[Thermal spray powder subject] application of Thermal spray powder in water turbine in hydroelectric industry

Thermal spraying technology is a mature surface strengthening and protection technology and an important part of surface modification. With the development of science and technology, thermal spraying technology to improve the abrasion, corrosion, cavitation resistance of turbine blade in hydropower industry has obtained the good effect and popularization. For the operation condition of the existence both sediment erosion and erosion, surface strengthening is one of the best method to achieve high wear-resisting, anti-corrosion, cavitation resistance, and reduce the coating service costs.

01-The thermal spray powder sprayed on the turbine are mainly WC/10Co/4Cr series

uniform composition, concentrated particle size distribution, stable apparent density, and good morphology. Forming a tungsten carbide powder on the surface of the blade, greatly improving the life of the turbine, make sure the work efficiency and maintain the output thermal spray power of turbine.

02- Performance of the coating

Metallographic structure of the thermal spray materials

Densified thermal spray coating, good combination interface with matrix, no oxide inclusions, uniform distribution of WC hard phase.

Porosity<0.5%

Bonding strength>70 MPa

Hardness: HV0.3 1100-1350

Corrosion resistance: standard salty test, no corrosion after 240H

Working temperature <=500℃

Details of the tungste carbide powder