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In-Situ Preparation Method of Ti(c,n)-Based Cermet Surface Carburized Layer

A cermet and ceramic surface technology, applied in metal processing equipment, metal material coating technology, coating, etc., can solve the problems of low efficiency, long carburizing time, grain growth, etc., achieve simple process, improve carburizing Carbon efficiency, effect of small particle size

Active Publication Date: 2018-09-28
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention aims at the problems of severe grain growth, long carburizing time and low efficiency in the "sintering + carburizing" process when preparing the carburized layer on the surface of Ti(C,N)-based cermet. The compact is removed from the molding agent to form a porous green body, and then the amorphous Si-C-O is coated with TiH 2 The core / shell structure powder and nano-graphite mixed planetary ball mill are 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 in-situ formation of Ti(C ,N)-based cermet surface carburized layer

Method used

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  • In-Situ Preparation Method of Ti(c,n)-Based Cermet Surface Carburized Layer

Examples

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Effect test

example 1

[0020] Example 1: Prepare Ti(C,N)-based cermet surface carburized layer in situ according to the following steps:

[0021] (1) Preparation of cermet body containing carbide-forming elements: Weigh various raw material powder ingredients, Ni accounts for 5wt%, Co accounts for 10wt%, Mo accounts for 2wt%, W accounts for 2wt%, TiC 0.7 N 0.3 As the balance; mix the weighed powder and pass through 35h ball milling time, filter with 400 mesh screen, dry at 87°C, mix 70% of the weight of the cermet powder into the sodium-butadiene rubber molding agent, and press molding under the pressure of 310MPa to obtain metal Ceramic green body; the cermet green body is heated to 500°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 0.5 μm 2 The powder is added...

example 2

[0025] Example 2: Prepare Ti(C,N)-based cermet surface carburized layer in situ 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 5wt%, Mo accounts for 2wt%, W accounts for 3wt%, TiC 0.7 N 0.3 as the balance; mix the weighed powder and after 70h of ball milling time, filter through a 400-mesh screen, dry at 100°C, add 120% of the weight of the cermet powder into the sodium-butadiene rubber molding agent, and press molding under a pressure of 380MPa to obtain a metal Ceramic green body; the cermet green body is heated to 700°C in a vacuum sintering furnace, the heating rate is 5°C / min, the vacuum degree is 11Pa, 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 0.7 μm 2 The powder is ...

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Abstract

The invention discloses an in-situ preparation method for a carburized layer on the surface of a Ti(C,N)-based cermet, which is characterized in that it is firstly kept at 500-700°C for 1-2 hours to form a cermet green body containing carbide-forming elements ; Then amorphous Si-C-O-coated TiH2 core / shell structure powder, two materials of nano-graphite with a particle size of 30~50nm are mixed by weight percentage 3:2 to prepare a hydrogen-containing carburizing medium; then the green body is buried into the hydrogen-containing carburizing medium and compacted under a pressure of 5-15MPa; finally, liquid-phase sintering is carried out to form a Ti(C,N)-based cermet surface carburized layer in situ. The invention overcomes the problems of serious grain growth, long carburizing time and low efficiency in the existing technology, and realizes in-situ preparation of the carburized layer on the surface of Ti(C,N)-based cermet during the sintering process.

Description

technical field [0001] The invention relates to a method for preparing a carburized layer, in particular to an in-situ method for preparing a carburized layer on the surface of a Ti(C,N)-based cermet, 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 mass fr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C29/04C22C30/00C22C32/00C22C1/05B22F3/10C23C8/64
CPCC22C1/05C22C1/051C22C29/005C22C29/04C22C30/00C22C32/0089C23C8/64B22F3/1007B22F3/1035B22F2999/00B22F2998/10B22F2201/30B22F3/1021B22F2201/20B22F1/10B22F3/02
Inventor 郭智兴熊计叶俊镠
Owner SICHUAN UNIV
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