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In situ preparation method of surface self-lubricating ti(c,n) based cermets based on carbon diffusion

A cermet, in-situ preparation technology, applied in the direction of solid-state diffusion coating, metal material coating process, coating, etc., can solve the problems of grain growth, low efficiency, long carburizing time, etc., and achieve small particle size, The process is simple and the effect of improving carburizing efficiency

Active Publication Date: 2019-01-18
SICHUAN UNIV
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Problems solved by technology

[0004] 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 materials, the present invention proposes to remove the forming agent from the cermet compact first. It forms a porous green body, and then Al 2 o 3 coated TiH 2 core / shell structure powder, nano-graphite with a particle size of 30~50nm, BaCO 3 When mixed planetary ball milling, it is uniformly mixed to form a hydrogen-containing carburizing medium, and then the porous green body is placed in the carburizing medium and compacted, and finally the surface is self-lubricating based on carbon diffusion during liquid phase sintering Ti(C,N)-based metal In situ preparation of ceramics

Method used

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  • In situ preparation method of surface self-lubricating ti(c,n) based cermets based on carbon diffusion

Examples

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Effect test

example 1

[0018] Example 1: Surface self-lubricating Ti(C,N)-based cermets were prepared in situ 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 8wt%, Co accounts for 2wt%, Mo 2 C accounts for 5wt%, WC accounts for 6wt%, TiC 0.7 N 0.3 As the balance; mix the weighed powder and pass through 36h ball milling, 400-mesh sieve filtration, drying at 85°C, mixing 65% of the cermet powder weight with Buna-Na rubber molding agent, and pressing at 300MPa to obtain a cermet green body ; The cermet green body is kept in a vacuum sintering furnace at 500°C for 2h, the heating rate is 2°C / min, and the vacuum degree is 10Pa, forming a cermet green body with a porosity of 26% and removing the forming agent;

[0020] (2) Preparation of hydrogen-containing carburizing medium: first weigh TiH with a particle size of 0.9 μm 2 The powder is added to absolute etha...

example 2

[0024] Example 2: Surface self-lubricating Ti(C,N)-based cermets were prepared in situ according to the following steps:

[0025] (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 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 65h ball milling, filter with 400-mesh screen, dry at 90°C, mix 110% of the weight of cermet powder with Buna-Na rubber molding agent, press molding at 350MPa to obtain cermet green body ; The cermet green body is kept in a vacuum sintering furnace at 600°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 32% and a molding agent removed;

[0026] (2) Preparation of hydrogen-containing carburizing medium: first weigh TiH with a particle size of 1.4 μm 2 The powder is added to absolute et...

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Abstract

The invention discloses a method for preparing surface self-lubrication type Ti(C, N)-based cermet in situ based on carbon diffusion. The method for preparing the surface self-lubrication type Ti(C, N)-based cermet in situ based on carbon diffusion is characterized in that firstly, the temperature is kept at 500-650 DEG C for 2-4 hours, so that a forming-agent-free cermet green body with the porosity being 25%-40% is formed; Al2O3 core / shell structure powder covered with TiH2, graphene with the particle sizing being 30-50 nm and BaCO3 are mixed according to the weight percentage ratio of 2:1:1 to be prepared into a hydrogenous carburizing medium; 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 the self-lubrication surface type Ti(C, N)-based cermet is prepared in situ based on carbon diffusion. The method for preparing the self-lubrication surface type Ti(C, N)-based cermet in situ based on carbon diffusion solves the problems that in the prior art, grains grow severely, the carburizing time is long and efficiency is low, and in-site preparation of the surface self-lubrication type Ti(C, N)-based cermet is achieved in the sintering process.

Description

technical field [0001] The invention relates to a preparation method of a cermet material, in particular to an in-situ preparation method of a surface self-lubricating Ti(C,N)-based cermet based on carbon diffusion, and belongs to the field of composite materials. Background technique [0002] Ti(C,N)-based cermets are composed of hard phase, binder phase and additives. It has the advantages of low density, higher hardness and red hardness than cemented carbide, and good chemical stability and oxidation resistance. Cutting tools and wear-resistant parts can have broad application prospects. The introduction of graphite and other self-lubricating phases on the surface of cermets can reduce the degree of wear and improve its friction and wear properties, which is conducive to its wide application. CN106011733A discloses a cermet surface treatment method, which is characterized in that: the ceramic body is placed in a vacuum container filled with carbon source gas, carburizing...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C29/04C22C1/05C22C1/10C23C8/64
CPCC22C1/055C22C29/005C22C29/04C23C8/64
Inventor 郭智兴熊计叶俊镠
Owner SICHUAN UNIV
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