CAJ | 학술논문

以叔丁醇为成型溶剂, 莫来石粉为起始原料, 采用凝胶注模成型方法制备出轻质、高强莫来石多孔陶瓷. 莫来石多孔陶瓷中的孔隙形成于干燥过程中叔丁醇的快速挥发, 孔隙分布均匀且相互连通. 随烧结温度升高, 气孔率、开气孔率和比表面积分别由77.8%、76.0%和10.39m~2/g下降到67.6%、65.5%和4.26m~2/g, 而抗压强度则由3.29MPa显著提高到32.36MPa, 材料孔径大小受烧结温度影响较小, 孔径尺寸呈单峰分布, 且几乎所有的气孔都为开口气孔, 透气度与孔径尺寸具有一致的变化关系. 莫来石多孔陶瓷在高气孔率条件下仍然保持高强度的主要原因是材料中均匀的孔隙结构、孔径尺寸小且相对集中、以及因烧结颈的形成在空间上所表现出的一种颗粒搭接骨架结构.
이숙정순위성형용제, 막래석분위기시원료, 채용응효주모성형방법제비출경질、고강막래석다공도자. 막래석다공도자중적공극형성우간조과정중숙정순적쾌속휘발, 공극분포균균차상호련통. 수소결온도승고, 기공솔、개기공솔화비표면적분별유77.8%、76.0%화10.39m~2/g하강도67.6%、65.5%화4.26m~2/g, 이항압강도칙유3.29MPa현저제고도32.36MPa, 재료공경대소수소결온도영향교소, 공경척촌정단봉분포, 차궤호소유적기공도위개구기공, 투기도여공경척촌구유일치적변화관계. 막래석다공도자재고기공솔조건하잉연보지고강도적주요원인시재료중균균적공극결구、공경척촌소차상대집중、이급인소결경적형성재공간상소표현출적일충과립탑접골가결구.
Porous mullite ceramics with low density and high strength were fabricated by TBA-based gelcasting process using tert-butyl alcohol (TBA) as shaping solvent. The pores of porous mullite ceramics formed from the quickly evaporation of TBA during drying of green bodies. Uniformly distributed and interconnected pores were obtained. With increasing sintering temperature, the porosity, open porosity and specific surface area of porous mullite ceramics decrease from 77.8%, 76.0% and 10.39m~2/g to 67.6%, 65.5% and 4.26m~2/g, respectively, in contrast, the compressive strength significantly increases from 3.29MPa to 32.36MPa. The pore size is not significantly influenced by the sintering temperature. The pore size presents single peak distribution, and almost all pores are open. Air permeability is in accordance with the pore size. The reasons for high strength of porous mullite ceramics under high porosity are mainly due to the uniformly porous structure, small and relatively concentrated pore size, and the formation of sintering neck which shows a skeleton structure of particle bond in stereo-space.