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

A ceramic preparation and cermet technology, which is applied in the field of composite materials, can solve the problems of long carburizing time, grain growth, and low efficiency, and achieve the effects of improving carburizing efficiency, small particle size, and simple process

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

[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 Al 2 o 3 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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  • Preparation method of surface self-lubricating ti(c,n)-based cermet based on metal hydride

Examples

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example 1

[0019] Example 1: Surface self-lubricating Ti(C,N)-based cermets were prepared according to the following steps:

[0020] (1) Preparation of cermet body containing carbide-forming elements: Weigh various raw material powder ingredients, Ni accounts for 12wt%, Co accounts for 10wt%, Mo accounts for 2wt%, W accounts for 8wt%, TiC 0.7 N 0.3 as the balance; mix the weighed powders and ball mill for 65 hours, filter them through a 400-mesh screen, dry them at 95°C, mix 85% of the weight of the cermet powder into a butadiene rubber molding agent, and press them under a pressure of 400MPa to obtain metal Ceramic green body; the cermet green body is heated up to 600°C in a vacuum sintering furnace, the heating rate is 2°C / min, the vacuum degree is 10Pa, and it is kept for 1 hour to form a cermet green body containing carbide-forming elements;

[0021] (2) Preparation of hydrogen-containing carburizing medium: first weigh TiH with a particle size of 0.7 μm 2 The powder is added to ab...

example 2

[0024] Example 2: Prepare surface self-lubricating Ti(C,N)-based cermets according to the following steps:

[0025] (1) Preparation of cermet body containing carbide-forming elements: Weigh various raw material powder ingredients, Ni accounts for 8wt%, Co accounts for 6wt%, Mo accounts for 4wt%, W accounts for 3wt%, TiC 0.7 N 0.3 As the balance; mix the weighed powder and pass through 62h ball milling time, filter with 400 mesh screen, dry at 91°C, mix 60% of the weight of cermet powder with Buna-Na rubber molding agent, press molding under 350MPa pressure to obtain metal Ceramic green body; the cermet green body is heated to 600°C in a vacuum sintering furnace, the heating rate is 4°C / min, the vacuum degree is 8Pa, and it is kept for 2 hours to form a cermet green body containing carbide-forming elements;

[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 ethanol to form TiH 2...

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Abstract

The invention discloses a preparation method of self-lubricating surface Ti (C, N)-based metal ceramic based on a metal hydride. The method is characterized by comprising the following steps: firstly performing heat preservation for 1 to 2 h at 500 to 700 DEG C, so as to form a metal ceramic body containing carbide forming elements; and then mixing core / shell structure powder of Al2O3 coated TiH2, a multiwalled carbon nanotube with the external diameter being smaller than 8 nm, the length being smaller than 30 micrometers and the specific surface area being greater than 350 m<2> / g, and NaHCO3 according to a weight percentage of 3:2:1, so as to prepare a hydrogen-containing carburizing medium; embedding the metal ceramic body into the hydrogen-containing carburizing medium, and performing compaction at 5 to 15 MPa; and finally performing liquid-phase sintering, so as to prepare the self-lubricating surface Ti (C, N)-based metal ceramic. The method overcomes 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 Ti(C,N)-based cermet, in particular to a method for preparing a surface self-lubricating Ti(C,N)-based cermet based on a metal hydride, and belongs to the field of composite materials. Background technique [0002] The composite material prepared by at least one ceramic phase and metal phase by powder metallurgy is called cermet. Usually what we call cemented carbide, steel-bonded cemented carbide, etc. should all belong to this category. However, in the field of engineering, in order to distinguish it from ordinary cemented carbide, etc., only Ti(C,N) (addition of other carbides) materials bonded with Ni and / or Co are called cermets. In order to improve the overall performance of cermets, carburizing treatment is usually carried out on its surface. [0003] CN200910032962.4 discloses a Ti(C,N)-based cermet reinforced by carbon nanotubes with a gradient structure and a preparation method thereof. The...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C29/04C22C1/05C22C1/10
CPCC22C1/055C22C29/005C22C29/04
Inventor 熊计郭智兴刘俊波
Owner SICHUAN UNIV
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