Gradient structure carbon nano-tube enhanced Ti(C, N)-based metal ceramic and preparation method thereof

A carbon nanotube and gradient structure technology, which is applied in metal material coating process, coating, solid-state diffusion coating, etc., can solve the problems of thin surface functional gradient layer, easy peeling of surface hardened layer, and high cost of coating preparation. To achieve the effect of increasing the amount of feed, superior comprehensive mechanical properties, and excellent toughness

Inactive Publication Date: 2009-10-28
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the preparation cost of the coating is relatively high, and there is an obvious interface between the coating and the substrate. When high-speed cutting is performed, the surface hardened layer is easy to peel off, and it is easy to chip
And because the thermal expansion coefficients of different materials are different, the coated tool material is prone to cracks due to the influence of thermal stress during the cooling process, causing the coating to fall off and the tool to fail
[0010] In view of the above situation, some people have also invented a method for preparing functionally graded cermets by surface nitriding treatment in a high-temperature nitrogen environment, but this method has a long process, low preparation efficiency, and a thin surface functionally graded layer.

Method used

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  • Gradient structure carbon nano-tube enhanced Ti(C, N)-based metal ceramic and preparation method thereof
  • Gradient structure carbon nano-tube enhanced Ti(C, N)-based metal ceramic and preparation method thereof
  • Gradient structure carbon nano-tube enhanced Ti(C, N)-based metal ceramic and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] When preparing the mixture, 0.5 part of the carbon is introduced by carbon nanotubes;

[0032] The mixing process is carried out in a planetary ball mill, the speed of the ball mill is 160rpm, and the time is 24h;

[0033] The addition amount of molding agent polyvinyl alcohol is 3mass%, and the pressure used for compression molding is 250MPa;

[0034] The degreasing process is carried out under the condition that the vacuum degree is higher than 10Pa, and the heating rate between 200-400°C is 0.3°C / min;

[0035] The vacuum degree of vacuum sintering is higher than 5.0×10 -2 Pa, the sintering temperature is 1410°C, and the holding time is 60min.

[0036] The purity of argon gas used in double-layer glow plasma carburizing treatment is ≥99.0%, the pressure of argon gas filled in the furnace cavity is 20Pa, the treatment temperature is 1100°C, and the treatment time is 180min.

[0037] Under the above-mentioned preparation process conditions, the properties of cermets ...

Embodiment 2

[0041] When preparing the mixture, 0.75 parts of carbon are introduced by carbon nanotubes;

[0042] The mixing process is carried out in a planetary ball mill, the speed of the ball mill is 180rpm, and the time is 16h;

[0043]The addition amount of molding agent polyvinyl alcohol is 5mass%, and the pressure used for compression molding is 300MPa;

[0044] The degreasing process is carried out under the condition that the vacuum degree is higher than 10Pa, and the heating rate between 200-400°C is 0.4°C / min;

[0045] 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 80min.

[0046] The purity of argon gas used in double-layer glow plasma carburizing treatment is ≥99.0%, the pressure of argon gas filled in the furnace cavity is 30Pa, the treatment temperature is 1100°C, and the treatment time is 90min.

[0047] Under the above-mentioned preparation process conditions, the properties of cermets wit...

Embodiment 3

[0051] When preparing the mixture, 1.0 part of the carbon is introduced by carbon nanotubes;

[0052] In the mixing process, the ball mill rotating speed is 220rpm, and the time is 12h;

[0053] The addition amount of molding agent polyvinyl alcohol is 5mass%, and the pressure used for compression molding is 320MPa;

[0054] The degreasing process is carried out under the condition that the vacuum degree is higher than 10Pa, and the heating rate between 200-400°C is 0.4°C / min;

[0055] 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 60min;

[0056] The purity of argon gas used in double-layer glow plasma carburizing treatment is ≥99.0%, the pressure of argon gas filled in the furnace cavity is 40Pa, the treatment temperature is 1200°C, and the treatment time is 90min.

[0057] Under the above-mentioned preparation process conditions, the properties of cermets with different composition ratios ar...

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Abstract

The invention relates to a gradient structure carbon nano-tube enhanced Ti(C, N)-based metal ceramic and a preparation method thereof, which belong to a metallic matrix composite material and a preparation method thereof. The metal ceramic comprises the following components in portion by mass: 6.5 to 8.0 portions of C, 1.5 to 2.5 portions of N, 36 to 45 portions of Ti, 20 to 32 portions of Ni, 10 to 18 portions of Mo, and 6 to 10 portions of W, wherein 0.5 to 1.0 portion of the carbon is introduced by a carbon nano-tube. The preparation method of the metal ceramic comprises the following steps: preparing raw materials into a mixed material according with the components; performing material mixing, forming agent adding, press forming, degreasing and vacuum sintering to obtain a sintered body; and putting the sintered body into a double-layer glow plasma carburizing furnace to perform carbonization. A source electrode material is high purity graphite of which the purity is more than 96 percent, the purity of used argon gas is more than or equal to 99.0 percent, the pressure of the argon gas filled into the furnace is between 20 and 40 Pa, the processing temperature is between 1,100 and 1,200 DEG C, and the processing time is between 90 and 180 minutes. The material has high bending strength, and the surface has high hardness: sigmab is more than or equal to 1,850 MPa, and HRA is more than or equal to 93.0. The metal ceramic can be applied to cutting tools, wire-drawing dies, pressing dies and the like.

Description

technical field [0001] The invention belongs to a ceramic material and a preparation method thereof, and relates to a Ti(C, N)-based cermet reinforced by carbon nanotubes with a gradient structure and a preparation method thereof. Background technique [0002] Ti(C,N)-based cermets have high hardness, wear resistance, red hardness, excellent chemical stability, and excellent creep resistance, and have a low coefficient of friction with metals. Compared with the most widely used cemented carbide and coated cemented carbide in the current processing industry, it has obvious advantages in the following aspects: it can allow higher cutting speeds, The amount of feed, the workpiece has better surface properties and higher wear resistance. In addition, this material does not contain strategic substances such as Co, nor does it contain expensive compounds such as WC. The raw materials used are commonly used and easily available elements, and its manufacturing cost is much cheaper ...

Claims

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Application Information

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IPC IPC(8): C22C29/02C22C1/05C23C8/36
Inventor 郑勇钟杰张一欣余海州袁泉吴鹏
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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