脱水非晶質リン酸カルシウムからのβ-Ca3(PO4)2焼結体の調製
1987 年 95 巻 1104 号 p. 770-774
詳細
1987 年 95 巻 1104 号 p. 770-774
Amorphous calcium phosphate, after thermally dehydrated, was used as a starting material for preparation of sintered β-Ca3(PO4)2. Specific surface area and pore size distribution of the dehydrated powders were examined from the adsorption isotherms in order to clarify the relation between the powder properties of dehydrated samples and the sintering process. Sintered β-Ca3(PO4)2 with more than 90% of theoretical density was prepared from crystalline α-tricalcium phosphate which was obtained at 700°C, while dense bodies were formed by hot pressing at 24MPa and 1100°C for 30min from the starting powders calcined at low temperature. The hindrance of densification by mesopores (20-200Å) in the dehydrated powder particles might be eliminated by the thermal crystallization and the hot pressing.
