Challenges in Thermal Spray to Design Engineering Coatings and Associated Environmental Concerns
摘要
This review presents some aspects of the role of thermal spraying as environmentally friendly solutions offering increased efficiency to components in different industrial fields. The relations between environment and spraying processes and the general characteristics of thermal spray techniques will be introduced. The ecological challenges and sustainability offered by cutting edge technologies such as High Velocity Oxygen Fuel (HVOF) process, Atmospheric Plasma Spraying (APS) and Cold Spray will be examined. HVOF sprayed new feedstock powders used as alternatives to hazardous metals for engineering applications. HVOF cermet coatings based on carbide ceramics proved efficiency in reducing wear of brake discs in the automotive field, hence, overcoming ecological problems due to gas emissions and mechanical vulnerability after long use. Increased efficiency in thermal barrier coatings is now gained by APS materials allowing lower fuel consumption and gas emissions. Otherwise, cold spray is a clean technology where coatings are formed under low temperatures and high impact velocities. This technique helps to bring harmony joining environmental concerns and industrial applications including heavily loaded engine parts, piston rings, etc.