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Method For Improving The Bonding Force Between Diamond And Carcass In Diamond Tools
Jan 30, 2019

Diamond is widely used in the preparation of diamond tools because of its excellent physical and chemical properties such as high hardness, high strength, and high wear resistance. However, the problems of insufficient holding power, particle shedding, oxidation, and graphitization in the diamond tool seriously affect the service life and efficiency of the tool. Two major methods to improve the bonding force between diamond and base in diamond tools: surface metallization and surface roughening method to improve the mechanical insertion force of diamond and carcass ; use of vapor deposition, electroless plating and post-heat treatment, salt bath to make diamond Forms a chemical bond with the metal. By implementing the above method, the problem of the bonding force of the particles in the diamond tool can be effectively solved.

1.  Improve mechanical setting force

The surface treatment of the diamond is carried out by surface metallization and surface roughening, so that the diamond can be well infiltrated and embedded by the carcass metal, thereby enhancing the bond between the carcass and the diamond particles in the diamond tool.

1)

Surface metallization

After the surface of the diamond is metallized, the surface of the diamond has metallic properties. The surface layer not only fills the micropores and cracks of the diamond itself, but also promotes the wetting ability between the diamond and the carcass metal, and can improve the tight bonding between the diamond particles and the metal.

2) Surface roughening

The roughening method is used to form some tiny pits and cracks on the diamond surface, which increases the surface roughness of the diamond to improve the mechanical integration force of the diamond and the metal and enhance the "mechanical anchor chain" effect. There are two other functions to increase the roughness of the diamond surface: First, the roughened diamond surface forms some tiny concave surfaces. Because of the large adsorption force on the diamond surface, it is beneficial to the adsorption of metal ions in the surface. Subsequent electroless plating and electroplating; the second is to connect some of the original concave surface and dislocation on the diamond surface, forming a step on the diamond surface, which provides favorable conditions for the growth of electroless plating or electroplated metal deposition layer.

2. Improve chemical bonding force

By treating the diamond at a high temperature, the carbon atoms on the surface form a metal/carbon chemical bond with the metal atom, thereby exerting a strong bond between the diamond particles and the tool carcass metal through the bridge function of the bond.

1) Vapor deposition method.

The vapor deposition method is divided into physical vapor deposition and chemical vapor deposition according to the action mechanism. Under vacuum, the metal is vaporized into atoms, molecules or ions and deposited directly onto the surface of the plated part, called vacuum physical vapor deposition (PVD). Depending on the gasification method of the film-forming material, the PVD method can be further divided into vacuum evaporation plating, vacuum micro-evaporation plating, vacuum sputtering plating, and vacuum ion plating. Chemical vapor deposition (CVD) is a method in which a gaseous compound (such as a halide) is introduced into a reaction chamber in which a plated member is placed under a certain pressure, temperature, and time under a certain pressure, temperature, and time, and is thermally decomposed or chemically contacted with the workpiece. Synthesize to form a plating layer.

2) Heat treatment after chemical coating

The surface of the diamond is plated with a metal which is chemically bonded to carbon by the electroless plating method mentioned above, and then the plated diamond is placed in a vacuum furnace for heat treatment to form a desired carbide on the surface of the diamond, thereby making it easy to form Infiltrated by ordinary metals.

3) Salt bath method.

At high temperature, the diamond-active metal or alloy is heated to melt into the diamond surface, and penetrates into the micropores and cracks under the action of capillary force to form a layer of metal or alloy on the diamond surface. Compound film.