Abstrakti
HVOF-sprayed ceramic coatings can be considered as potential candidates for applications where good chemical and corrosion resistance of ceramics is needed. Due to the less porous structure of the HVOF-sprayed coating as compared to the plasma sprayed one, the protection capability of the coating is increased. Despite the dense structure, the coating properties are inferior as compared to bulk ceramics because of pores and microcracks, which influence adversely the coating properties (i.e., toughness, hardness and wear resistance). Improved mechanical properties have widely been demonstrated for bulk nanocrystalline materials. Especially with ceramic materials the decreasing of grain size has been found to be favorable.
Dense nanostructured ceramic coatings containing various nanostructured particles were manufactured by HVOF-spraying by using an HV-2000 spray gun. Mechanical properties, especially elastic modulus and relative fracture toughness, were studied. The techniques used were instrumented nanoindentation and KIC evaluation. As a result coatings with nearly 100% improvements in relative fracture toughness were produced for nanoreinforced composite coating.
| Alkuperäiskieli | Englanti |
|---|---|
| Otsikko | Applied Material Research at VTT |
| Toimittajat | AC Ritschoff, J Koskinen, M Paajanen |
| Kustantaja | Technical Research Centre of Finland |
| Sivut | 188-199 |
| Sivumäärä | 12 |
| ISBN (painettu) | 978-951-38-6311-1 |
| Tila | Julkaistu - 2006 |
| Julkaistu ulkoisesti | Kyllä |
| OKM-julkaisutyyppi | A4 Artikkeli konferenssijulkaisussa |
| Tapahtuma | Internal Symposium on Applied Materials - Espoo, Suomi Kesto: 8 kesäk. 2006 → … |
Julkaisusarja
| Nimi | VTT SYMPOSIA |
|---|---|
| Kustantaja | TECHNICAL RESEARCH CENTRE FINLAND |
| ISSN (painettu) | 0357-9387 |
Conference
| Conference | Internal Symposium on Applied Materials |
|---|---|
| Maa/Alue | Suomi |
| Ajanjakso | 8/06/06 → … |