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Preparation method of surface self-lubricating ti(c,n)-based cermets formed in situ with carbon gradient

A technology for the preparation of cermets and ceramics, which is applied in the direction of metal material coating process, solid-state diffusion coating, coating, etc., can solve the problems of long carburizing time, grain growth, low efficiency, etc., and improve carburizing efficiency , small particle size and simple process

Active Publication Date: 2019-01-18
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 materials, the present invention proposes to prepare metals containing carbide-forming elements first. Ceramic body, and then SiO 2 coated TiH 2 core / shell powder, multi-walled carbon nanotubes, BaCO 3 The mixed planetary ball mill 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 self-lubricating Ti(C,N)-based cermet is prepared during liquid phase sintering

Method used

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  • Preparation method of surface self-lubricating ti(c,n)-based cermets formed in situ with carbon gradient

Examples

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Effect test

example 1

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

[0019] (1) Preparation of cermet body containing carbide-forming elements: Weigh various raw material powder ingredients, Ni accounts for 8wt%, Co accounts for 7wt%, Mo accounts for 3wt%, W accounts for 4wt%, TiC 0.7 N 0.3 As the balance; mix the weighed powder and after 28 hours of ball milling, filter with a 400-mesh screen, dry at 100°C, mix 90% of the weight of the cermet powder into a butadiene rubber molding agent, and press under a pressure of 320MPa to obtain a metal Ceramic green body; the cermet green body is heated to 540°C in a vacuum sintering furnace, the heating rate is 2°C / min, the vacuum degree is 7Pa, and it is kept for 1 hour to form a cermet green body containing carbide-forming elements;

[0020] (2) Preparation of hydrogen-containing carburizing medium: first weigh TiH with a particle size of 0.6 μm 2 The powder is added to absolute ethanol to fo...

example 2

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

[0024] (1) Preparation of cermet body containing carbide-forming elements: Weigh various raw material powder ingredients, Ni accounts for 12wt%, Co accounts for 5wt%, Mo accounts for 4wt%, W accounts for 4wt%, TiC 0.7 N 0.3 as the balance; mix the weighed powder and after 72 hours of ball milling, filter through a 400-mesh screen, dry at 88°C, mix 100% of the weight of the cermet powder with a sodium-butadiene rubber molding agent, and press under a pressure of 390MPa to obtain a metal Ceramic green body; the cermet green body is heated to 630°C in a vacuum sintering furnace, the heating rate is 1°C / min, the vacuum degree is 5Pa, and it is kept for 1h to form a cermet green body containing carbide-forming elements;

[0025] (2) Preparation of hydrogen-containing carburizing medium: first weigh TiH with a particle size of 0.8 μm 2 The powder is added to absolute ethano...

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Abstract

The invention discloses a method for preparing carbon gradient in-situ formed surface self-lubrication type Ti(C, N)-based cermet. The method for preparing carbon gradient in-situ formed surface self-lubrication type Ti(C, N)-based cermet is characterized in that firstly, the temperature is kept at 500-700 DEG C for 1-2 hours, so that a cermet green body containing a carbide forming element is formed; SiO2 core / shell structure powder covered with TiH2, multi-walled carbon nanotubes and BaCO3 are mixed according to the weight percentage ratio of 3:2:1 to be prepared into a hydrogenous carburizing medium, wherein the outer diameter of each multi-walled carbon nanotube is smaller than 8 nm, the length of each multi-walled carbon nanotube is smaller than 30 microns, and the specific surface area of each multi-walled carbon nanotube is larger than 350 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 the self-lubrication surface type Ti(C, N)-based cermet is prepared. The self-lubrication surface type Ti(C, N)-based cermet preparation method adopting carbon gradient in-situ formation solves the problems that in the prior art, grains grow severely, the carburizing time is long, and efficiency is low, and the surface self-lubrication type Ti(C, N)-based cermet is prepared based on carbon gradient in-situ formation in the sintering process.

Description

technical field [0001] The invention relates to a method for preparing a cermet, in particular to a method for preparing a surface self-lubricating Ti(C,N)-based cermet formed in situ by a carbon gradient, and belongs to the field of composite materials. Background technique [0002] Ti(C,N)-based cermet is a new type of tool and die material developed on the basis of TiC-based cermet. It is characterized by Ti(C,N) as its main hard phase. It is a material superior to ordinary WC The high-speed cutting tool material based on cemented carbide can not only be used for turning of steel and milling of steel and cast iron, but also can be used in wear-resistant and corrosion-resistant environments, and has a very broad application prospect. As a tool and mold material, its wear resistance is very critical. The formation of a high carbon gradient layer on the surface of the cermet is beneficial to reduce its friction coefficient and play a self-lubricating role. Carburizing treatm...

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 郭智兴熊计陈诚
Owner SICHUAN UNIV
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