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Preparation method of multi-scale spherical-grain hard alloy material

A technology of cemented carbide and spherical crystals, which is applied in metal processing equipment, coating, transportation and packaging, etc., can solve the problems that are difficult to effectively solve the problem of tungsten carbide phase sharp angle effect in the cemented carbide structure, and achieve the purpose of suppressing grains The effect of growing up

Active Publication Date: 2019-08-16
SHAANXI SCI TECH UNIV
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Problems solved by technology

[0004] The present invention aims at the present situation in the field of research and development where it is difficult to effectively solve the problem of the sharp angle effect of the tungsten carbide phase in the cemented carbide structure by common means, and provides a method for preparing a multi-scale spherical crystal cemented carbide material

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  • Preparation method of multi-scale spherical-grain hard alloy material
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preparation example Construction

[0019] A kind of preparation method of multi-scale spherical crystal cemented carbide material of the present invention, comprises the following steps:

[0020] (1) The reduced tungsten carbide powder is subjected to positive pressure shear micro-grinding treatment, the positive pressure is 12-25MPa, the shear force is 7-15MPa, and then selective nano-cobalt plating is carried out. The plating steps include palladium, ammoniation and micro-grinding. Plating, the concentration of cobalt nitrate in the plating solution is 3 to 6mol / L, and the plating temperature is 55 to 85°C to obtain a local cobalt film wrapped polygonal tungsten carbide composite powder;

[0021] (2) Partial cobalt film-wrapped polygonal tungsten carbide composite powder is added to 60% SAN180# gasoline solution for roller milling and granulation. The mass ratio of powder to glue is (87.6-95.1): (4.9-12.4), and high-temperature steady-state recrystallization after degreasing Treatment, the degreasing temperat...

Embodiment 1

[0026] (1) The reduced tungsten carbide powder is subjected to positive pressure shearing and micro-grinding treatment, positive pressure 15MPa, shear force 15MPa, and then selective nano-cobalt plating, the plating step includes palladium, ammoniation and microplating, plating solution The concentration of cobalt nitrate in the medium is 3mol / L, and the plating temperature is 55°C to obtain a partial cobalt film-wrapped polygonal tungsten carbide composite powder;

[0027] (2) Partial cobalt film-wrapped polygonal tungsten carbide composite powder is added to 60% SAN180# gasoline solution for roller milling and granulation. The mass ratio of powder to glue is 87.6:12.4. After degreasing, high-temperature steady-state recrystallization treatment is carried out. The degreasing temperature is 550°C. The high-temperature steady-state recrystallization treatment temperature is 1280°C, the average heating and cooling rate is 1.4°C / min, and the holding time is 8 hours to obtain multi...

Embodiment 2

[0030] (1) The reduced tungsten carbide powder is subjected to positive pressure shear micro-grinding treatment, the positive pressure is 13MPa, the shear force is 8MPa, and then selective nano-cobalt plating is carried out. The plating steps include palladium, ammoniation and microplating, and the plating solution The concentration of cobalt nitrate in the medium is 4mol / L, and the plating temperature is 65°C to obtain a partial cobalt film-wrapped polygonal tungsten carbide composite powder;

[0031] (2) Partial cobalt film-wrapped polygonal tungsten carbide composite powder is added to 60% SAN180# gasoline solution for roller milling and granulation. The mass ratio of powder to glue is 89:11. After degreasing, high-temperature steady-state recrystallization treatment is carried out. The degreasing temperature is 550°C. The high-temperature steady-state recrystallization treatment temperature is 1380°C, the average heating and cooling rate is 1.6°C / min, and the holding time i...

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Abstract

The invention discloses a preparation method of a multi-scale spherical-grain hard alloy material. The preparation method comprises the steps that tungsten carbide powder is reduced through positive-pressure shearing and micro-grinding treatment, then selective nano-cobalt plating is conducted, a gelling material is added into obtained polygonal tungsten carbide composite powder locally wrapped with a cobalt film for grinding and pelletizing, high-temperature steady-state re-crystallization is conducted after degreasing; and finally, the powder is placed in an over-pressure heat-collection vacuum device to be sintered and molded, so that a multi-scale multi-layer interface hard alloy material is obtained. The preparation method of the multi-scale spherical-grain hard alloy material has theadvantages that the component control precision is high, the process stability and repeatability are high, high strength and toughness of the hard alloy materials are achieved, and the long service life of the hard alloy material is also achieved.

Description

technical field [0001] The invention relates to the technical field of hard alloy preparation, in particular to a preparation method of a multi-scale spherical crystal hard alloy material. Background technique [0002] Cemented carbide materials use polygonal tungsten carbide as the main hard phase, and the sharp corners of tungsten carbide grains are difficult to disappear during the firing process, resulting in stress concentration at the sharp corners and easy cracks. If the sharp corners are eliminated by long-term liquid phase sintering, it will cause serious growth of tungsten carbide grains and deteriorate the properties of the alloy. Therefore, finding a new method to solve the sharp angle effect of the tungsten carbide phase in the cemented carbide structure is very important for improving its performance. [0003] Through the preparation of multi-scale spherical powder, recrystallization treatment and optimization of firing process, giving full play to the strengt...

Claims

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Application Information

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IPC IPC(8): B22F1/02B22F9/04B22F3/14B22F1/00C22C1/05C22C29/08
CPCB22F9/04B22F3/14C22C1/051C22C29/08B22F2009/047B22F2998/10B22F1/17B22F1/145B22F1/142
Inventor 董洪峰
Owner SHAANXI SCI TECH UNIV
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