放电等离子烧结制备纳米羟基磷灰石-氧化锆复合陶瓷

Nano-Hydroxyapatite-Zirconia Ceramics Sintered by Spark Plasma Sintering

目的制备保持羟基磷灰石生物活性的新型纳米羟基磷灰石-氧化锆复合陶瓷。方法湿球磨法制备羟基磷灰石与氧化锆复合粉体,复合陶瓷素坯制作后,放电等离子烧结制备新型纳米羟基磷灰石-氧化锆复合陶瓷,X射线衍射分析及扫描电子显微镜观察复合陶瓷的晶相与超微结构。结果复合陶瓷经X射线衍射分析显示其中有羟基磷灰石相和四方相氧化锆,未发现其他物质以及其他相的氧化锆。扫描电镜下氧化锆相呈白色,羟基磷灰石相呈黑色;黑白区域间隔存在,呈现均匀散在分布,白色区域略多于黑色区域,未见明显孔隙存在。结论用放电等离子法制备得到的复合陶瓷均匀、致密,无明显气孔存在,无羟基磷灰石或氧化锆单一组分的团聚,提示两组分在烧结过程中未发生反应。

Objective To obtain nano-hydroxyapatite （HAp）-zirconia （ZrO2 ） ceramics with bioactive HAp. Methods HAp and ZrO2 powder were mixed and ball-milled in ethyl alcohol with ZrO2 balls as media. Nano-HAp-ZrO2 ceramics were obtained with a novel consolidation technique, spark plasma sintering （SPS）. After sintering the scanning electron microscope and X-ray diffraction inspection were employed on nano-HAp-ZrO2cer-amics. Results The HAp-ZrO2ceramics did not contain any phases other than HAp and the tetragonal modification of ZrO2. They were white in ZrO2 phase and black in HAp phase under the scanning electron microscope, and were fully densified thus free of pores. Conclusion There are no reactions between HAp and ZrO2 during the sintering procedure. The HAp-ZrO2 ceramics sintered by SPS are quite different from the traditional ceramics.