic is higher in rigidity, bending strength and breaking tenacity.

Description

technical field [0001] The invention belongs to metal-based composite materials and a preparation method thereof, and relates to a high-strength and toughness Ti(C,N)-based cermet and a preparation method thereof. Background technique [0002] Ti(C,N)-based cermets not only have high hardness, wear resistance, and red hardness, but also have excellent chemical stability, and the friction coefficient between metals is also very low. If it is used to prepare cutting tools, compared with the commonly used cemented carbide, it has obvious advantages in the following aspects: it can allow higher cutting speed and larger feed rate, and the workpiece has a better surface performance, the wear resistance of the tool is higher. In Japan, its share in the tool market is increasing year by year. During the Eighth Five-Year Plan period in my country, relevant departments have also invested a lot of effort and have developed some brands of Ti(C,N)-based metal ceramic knives, but their ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C27/04C22C1/05
Inventor 郑勇周伟赵毅杰吕学鹏
Owner SHAREATE TOOLS
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