Preparation method of self-lubricating surface type Ti(C, N)-based cermet wear-proof material

A cermet and wear-resistant material technology, applied in the field of wear-resistant materials, can solve the problems of low efficiency, long carburizing time, grain growth, etc., and achieve the effect of simple process, improved carburizing efficiency, and small particle size.

Active Publication Date: 2017-09-08
SICHUAN UNIV
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Problems solved by technology

[0005] Aiming at the problems of severe grain growth, long carburizing time and low efficiency in the "sintering + carburizing" process of preparing surface self-lubricating cermet wear-resistant materials, the present invention proposes to first remove the cermet compact into shape agent to form a porous green body, and then Al 2 o 3 coated TiH 2 The core / shell structure powder and graphene mixed planetary ball mill are uniformly mixed to form a hydrogen-containing carburizing medium, then the porous green body is placed in the carburizing medium and compacted, and finally the surface self-lubricating Ti( Preparation of C,N)-based Cermet Wear-resistant Materials

Method used

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  • Preparation method of self-lubricating surface type Ti(C, N)-based cermet wear-proof material

Examples

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example 1

[0018] Example 1: Prepare the surface self-lubricating Ti(C,N)-based cermet wear-resistant material according to the following steps:

[0019] (1) Preparation of the release agent cermet green body: Weigh various raw material powder ingredients by weight percentage, of which Ni accounts for 6wt%, Co accounts for 8wt%, Mo 2 C accounts for 5wt%, WC accounts for 7wt%, TiC 0.7 N 0.3 as the balance; mix the weighed powders and pass through 36h ball milling, 400-mesh sieve filtration, drying at 88°C, adding 70% of the weight of cermet powder into a butadiene rubber molding agent, and pressing at 320MPa to obtain a cermet green body ;The cermet green body is kept in a vacuum sintering furnace at 580°C for 2 hours, the heating rate is 3°C / min, and the vacuum degree is 15Pa, forming a cermet green body with a porosity of 25% and removing the forming agent;

[0020] (2) Preparation of hydrogen-containing carburizing medium: first weigh TiH with a particle size of 0.7 μm 2 The powder ...

example 2

[0023] Example 2: Prepare the surface self-lubricating Ti(C,N)-based cermet wear-resistant material according to the following steps:

[0024] (1) Preparation of the release agent cermet green body: Weigh various raw material powder ingredients by weight percentage, of which Ni accounts for 8wt%, Co accounts for 4wt%, Mo 2 C accounts for 15wt%, WC accounts for 20wt%, TiC 0.7 N 0.3 as the balance; mix the weighed powders and pass through 68h ball milling, filter with 400 mesh screen, dry at 92°C, mix 110% of the weight of the cermet powder with Buna-Na rubber molding agent, and press at 380MPa to obtain a cermet green body ; The cermet green body is kept in a vacuum sintering furnace at 620°C for 4h, the heating rate is 4°C / min, and the vacuum degree is 25Pa, forming a cermet green body with a porosity of 35% and a molding agent removed;

[0025] (2) Preparation of hydrogen-containing carburizing medium: first weigh TiH with a particle size of 1.3 μm 2 The powder is added to...

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Abstract

The invention discloses a preparation method of a self-lubricating surface type Ti(C, N)-based cermet wear-proof material. The preparation method of the self-lubricating surface type Ti(C, N)-based cermet wear-proof material is characterized in that the temperature is kept at 500-650 DEG C for 2-4 h, so that a forming-agent-free cermet green body with the porosity being 25%-40% is formed; core/shell structure powder with Al2O3 covering TiH2 and graphene are mixed at the weight percentage ratio of 2:1 to be prepared into a hydrogenous carburizing medium, wherein the thickness of the graphene is smaller than 3 nm, the number of layers of the graphene is smaller than 3, and the specific surface area of the graphene is larger than 250 m<2>/g; the green body is embedded into the hydrogenous carburizing medium and is compacted at the pressure of 5-15 MPa; and finally, liquid-phase sintering is conducted, and preparation of the self-lubricating surface type Ti(C, N)-based cermet wear-proof material is achieved. The preparation method of the self-lubricating surface type Ti(C, N)-based cermet wear-proof material solves the problems that in the prior art, grains grow severely, the carburizing time is long, and efficiency is low, and the self-lubricating surface type Ti(C, N)-based cermet wear-proof material is prepared in the sintering process.

Description

technical field [0001] The invention relates to a preparation method of a cermet wear-resistant material, in particular to a preparation method of a surface self-lubricating Ti(C,N)-based cermet wear-resistant material, which belongs to the field of wear-resistant materials. Background technique [0002] Ti(C,N)-based cermets have low friction coefficient, high hardness and high wear resistance, and can be made into wear-resistant parts such as sealing rings and shaft sleeves. In order to improve its wear resistance, it is necessary to introduce a solid lubricant on its surface to form a surface self-lubricating layer. [0003] CN104496548A discloses a cermet surface treatment method, which adopts the following method: the cermet green body is placed in a vacuum container filled with carbon source gas mixed with methanesulfonate gas and carbon fiber cotton, and the cermet body is placed under the condition greater than or equal to the sintering temperature of the ceramic (1...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C29/04C22C1/05C22C1/10C23C8/64
CPCC22C1/055C22C29/005C22C29/04C23C8/64
Inventor 郭智兴熊计周黎明
Owner SICHUAN UNIV
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