| http://www.w3.org/ns/prov#value | - By using such an inert gas atmosphere in firing (namely, the stage before melting of Si and impregnation with Si), gas such as CO generated with the change of inorganic polymer or inorganic material into ceramics can be removed from the firing atmosphere and, in addition, external pollution of the firing atmosphere with O2 or the like in the air can be inhibited.
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