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In-situ preparation method of Ti (C,N) based metal ceramic with self-lubricating surface

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

Active Publication Date: 2017-09-08
SICHUAN UNIV
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  • Abstract
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  • Claims
  • Application Information

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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 materials, the present invention proposes to prepare metals containing carbide-forming elements first. Ceramic body, and then SiO 2 coated TiH 2 core / shell structure powder, multi-walled carbon nanotubes, NaHCO 3 The hydrogen-containing carburizing medium is formed by uniform mixing during mixed planetary ball milling, then the porous green body is placed in the carburizing medium and compacted, and finally the surface self-lubricating Ti(C,N)-based cermet is formed in situ during liquid phase sintering

Method used

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  • In-situ preparation method of Ti (C,N) based metal ceramic with self-lubricating surface

Examples

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example 1

[0018] Example 1: Prepare surface self-lubricating Ti(C,N)-based cermets 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 5wt%, Co accounts for 5wt%, Mo 2 C accounts for 6wt%, WC accounts for 6wt%, TiC 0.7 N 0.3 as the balance; mix the weighed powders and pass through ball milling for 48 hours, filter with 400-mesh screen, dry at 90°C, mix 80% of the weight of the cermet powder into a butadiene rubber molding agent, and press at 300MPa to obtain a cermet green body ;The cermet green body is kept in a vacuum sintering furnace at 550°C for 2 hours, the heating rate is 2°C / min, and the vacuum degree is 15Pa, forming a cermet green body with a porosity of 30% 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 is added to a...

example 2

[0023] Example 2: Prepare surface self-lubricating Ti(C,N)-based cermets in situ 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 10wt%, Co accounts for 6wt%, Mo 2 C accounts for 10wt%, WC accounts for 5wt%, TiC 0.7 N 0.3 as the balance; mix the weighed powders and pass through 64h ball milling, 400-mesh sieve filtration, drying at 85°C, adding Buna-Na rubber molding agent according to 100% of the weight of the cermet powder, and pressing at 400MPa 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 2°C / min, and the vacuum degree is 10Pa, forming a cermet green body with a porosity of 25% and a molding agent removed;

[0025] (2) Preparation of hydrogen-containing carburizing medium: first weigh TiH with a particle size of 1 μm 2 The powder is added to absol...

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Abstract

The invention discloses an in-situ preparation method of Ti (C,N) based metal ceramic with a self-lubricating surface. The in-situ preparation method of Ti (C,N) based metal ceramic with self-lubricating surface is characterized by comprising the steps of firstly, keeping warm for 2 to 4h at the temperature of 500 to 650 DEG C, and forming a metal ceramic green body without a forming agent and with the porosity being 25 percent to 40 percent; then mixing SiO2-coated TiH2 core / shell structure powder, a multiwalled carbon nanotube with the outer diameter being less than 8nm, the length being less than 30mum and the specific surface area being larger than 350m<2> / g, and NaHCO3 according to the weight percent being 2:1:1 for preparing to obtain a hydrogen-containing carburizing medium; embedding the green body into the hydrogen-containing carburizing medium, and compacting under the pressure of 5 to 15MPa; and finally carrying out liquid-phase sintering so as to in-situ form the Ti (C,N) based metal ceramic with the self-lubricating surface. The in-situ preparation method provided by the invention solves the problems of severe grain growth, long carburizing time and low efficiency existed in an existing process, and the metal ceramic with the self-lubricating surface is in-situ formed during a 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, belonging to the field of composite materials. Background technique [0002] Ti(C,N)-based cermets are based on Ti(C,N), etc., Ni / Co is used as binder, and WC, Mo 2 C, TaC and other carbides are multi-phase solid materials prepared by powder metallurgy. Due to its excellent properties such as high hardness and wear resistance, it is used in wear-resistant parts. However, under harsh wear conditions such as dry friction or self-matching of homogeneous materials, cermets will still suffer severe wear. The introduction of graphite lubricating phase in metal-enhanced ceramics can reduce the friction coefficient and significantly reduce material wear. Therefore, it is an ideal way to reduce wear by carburizing the surface of cermets to obtain the surface self-lubricating phase. [0003] CN...

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 郭智兴熊计李深厚
Owner SICHUAN UNIV
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