Synthesis of HAP coating on galvanostatically treated stainless steel substrates by sol–gel method

• Published in: Journal of sol-gel science and technology Vol. 51; no. 2; pp. 190 - 197
• Main Authors: Ak Azem, F., Cakir, A.
• Format: Journal Article
• Language: English
• Published: Boston Springer US 01.08.2009; Springer; Springer Nature B.V
• Subjects: Adhesion; Aging (natural); Austenitic stainless steels; Biological materials; Calcium compounds; Calcium phosphates; Ceramics; Chemistry; Chemistry and Materials Science; Coatings; Colloidal gels. Colloidal sols; Colloidal state and disperse state; Composites; Exact sciences and technology; General and physical chemistry; Glass; Hydroxyapatite; Inorganic Chemistry; Materials Science; Morphology; Nanotechnology; Natural Materials; Optical and Electronic Materials; Original Paper; Scanning electron microscopy; Sol-gel processes; Stainless steel; Substrates; Surgical implants; Adhesion; Hydroxyapatite, calcium-phosphate coating; Stainless steel; Sol–gel technique; Scanning electron microscopy; Phase composition; Calcium phosphate; Hydroxyapatite; X ray diffraction; Substrate; Sol-gel technique; Synthesis; Sol gel process; Calcium compound; Preparation; Affinity; Structure
• ISSN: 0928-0707; 1573-4846
• DOI: 10.1007/s10971-009-1964-8

Producing bioactive hydroxyapatite coatings on metallic implant materials combines the mechanical advantages of implant materials and biological affinity of the hydroxyapatite surface to the natural tissue. In this work, hydroxyapatite was synthesized on 316L stainless steel substrates via sol–gel method by using Ca(NO 3 ) 2 ·4H 2 O and C 6 H 15 O 3 P. In order to improve adherence of the coatings produced, the surface of the substrate was initially modified by electrodepositing nucleus of calcium phosphate compounds. Effect of aging time for preparation of the sol solution and coating characteristics were investigated. The phase compositions and structures of the coatings were characterized by X-ray diffractometry, and scanning electron microscopy was used to determine morphological characteristics of the coatings. Adhesion between the hydroxyapatite coating and the substrate was investigated by using scanning scratch tester. The coating produced on the modified surface by the sol solution aged for 24 h was found to prove better morphological and adhesion properties.