Si_3N_4-Yb_2O_3-AlN-SiO_2系の相関係とサイアロン及びオキシナイトライドガラスの生成

概要

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The region of α′- and β′-sialons in the Si_3N_4-Yb_2O_3-AlN system, glass forming ragion in the Yb_2O_3-AlN-SiO_2 system, the phase relation of the quasiternary Si_3N_4-(Yb_2O_3)_<0.4>(AlN)_<0.6>-SiO_2 system, and properties of oxynitride glasses have been studied. The region of α′- and β′-sialons had some width in the Si_3N_4-Yb_2O_3-AlN system. Lattice parameters of α′- and β′-sialons increased with increasing amount of additives. The solubility of Si_3N_4 in the liquid of Yb_2O_3-AlN-SiO_2 system was small. The glass transition temperature, softening temperature and Vickers hardness of oxynitride glasses in the Yb_2O_3-AlN-SiO_2 system were measured as a function of composition. Yb-sialons were suggested coexist with liquid phase at temperatures higher than about 1460°C.
1995-08-01