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Preparation method of cermet wear-resistant material based on carbide-forming elements promoting carbon migration

A technology of cermets and wear-resistant materials, applied in the field of wear-resistant materials, can solve problems such as low efficiency, long carburizing time, and grain growth, and achieve the effects of simple process, improved carburizing efficiency, and small particle size

Active Publication Date: 2018-10-02
SICHUAN UNIV
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  • Abstract
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  • Claims
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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 in the current preparation of cermet wear-resistant materials, the present invention proposes to firstly prepare a cermet blank containing carbide-forming elements body, and then Al 2 o 3 coated TiH 2 core / shell structure powder, graphene, Na 2 CO 3 During 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 liquid-phase sintering is based on carbide-forming elements to promote carbon migration to realize the preparation of cermet wear-resistant materials

Method used

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  • Preparation method of cermet wear-resistant material based on carbide-forming elements promoting carbon migration

Examples

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Effect test

example 1

[0020] Example 1: Prepare cermet wear-resistant material according to the following steps:

[0021] (1) Preparation of cermet blanks containing carbide-forming elements: Weigh various raw material powder ingredients, Ni accounts for 5wt%, Co accounts for 8wt%, Mo accounts for 2wt%, W accounts for 6wt%, TiC 0.7 N 0.3 As the balance; mix the weighed powder and after 42 hours of ball milling, filter with a 400-mesh screen, dry at 85°C, mix 70% of the weight of the cermet powder into a butadiene rubber molding agent, and press under a pressure of 300MPa to obtain a metal Ceramic green body; the cermet green body is heated to 580°C in a vacuum sintering furnace, the heating rate is 2°C / min, the vacuum degree is 6Pa, and it is kept for 1 hour to form a cermet green body containing carbide-forming elements;

[0022] (2) Preparation of hydrogen-containing carburizing medium: first weigh TiH with a particle size of 1.1 μm 2 The powder is added to absolute ethanol to form TiH 2 Accou...

example 2

[0025] Example 2: Prepare cermet wear-resistant material according to the following steps:

[0026] (1) Preparation of cermet body containing carbide-forming elements: Weigh various raw material powder ingredients, Ni accounts for 15wt%, Co accounts for 10wt%, Mo accounts for 3wt%, W accounts for 2wt%, 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 90°C, mix 110% of the weight of the cermet powder into a butadiene rubber molding agent, and press under a pressure of 400MPa to obtain a metal Ceramic green body; the cermet green body is heated up to 700°C in a vacuum sintering furnace, the heating rate is 5°C / min, the vacuum degree is 8Pa, and it is kept for 2 hours to form a cermet green body containing carbide-forming elements;

[0027] (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 form TiH ...

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Abstract

The invention discloses a preparation method of metal ceramic wear resistant material based on carbide forming elements promoting carbon migration. 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 the carbide forming elements; then mixing core / shell structure powder of Al2O3 coated TiH2, graphene with the thickness being smaller than 3 nm, the number of layers being smaller than 3 and the specific surface area being greater than 250 m<2> / g, and Na2CO3 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 metal ceramic wear resistant material based on the carbide forming elements promoting carbon migration. 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 metal ceramic wear resistant material during a sintering process.

Description

technical field [0001] The invention relates to a method for preparing a wear-resistant material, in particular to a method for preparing a cermet wear-resistant material based on carbide-forming elements promoting carbon migration, and belongs to the field of wear-resistant materials. Background technique [0002] Ti(C,N)-based cermets not only have high hardness, wear resistance, red hardness, excellent chemical stability and extremely low coefficient of friction with metals, but also have certain toughness and strength. The global titanium (Ti) reserves are about 1000 times that of W reserves. Compared with cemented carbide materials that use W strategic resources, they have relative resource advantages, so Ti(C,N)-based cermet materials have huge market prospects. When used as a wear-resistant material, if a solid lubricating phase such as graphite can be introduced on its surface, its wear can be further reduced and its service life can be improved. [0003] CN20091003...

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 郭智兴熊计周黎明
Owner SICHUAN UNIV
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