超音波噴霧熱分解法によるストロンチウムアパタイト粉体のキャラクタリゼーション

概要

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Strontitlmapatite(Sr_<10>(PO_4)_6(OH)_2 ; SrAp)powder was prepared by the ultrasonic spray-pyrolysis technique and was characterized. Three kinds of Starting soltltions with a Sr/P molar ratio of 1.67 were prepared by mixing Sr(NO_3)_2, (NH_4)_2HPO_4 and HNO_3 ; the concentrations of Sr^<2+> and PO_4^<3-> were in the ranges of 0.10 to 0.50 mol・dm^<-3> and 0.06 to 0.30 mol・dm^<-3> respectively. These solutions were sprayed into the heating zone to prepare the SrAp powders. The heating zone was composed of two electric furnaces ; the lower furnace served for the evaporation of the solvent from the droplets(400°C), the upper furnace for the pyrolysis of the precipitated metal salts(850°C). Easily sinterable SrAp powder was prepared by spray-pyrolysis from a starting solution containing 0.10 mol・dm^<-3> of Sr^<2+> and 0.06 mol・ dm^<-3> of PO_4^<3->. The resulting powder was conposed of spherical and solid particles filled with fine primary particles. This SrAp powder was thermally stable up to 1200°C. Even without calcination and grinding operations, the relative densities of the compacts fired at 1200°C for 5 h attained maxima of 〜96%. The microstructtlre of the sintered conpacts appeared to be uniform ; the average grain size was 〜2 μm.
社団法人日本セラミックス協会の論文
1999-11-01