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Method for chemical plating of nickel phosphide-diamond composite coating on surface of hard alloy substrate

A cemented carbide and substrate surface technology, applied in the field of chemical plating, can solve the problems of complex method, uneven growth of composite coating, easy to fall off, etc., to achieve the effect of improving growth rate, enhancing the growth tightness of coating and good holding force

Active Publication Date: 2019-03-08
BEIJING INSTITUTE OF TECHNOLOGYGY
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Problems solved by technology

[0003] Zhang Fenglin of Guangdong University of Technology prepared nickel-phosphide (Ni-P) diamond composite coating on the surface of 20# steel base material, and found that the hardness of the composite coating was high, reaching 1261HV, which improved the wear resistance of the alloy material, but the composite coating The growth of carbon steel is limited to the surface of carbon steel base materials with low hardness and low rigidity. When the hardness or rigidity of the base is high, it is easy to fall off; for this reason, researchers such as Hiromichi Onikura of Kyushu University in Japan prepared micro-grinding wheels with cemented carbide as the base material. When the surface wear-resistant coating is applied, a layer of nickel metal is electroplated on the cemented carbide substrate as a transition layer, and then the wear-resistant coating is prepared on the transition layer by electroless plating.
Although this method improves the bonding strength between the wear-resistant layer and the substrate, the method is complicated, and the resulting composite coating grows unevenly

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  • Method for chemical plating of nickel phosphide-diamond composite coating on surface of hard alloy substrate

Examples

Experimental program
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Effect test

Embodiment 1

[0059] Components and concentrations in the acidic nickel phosphide-diamond electroless plating solution used in this embodiment are: 0.09mol / L nickel sulfate, 0.2mol / L sodium hypophosphite, 0.25mol / L lactic acid, 0.024mol / L propionic acid, 1.5x10 -5 mol / L thiourea and acid-modified diamond particles with a content of 7g / L, the solvent is water, and the pH value is 4.7;

[0060] Wherein the acid-modified diamond particles are modified by the following method: after immersing diamond particles with a particle size of 3.5 microns in a sulfuric acid solution with a mass concentration of 5% for 8 hours, washing and filtering with water in turn to obtain acid-modified diamond particles .

[0061] 1) Grinding the cylindrical surface of the cemented carbide grinding wheel base with a diamond grinding wheel on a precision tool grinder to obtain a surface with a roughness of Ra1.5;

[0062] 2) Clean the ground carbide grinding wheel base ultrasonically with acetone for 3 minutes, the...

Embodiment 2

[0069] Components and concentrations in the acidic nickel phosphide-diamond electroless plating solution used in this embodiment are: 0.07mol / L nickel sulfate, 0.15mol / L sodium hypophosphite, 0.22mol / L lactic acid, 0.02mol / L propionic acid, 1x10 -5 mol / L thiourea and acid-modified diamond particles with a content of 5g / L, the solvent is water, and the pH value is 4.7;

[0070] Wherein the acid-modified diamond particles are modified by the following method: after immersing diamond particles with a particle size of 1 micron in a sulfuric acid solution with a mass concentration of 5% for 8 hours, washing and filtering with water in turn to obtain acid-modified diamond particles .

[0071] 1) Grinding the cylindrical surface of the cemented carbide grinding wheel base with a diamond grinding wheel on a precision tool grinder to obtain a surface with a roughness of Ra1.5;

[0072] 2) Clean the ground carbide grinding wheel base ultrasonically with acetone for 3 minutes, the powe...

Embodiment 3

[0078] Components and concentrations in the acidic nickel phosphide-diamond electroless plating solution used in this embodiment are: 0.12mol / L nickel sulfate, 0.24mol / L sodium hypophosphite, 0.32mol / L lactic acid, 0.028mol / L propionic acid, 1x10 -5 mol / L thiourea and acid-modified diamond particles with a content of 7g / L, the solvent is water, and the pH value is 4.7;

[0079] Wherein the acid-modified diamond particles are modified by the following method: after immersing diamond particles with a particle size of 2 microns in a sulfuric acid solution with a mass concentration of 5% for 8 hours, washing and filtering with water in turn to obtain acid-modified diamond particles .

[0080] 1) Grinding the cylindrical surface of the cemented carbide grinding wheel base with a diamond grinding wheel on a precision tool grinder to obtain a surface with a roughness of Ra0.5;

[0081] 2) Clean the ground carbide grinding wheel base ultrasonically with acetone for 3 minutes, the po...

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Abstract

The invention provides a method for chemical plating of a nickel phosphide-diamond composite coating on the surface of a hard alloy substrate, and belongs to the technical field of chemical plating. The method comprises the steps that the hard alloy substrate is pretreated, and thus an activated hard alloy substrate is obtained; and then the activated hard alloy substrate is chemically plated in an acid nickel phosphide-diamond chemical plating solution, and thus the nickel phosphide-diamond composite coating is formed. The experiment result shows that diamond particles in the nickel phosphide-diamond composite coating prepared through the method are distributed evenly, and the binding force between the coating and the hard alloy substrate reaches 28 MPa.

Description

technical field [0001] The invention belongs to the technical field of chemical plating, and in particular relates to a method for chemically plating a nickel phosphide-diamond composite coating on the surface of a hard alloy substrate. Background technique [0002] Cemented carbide is an alloy material made of high hardness, high melting point hard metal carbide and binder cobalt (Co) through powder metallurgy process. It has high hardness and is often used as tool material . When cemented carbide is used as a tool material, cemented carbide is usually used as a base material, and then a functional coating with a certain mechanical strength is prepared on the surface of the cemented carbide, and then prepared into a micro-knife, a functional abrasive, etc., to improve the hardness. The application value of high quality alloy. [0003] Zhang Fenglin of Guangdong University of Technology prepared nickel-phosphide (Ni-P) diamond composite coating on the surface of 20# steel ...

Claims

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Application Information

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IPC IPC(8): C23C18/36C23C18/18
CPCC23C18/1837C23C18/36
Inventor 周天丰贺裕鹏于谦梁志强焦黎王西彬
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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