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Submicron grain Ti(C, N)-base cermet and its prepn process

A submicron, metal-based technology, applied in the field of cermet materials, can solve the problems of poor strength and toughness, limit the application range of cermets, etc., achieve the effect of improving hardness and toughness, and reducing tissue stress

Active Publication Date: 2005-04-27
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The early cermet composition is TiC-Mo-Ni, its wear resistance is better than WC-Co cemented carbide, but its strength and toughness are far inferior to WC-Co cemented carbide, which limits the application range of cermets

Method used

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  • Submicron grain Ti(C, N)-base cermet and its prepn process
  • Submicron grain Ti(C, N)-base cermet and its prepn process
  • Submicron grain Ti(C, N)-base cermet and its prepn process

Examples

Experimental program
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example 1

[0039] Select TiC, TiN, WC, Mo, and Ni in Table 2 as raw materials and add an appropriate amount of carbon powder, so that the atomic percentages of the components of the prepared Ti(C, N)-based cermet are approximately: Ti 38, Mo 4.5, W 1.3 , Ni 13, N 6.5, and the rest are C. The samples were prepared by stirring ball milling, sintering-hot isostatic pressing process or vacuum sintering. Stirring ball milling must make the linear velocity of the ball milling medium move above 0.5m / s; the ball-to-material ratio is 5:1; the ball milling time is 2, 6, 12, and 24 hours respectively. During the ball milling process of the mixed powder, an appropriate amount of forming agent is added, dried, molded, and then sintered. The sintering is carried out in a sintering-hot isostatic pressing integrated furnace, the sintering temperature is 1420°C, argon is used as the pressure transmission medium, and the atmospheric pressure is 1.7MPa. Vacuum sintering and ball milling were also carried...

example 2

[0043] The raw materials in Table 2 are selected for batching, so that the atomic percentages of the components of various Ti(C, N)-based cermets prepared are shown in Table 4. The samples were prepared by stirring ball milling, sintering-hot isostatic pressing process. Stirring ball milling must make the linear velocity of the ball milling medium move above 0.5m / s; the ratio of ball to material is 5:1; the time of stirring ball milling is 12 hours respectively. During the ball milling process of the mixed powder, an appropriate amount of forming agent is added, dried, molded, and then sintered. The sintering is carried out in a sintering-hot isostatic pressing integrated furnace, the sintering temperature is 1420°C, argon is used as the pressure transmission medium, and the atmospheric pressure is 1.7MPa. The performance and grain size of hard phase of each alloy are shown in Table 5.

[0044] match

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example 3

[0060] Select TiC, TiN, WC, Mo, and Ni in Table 2 as raw materials and add an appropriate amount of carbon powder, so that the atomic percentages of the components of the prepared Ti(C, N)-based cermet are approximately: Ti 38, Mo 4.5, W 1.3 , Ni 13, N 6.5, and the rest are C. The samples were prepared by planetary ball milling, sintering-hot isostatic pressing process. The revolution speed of the turntable of the planetary ball mill was set at 450rpm. The ball milling time is 12; 24h respectively. After the mixed powder is ball milled, an appropriate amount of molding agent is added, dried, molded, and then sintered. The sintering is carried out in a sintering-hot isostatic pressing integrated furnace, the sintering temperature is 1420°C, argon is used as the pressure transmission medium, and the atmospheric pressure is 1.7MPa. Table 6 shows the performance of the alloy and the grain size of the hard phase after ball milling for 12 and 24 hours.

[0061] Table 6 Propertie...

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Abstract

The present invention relates to the preparation of cermet material, and the sintered alloy has submicron crystal grain structure, and high hardness, toughness and strength. The cermet is prepared through mixing IVB, VB, VIB, Ti, one or more metal carbide, nitride or complex solid solution carbide-nitride ceramic powder and iron family element Ni, Co, etc.; high-energy ball milling, drying, pressing to form, vacuum sintering, hot isostatic pressing and other steps. The cermet has hard crystal phase reaches submicron granularity of 0.6-1.0 micron. Under scanning electronic microscope, four kinds of metal structure may be observed including black core phase, white core phase, gray ring phase and white adhesion phase. Compared with available cermet, the present invention has obviously improved hardness and toughness, and may be used in cutter and other wear resistant parts.

Description

technical field [0001] The invention relates to a cermet material, especially a Ti(C, N)-based cermet with submicron grains and a preparation method thereof. Background technique [0002] Cermet has the characteristics of low density, higher hardness and red hardness than cemented carbide, good chemical stability and oxidation resistance, small friction coefficient against steel, and higher thermal expansion coefficient than WC-Co cemented carbide, etc., and is suitable for use as Cutting tools, measuring tools, molds, wear-resistant parts, etc. The early cermet composition is TiC-Mo-Ni, its wear resistance is better than WC-Co cemented carbide, but its strength and toughness are far inferior to WC-Co cemented carbide, which limits the application range of cermets. Rudy found that adding an appropriate amount of TiN to the cermet can effectively improve the toughness of the cermet, which can be applied to high-speed cutting of steel. As described in US Patent No. 3971656, i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/515C04B35/56C04B35/58C22C29/02C22C29/16
Inventor 熊惟皓崔崑余立新郑勇丰平夏阳华李晨辉陆庆忠
Owner HUAZHONG UNIV OF SCI & TECH
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