镁铝尖晶石陶瓷的高温Mo-Mn金属化机理研究

Investigation in Metallizing Mechanisms of MgAl_2O_4 Ceramics by Molybdemum-Manganese Process

采用活化Mo-Mn法对镁铝尖晶石陶瓷进行了金属化封接实验,并通过对镁铝尖晶石陶瓷金属化层的显微结构及金属化层中元素在金属化层与陶瓷中分布情况的分析,探讨了镁铝尖晶石陶瓷的Mo-Mn金属化机理。研究发现,镁铝尖晶石瓷的金属化机理与目前较成熟的95%氧化铝瓷的金属化机理存在很大不同。镁铝尖晶石瓷金属化时,Mn元素沿晶界实现固相扩散迁移,固溶于瓷中,与镁铝尖晶石形成Mn:Mg Al2O4尖晶石相;同时,Mg元素沿晶界析出进入金属化层的玻璃相,填充于Mo海绵骨架中。

Activation molybdenum-manganese process was adopted to metallize and seal MgAl2O4 ce- ramics. The metallizing mechanisms of MgAl2O4 ceramics by molybdenum-manganese process was dis- cussed by analyzing the microstructure of the metallized layer and the distribution of the elements in the ce- ramics and metallized layer. It was found that there was obvious different between the metallizing mecha- nism of MgAl2O4 ceramics by molybdenum-manganese precess and that of 95 MgAl2O4 ceramics. During the metallization process of MgAl2O4 ceramics, the Mn element in the metallized layer migrated into the MgAl2O4 ceramics along the grain boundaries and formed the Mn： MgAl2O4 spinal phase with the MgAl2O4, at the same time, the Mg element in the MgAl2O4 ceramics was separated out and migrated into the metallized layer along the grain boundaries, and generated the glass phase with composites such as SiO2.