Calcium phosphate coating on titanium substrate by electrodeposition

• Main Authors: Chen, Jim-Shone, 陳俊雄
• Other Authors: Min-Hsiung Hon
• Format: Others
• Language: zh-TW
• Published: 1996
• Online Access: http://ndltd.ncl.edu.tw/handle/18857653734114499372

碩士 === 國立成功大學 === 材料科學(工程)學系 === 84 === AbstractThe calcium phosphate was deposited on titanium substrate by using electrolytic mixture of Ca(NO3)2（0.042M） and NH4H2PO4（0.025M） solutions with DC power supply. The cathode and anode were titanium substrate and platinum respectively. Various ratios of alcohol were added to increase the resistance of electrolyte and improve the quality of calcium phosphate coating.The result shows that the most uniform coating is obtained by adding 50％ ethylene alcohol in the solution and the power voltage and temperature of electrolyte are maintained at 20V and 40℃ respectively. Thick layer of 800um can be obtained for 3 hours deposition.The adhesion of calcium phosphate coating on the titanium substrate can be improved by post-treating in the electrolyte of similar composition without ethylene alcohol addition. The 3MPa adhesive strength is achieved for 120 hours post-treatment. The improvement of adhesion for calcium phosphate coating on titanium is performed by densifying the film from the outside surface to the interface of the coating.The calcium hydroxide appearing in the coatings can be dissolved in boiling water for 4 hours. The micrographs of the boiled sample indicated uniform distribution of calcium hydroxide in the coating.