多量のチタン(IV)を含有するリン酸塩ガラス及びガラスセラミックスの製造と性質

概要

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Phosphate glasses containing very large amounts of TiO_2 have been prepared in the compositions of (3Na_2O・67TiO_2・30P_2O_5) +5SiO_2(mol%) (Glass 1) and (3Na_2O・72TiO_2・25P_2O_5) +5SiO_2 (mol%) (Glass 2) . The thermal expansion coefficient (a) from 30 to 600℃ were 7.7×10^<-6>℃^<-1> and 6.9x 10^<-6>℃^<-1>, respectively. The glass ceramics prepared by heating Glass I at temperatures in 50℃ intervals from 800 to 1000℃ for 30h had a = 0.7-2.2×106℃^<-1> and glass ceramics prepared by heating Glass 2 at various temperatures from 900 to 1100℃ for 30h had a=1.6-8.4× 10^<-7> ℃^<-1> in the same temperature range. The bending strengths of the glass ceramics from Glass 1 were larger than those from Glass 2. The low thermal expansions of these glass ceramics were attributed to NaTi_2 (PO_4)_3 like phase, TiO_2 and (TiO)_2P_2O_7 produced by crystallization, and the bending strengths were greatly influenced by the crystalline phases. The Na_Ti_2 (PO_4)_3 like phase seems to be a solid solution of Na_Ti_2 (PO_4)_3 and Si^<4+> , Na_<1+x>Ti_2P_<3-x>Si_xO_<12>, as judged from the differences between the lattice parameters of this phase and those of NaTi_2 (PO_4)_3.
社団法人日本セラミックス協会の論文
1994-02-01