The result of the xrd , sem and tem analysis show that the densification process was controlled by the mechanical of liquid phase sintering with the addition of mgo and ce02 as the sintering aid . the mgo - ceo2 would react with the sio2 which was on the surface of the silicon nitride particles to from silicate liquid phase to accelerate the densification 通过xrd 、 sem 、 tem等测试结果表明，由于同时添加了mgo和ceo _ 2作为助烧剂，其致密化过程为液相烧结，由烧结助剂和si _ 3n _ 4表面的sio _ 2反应形成低熔点的硅酸盐相，促进烧结致密化，冷却后，在晶界形成玻璃体。
