Quartz Ceramics Research Articles

Crystallization process in quartz ceramics

Cristobalite formed at low temperatures (below 1200°C) in contrast to cristobalite obtained by heating at higher temperatures does not give sharp volume changes when heated, as a result of which its presence in quartz ceramic, even in significant amounts, does not cause failure when subjected to thermal shock. Additional heat treatment of quartz ceramic at elevated temperatures for crystallization is undesirable since this process occurs during heating in working conditions.

Investigating the ?aging? process in quartz ceramics

On etudie les modifications des proprietes mecaniques des ceramiques de quartz en liaison avec leur densification ulterieure et la cristallisation du quartz fondu dans le processus de traitement thermique

Influence of impurities in oxides of alkalis and alkaline earth metals on the properties of quartz ceramics

Influence of impurities in oxides of alkalis and alkaline earth metals on the properties of quartz ceramics

Strengthening unfired quartz ceramics

Strengthening unfired quartz ceramics

Structure of quartz ceramics

Structure of quartz ceramics

Glass resistance of quartz ceramics

Glass resistance of quartz ceramics

Quartz ceramics made from fused Vol'nogorsk sand

Quartz ceramics made from fused Vol'nogorsk sand

Changes in the structure of quartz ceramics in service

Changes in the structure of quartz ceramics in service

Obtaining quartz ceramics from synthetic silicon dioxide

Obtaining quartz ceramics from synthetic silicon dioxide

Regulating the properties of slips in the production of fused quartz ceramics

Regulating the properties of slips in the production of fused quartz ceramics

Technological features of the production of quartz ceramics

Technological features of the production of quartz ceramics

Producing quartz ceramics with a controlled solidification regime

Producing quartz ceramics with a controlled solidification regime

Quartz ceramics made from thermoplastic suspensions

A technology was developed and introduced for making quartz sleeves (TU 14-8-233-77) by the hot-casting method using thermoplastic suspensions. This does not involve the use of preliminary firing in a filling of refractory powder to burn out the binder.

Thermal and temperature conductivity of quartz ceramics in the range 500?1900�K

Thermal and temperature conductivity of quartz ceramics in the range 500?1900�K

Highly spalling-resistant ceramic based on quartz glass and organosilicon products

A technology was developed for the production of highly spalling-resistant quartz ceramics from quartz glass with an organosilicon binder (resin or lacquer), together with methods of producing large blocks with high glass and slag resistance from this ceramic. The material is being used at the Saratov Technical Glass Plant, where it produces a savings of 250,000 rubles/yr.

Creep in quartz ceramics

Creep in quartz ceramics

The slip casting rate for quartz ceramics

In an investigation of the influence of the principal factors on the rate of slip casting quartz ceramics it was established that the density (porosity) of the deposited cast body is the main determining factor in the casting rate. The density of the body depends on the degree of stabilization, the pH, and the granularity of the slip suspension, and on the use of vibration. The casting rate may vary tenfold with the porosity of the casting. The factors which increase the density of the casting reduce the casting rate to the same extent, and vice versa. The casting rate is influenced, moreover, also by the water/plaster ratio of the mold and by the moisture content (density) of the slip suspension.

A metallothermic method of preparation of cermets

1. A study was made of the morphological characteristics of molecular cermets synthesized by the reduction of silica in molten aluminum. A relationship is shown to exist between the structure of the resultant cermets and that of the starting ceramics. The most homogeneous and finely dispersed structure is exhibited by cermets based on vacuum-compression quartz glass and dense quartz ceramics. 2. It was established that the distribution of the metallic and ceramic phases and a variety of defects in molecular cermets has a statistical character. The presence of defects is linked with the defectiveness of the starting ceramics used and with the mechanism of the chemicothermal impregnation process. 3. The chemicothermal character of impregnation of quartz ceramics in molten aluminum is responsible for the intense sintering and segreation of individual phases in molecular cermets, resulting ultimately in the formation of a stabilized structure. 4. The correlation between the mechanical properties and structure of the cermets and also the dependence of their mechanical properties on the porosity of the starting quartz ceramics were established.

Electric furnace for firing quartz ceramics

Electric furnace for firing quartz ceramics

Processes in producing clinker and casting quartz ceramics

A study was made of methods for obtaining slips for casting quartz ceramics: the double-stage, single-stage, suspension, maximum saturation, and with additions of granular fillers. We achieved slip concentrations and cast densities appreciably exceeding well-known data for various ceramic materials.