ELECTROMAGNETIC SHIELDING GLASS

Results of the development of electromagnetic shielding glass compositions for protection against electromagnetic radiation are given in this work

DEVELOPMENT OF HEAT-RESISTANT GLASS COMPOSITIONS

Results of the development of refractory and heat-resistant glass compositions for a glazing of fireplaces are given in this work

DEVELOPMENT OFELECTROMAGNETIC SHIELDING GLASS COMPOSITIONS

Results of the development of electromagnetic shielding glass compositions for protection against electromagnetic radiation are given in this work

ВЛИЯНИЕ МОДИФИКАТОРОВ НА РЕОЛОГИЧЕСКИЕ И ТЕРМИЧЕСКИЕ СВОЙСТВА БОРОСИЛИКАТНЫХ СТЕКОЛ

Results of research for the glass system Na2O-K2O-B2O3-SiO2 at 2:1 molar ratio of K2O/Na2O modifiers are presented. It has been found that increasing (K2O+Na2O)/B2O3 ratio in glass compositions leads to higher low-temperature viscosity and viscosity gradient in the range of 109-104Pa-s. The established temperature dependences of viscosity allow to optimize borosilicate glass compositions with predetermined characteristics, as well as technological parameters of their synthesis and formation.Представлены результаты исследования стекол системы Na2O-K2O-B2O3-SiO2 при молярном соотношении модификаторов K2O/Na2O, равном 2:1. Установлено, что рост соотношения (K2O+Na2O)/B2O3 в составе стекол вызывает увеличение низкотемпературной вязкости и градиента вязкости в интервале значений 109-104 Па-с. Установленные температурные зависимости вязкости позволяют оптимизировать составы боросиликатных стекол с заданными характеристиками, а также технологические параметры их синтеза и формования

Glass for obtaining rigid optic fibers

The effect of rare-earth oxides (WO3, Gd2O3, Y2O3) on technological and physical-chemical characteristics of optical glasses for light-guiding fiber cores is investigated. Glass compositions for optical glass fiber which satisfy the main requirements imposed on them are synthesized. The glass compositions indicated can be used to produce fiber-optic article

Glass-ceramic cement for vacuum-tight joint

Synthesis of fusible glass of ZnO – PbO – B[2]O[3] system at the maintenance of components, wt %: B[2]O[3] – 10–45; ZnO – 5–40; PbO – 50–85 is carried out. It was established that stability of a vitreous state is defined by a ratio of ZnO / (PbO + B [2]O[3]) in the glass composition. Dependences of thermal and rheological characteristics of glass systems of ZnO – PbO – B[2]O[3] from a chemical composition are studied. The increase in the maintenance of B[2]O[3] superseded by PbO causes the essential growth of viscosity and decreas e of its gradient. The components able to reduce viscosity are arranged in the following way: B[2]O[3]→ZnO →PbO. By the results of research of glass rheological properties of ZnO – PbO – B[2]O[3] system, the area of glass compositions with viscosity less than 10{5} Pa · s at a temperature not over 450°C that provides the demanded spreadability indicators is defined. Regulation of indicators of TCLE is reached by creation of compositions glass – a crystal filler. Influence of such crystal filler as zircon, spodumene, cordierite on properties of composite glass-ceramic cement is re searched. The target TCLE indexes being equal to (77 ± 1) · 10{–7} K{–1} are achieved by the introduction of a spodumene. The composite glass-ceramic cement, intended for vacuum-tight connections of fiber-optical elements with a metal frame was developed. TCLE indexes of the glass-ceramic cement are equal to 77.2 · 10{–7} K{–1}, that coordinates it with TCLE containing a fiber-optical element. Temperature of composite glass-ceramic cement soldering is 450 ± 5°C, temperature of its deformation – 520 ± 5°C

High-index glass for the products of ophthalmologic optics

The results of development of high-index glass for the products of ophthalmologic optics on the basis of the systems Li2O – RO – B2O3– SiO2and K2O – TiO2– SiO2are presented. It is shown that the formation of complexes [TiO4/2O] 2– K2 + in glass of the system K2O – TiO2– SiO2interferes with the formation of the chromophorecenters Fe 2+ – O – Ti 4+ and allows to receive colorless glass at amount of TiO2to 30 mol.%. The compositions of glass with a refractive index 1.65 and 1.70 at density no more than 2.91 g/cm 3 are developed. It allows to recommend them for the production of the facilitated lenses with a high optical force

ELECTROMAGNETIC SHIELDING LEAD-BORATE GLASSES

Results of the development of lead-borate glass compositions, which reduce the effect of microwave electromagnetic radiation are presented