摘要
采用板状刚玉(<0.044 mm)、活性氧化铝(d50=1.7μm)为主要原料,CMC为结合剂,分别制备了无添加剂、添加TiO2、添加ZrO2以及复合添加ZrO2和TiO2 4种刚玉质陶瓷蓄热体试样;试样经1550℃保温2 h热处理后,检测了其热震稳定性、显气孔率和热膨胀系数。结果表明:与无添加剂和单独添加TiO2、单独添加ZrO2的刚玉质陶瓷蓄热体试样相比,复合添加ZrO2和TiO2的刚玉质陶瓷蓄热体试样的热震稳定性显著提高,其原因是:ZrO2的马氏体相变产生微裂纹增韧、钛酸铝(AT)与刚玉的线膨胀系数差形成微裂纹增韧及AT的线膨胀系数低三者协同增韧的机制显著提高了刚玉质陶瓷蓄热体试样的热震稳定性。
The four kinds of corundum porcelain regenerator samples were prepared with main starting materials of tabular corundum （ 〈 0. 044 ram） and active alumina （ d50 = 1.7 μm）, binder of CMC. Respectively the four kinds of samples are non-additive, adding titanium oxide additive, adding zirconia additive, adding titanium oxide and zirconia multiplex additive. After fired at 1550℃ for 2 h, the thermal shock resistance, the apparent porosity and thermal expansion coefficient of samples were tested. The results show that the thermal shock resistance of sample of adding titanium oxide and zirconia multiplex additive compared with other sampls＇were obviously improved. The reasons are that zirconia＇ s phase transformation causes microcrack toughening, the difference of thermal expansion coefficient between aluminum titanate and corundum forms microcrack toughening, aluminum titanate＇ s thermal expansion coefficient is lower. The three synergistic toughening mechanism obviously improves thermal shock resistance of samples of adding titanium oxide and zirconia multiplex additive.
出处
《硅酸盐通报》
CAS
CSCD
北大核心
2011年第3期550-553,共4页
Bulletin of the Chinese Ceramic Society
关键词
氧化锆
氧化钛
刚玉
热震稳定性
协同增韧
zirconia
titanium oxide
corundum
thermal shock resistance
synergistic toughening
