耐アルカリ性BaO-SiO_2-TiO_2ガラス繊維の機械的性質

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Tensile strengths of newly developed alkali-resistant glass fibers based on SrO-BaO-SiO_2- TiO_2 were investigated as a function of exposure time to a Portland cement aqueous phase (PCAP) solution at 95℃, and compared with those of conventional alkali-resistant glass fibers based on Na_2O-SiO_2-ZrO_2. Glass fibers of the compositions 15 SrO, 15 BaO, 30 SiO_2, 40 TiO_2 in mol% (S 4-15 Sr) and 7 Na_2O, 5.75 CaO, 5.75 SrO, 11.5 BaO, 30 SiO_2, 33 TiO_2, 7 ZrO_2 in mol% (S 4 -134) showed twice as high tensile strengths as those of the compositions 1 Li_2O, 11 Na_2O, 1 Al_2O_3, 71 SiO_2, 16 ZrO_2 in mol% (G20) and 17.5 Na_2O, 6 CaO, 67 SiO_2, 9.5 ZrO_2 in mol% (68 EF 88) after exposure to the PCAP solution for 108 hours, as well as before exposure (Fig. 2) . Fracture toughness K_<IC>'s of the former glasses, which were obtained by microindentation method, did not appreciably differ from those of the latter glasses ( Table 2) . Accordingly, higher strengths of the former glasses were attributed to smaller cracks caused at the surfaces (Fig. 7) . The smaller size of cracks for the former glasses was interpreted in terms of formation of a dense and homogeneous layer (Fig. 6) rich in Ti02 and CaO at the surfaces by chemical reaction with the cement solution ( Table 3).
社団法人日本セラミックス協会の論文
1988-10-01