Influences of Heating Condition and Substrate-Surface Roughness on the Characteristics of Sol-Gel-Derived Hydroxyapatite Coatings
- Cite this article as:
- You, C., Oh, S. & Kim, S. Journal of Sol-Gel Science and Technology (2001) 21: 49. doi:10.1023/A:1011253431489
A prepared transparent HA solution was coated on Ti6Al4V substrates by a spin-coating technique. The crystallization of the sol-gel-derived HA coated on the metallic substrates could be done at relatively low firing temperatures (as low as 600°C). The characteristics of the HA-coated layer were dependent on the surface roughness of substrates and heating conditions such as firing temperature, holding time, heating rate, and atmosphere. The heat treatment at a slow heating rate (<2°C/min.) and a long heating time (>10 hrs) at 600°C in air produced the uniform surface and improved the crystallinity. The HA layer coated on 20 μm grit-blasted substates was more uniform and had fever cracks after firing, compared with that coated on 100 μm grit-blasted rougher substrates.