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AssigneeSchott Glaswerke
InventorsHartmut Paschke, Hermann Ditz
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For the production of a composite glass powder of any particle size from a fine particle size, multi-component mixture of a low-melting glass powder, fillers, and additives, the fine particle size, multicomponent mixture is sintered for 10-60 minutes at a temperature at which the base glass has a viscosity of 10.sup.5 to 10.sup.6.5 dPas, and the resultant sintered cake is ground to a powder of the desired particle size. If the multicomponent mixture comprises components decomposable with the release of gas, e.g., copper carbonate, the latter are decomposed prior to sintering at a temperature below the sintering temperature. The resultant composite glass powder containing copper oxide can be used for coating varistors.
A process for the production of composite glass powder of a desired particle size made from a fine particle size, multicomponent mixture, comprising a powder of a base glass and material selected from the group consisting of a filler, an additive, and mixtures thereof, said process comprising sintering the fine particle size, multicomponent mixture for 10-60 minutes at a temperature at which the base glass has a viscosity of 10.sup.5 -10.sup.6.5 dPas to form a sintered cake, cooling the cake, and grinding the resultant cooled sintered cake to a powder of the desired particle size.
A process for the production of a sintered cake made from a fine particle size, multicomponent mixture, comprising a powder of a base glass and material selected from the group consisting of a filler, an additive, and mixtures thereof, said process comprising sintering the fine particle size, multicomponent mixture for 10-60 minutes at a temperature at which the base glass has a viscosity of 10.sup.5 -10.sup.6.5 dPas to form a sintered cake, and cooling the cake.
Dependencies are inferred from the claim text.