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Ti(c,n)-based cermet with non-magnetic gradient structure and preparation method thereof

A cermet and magnetic gradient technology, applied in the field of Ti-based cermets, can solve the problems of non-magnetism, achieve the effects of improving bonding strength, reducing interfacial internal stress, excellent wear resistance and impact resistance

Active Publication Date: 2016-01-20
HUAZHONG UNIV OF SCI & TECH
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  • Description
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Problems solved by technology

[0005] The invention provides a Ti(C,N)-based cermet with a non-magnetic gradient structure and a preparation method thereof, which solves the contradiction between the strength, toughness and non-magnetism existing in the existing Ti(C,N)-based cermet , so that Ti(C,N)-based cermets have high strength and toughness while being non-magnetic

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Embodiment Construction

[0023] The present invention will be further described below in conjunction with specific examples.

[0024] The first group of embodiments is about the preparation method of Ti(C,N)-based cermet with non-magnetic gradient structure, including the steps of ball milling, molding, vacuum degreasing, vacuum sintering and high-temperature isostatic pressing surface nitriding treatment steps:

[0025] (1) Ball mill mixing step: according to the weight percent of the chemical composition of Ti(C, N) based cermet with non-magnetic gradient structure shown in Table 1, TiC, TiN, Ni, Mo 2 C, WC and Cr 3 C 2 The powder is used as a raw material to be prepared into a mixture, and then ball milling is carried out according to the ball mill mixing process parameters shown in Table 2 to obtain a uniform mixture slurry;

[0026] Table 1 The weight percent of the chemical composition of six non-magnetic gradient Ti(C, N)-based cermets

[0027]

[0028] Table 2 Process parameters for prep...

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Abstract

The invention provides a non-magnetic Ti(C, N) base cermet with a gradient structure and a preparation method thereof, belonging to Ti(C, N) base cermets and solving the problem of contradictions between strong toughness and no magnetism of existing Ti(C, N) base cermets, so that the Ti(C, N) base cermet simultaneously has strong toughness and no magnetism. The non-magnetic Ti(C, N) base cermet with the gradient structure is prepared by using TiC, TiN, Ni, Mo2C, WC and Cr3C2 powder as the raw materials and carrying out ball-milling and mixing, die forming, vacuum degreasing, vacuum sintering and hot isostatic pressing surface nitriding. The non-magnetic Ti(C, N) base cermet has good wear resistance, red hardness, impact resistance and chemical stability, has low coefficients of friction with the materials such as iron and steel, silicon carbide and the like, has bending strength not less than 1800MPa, core matrix hardness of 86.0-92.5HRA and surface hardening layer Vickers microhardness of 1800-2050kg / mm<2>, is especially suitable for manufacturing non-magnetic cutting tools, non-magnetic dies and non-magnetic wear-resistant parts, has widened application range and has good popularization and application prospects in the industries such as tools and dies, national defences, military projects and the like.

Description

technical field [0001] The invention belongs to Ti(C,N)-based cermets, in particular to a Ti(C,N)-based cermet with a non-magnetic gradient structure and a preparation method thereof. Background technique [0002] With the rapid development of industries such as aerospace, national defense and military industry, communications, machinery, and energy equipment, the performance requirements for magnetic components are constantly improving. Using non-magnetic, wear-resistant molds for molding or tool cutting processing, forming resistance, The cutting resistance is small, which can ensure the consistency of the electromagnetic characteristics of the magnetic components and the processing quality and efficiency. Another example is that if wear-resistant parts such as mechanical seal rings on ships and other equipment are non-magnetic, the lightning protection performance of the equipment can be improved, which is conducive to magnetic stealth. [0003] The non-magnetic material...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C29/02C22C1/05
Inventor 熊惟皓杨青青张曼张国鹏陈肖黄斌姚振华
Owner HUAZHONG UNIV OF SCI & TECH
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