Nitridation Behaviour,Microstructure and Proerties of Si—SiC Compostites Seeded with Morphologically Regulated β—Silicon Nitride Crystals  

作　　者：K.Amoako－Appiagyei SooYoungLee 等 

机构地区：[1]DepartmentofInorganicMaterialsEngineering,KyungnamUniversity,449WolyoungDong,MasanCity,Korea [2]Departme

出　　处：《China's Refractories》1999年第2期22-26,共5页中国耐火材料（英文版）

摘　　要：Nitridation of Si-SiC compacts ,containing β-Si3N4 single crystals as seed ,showed a higher yield of nitride with increase of the seed content,Samples containing seed with the largest aspect-ratio gave the best nitridation results.The evolution of the large epitaxially-grown grains,from the seed( as nucleus),during the subsequent liquid phase sintering process,gave ,rise to a bi-modal microstructure,The population of large grains was found to inrease with the volume of added seed.Samples containing 3 volume % exhibited the best mechanical properties,Fracture toughness of the sintered reaction bonded silicon nitride showed improvement in excess of 35% compared to the baselince Si3N4.

关 键 词：微观结构 刚玉 金刚砂 四氮化三硅 晶体 氮化作用 晶种 

分 类 号：TQ175.712.2[化学工程—硅酸盐工业]