【作者】 崔晓军；

【导师】 马卫兵； 徐跃华；

【作者基本信息】 天津大学 ， 材料工程， 2008， 硕士

【摘要】 作为新型的高温隔热节能材料,环保型可降解陶瓷纤维已经在某些领域完全替代了传统的硅酸铝纤维。研究开发环保型可降解耐火纤维有利于改善人类的生活环境,也能够使人们免受非降解纤维的危害。本文采用硅灰石、镁砂和石英砂等原料,通过电阻炉熔融喷吹法制备了具备降解性能的可降解耐火纤维,并探讨了不同的添加剂对可降解纤维熔体性能和降解性能的影响。在CaO-MgO-SiO₂系中,通过加入不同的添加剂,研究了可溶性陶瓷纤维在模拟肺液中的溶解性能以及纤维在溶解前后的SEM检测,探讨了可降解陶瓷纤维的降解机理:一方面生物可溶性陶瓷纤维从表面开始溶解,膨胀,使结构疏松,表面积迅速扩大,纤维被分散;另一方面,纤维中的非晶态二氧化硅与水作用,不断地溶解,可溶性纤维中的硅酸镁、硅酸钙消耗了水中的氢离子,使模拟肺液的pH值增加,pH值增加的模拟溶液进一步地侵蚀纤维。在CaO-MgO-SiO₂系中,随着ZrO₂含量的增加,可溶性陶瓷纤维的降解性能下降;随着Al₂O₃含量的增加,可溶性纤维的降解性能也下降。在CaO-MgO-SiO₂系中,通过在配方中引入不同添加剂,并测定高温熔体的粘度,绘制了粘度变化曲线,研究了不同添加剂对高温熔体粘度的影响。结果表明:生物可溶性陶瓷纤维高温熔体粘度随着温度的升高粘度降低;在同一温度下,随着配方中ZrO₂含量增加纤维的熔体粘度增加。在高温区相同温度下,随着配方中Al₂O₃含量增加纤维的熔体粘度下降;在熔体低温区时,随着Al₂O₃含量增加可溶性陶瓷纤维高温熔体粘度下降,但变化不大。更多还原

【Abstract】 As the energy-saving high-temperature furnace insulation materials, environment-friendly biodegradable refractory fibers can be entirely replace the traditional Aluminum silicate refractory fibers in some areas. Therefore research and development of environment-friendly biodegradable refractory fiber will help to improve the living environment of mankind, and enable people from the harm of non-degradable fibers.In this paper, the Environment-friendly biodegradable refractory fibers were prepared by melting the raw materials of wollastonite, magnesia, quartz sand and others. Meanwhile, The effects of a variety of additives on the performance of biodegradable fibers melt and degradation were studied.The solubility of refractory fiber in a simulated lung fluid were studied by adding different additives and the SEM analysis were done to the before and after dissolution. The degradation of the refractory fiber were discussed also. While the refractory fibers began dissolving, swelling from the surface, the structure become loose and the area of the fiber rapid expanded and spread., the fiber were dissolved because of the reaction between the amorphous silica and water. The magnesium silicate, calcium silicate in soluble fiber consumed the hydrogen ions in the water, what made the simulated lung fluid pH value to increase, and the solution with higher pH value would erode the fiber badly.In CaO-MgO-SiO₂ system, with the content of ZrO₂ increasing, the degradation of the soluble refractory fiber decline, as while as adding Al₂O₃.The viscosity curve about the CaO-MgO-SiO₂ systems had been drawn after adding different additives and testing the viscosity of the high temperature melting. By which, the effects of different additives on the high-temperature viscosity were discussed. The results showed that: high temperature melt viscosity declined with the temperature increasing. In the same temperature, as the content of ZrO₂ in the fiber increased, melt viscosity was improved. But at high temperature zone, when the content of Al₂O₃ was more, the melt viscosity was declined. However, in the Low-temperature zone, with Al₂O₃ content increased, melt viscosity was declined a little.更多还原