Fabrication of Cordierite Ceramics by Densification/Crystallization of Glass Compacts and Evaluation of Their Thermal Shock Fracture Resistance
Fabrication of Cordierite Ceramics by Densification/Crystallization of Glass Compacts and Evaluation of Their Thermal Shock Fracture Resistance
复制标题
玻璃坯体致密化/结晶化制备堇青石陶瓷及其抗热震断裂性能评价
DOI：
10.2109/jcersj.106.385
复制
发表时间：
1998
影响因子：
1.1
通讯作者：
Isamu Inada
中科院分区：
文献类型：
--
作者：
K. Hayashi;Mitsuhiro Hasegawa;Y. Okamoto;K. Ueno;Hiroshi Seno;Isamu Inada
将2 MgO·2Al 2 O3·5SiO 2玻璃坯体和添加少量ZrO 2的玻璃坯体在1373 K下以6 K/min和20 K/min的升温速率烧成1h，制备了4种堇青石陶瓷，通过对淬火试样抗弯强度的快速变化，研究了它们的抗热震断裂性能。在6 K/min烧成条件下，化学成分接近堇青石的烧结体的临界淬火温度差（ΔTc）约为650 K，而在20 K/min烧成条件下，ΔTc= 550 K，而少量ZrO_2的堇青石陶瓷的ΔTc为500- 550 K。虽然在堇青石组成中添加ZrO 2和高加热速率使烧结体具有更高的强度，但由于烧结体的杨氏模量和热膨胀系数同时增加，因此没有认识到对ΔTc增加的影响。
Four kinds of cordierite ceramics were fabricated by firing the glass compacts having the composition of 2MgO⋅2Al2O3⋅5SiO2 and the same composition with small amount of ZrO2 at 1373K for 1h at heating rate of 6K/min and 20K/min. Their thermal shock fracture resistance was investigated through a rapid change in bending strength of quenched specimen. The critical quenching temperature difference (ΔTc) of the sintered bodies with the chemical composition close to cordierite fired at 6K/min was about 650K, while the ΔTc=550K for the sintered bodies fired at 20K/min. On the other hand, the cordierite ceramics with small amount of ZrO2 revealed to have 500-550K as their ΔTc. Although an addition of ZrO2 to cordierite composition and high heating rate have given rise to higher strength of sintered bodies, no effect on an increase in ΔTc was recognized because Young's modulus and the thermal expansion coefficient of sintered bodies increased simultaneously.