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Functional gradient nanometer composite Ti(C, N)-base cermet and its preparation method

A nano-composite and functional gradient technology, applied in the field of functional gradient nano-composite Ti-based cermet and its preparation, can solve problems such as difficulties, and achieve the effects of reduced manufacturing cost, low friction coefficient and high hardness

Active Publication Date: 2008-02-27
南京鑫锐新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In addition, although some progress has been made in the development of fine-grained cermets, a large number of experiments have confirmed that it is powerless to prepare cermets with a grain size smaller than 0.2 μm by the current method suitable for industrial production. It is very difficult to substantially improve the performance of this material by means of ultra-fine-grained cermets

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] When preparing the mixture, 10% of the TiC and TiN powders are nano-powders, and all other powders are micro-powders;

[0026] The ball mill rotating speed is 450rpm in the material mixing operation, and the time is 36h;

[0027] The addition of forming agent polyvinyl alcohol is 3wt%, and the pressure used for compression molding is 400MPa;

[0028] The degreasing process is carried out under the condition that the vacuum degree is higher than 10Pa, the holding temperature is 400°C, and the holding time is 10h; the vacuum degree of vacuum sintering is higher than 5.0×10 -2 Pa, the sintering temperature is 1400°C, and the holding time is 100min;

[0029] The purity of nitrogen used in the surface hardening treatment is ≥99.0%, the nitrogen pressure is 0.08MPa, the treatment temperature is 1250°C, and the treatment time is 24h.

[0030] Under the above-mentioned preparation process conditions, the properties of cermets with different composition ratios are shown in Tab...

Embodiment 2

[0034] When preparing the mixture, 15% of the TiC and TiN powders are nano-powders, and all other powders are micro-powders;

[0035] In the mixing process, the ball mill rotating speed is 550rpm, and the time is 24h;

[0036] The addition of forming agent polyvinyl alcohol is 5wt%, and the pressure used for compression molding is 300MPa;

[0037] The degreasing process is carried out under the condition that the vacuum degree is higher than 10Pa, the holding temperature is 500°C, and the holding time is 8h; the vacuum degree of vacuum sintering is higher than 5.0×10 -2 Pa, the sintering temperature is 1430°C, and the holding time is 70min;

[0038] The purity of nitrogen used in the surface hardening treatment is ≥99.0%, the nitrogen pressure is 0.1MPa, the treatment temperature is 1200°C, and the treatment time is 24h.

[0039] Under the above-mentioned preparation process conditions, the properties of cermets with different composition ratios are shown in Table 5.

[004...

Embodiment 3

[0043] When preparing the mixture, 20% of the TiC and TiN powders are nano-powders, and all other powders are micro-powders;

[0044] In the mixing process, the ball mill rotating speed is 600rpm, and the time is 12h;

[0045] The addition amount of molding agent polyvinyl alcohol is 8wt%, and the pressure used for compression molding is 300MPa;

[0046] The degreasing process is carried out under the condition that the vacuum degree is higher than 10Pa, the holding temperature is 600°C, and the holding time is 8h; the vacuum degree of vacuum sintering is higher than 5.0×10 -2 Pa, the sintering temperature is 1450°C, and the holding time is 50min;

[0047] The purity of nitrogen used in the surface hardening treatment is ≥99.0%, the nitrogen pressure is 3.0MPa, the treatment temperature is 1150°C, and the treatment time is 6h.

[0048] Under the above-mentioned preparation process conditions, the properties of cermets with different composition ratios are shown in Table 6. ...

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PUM

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Abstract

The present invention belongs to the field of metal base composite material and its preparation process. The functional gradient nanometer composite Ti(C, N)-base cermet consists of Ti 34-45 wt%, C 8.0-9.5 wt%, Ni 20-30 wt%, Mo 12-22 wt%, N 2.5-3.5 wt%, W 5-8 wt%, Cr 0.6-2.0 wt% and V 0.2-1.0 wt%. The preparation process includes mixing the materials in the said proportion, adding forming agent, pressing to form, degreasing, vacuum sintering to obtain sintered body and final nitrification in 0.08-6 MPa nitrogen atmosphere and at 1100-1250 deg.c. The material has high bending strength and high surface hardness, and may be used in cutting tool, drawing die, pressing mold, etc.

Description

1. Technical field [0001] The invention belongs to a ceramic material and a preparation method thereof, and relates to a functional gradient nanocomposite Ti(C, N)-based cermet and a preparation method thereof. 2. Background technology [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 them and metals is also very low. If it is used as a tool, 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 better surface properties. , the tool wear resistance is higher. In Japan, its share in the tool market is increasing year by year. The main grades in the Japanese market are shown in Table 1. During the Eighth Five-Year Plan period in my country, relevant departments have also invested a lot of effort and have developed some brands ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/515C04B35/56C04B35/58C04B35/622
Inventor 郑勇刘文俊石增敏
Owner 南京鑫锐新材料科技有限公司
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