Azotized metal ceramic and its preparing process

A technology for nitriding metal and ceramics, which is applied in the field of high temperature and high pressure nitriding Ti-based cermet and its preparation, can solve the problems of low yield and prone to cracks, and achieves high yield, eliminate cracks and high wear resistance. Effect

Inactive Publication Date: 2005-04-06
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, its biggest disadvantage is that it is prone to cracks during the preparation process and the yield is low.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] The rotating speed used in the mechanical alloying process is 280rpm, and the time is 98h;

[0034] The addition of molding agent polyvinyl alcohol is 4wt%, and the pressure used for compression molding is 200Mpa;

[0035] The degreasing process is carried out under the condition that the degree of vacuum is higher than 5Pa, the holding temperature is 600° C., and the holding time is 10 hours.

[0036] The vacuum degree of vacuum sintering is higher than 1.0×10 -1 Pa, the sintering temperature is 1410°C, and the holding time is 50min;

[0037] Nitrogen pressure for nitriding treatment is 100MPa, treatment temperature is 1300°C, and holding time is 120min.

[0038] Under the above-mentioned preparation process conditions, the properties of cermets with different composition ratios are shown in Table 2.

[0039] Table 2 Properties of different cermets prepared by process 1

[0040] Composition 1# 2# 3# 4#

[0041] Bending strength σ bb (MPa) 1802 1927 1911 1925

[...

Embodiment 2

[0044] The rotating speed used in the mechanical alloying process is 310rpm, and the time is 120h;

[0045] The addition amount of molding agent polyvinyl alcohol is 6wt%, and the pressure used for compression molding is 220Mpa;

[0046] The degreasing process is carried out under the condition that the degree of vacuum is higher than 5 Pa, the holding temperature is 500° C., and the holding time is 6 hours.

[0047] The vacuum degree of vacuum sintering is higher than 1.0×10 -1 Pa, the sintering temperature is 1415°C, and the holding time is 60min;

[0048] Nitrogen pressure for nitriding treatment is 120MPa, treatment temperature is 1100°C, and holding time is 120min.

[0049] Under the above-mentioned preparation process conditions, the properties of cermets with different composition ratios are shown in Table 3.

[0050] Table 3 Properties of different cermets prepared by process 2

[0051] Composition 1# 2# 3# 4#

[0052] Bending strength σ bb (MPa) 1876 1968 1993 197...

Embodiment 3

[0055] The rotating speed used in the mechanical alloying process is 350rpm, and the time is 122h;

[0056] The addition amount of molding agent polyvinyl alcohol is 8wt%, and the pressure used for compression molding is 280Mpa;

[0057] The degreasing process is carried out under the condition that the degree of vacuum is higher than 5Pa, the holding temperature is 450° C., and the holding time is 8 hours.

[0058] The vacuum degree of vacuum sintering is higher than 1.0×10 -1 Pa, the sintering temperature is 1420°C, and the holding time is 70min;

[0059] The nitrogen pressure for nitriding treatment is 130MPa, the treatment temperature is 1200°C, and the holding time is 120min.

[0060] Under the above-mentioned preparation process conditions, the properties of cermets with different composition ratios are shown in Table 4.

[0061] Table 4 Properties of different cermets prepared by process 3

[0062] Composition 1# 2# 3# 4#

[0063] Bending strength σ bb (MPa) 1797 ...

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PUM

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Abstract

The invention relates to a method to produce nitridation metal ceramics that belongs to ceramics material producing field. It adopts optimizing material ingredients, improving nitridation process technology, forming grads structure to improve hardness of the surface and inner tenacity. The ingredients of the metal ceramics is 29<=Tic<=45, 8<=Tin<=12, 28<=Ni<=32, 11<=Mo<=15, 7<=WC<=10, 0.5<=C<=1, 0.5<=NbC<=1. The process to produce is as following steps: first, mixing Tic powder and TiN powder to produce compound including millimicron grade of Ti(C, N) solid solution compound by mechanism alloying. Making the compound mixed with WC, NbC, Mo, Ni, C powder according to the previous ingredients, adding molding dosage for molding; degreasing, sintering and nitridation processing under high temperature and high pressure. The material has high hardness, high bending strength, HV>=2000 and DELTAbb>=1800Mpa. It can be used for cutting tools, drawing die and compression die.

Description

technical field [0001] The invention belongs to a ceramic material and a preparation method thereof, in particular to a high-temperature and high-pressure nitride Ti(C, N)-based cermet and a preparation method thereof. Background technique [0002] With the application of CNC machine tools, machining centers and flexible manufacturing systems in the machinery manufacturing industry, the auxiliary man-hours of machining have been greatly shortened, and cutting has become the main contradiction for the machinery manufacturing industry to improve processing efficiency. In order to further reduce the cost and reduce the pollution of cutting fluid to the environment, high-speed dry cutting has become the focus of current research in the machinery manufacturing industry, which is called an ideal green manufacturing process. Tool material is an indispensable related technology for high-speed cutting and dry cutting, and has a large market demand. Therefore, it is of great significa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/58C04B35/622
Inventor 熊惟皓崔崑郑立允郑勇刘文俊余立新晏鲜梅范畴肖建华
Owner HUAZHONG UNIV OF SCI & TECH
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