Oxynitride glass and the fiber thereof
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United States of America Patent
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Sep 18, 1990
Issued Date -
N/A
app pub date -
Mar 6, 1989
filing date -
May 28, 1987
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An oxynitride glass, a process for preparing same and a fiber thereof, in the glass which has Si--M.sub.1 --M.sub.2 --O--N system and contains SiO.sub.2, Si.sub.3 N.sub.4 and M.sub.1 O in amounts which, as mole %, satisfy the following equations (a) and (b): (SiO.sub.2 +3Si.sub.3 N.sub.4 +M.sub.1 O) X 100 / (100+2Si.sub.3 N.sub.4)=65 to less than 100 (a) (SiO.sub.2 +3Si.sub.3 N.sub.4)/M.sub.1 O=0.7 to 2.3 (b) wherein M.sub.1 is Ca, or Ca and Mg; M.sub.2 is at least one of the metal selected from the group consisting of Al, Sr, La, Ba, Y, Ti, Zr, Ce, Na, K, Sb, B, Cr, Pb, V and Sn, said glass containing 0-40 mole% SiO.sub.2, 26-70 mole % CaO, 0-20 mole % MgO, and over O to not more than 22 at % M.sub.2.
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