2002 Fiscal Year Final Research Report Summary
Development of Bio-implant materials by Plasma-Spray Coating of Apatite and Their Evaluation
| Project/Area Number |
12555203
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 展開研究 |
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| Research Field |
Material processing/treatments
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| Research Institution | Oyama National College of Technology |
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Principal Investigator |
OKUYAMA Masaru Oyama National College of Technology Dept. Materials Chemistry and Bioengineering Prof. Dr., 物質工学科, 教授 (50042528)
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| Project Period (FY) |
2000 – 2002
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| Keywords | implant material / plasma spray / apatite coating / Thermal-diffusion treatment / チタン |
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| Research Abstract |
In order to fabricate substitute artificial bone materials, the author tried plasma-coating of hydroapatite layer on metallic materials. However, the plasma-sprayed layers are so porous that body liquid penetrates to the substrates and attacks them. Moreover, because of extremely high temperature of ca.2,000℃, hydroapatite layer may easily decomposes and lose contact to the substrates. The author solved these problems and developed the plasma-sprayed hydroapatite coating materials. (1)The reaction of H3PO4 and Ca(OH)2 could not give hydroapatile but aging and heat-treatment promoted change into hydroapatite. (2)Plasma-spraying of, hydroapatite formed the coating layer without hydroapatite. However, controlling of the powder radius improved formation of hydroapatite. (3)Plasma-sprayed hydroapatite was amorphous, but crystallized by 3 hour and 800℃ heat-treatment. (4)Corrosion test of the hydroapatite-coated pure titanium, commercial Ti rod and SUS316 stainless steel was performed in 3.5%NaCl solution. Only the pure titanium was improved by hydroapatite coating. This is probably because joint between the hydroapatite layer and the substrate was tight. It was also found that the heat diffusion treatment improved their jointing.
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