| 摘要 |
Amorphous oxide powders of the elements beryllium, magnesium, aluminium, boron, zirconium, thorium and silicon or the mixed oxides of silicon with these elements, in which the oxygen has been partially replaced by bound nitrogen, are used as starting materials. These amorphous oxide powders containing bound nitrogen are pressed in a first stage at temperatures above the glass-softening temperature but below the crystallisation temperature to give a glassy moulded article, and the latter is then heated in a second stage to temperatures above the crystallisation temperature. 5 to 30% of the oxygen are replaced by bound nitrogen in the case of the individual oxides, and 50 to 90% in the case of the mixed oxides of silicon with these elements.
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