DONG Yingge 1, CHEN Shujiang 1, ZHANG Weiru 2
(1.Anshan Univers ity of Science and Technology;2.Shandong Research and Des ign Ins titute of Indus trial Ceramics )
Abstract: Silicon nitride ceramic was fabricated using Si3N4 powder of micron and nano- Si3N4, adding Al2O3 and Y2O3 to reinforce sintering, by isostatic pressing and sintered silicon nitride (SSN). So, Si3N4 ceramic have good properties to improve properties Si3N4 ceramic. In the paper, the dispersion of nano- Si3N4 powder, the influence of different nano- Si3N4concentration on silicon nitride mechanical properties , the influence of the different nano - Si3N4 concentration on s ilicon nitride ceramic using properties , the influence of different nano-Si3N4 concentration on silicon nitride ceramic micros tructure are studied. The experiments results indicated dispersion effect was better than others when PVA as disperser in ethanol solvent and time was 40 minutes through supersonic ins trument; AP and hygroscopic coefficient increased with content of nano - Si3N4.BD、bending strength、Rockwell hardnes sand、fracture tougness of specimens was maximum and micros tucture was perfect when content of nano- Si3N4 was 3wt%.
Keywords: nano- Si3N4，silicon nitride ceramic，properties，micros tucture