Comparison of the characteristics of HVOF and plasma thermal spray
- Idaho National Engineering Lab., Idaho Falls, ID (United States)
In spraying oxygen sensitive materials, such as WC:Co it is often observed that the carbide fraction present in the deposit is significantly less than in the original particles. This lowers the hardness of the coating, resulting in inferior wear resistance. The cause is the in-flight, high temperature decomposition of carbides by reaction with entrained oxygen. The degree of decomposition is determined by a combination of particle temperature, residence time and entrainment characteristics of the jet. The fundamental differences between HVOF and plasma thermal spray are examined in this context. Even though the HVOF process may actually subject a particle to greater oxygen exposure than plasma spraying, the lower particle temperatures experienced lead to coatings which exhibit less carbide loss than plasma sprayed coatings fabricated in air.
- DOE Contract Number:
- AC07-76ID01570
- OSTI ID:
- 160466
- Report Number(s):
- CONF-940684--; ISBN 0-87170-509-5
- Country of Publication:
- United States
- Language:
- English
Similar Records
HVOF particle flow field characteristics
The HVOF process - the hottest topic in the thermal spray industry