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상온 분사법에 의한 수산화아파타이트 코팅 지르코니아의 제조 및미세구조에 미치는 열처리 효과
이종국 ( Jong Kook Lee ),음상철 ( Sang Cheol Eum ),김재홍 ( Jae Hong Kim ),장우양 ( Woo Yang Jang ) 한국열처리공학회 2015 熱處理工學會誌 Vol.28 No.1
Hydroxyapatite coatings were fabricated by a room temperature spray method on zirconia substrates and the influence of heat-treatment on their microstructure was also investigated. Phase composition of coated hydroxyapatite films was similar to the starting powder, but the grain size of hydroxyapatite particles was reduced to the size of nano-scale about 100 nm. Grain size, particle compactness, and adhesiveness to zirconia of hydroxyapatite coatings were increased with heat-treatment temperature, but some of cracks by heat-treatment above 1100℃ were initiated between hydroxyapatite coatings and zirconia substrate. Heat-treated hydroxyapatitelayers show the dissolution in SBF solution for 5 days. Hydroxyapatite-coated specimen heat-treated at 1100℃ for 1 h has a good biocompatibility, which specimen induced the nanocrystalline hydroxyapatite precipitateson the coating surface by the immersion in SBF solution for 5 days. (Received December 26, 2014; Revised December 31,2014: Accepted JANUARY 6, 2015)
소뼈를 원료로 하여 스폰지법으로 제작한 다공성 하이드록시아파타이트 생체 세라믹스
이종국 ( Jong Kook Lee ),음상철 ( Sang Cheol Eum ),최세원 ( Se Won Choi ) 조선대학교 공학기술연구원 2016 공학기술논문지 Vol.9 No.4
Natural hydroxyapatite powder was obtained from the calcination of bovine bones and porous hydroxyapatite bioceramics were fabricated by a polymeric sponge method and pressureless sintering. Slurry for sponge filling was prepared by the mixing of hydroxyapatite powder (47.4wt%), distilled water(49.5wt%), Davan C as a dispersant and PVA 1500 as a binder (0.6 wrt%). Melanin sponge was selected as a porous scaffold, which had large pore size of 50∼200 μm and the porosity about 94%. Sponge filling into pores by slurry was performed by a dipping method. After sintering at 1250 °C for 2 hours, porous hydroxyapatite could be obtained by the burning out of sponge polymer and the forming of new bonding between particles. Porous hydroxyapatite compact was composed of sphere particles 1∼2 μm and had the sintered density of 26% and the porosity of 74%. Two kinds of pores were observed in porous hydroxyapatite compact. Large pores about 100∼500μm had a spherical shape and dispersed with irregular distribution. On the contrary, small pores with 2∼3 μm between particles were homogeneously existed on all of regions.