【摘要】 本文主要对微孔型HAp基生物材料的制备工艺及成孔机制进行了初步研究。研究发现 ,经冷压成型、等静压成型后的坯体再用无压烧结可制得孔径不等的微孔型HAp ZrO2 复合材料。在成型压力、烧结温度及保温时间都相同的条件下 ,添加剂与纳米氧化锆含量越高复合材料的强度越低 ,但其最低弯曲强度也达到 2 3MPa,大大高于已报道的多孔型材料。添加剂及纳米ZrO2 的加入量是材料中孔径大小及孔隙率高低的关键因素 ,而成型方式、烧结温度及保温时间等因素对其也有影响。更多还原

【Abstract】 In this paper, the authors studied the preparation and the mechanism of producing pores on tiny porous HAp based biomaterial.At first, the multiplex powder was moulded by cold pressing and isostatic pressing; then, the samples were sintered at 1200℃ for about 3h in air and the tiny porous HAp-ZrO₂ composites with different pores were obtained. When the moulding pressure, sintering temperature and keeping temperature time are all the same, the flexural strength of the composite is becoming lower with the increase of additive and nano-zirconia contents. But the lowest value of flexural strength is still about 23MPa which is much higher than that of the porous hydroxyapatite in literatures. The added quantity of additive and nano-zirconia is the key factor which influences the diameter and ratio of pores in the composite. Other factors, such as moulding mode, sintering temperature and the time of keeping temperature, can influence them too.更多还原