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Preparation method of surface self-lubricating ti(c,n) based cermet based on carbon migration

A technology of ceramic preparation and cermet, applied in metal material coating process, solid diffusion coating, coating and other directions, can solve the problems of long carburizing time, low efficiency, grain growth, etc., to improve the carburizing efficiency , the process is simple, the effect of small particle size

Active Publication Date: 2018-10-02
SICHUAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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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 amorphous Si-C-O is coated with TiH 2 core / shell structure powder, graphene, Na 2 CO 3 The hydrogen-containing carburizing medium is formed by uniform mixing during mixed planetary ball milling, and then the porous green body is placed in the carburizing medium and compacted, and finally the surface self-lubricating Ti(C,N) matrix is ​​prepared based on carbon migration during liquid phase sintering. Cermet

Method used

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  • Preparation method of surface self-lubricating ti(c,n) based cermet based on carbon migration

Examples

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example 1

[0017] Example 1: Surface self-lubricating Ti(C,N)-based cermets were prepared according to the following steps:

[0018] (1) Preparation of the release agent cermet green body: Weigh various raw material powder ingredients by weight percentage, of which Ni accounts for 15wt%, Mo 2 C accounts for 10wt%, WC accounts for 5%, TiC 0.7 N 0.3 as the balance; mix the weighed powder and pass through 28h ball milling, 400-mesh sieve filtration, drying at 100°C, mixing 80% of the weight of the cermet powder into a butadiene 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 650°C for 2 hours, the heating rate is 1°C / min, and the vacuum degree is 20Pa, forming a cermet green body with a porosity of 38% and removing the forming agent;

[0019] (2) Preparation of hydrogen-containing carburizing medium: first weigh TiH with a particle size of 0.5 μm 2 The powder is added to absolute ethanol to form T...

example 2

[0022] Example 2: Prepare surface self-lubricating Ti(C,N)-based cermets according to the following steps:

[0023] (1) Preparation of the release agent cermet green body: Weigh various raw material powder ingredients by weight percentage, of which Ni accounts for 20wt%, Co accounts for 5wt%, Mo 2 C accounts for 8wt%, WC accounts for 5wt%, TiC 0.7 N 0.3 as the balance; mix the weighed powder and pass through 72h ball milling, 400-mesh sieve filtration, drying at 85°C, adding 70% of the weight of the cermet powder into a butadiene 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 650°C for 4h, the heating rate is 4°C / min, and the vacuum degree is 10Pa, forming a cermet green body with a porosity of 29% and a molding agent removed;

[0024] (2) Preparation of hydrogen-containing carburizing medium: first weigh TiH with a particle size of 0.5 μm 2 The powder is added to absolute ethanol t...

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Abstract

The invention discloses a preparation method of self-lubricating surface Ti (C, N)-based metal ceramic based on carbon migration. The method is characterized by comprising the following steps: firstly performing heat preservation for 2 to 4h at 500 to 700 DEG C, so as to form a metal ceramic body with the porosity being 25 to 40 percent and a shaping agent being removed; then mixing a core / shell structure powder of amorphous Si-C-O coated TiH2, graphene with the thickness being smaller than 3nm, the number of layers being smaller than 3 and the specific surface area being greater than 250m2 / g, and Na2CO3 according to a weight percentage of 2:1:1, so as to a hydrogen-containing carburizing medium; embedding the metal ceramic body into the hydrogen-containing carburizing medium, and performing compaction at 5 to 15MPa; and finally performing liquid-phase sintering, so as to prepare the self-lubricating surface Ti (C, N)-based metal ceramic. The method solves the problems of serious crystal grain growth, long carburizing time and low efficiency in the prior art, and realizes the preparation of the self-lubricating surface Ti (C, N)-based metal ceramic during a sintering process.

Description

technical field [0001] The invention relates to a method for preparing a cermet material, in particular to a method for preparing a surface self-lubricating Ti(C,N)-based cermet based on carbon migration, and belongs to the field of composite materials. Background technique [0002] Ti(C,N) cermet has successfully replaced WC in many processing occasions due to its better red hardness, lower corrosion, thermal conductivity and friction coefficient, and better anti-sticking ability than WC-based cemented carbide. Carbide. Surface self-lubricating cermets can be prepared by surface carburizing, which can further improve their anti-friction and wear properties. CN94119863.4 discloses a carburizing method for ceramic materials. Ceramic (Al 2 o 3 , ZrO 2 Or oxide series) immersed in HF solution, in order to carry out surface treatment to 0.01μm ~ 100μm; put the above-mentioned surface-treated ceramic material into a quartz tube, and then transfer it to a carburizing furnace;...

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 熊计郭智兴刘俊波
Owner SICHUAN UNIV
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