纳米羟基磷灰石粉体的制备和低温烧结

对沉淀法制备纳米HAp粉体及低温烧结HAp材料进行了研究. 结果表明：陈化对于防止HAp在高温下分解有重要作用；在陈化前加入一定量的聚乙二醇，可以明显增大纳米HAp粉体的比表面积，降低烧结温度；在普通无压烧结条件下，可在950℃的低温下，获得相对密度达98%左右的HAp材料，致密化温度比商业用粉低数百度. 研究还表明：醇洗不能有效提高纳米HAp的烧结性能.

Synthesis and Low-temperature Sintering of Nano-sized HAp Powders

Nano-sized HAp powders with small grain size and large surface area were prepared by the precipitation method. Their sintering behavior was also investigated. Aging was critical to ensure that reagents are fully reacted. The results show that the surface area of the nano-sized HAp powder could be largely increased by adding 3% (w) PEG before aging. The sintering ability of the as-prepared nano-sized HAp powder was so good that a high relative density of 98% could be obtained at 950oC, which is about several hundred degrees lower than that of commercial HAp powders. The sintering ability of the nano-sized HAp powders washed by water is better than that washed by ethanol, which is different with that in the case of other powders.