ZrO2包覆CaO-MgO-SiO2陶瓷纤维的制备及其性能

摘要

为了解决CaO-MgO-SiO2陶瓷纤维在使用过程中析晶、粉化的问题,采用非均相成核法在CaO-MgO-SiO2陶瓷纤维表面制备了ZrO2涂层.用场发射扫描电子显微镜观察ZrO2包覆层,用X射线衍射仪分析800和1 000℃热处理后原始纤维和ZrO2包覆纤维的晶相变化,并检测了二者在模拟肺液中的溶解性能.结果表明:包覆处理后,CaO-MgO-SiO2陶瓷纤维表面形成了一层ZrO2包覆层；ZrO2包覆层的存在可以显著抑制800℃时纤维的析晶,1000℃时只能抑制纤维中方石英的析出,对其他物相的析晶没有明显抑制作用；ZrO2包覆层的存在降低了纤维在模拟肺液中的早期溶解速率,但对纤维的长期生物可溶性影响不大.%In order to inhibit the crystallization and pulverization of CaO-MgO-SiO2 ceramic fiber at high temperatures,the ZrO2 coating on CaO-MgO-SiOj ceramic fiber was formed by heterogeneous-nucleation method. The crystal phase compositions of the original fiber and ZrO2 coated fiber fired at 800 °C and 1 000 °C were analyzed by X-ray diffractometer.and their solubility in Gamble solution was determined. The results show that; (1) a dense ZrO2 coating is formed on the surface of fiber; (2) the coating on fiber can inhibit the precipitation of crystals at 800 °C markedly and at 1 000 °C it only can inhibit the precipitation of cristobalite and has little effects on other crystal phases; (3) the coating decreases the initial dissolution rate of the fiber in Gamble solution and has little effect on long-term bio-solubility of fiber.