Plastic and nonmetallic article shaping or treating: processes – Heat polishing of inorganic article surface outside of mold – With coating outside of mold
Patent
1997-06-04
1999-07-13
Fiorilla, Christopher A.
Plastic and nonmetallic article shaping or treating: processes
Heat polishing of inorganic article surface outside of mold
With coating outside of mold
264651, B28B 126
Patent
active
059222719
ABSTRACT:
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.
REFERENCES:
patent: 3582385 (1971-06-01), Duke et al.
patent: 3600204 (1971-08-01), Beall et al.
patent: 3715220 (1973-02-01), Confer et al.
patent: 3732116 (1973-05-01), Reade
patent: 3816704 (1974-06-01), Borom et al.
Aloy Bartolome
Burkner Monika
Dunkl Michael
Mirsch Klaus
Pannhorst Wolfgang
Fiorilla Christopher A.
Schott Glaswerke
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