Glass manufacturing – Processes – With shaping of particulate material and subsequent fusing...
Patent
1986-05-19
1988-05-31
Lindsay, Robert L.
Glass manufacturing
Processes
With shaping of particulate material and subsequent fusing...
65 311, 65 184, 65DIG900, 65DIG901, 65 32, 156DIG108, 264 56, 501 12, C03B 37016
Patent
active
047478632
ABSTRACT:
A method of manufacturing glass bodies, in which the starting material for the glass body, being monodispersed SiO.sub.2 particles (quartz-glass powder), is used to form an open-pore green body which is subjected to a purification process in which the impurities present in the green body react with a purifying gas which is heated to a temperature in the range from 600 to 900.degree. C., after which the green body is sintered, in which a two-stage heating-purification step is used, such that in the first stage SiO.sub.2 particles are heated until they are dense-sintered, i.e. they have no more micropores, and in the second stage the homogeneous open-pore green body formed from the dense-sintered SiO.sub.2 particles is purified in a known manner in the purification gaseous atmosphere and subsequently sintered.
REFERENCES:
patent: 4417910 (1983-11-01), Passaret
patent: 4419115 (1983-12-01), Johnson et al.
patent: 4426216 (1984-01-01), Satoh et al.
patent: 4574063 (1986-03-01), Scherer
Clasen Rolf
Opitz Joachim F. A.
Bartlett Ernestine
Lindsay Robert L.
U. S. Philips Corp.
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