In situ synthesis of osteoconductive biphasic ceramic coatings on Ti6Al4V substrate by laser-microwave hybridization

Man Tik Choy, Ka Wai Yeung, Ling Chen, Chak Yin Tang, Chi Pong Tsui, Wing Cheung Law

Research output: Journal article publicationJournal articleAcademic researchpeer-review

10 Citations (Scopus)


In this study, a new laser-microwave hybridization method, which comprises laser micropatterning, microwave heating and in situ synthesis has been developed to produce titania/hydroxyapatite/tricalcium phosphate (TiO2/HA/TCP) composite coating on titanium alloy (Ti6Al4V) substrate. The composite coating with a fine porous network microarchitecture was selectively produced on the Ti6Al4V surface by laser ablation and alkaline treatment. Using TiO2sol-gel and mixed powders of calcium carbonate (CaCO3) and dicalcium phosphate dihydrate (CaHPO4·2H2O), the composite coating synthesized at a temperature of 800 °C in a short time of 20 min exhibited homogeneous microstructure, strong hydrophilicity and good adhesion strength of 34 MPa. The in vitro apatite-forming capability of the coating was examined by immersing the coated Ti6Al4V specimen into a simulated body fluid (SBF) for up to 7 days. Biodissolution was observed in the early stage of incubation, followed by apatite precipitation. The quantity and size of the apatite globules increased over time. After 7 days of immersion, the coating surface was nearly covered by a layer of bone-like apatite, showing a significant improvement of its osteoconductive property over the uncoated sample. The laser-microwave hybridization provides an efficient route to synthesize HA/TCP based coatings for bioactivity enhancement, and serves as an effective sterilization tool for implant materials.
Original languageEnglish
Pages (from-to)92-101
Number of pages10
JournalSurface and Coatings Technology
Publication statusPublished - 1 Dec 2017


  • Bone-like apatite
  • Calcium phosphate
  • In situ synthesis
  • Microwave heating
  • Microwave sterilization
  • Surface modification

ASJC Scopus subject areas

  • General Chemistry
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Materials Chemistry


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