Schott Glaswerke

Schott Glas

Janusz Zborowski

Waldemar Weinberg

Wolfgang Pannhorst

Wolfgang Semar

Michael Dunkl

Klaus Mirsch

Bartolome Aloy

Uwe Eichhorn

Monika Burkner

Bartolome Aloy-Dols

Werner Waidhas

The process for making the high temperature-resistant ceramic material from the MgO&mdash;Al,O,system includes burning a mixture containing a predetermined amount of magnesium oxide (MgO) of a predetermined grain size distribution in an amount range of from 30 to 99 parts by weight and a predetermined amount of magnesium aluminate (MgAl,O,) of another different predetermined grain size distribution in a range of from 1 to 70 parts by weight to obtain a ceramic product having a thermal expansion coefficient and selecting the amounts of magnesium oxide and magnesium aluminate as well as the predetermined grain size distributions so that the thermal expansion coefficient of the ceramic product is substantially equal to that of platinum and platinum alloys and in a range of from 9&times;10,K,to 15&times;10,K,.

Process for making a high temperature-resistant ceramic material with an adjustable thermal expansion coefficient and method of use of same

A method for the manufacture of dense-sintered glass-ceramic shaped objects which have a coefficient of thermal expansion, .alpha., of -0.5.times.10.sup.-6 /K to 1.8.times.10.sup.-6 /K in the range between 20.degree. C. and 700.degree. C. whereby ceramizable glass powder and/or glass-ceramic powder from the system Li.sub.2 O-Al.sub.2 O.sub.3 -SiO.sub.2 is slip-cast by means of porous molds, dried, pretempered if necessary at temperatures up to 600.degree. C., vitrified and then sintered until the sintering temperature is reached up to relative densities of greater than 0.96 and ceramized, and whereby the glass powder and/or the glass ceramic-powder is prepared in a first grain size fraction of less than 63 .mu.m, in particular less than 45 .mu.m, and in a second grain size fraction of less than 7 .mu.m, in a ratio of the fractions to one another between 2:1 and 4:1, to form a stable, pourable slurry. The method can be used for the manufacture of industrial ceramics, but also for the manufacture of complex-shaped, large-volume and thin-walled hollow containers, in particular for use as cooking utensils which are resistant to thermal shock, as well as for dinnerware, solid ceramic castings and composites.

Method for the manufacture of dense-sintered glass ceramic moldings

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Ingelheim, Germany

Janusz Zborowski