Abstract
In clinical applications, the mechanical failure of HA-coated titanum alloy implants suffered at the interface of the HA coating and titanum alloy substrate will be a potential weakness in prosthesis. Yttria stabilized zirconia (YSZ) reinforced HA coatings have been proven to enhance the mechanical properties of the HA coating significantly and reduced the formation of calcium oxide (CaO). In this paper, HA/YSZ (30 wt. % YSZ) composite coatings were sprayed by the plasma technique. The effects of the powder processing-mechanical ball milling method and spheroidization method on the microstructure and mechanical properties of the HA/YSZ composite coatings were evaluated. The experimental results showed that the spheroidized powders melted better than the ball milled powders during plasma spraying and formed higher mechanical property coatings (1.6326±0.08 MPa m-0.5 of fracture toughness, 58.59±2.91 GPa of elastic modulus and 43.42±2.53 MPa of tensile bond strength). HA/YSZ solid solution formed during deposition on the substrate, which played a very important role in the mechanical properties of the HA/YSZ composite coatings. Tensile bond strength tests showed that the fracture mode was cohesive and that failure occurred at the interface of HA and unmelted YSZ particles. The molten stat of YSZ had a great influence on the properties of the HA/YSZ composite coatings.
| Original language | English |
|---|---|
| Pages (from-to) | 263-268 |
| Number of pages | 6 |
| Journal | Surface and Coatings Technology |
| Volume | 140 |
| Issue number | 3 |
| DOIs | |
| Publication status | Published - May 31 2001 |
| Externally published | Yes |
ASJC Scopus Subject Areas
- General Chemistry
- Condensed Matter Physics
- Surfaces and Interfaces
- Surfaces, Coatings and Films
- Materials Chemistry
Keywords
- Hydroxyapatite
- Mechanical property
- Plasma spraying
- Yttria zirconia