DISSIPATING MATERIAL FROM SYNTHESIZED QUARTZ GLASS AND METHOD OF PRODUCING MOLDED ARTICLE COMPLETELY OR PARTIALLY CONSISTING OF IT Russian patent published in 2020 - IPC C03C3/06 C03B20/00 

FIELD: glass industry.

SUBSTANCE: dissipating material from synthesized pore-containing quartz glass has chemical purity of SiO₂ of at least 99.9 %, content of cristobalite is not higher than 1 % and density is within range from 2.0 to 2.18 g/cm³. In order to develop an improved scattering material in terms of Lambert's law of diffuse scattering in a wide wavelength range, high homogeneity of material and resistance to UV radiation, present invention proposes that quartz glass has content of hydroxyl groups higher than 200 parts per million, that at least 80 % of pores have maximum pore size less than 20 mcm and hydrogen content from 10¹⁷ to 10¹⁹ molecules/cm³. Method of producing molded article from such glass includes synthesis of transparent quartz glass by flame hydrolysis in a vacuum, grinding with subsequent wet grinding and obtaining a suspension of dust particles of SiO2, forming and sintering the article at temperature below 1400 °C with subsequent hydrogen filling in a hydrogen-containing atmosphere at pressure higher than 1 bar and temperature lower than 500 °C.

EFFECT: articles are used as a diffuser in spectroscopy, as a densitometric standard, for laser resonators and the like.

11 cl, 7 dwg