Abstract
Improved mechanical properties have widely been
demonstrated for bulk nanocrystalline materials.
Especially with ceramic materials decreasing of grain
size has been found to be favourable. Nanocrystalline
materials offer better thermal shock resistance, lower
thermal conductivity and better wear resistance than
their conventional counterparts. For nanostrucutured bulk
composites with nanosized metal precipitations in the
nanocrystalline ceramic matrix improved fracture
toughness properties have also been reported. An
increasing effort has been made to transfer such
improvements also into thermal sprayed ceramic coatings.
Mainly work has been carried out with plasma spray
systems, but recently it has been shown that HVOF (High
Velocity Oxy-Fuel) process can produce much denser
coatings and hence better environmental protection
capacity. In this paper we describe the development of
HVOF sprayed nanocrystalline Al2O3-composite coatings,
where the grain size of Al2O3 has been decreased and a
few percents of alloying elements has been added in order
to toughen the coating.
| Original language | English |
|---|---|
| Title of host publication | Proceedings of 16th International Plansee Seminar |
| Subtitle of host publication | Powder metallurgical high performance materials |
| Place of Publication | Reutte |
| Pages | 422 - 433 |
| Volume | 1 |
| Publication status | Published - 2005 |
| MoE publication type | A4 Article in a conference publication |
| Event | 16th International Plansee Seminar - Reutte, Austria Duration: 30 May 2005 → 3 Jun 2005 |
Conference
| Conference | 16th International Plansee Seminar |
|---|---|
| Country/Territory | Austria |
| City | Reutte |
| Period | 30/05/05 → 3/06/05 |
Keywords
- thermal spraying
- HVOF
- process optimization
- alumina
- coatings
- ceramic coatings
- nanostructures