摘要
本工作采用OM、XRD、SEM和EDAX诸仪器研究了ZrO_2-3Al_2O_3·2SiO_2-Al_2O_3系在缓冷和淬火条件下各组成试样的相关系。在该系的三元不变点附近选择了15个试样,其ZrO_2含量为30—35Wt％,Al_2O_3/SiO_2比(mol)为1.5—2.0。用OM和SEM观察了缓冷和淬火试样的析晶形貌特征。试样从1750℃淬火,析出细纤维状莫来石和亚显微质四方ZrO_2,在较低温度淬火或缓冷时,四方ZrO_2转变为单斜相并得到典型的莫来石-斜锆石共析体。在缓冷试样中可观察到包晶反应形貌。XRD分析表明缓冷和淬火的莫来石晶格常数的变异。用EDAX点分析,测出了莫来石和斜锆石具有组份互溶性。在本试验组成区域内不宜确定精确的三元不变点。
The phase relationship of the components in the vicinity of the ternary invariant point in the ZrO_2-3Al_2O_3·2SiO_2-Al_2O_3 system under fusion-slow cooling and fusion-quenching condition respectively was studied by means of OM, XRD, SEM and EDAX. 15 samples which consist of ZrO_2 30—35wt% and A/S ratio 1.5—2.0 were selected for study. The idiomorphic characters of crystals in slowly cooled and quenched samples were investigated by OM and SEM and phase components were detected by XRD. The microfibrous mullite and submicrostructural t-ZrO_2 will crystallize when it is quencned at 1750℃. and then t-ZrO_2 will transform to m-ZrO_2. The so-called typical(M+Z) is obtained in both cooling and quenching at 1700℃. On account of such mutualsolubility and the peritectic reaction occured during slow cooling, it may be considered that the ternary invariant point or eutectic point cannot be accurately determined in the region men(?)ed above.
出处
《硅酸盐学报》
EI
CAS
1988年第3期280-288,共9页
Journal of The Chinese Ceramic Society
