What is the hardness of tungsten carbide sprayed on the vibrating screen frame
Information summary：The hardness of the vibrating screen frame after spraying tungsten carbide is very high, usually reaching HV 1000-1400 (Vickers hardness). The specific value may vary slightly due to factors such as spraying process, tungsten carbide powder particle size, and coating density. Its hardness characteristics can be further explained from the following aspects:
The hardness of the vibrating screen frame after spraying tungsten carbide is very high, usually reaching HV 1000-1400 (Vickers hardness). The specific value may vary slightly due to factors such as spraying process, tungsten carbide powder particle size, and coating density. Its hardness characteristics can be further explained from the following aspects:
1. Industry comparison of hardness levels
Far higher than ordinary metal materials: for example, the hardness of ordinary carbon steel is about HV 100-300, stainless steel is about HV 200-400, and the hardness of tungsten carbide coating is 3-7 times that of it.
Approaching high hardness tool steel: The hardness of high-speed steel is about HV 800-1000, and the hardness of tungsten carbide coating is comparable or even higher, similar to some ceramic materials (such as alumina ceramics with HV 1500-2000).
2. The correlation between hardness and wear resistance
Tungsten carbide (WC) itself is a superhard ceramic material, and the high hardness of its coating directly corresponds to excellent wear resistance. The vibrating screen frame is subjected to continuous impact, friction, and grinding on the surface when screening materials such as ore, sand, and chemical raw materials. The high hardness tungsten carbide coating can effectively resist these wear and tear, greatly extending the service life of the screen frame (usually by 3-10 times).
3. Key factors affecting hardness
Spraying process: When using supersonic flame spraying (HVOF) or plasma spraying, the coating has high density, low porosity, and usually higher hardness (up to HV 1200-1400); Ordinary flame spraying may have slightly lower hardness (HV 1000-1200) due to the loose coating.
Powder particle size: After spraying fine-grained tungsten carbide powder (such as 10-45 μ m), the coating structure is more uniform and the hardness is slightly higher than that of coarse-grained powder.
Bonding phase ratio: Tungsten carbide coatings usually contain a small amount of metal bonding phases (such as Co, Ni). Increasing the content of bonding phases (such as from 6% to 12%) will slightly reduce hardness, but can improve coating toughness, requiring a balance between hardness and impact resistance.
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