影响ZTA陶瓷微波烧结的主要工艺过程

Processes Affecting Microwave Sintering of ZTA Ceramics

通过对ＺＴＡ陶瓷进行微波烧结试验，了解影响陶瓷微波烧结速率的主要工艺过程，探索有关微波烧结机理；采用以ＴＥ４４４为基准模式的微波谐振腔，在混合加热模式的基础上增设辅助加热体，实现了ＺＴＡ陶瓷微波烧结； ＺＴＡ材料中ＺｒＯ２含量越高，该材料的烧结速率越快；输入功率的提高有助于提高烧结速率；辅助加热体的老化现象降低微波烧结速率；微波烧结过程中应避免出现热剧变现象．

The Al2O3-ZrO2 system was chosen to be fabricated by microwave sintering. The principal processes affecting the sintering rate were analysed on account of the properties of ZTA ceramics. The TE444 multi-mode microwave system was designed and a hybrid heating system was developed with well arranged aided heaters. The ZrO2 content in ZTA samples affected the microwave sintering rate, which showed the probability for the low-loss materials to be sintered by microwave process mixed with high-loss materials to raise their sintering rate. The increase of the inlet power made the temperature raise rapidly. The aging phenomena of the aided heaters lowered the sintering rate and the thermal runaway should be avoided to advance the sample properties.