窒化ケイ素の泥しょう鋳込成形と焼結体の機械的特性(第1報) : 直接窒化窒化ケイ素粉体の泥しょう調製条件と機械的特性

概要

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To develop a complicated shape forming method for the fabrication of Si_3N_4 engineering ceramic parts slip casting was studied. As the powder characteristics, the isoelectric points of α-Si_3N_4 (by direct nitridation, median particle size=1.56 μm), α-Al_2O_3 and Y_2O_3 were determined from zeta-potential measurement to pH=4.9, 8.33 and 9.55, respectively. The preparation conditions of well-dispersed slurries were determined for the solid (92 wt%α-Si_3N_4, 4 wt%α-Al_2O_3, 4 wt% Y_2O_3) by using an organic polymer deflocculant. High-density green body (density=1.95-2.18 g/cm^3) was prepared from the slurry (75-80 wt%solid) by vacuum filtration with a porous resin mold. Fully densified specimens were obtained by gas pressure sintering (at 1770℃ for 4 h at a N_2 pressure of about 0.9 MPa). The flexural strength and Weibull modulus of the specimen decreased from 726 to 611 MPa and from 14.8 to 6.5 with increasing amount of binder from 0 to 4 wt%.
社団法人日本セラミックス協会の論文
1992-05-01