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Method for manufacturing gradient hard composite coating on surface of hard alloy

A composite coating, cemented carbide technology, applied in metal material coating process, coating, superimposed layer plating and other directions, can solve the complex process, long processing time and preparation process, not conducive to large-scale industrial production and other problems, to achieve the effect of shortening the process time, excellent bonding strength of the film base, and reducing the cost

Active Publication Date: 2016-03-09
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This makes the processing time and preparation process longer, and the process becomes complicated, so it is not conducive to the needs of large-scale industrial production

Method used

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  • Method for manufacturing gradient hard composite coating on surface of hard alloy

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Refractory Metal Titanium Ti

[0022] The method for preparing the gradient hard composite coating on the surface of the cemented carbide of the present invention specifically comprises the following steps:

[0023] 1) Prepare Ti and TiC composite infiltration layer on the surface of cemented carbide: ultrasonically clean the cemented carbide workpiece with deionized water and alcohol respectively, dry it with hot air, and place the cleaned cemented carbide workpiece in double-layer glow plasma On the substrate table of the body surface alloying equipment, a composite target made of Ti wire and graphite plate is used as the source, and the distance between the upper surface of the hard alloy workpiece and the target is controlled to be 18mm, and the double-layer glow plasma is When the surface alloying equipment is vacuumed below 1Pa, argon gas is introduced as the protective gas and plasma excitation gas, the flow rate is 70sccm, the internal pressure of the equipment ...

Embodiment 2

[0028] The refractory metal is tungsten W

[0029] The method for preparing the gradient hard composite coating on the surface of the cemented carbide of the present invention specifically comprises the following steps:

[0030] 1) Prepare W and W on the surface of cemented carbide x C (WC / W 2 C) Composite infiltration layer: Carbide workpieces are ultrasonically cleaned with deionized water and alcohol respectively, dried with hot air, and the cleaned carbide workpieces are placed on the substrate table of the double-layer glow plasma surface alloying equipment First, use the composite target made of W wire and graphite plate as the source, control the distance between the upper surface of the cemented carbide workpiece and the target to 20mm, and wait for the double-layer glow plasma surface alloying equipment to evacuate to below 1Pa At the same time, argon gas is introduced as the protective gas and plasma excitation gas, the flow rate is 80sccm, the internal pressure of...

Embodiment 3

[0034] The refractory metal is Hf

[0035] 1) Prepare Hf and HfC composite infiltration layer on the surface of cemented carbide: ultrasonically clean the cemented carbide workpiece with deionized water and alcohol respectively, dry it with hot air, and place the cleaned cemented carbide workpiece in double-layer glow plasma On the substrate stage of the body surface alloying equipment, a composite target made of Hf wire and graphite plate is used as the source, and the distance between the upper surface of the hard alloy workpiece and the target is controlled to be 19mm, and the double-layer glow plasma When the surface alloying equipment is evacuated below 1Pa, argon gas is introduced as the protective gas and plasma excitation gas. The temperature of the cemented carbide workpiece is raised to 850°C, and the treatment time is 20 minutes, and a Hf / HfC composite infiltrated layer with a depth of about 3 μm is formed on the surface of the cemented carbide;

[0036] 2) Prepara...

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Abstract

The invention relates to a method for manufacturing a gradient hard composite coating on the surface of a hard alloy. A dual-layer glow plasma surface alloying device is used, argon serves as plasma stimulation gas, a composite target manufactured through a refractory metal wire and a graphite plate serves as a source electrode, and refractory metal and a carbide composite cementation layer of the refractory metal are manufactured on the surface of the hard alloy; then mixed gas of tetramethylsilane and hydrogen is led in, and the gradient composite coating comprising refractory metal carbide and silicon carbide is prepared by continuously increasing the flow of the tetramethylsilane; and finally methane is led in, the flow of the methane is gradually increased, the flow of the tetramethylsilane is reduced at the same time, and the silicon carbide and diamond gradient hard composite coating is prepared. The coating prepared with the method and a base body are in metallurgical bonding, the coefficients of thermal expansion from the base body to the coating are distributed in a gradient manner, and the method has the characteristics of being small in stress, high in binding intensity and the like. Meanwhile, the overall coating is continuously prepared in one device, the process is simple, and the cost is low.

Description

technical field [0001] The invention belongs to the technical field of coating preparation, in particular to a method for preparing gradient hard composite coating on the surface of hard alloy. Background technique [0002] With the development of modern industry and manufacturing technology, the mechanical processing industry is developing in the direction of high precision, high speed cutting, dry cutting, and low cost. People have put forward higher and higher requirements for cemented carbide tools. In order to better improve the cutting performance of the tool and meet various service requirements, people use various coating technologies to coat one or more layers of high hardness and high wear resistance materials on the surface of cemented carbide. A coated tool composed of one or more layers of metal or non-metal compound films with high hardness and good wear resistance is coated on the tool substrate, which can combine the high strength of cemented carbide and the ...

Claims

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Application Information

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IPC IPC(8): C23C28/04
CPCC23C28/048
Inventor 于盛旺高洁王荣张阿莉黑鸿君申艳艳刘小萍贺志勇
Owner TAIYUAN UNIV OF TECH
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