A Comparison of the Microstructural Feature and Bonding Strength of Plasma-Sprayed Hydroxyapatite Coatings with Hydrothermal and Vacuum Post-Heat Treatment

• Yang Chung-Wei

  Department of Materials Science and Engineering, National Cheng Kung University

• Lee Tzer-Min

  Institute of Oral Medicine, College of Medicine, National Cheng Kung University

• Lui Truan-Sheng

  Department of Materials Science and Engineering, National Cheng Kung University

• Chang Edward

  Department of Materials Science and Engineering, National Cheng Kung University

書誌事項

タイトル別名

• Comparison of the Microstructural Feature and Bonding Strength of Plasma Sprayed Hydroxyapatite Coatings with Hydrothermal and Vacuum Post Heat Treatment

抄録

Plasma-sprayed hydroxyapatite (Ca₁₀(PO₄)₆(OH)₂, HA) is an attractive biomaterials because it can provide the osteoconductivity and osseointegration to form a chemical bonding to bone. In order to improve the properties of HA, the post-heat treatment was performed and the effect of an ambient atmosphere on phase purity, crystallinity and bonding strength of plasma-sprayed HA coatings (HACs) was investigated. On the basis of quantitative analysis in crystallinity and phase content, autoclaving hydrothermal treatment was found to be effective for the elimination of impurity phases and amorphous calcium phosphate. It should be noted that plasma-sprayed HACs with a crystallinity of 84.5% and very low impurity phase content of 1.4 mass% can be obtained through a low temperature (200°C) hydrothermal treatment. Experimental evidence confirmed that the saturated steam atmosphere plays an important role in lowering the heating temperatures and promoting HA crystallization. Furthermore, hydrothermal-treated HACs show superiority in prominent OH⁻ and PO₄³⁻ groups than vacuum heating HACs. In addition, the bonding strength of the coating layer also can be improved from 35.7 MPa (vacuum heating) to 39.4 MPa (150°C hydrothermal treatment). From the evaluation of microstructural features and properties, an excessively high heating temperature will cause contraction with HA crystallization resulting in detrimental large cracks that lead to bonding degradation. Consequently, hydrothermal treatment seems very promising as a way of improving the properties of HA coatings.

収録刊行物

• MATERIALS TRANSACTIONS

  MATERIALS TRANSACTIONS 46 (3), 709-715, 2005

  公益社団法人 日本金属学会

キーワード

• plasma spraying
• hydroxyapatite
• heat treatment
• quantitative analysis
• crystallinity
• microstructure
• bonding strength

詳細情報

• CRID: 1390001204251032320
• NII論文ID: 10015579488
• NII書誌ID: AA1151294X
• DOI: 10.2320/matertrans.46.709
• COI: 1:CAS:528:DC%2BD2MXjvFSqs7g%3D
• ISSN: 13475320
• ISSN: 13459678
• NDL書誌ID: 7290056
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I7290056
• Web Site: https://www.jstage.jst.go.jp/article/matertrans/46/3/46_3_709/_pdf
• 本文言語コード: en
• データソース種別:
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