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A kind of in-situ preparation method of surface carburizing cemented carbide

A cemented carbide and surface carburizing technology, applied in the field of cemented carbide preparation and in-situ preparation of surface carburized cemented carbide, can solve the problems of grain growth, long carburizing time, low efficiency, etc. Small size, improved carburizing efficiency and simple process

Active Publication Date: 2018-10-02
SICHUAN UNIV
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  • 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 in the preparation of surface carburized hard alloys, the present invention proposes to prepare hard alloys containing carbide-forming elements first. Alloy body, and then Al 2 o 3 coated TiH 2 Core / shell structure powders, multi-walled carbon nanotubes, BaCO 3 The hydrogen-containing carburizing medium is uniformly mixed during the mixed planetary ball mill, and then the porous green body is put into the carburizing medium and compacted, and finally the in-situ preparation of the surface carburized cemented carbide is realized during the liquid phase sintering

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  • A kind of in-situ preparation method of surface carburizing cemented carbide

Examples

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example 1

[0020] Example 1: Realize the in-situ preparation of surface carburized cemented carbide according to the following steps:

[0021] (1) Preparation of cemented carbide blanks containing carbide-forming elements: Weigh various raw material powder ingredients, Co accounts for 6wt%, Mo accounts for 1wt%, W accounts for 1wt%, and WC is the balance; The powder is mixed and ball milled for 32 hours, filtered with a 400-mesh screen, dried at 90°C, mixed with a butadiene rubber molding agent according to 70% of the weight of the cemented carbide powder, and pressed under a pressure of 310MPa to obtain a cemented carbide green body; The alloy green body is heated to 570°C in a vacuum sintering furnace, the heating rate is 2°C / min, the vacuum degree is 6Pa, and it is kept for 1h to form a cemented carbide body containing carbide forming elements;

[0022] (2) Preparation of hydrogen-containing carburizing medium: first weigh TiH with a particle size of 0.6 μm 2 The powder is added to a...

example 2

[0025] Example 2: Realize the in-situ preparation of surface carburized cemented carbide according to the following steps:

[0026] (1) Preparation of cemented carbide blanks containing carbide-forming elements: Weigh various raw material powder ingredients, Co accounts for 15wt%, W accounts for 2wt%, and WC is the balance; the weighed powders are mixed and passed through Ball mill for 52 hours, filter with 400-mesh screen, dry at 95°C, mix 110% of the weight of cemented carbide powder with butadiene rubber molding agent, and press molding under 400MPa pressure to obtain a cemented carbide green body; the cemented carbide green body is vacuum In the sintering furnace, the temperature is raised to 680°C, the temperature rise rate is 4°C / min, the vacuum degree is 12Pa, and the temperature is kept for 2 hours to form a cemented carbide blank containing carbide-forming elements;

[0027] (2) Preparation of hydrogen-containing carburizing medium: first weigh TiH with a particle siz...

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Abstract

The invention discloses an in-situ preparation method of surface carburized hard alloy, which is characterized in that it first heats the temperature at 550-700°C for 1-2 hours to form a hard alloy body containing carbide-forming elements; then wraps Al2O3 TiH2-coated core / shell structure powder, multi-walled carbon nanotubes with an outer diameter of less than 8nm, a length of less than 30μm and a specific surface area greater than 350m2 / g, and BaCO3 are mixed at a weight percentage of 2:3:1 to prepare hydrogen-containing carburizing medium; then embed the green body in a hydrogen-containing carburizing medium and compact it under a pressure of 5-15 MPa; finally, carry out liquid phase sintering to prepare a surface carburized cemented carbide. The invention overcomes the problems of serious crystal grain growth, long carburizing time and low efficiency in the existing technology, and realizes in-situ preparation of surface carburized hard alloy in the sintering process.

Description

technical field [0001] The invention relates to a preparation method of hard alloy, in particular to an in-situ preparation method of surface carburized hard alloy, which belongs to the field of hard materials. Background technique [0002] The composition and performance of traditional hard alloys are basically the same from the outside to the inside, which limits the application of traditional hard alloy materials. This internal contradiction existing in cemented carbide can be resolved by adopting new material preparation technology and changing the distribution characteristics of cemented carbide microstructure. Through surface carburizing, its surface can be used to realize self-lubrication and improve its surface friction and wear performance. [0003] CN104493161A discloses a method for carburizing cemented carbide in a vacuum sintering furnace, comprising the following steps: a. putting each cemented carbide decarburized product into a bag containing a carburizing m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C29/08C22C1/05B22F3/10C23C8/64
CPCC22C1/051C22C29/067C22C29/08C23C8/64B22F3/1007B22F3/1035B22F2999/00B22F2998/10B22F2201/30B22F3/1021B22F2201/20B22F1/10B22F3/02
Inventor 郭智兴熊计陈诚
Owner SICHUAN UNIV
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