Method for manufacturing low temperature fired ceramics

A method of making a ceramic article which is fired at a relatively low temperature, comprisign the steps of:

• forming a green sheet from a mixture of an organic binder and a ceramic raw material, said ceramic raw material being firable at a temperature of from 800.degree. to 1000.degree. C. and consisting essentially of, in weight percentages,
• (a) from 50 to 65% of a powdered, noncrystalline CaO-Al.sub.2 O.sub.3 -SiO.sub.2 glass consisting of
• 10 to 55% of CaO,
• 45to 70% of SiO.sub.2,
• and 0 to 30% of Al.sub.2 O.sub.3 as base components, and
• up to 10% of impurities;
• (b) from 50 to 35% of powdered Al.sub.2 O.sub.3 containing up to 10% of impurities;
• and
• (c) up to 20% of B.sub.2 O.sub.3, based on the sum of (a) and (b);
• then continuously moving said green sheet through an air furnace having a binder-removing zone followed by a sintering zone wherein, in said binder-removing zone, said green sheet is rapidly heated at a heating rate of from 10.degree. to 200.degree. C./min and simultaneously air is blown through said binder-removing zone of said furnace so that the air feed ratio, in N1/min, is at least 1.5, wherein ##EQU3## whereby to remove said binder from said sheet, then, in said sintering zone, sintering said sheet at a temperature of from 800.degree. to 1000.degree. C.