For combustion device window Li2O-Al2O3-SiO2-based crystalline glass and Li2O-Al2O3-SiO2-based crystallized glass for become combustion device window by heat-treating it

摘要

PROBLEM TO BE SOLVED: To provide an inexpensive crystallized Li₂O-Al₂O₃-SiO₂ glass which resists to the formation of microcracks on its available surface even after long-term exposure to a sulfuric acid-containing combustion atmosphere formed when a fuel such as petroleum, coal, gas, or wood is burnt and to provide a crystallizable Li₂O-Al₂O₃-SiO₂ glass being a base material for the same.;SOLUTION: The crystallizable Li₂O-Al₂O₃-SiO₂ glass is characterized in that the β-OH content is at least 0.20/mm and the number of 2 μm or longer surface cracks on the available surface is at most 140 per cm².;COPYRIGHT: (C)2006,JPO&NCIPI