Spray tungsten carbide coating hardness number can be processed

       Can the sprayed tungsten carbide coating be processed?

The theory can be 65~70HRC, which is the theoretical hardness achieved by domestic spraying technology.

Spraying tungsten carbide coating on the sealing surface will also increase the difficulty of grinding and other processes. It is recommended to use emery paste for grinding.

Figure (1) Using supersonic speed JP8000 spraying tungsten carbide coating



Take the spraying of tungsten carbide on the tower wheel as an example. The application of tower wheels in industrial equipment is very important. Like other products, there are many types of tower wheels. The tower wheels are made of steel and the surface is sprayed with ceramics and tungsten carbide. The product can achieve wear resistance, increased hardness, and service life 5 to 10 times higher than ordinary tower wheels.

The supersonic flame spraying process is used to spray tungsten carbide coating on the surface of the wire drawing machine tower wheel, guide wheel, wire drawing cylinder, take-up reel, guide groove and other parts, which can make the surface hardness reach HRc75, which is far more than that of abrasive steel or chilled cast iron. High wear resistance; use tungsten carbide spraying, and the base body can be ordinary 45# steel or cast iron, which can reduce material costs and extend service life.

Figure (2) Special equipment for testing the hardness of tungsten carbide coating. The testing hardness is Vickers hardness. The hardness of Beijing Nimo Co., Ltd. is generally about HV1300.



Performance parameters:

1. Hardness: HRC65~HRC75

2. Coating bonding strength: greater than or equal to 60MPa

3. Coating thickness: 0.2～0.3mm

4. Surface finish Ra0.1

5. Service life: 5-10 times longer than ordinary tower wheels

Figure (3) Tungsten carbide coating seal ring is sprayed with tungsten carbide coating and then ground into a mirror surface to achieve the sealing effect