Preparation method for high-bonding wearproof composite coating

Abstract

The invention discloses a preparation method for a high-bonding wearproof composite coating. The high-bonding wearproof composite coating is characterized in that diamond powder and silica powder are ball-milled and mixed according to a proportion of 1:(1-5); then electrophoretic liquid is added, wherein the electrophoretic liquid is prepared from water, absolute ethyl alcohol and acetone according to the mass part ratio of 1:8:1; and the mixture is subjected to ultrasonic oscillation for 10-15 minutes after being stirred with a glass rod. The prepared suspension liquid is placed on a magnetic stirrer; electrode materials are inserted, wherein the negative electrode material is graphite; an electrophoresis apparatus is connected, and then mixed powder starts to be electrophoretically deposited on the graphite; and the electrophoretic deposition time is 1-10 minutes. The revolving speed of the magnetic stirrer is 500-1200 r / min; after the electrophoretic deposition is finished, a deposited sample is taken out carefully, is dried for 1-2 h at 100-120 DEG C, and then is placed in a high-vacuum reacting furnace; the reacting furnace is heated to 1500-1600 DEG C at an inert atmosphere, and then the temperature is maintained for 1-2h; and reactive sintering is performed to obtain the composite coating. According to the preparation method, a carbide interface is formed between a substrate and diamond through metallurgical reaction, so that the bonding strength of the diamond is improved; electrophoretic deposition mixed powder particles are uniform and compact; the coating is reacted uniformly and thoroughly; the preparation cycle is short; and the cost is low.

Description

technical field [0001] The invention relates to a preparation method of a composite coating, in particular to a preparation method of a strong bond wear-resistant composite coating. Background technique [0002] Diamond has unparalleled high hardness and excellent physical and mechanical properties, making diamond tools an indispensable and effective tool for processing various hard materials. One of the main factors affecting the service life and performance of diamond tools is the adhesion of the substrate to the diamond (the ability to wrap the substrate). Due to the high interface energy between diamond and general metals and alloys, diamond particles cannot be infiltrated by general low-melting point alloys, and the adhesion is extremely poor. In traditional manufacturing techniques, diamond particles are produced only after the matrix is ​​cooled. The strong mechanical clamping force is embedded in the matrix metal matrix without forming a firm chemical bond or metall...

AI Technical Summary

Problems solved by technology

However, the preparation cycle is very long, the production cost is extremely high, and it is difficult to produce in batches; (2) high-temperature brazing method, which mainly prepares large particle size diamond composite coatings. The prepared diamond composite coatings have high bonding strength and short process cycle. However, due to the large difference in thermal expansion coefficient between metal and diamond, a large thermal stress is generated, and the molten solder metal will severely erode diamond at a temperature that can infiltrate, and induce diamond graphitization

(3) Other methods include electrophoresis-electroplating two-step deposition method and thermal spraying method, which have low production cost and can be mass-produced, but the bonding strength between diamond and substrate is low

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