PHOSPHATE GLASSES: FORMING, STRUCTURE and PROPERTIES

抄録

The structure and some properties of the glasses in the ternary systems (I) BaO. B₂O₃-xP₂O₅ (x=0...60mol.%) and (II)BaO. 2P₂O₅(3P₂O₅)- xSiO₂ (x=0...40mol.%) as well as in SiO₂-P₂O₅ with molar ratio SiO₂/P₂O₅=1 were studied. The structure of glasses were characterised by their Raman spectra and compared with the phases developing in the treatment process. The chemical durability and density also was used to characterise the changes in the structure of glasses. It is shown that glasses are formed by the same structural groupings which are developed in thermal treatment of starting compositions. The changes in the glass structure causes the first 5-10 mol.% addition of other glass formers P₂O₅ or SiO₂. For these glasses in system I in concentration range of P₂O₅ 25-33.3 mol.% there are being formed the weakly connected BPO₄, BO₃ and BO₄ groups. It is shown that the most promising application by the modification of these glasses of Al₂O₃ are heat resistant coatings for Nb+1%Zr alloys.