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 nitri...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.展开更多
文摘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.
