METHOD OF PRODUCING HIGH DENSITY QUARTZ CERAMICS AND ARTICLES THEREOF Russian patent published in 2017 - IPC C04B35/14 B29C41/16 

FIELD: chemistry.

SUBSTANCE: method of producing high density quartz ceramics and articles thereof includes the preparation of an aqueous silica glass slurry with a density of 1.85-1.90 g/cm³, forming of ceramic billets of articles by the method of aqueous slip casting in gypsum moulds, drying and roasting in electric furnaces with air atmosphere. The aqueous slurry of quartz glass has a polydisperse grain composition in the range of 0.1-300 mcm, of which particles of up to 5 mcm are 25-35%, particles of up to 63 mcm are 94-98%. Moulding the billets of articles is carried out in plaster forms, the working surface that is saturated with a finely dispersed sludge of silica slurry or gating draining, and calcination is carried out at a maximum temperature of 1260-1280°C for 6-8 hours with intermediate exposures in 1100±50°C for 1±0.5 hours on the rise for equalizing the temperature of the article during cooling for calcining and removing thermal and shrinkage stresses. For producing water slurry, quartz glass and grinding media made of transparent quartz glass without a trace cristobalite are used, and grinding and stabilisation of surrey are carried out in mills lined with quartz glass or quartz ceramic.

EFFECT: method allows to produce large-sized articles, including thin-walled, with a high degree of uniformity, high strength and stable dielectric characteristics over a wide range of temperatures.

2 cl, 1 tbl, 3 ex