烧成温度对可控多孔生物陶瓷制备技术的影响

Effect of sintering temperature on the controllable preparation technique of porous bioceramics

目的:观察烧成温度对多孔生物陶瓷制品孔结构、显气孔率与容重、水渗透率、收缩率以及压缩强度的影响。方法:实验于2002-09/2005-09在武汉理工大学生物中心和重庆邮电大学生物实验中心完成。采用可控多孔生物陶瓷制备技术,改变烧成温度,其他因素(如成型工艺、升温速度和保温时间等)不变,分别制得不同的样品;用电子扫描显微镜观察孔道和表面形貌;根据GB/T1964～1967-1996和GB/T1969～1970-1996测量显气孔率、容重;用自制水渗透率测定仪测定水渗透率;用体积法测定收缩率。用ASTM材料强度测试机测定压缩强度。结果:①烧成温度对孔结构的影响:在900℃以内时烧成温度的变化对大孔的影响不明显,仍然在500μm左右,但当烧成温度增加到1000℃,大孔变小到400μm左右。烧成温度的变化对小孔的影响比较明显,小孔明显增大,当烧成温度800℃增加到1000℃时,小孔从10μm左右增大到20～30μm左右。烧成温度的变化对微孔的影响也比较明显,小孔明显增大,当烧成温度800℃增加到1000℃时,小孔从4μm左右增大到6μm左右。②烧成温度对显气孔率及容重的影响:随着烧成温度的提高,样品的显气孔率下降幅度增大,容重的增加幅度增大。③烧成温度对水渗透率的影响:随着烧成温度的提高,样品的水渗透率下降幅度增大,容重的增加幅度增大。④不同烧成温度对收缩率的影响:随着烧成温度的提高,样品的收缩率增大。⑤烧成温度对压缩强度的影响:随着烧成温度的提高,压缩强度增大。而在800℃以后继续升温,压缩强度急剧增大。结论:烧成温度对孔结构、显气孔率与容重、水渗透率、收缩率以及压缩强度有着重要的影响,为了保证成品有较好的孔结构、较高的显气孔率的同时具有一定的机械强度,烧成温度选择在850℃左右较佳。

AIM： To observe the influences of sintering temperature on bore construction, apparent porosity and volume weight, the pervasion rate of water, contracted rate and compress strength of porous bioceramics. METHODS：The experiment was conducted in the Biomedical Materials and Engineering Center, Wuhan University of Technology and Biological Experimental Center, Chongqing University of Posts and Telecommunication between September 2002 and September 2005. Different samples were made by controllable preparation technique when the sintering temperature was changed and other factors such as shaping craft, temperature raise speed and incubation time; the hole path and surface were observed by scanning electron microscope; apparent pore rate and volume weight ware measured according to GB/T1964-1967-1996 and GB/T1969-1970-1996 standard, and the pervasion rate of water was tested with self-designed instrument; the contracted rate was tested by volumetric method; the compress strength was tested by ASTM strength test instrument. RESULTS： （1） Effect of sintering temperature on the bore construction： Sintering temperature below 900 ℃ had inconspicuous influence on the big bore, which remained 500 μm , but it had conspicuous influence on big bore when it was above 900 ℃, and the bore was decreased to 400 μm. The changes in sintering temperature had a great influence on eyelets, which was significantly enlarged from 10 μm to 20-30 μm when the temperature was raised from 800 ℃ to 1 000 ℃; and the microhores were increased from 4 μm to 6 μm when the temperature was raised from 800 ℃ to 1 000 ℃. （2）Influence of sintering temperature on apparent pore rate and volume weight： With the sintering temperature raised, the apparent pore rate descended, and volume weight increased significantly. （3）Influence of sintering temperature on the pervasion rate of water： The rate was reduced with the increase of temperature, and volume weight increased significantly. （4）Effect of sintering temperature on the contracted rate： The contracted rate was increased with the raise of temperature. （5）Effect of sintering temperature on the compress strength： The strength raised with temperature and sharply increased when the temperature was above 800℃. CONCLUSION：Sintering temperature has important influence on bore structure, apparent pore rate, volume weight, the pervasion rate of water, contracted rate and compress strength. To guarantee that products have better bore structure, and higher apparent pore rate and mechanical strength, the sintering temperature is better to control around 850℃.