수열합성법에 의한 calcium phosphates 분말합성
Preparation of calcium phosphates by hydrothermal synthesis route
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초록
인산칼슘(hydroxyapatite(HAp), β-tricalcium phosphate(β-TCP) 및 HAp와 β-TCP가 혼합된 2상 인산칼슘(BCP, HA/ β-TCP))들을 수열합성법을 통해 합성하였다. 여러 수열합성 조건(최고온도 150°C 및 pH 12 이하)에서 수산화칼슘(Ca(OH)2) 수용액과 인산(H3PO4) 용액을 반응시켜 얻은 침전물을 수열합성에 이용하였다. 초기 전구체 Ca/P 비율을 1.30, 1.50 및 1.67 로 조절하였으며 이 조성비와 합성 후 열처리가 분말 및 소결체의 상합성에 미치는 영향에 대해 조사하였다. 초기 전구체Ca/P 비율을 조절함으로써 분말 및 소결체의 상의 조절이 가능하였다. Ca/P 비율이 1.67일 경우 모든 열처리 온도에서 분말 및 소결체 모두에서 HAp 단일 상이 합성되었다. Ca/P 비율이 1.30과 1.50에서 900°C 이상 열처리 할 경우 각각 순수한β-TCP와 BCP(HAp/β-TCP)가 합성되었다. 반응성 높은 미세한 분말을 이용하여 소결함으로써 미세한 입경을 가지며 투광성을 가지는 소결체들을 저온에서 얻을 수 있었다.
Abstract
Calcium phosphates such as hydroxyapatite (HAp), tricalcium phosphate (β-TCP), and biphasic calcium phosphate (BCP, HAp/β-TCP) have been prepared via hydrothermal treatment. The synthesis was conducted by reacting (Ca(OH)2) aqueous solution with phosphoric acid (H3PO4) under different hydrothermal synthesis conditions (temperatures up to 150°C and pH lower than 12). The effects of initial precursor Ca/P ratio (1.30, 1.50 and 1.67) and post heat treatment on the phase evolution behavior of the powders and sintered ceramics were investigated. The phases of resulting powders and sintered ceramics were controllable by adjusting the initial Ca/P ratio. A single HAp phase without any noticeable second phase was obtained for the initial Ca/P ratio of 1.67 in the overall heat treatment range. Pure β-TCP and biphasic calcium phosphate (HAp/β-TCP) were synthesized from precursor solutions having Ca/P molar ratios of 1.30 and 1.50, respectively, after having been heat treated at 900°C or higher. Dense ceramics with translucency were obtained at considerably lower sintering temperatures
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