Study of heat and mass transfer during firing of heat insulation objects based on burnt rocks and beidellite clay

Heat and mass transfer is studied during firing of ceramic heat insulation objects making it possible to monitor firing taking account of a change in the effective thermal properties of an object, manufactured using burnt rocks, in the temperature range of physicochemical transformations, and also to determine rational firing regimes. It is revealed that the least value for the coefficient of effective thermal conductivity for the material corresponds to a temperature range within which the intensity of physicochemical processes is more significant.     

Influence of coal-enrichment wastes on the heat and mass transfer in firing light bricks

Investigation of the heat and mass transfer in the firing of light ceramic brick permits the regulation of the process (in accordance with the change in effective thermal characteristics of the brick when fuelindustry wastes are used) and the determination of rational firing conditions. The effective thermal diffusivity of the brick is least in the temperature range where physicochemical processes are most intense.     

Development of ceramic anchors for installing fibrous heat insulation

Conclusions The Ukrainian Scientific-Research Institute of Refractories developed a method for making ceramic anchors for fixing fibrous heat insulation into furnaces operating at temperatures of up to 1350°C, and also with controlled atmospheres up to 1600°C.Translated from Ogneupory, No. 8, pp. 21–23, August, 1991.     

Calculation of efficiency in the use of ceramic heat insulation in periodic furnaces

A calculation of the economic feasibility of applying fiber-ceramic heat insulation for hte lining of a periodic furnace at OAO Volgogradneftemash instead of ShA-1 fireclay refractory is presented. The advantages of a fiber-ceramic lining by comparison with unitary lining are indicated.     

Decorative ceramic coatings based on industrial wastes of the ural region

The possibility is shown for black and brown ceramic decorative coatings to be produced using hornblendite and wastes from the Kachkanar Ore Dressing Factory (mainly diopside) upon addition of CuO, Cr₂O₃, CoO, and B₂O₃. The phase composition of the synthesized materials is given. Translated from Steklo i Keramika, No. 3, pp. 20–21, March, 1997.     

An environment-friendly technology for ceramic materials based on the recovery of industrial wastes

A range of ceramic materials with low sintering temperature have been developed using ceramic and glass wastes (up to 70%). Properties of the newly synthesized materials are given, and areas of application and fabrication methods are discussed.__________Translated from Novye Ogneupory, No. 10, pp. 39 – 41, October, 2004.     

Properties of structural insulation ceramic materials from a mixture of intershale clay and anthracite flotation wastes

The use of anthracite flotation wastes in ceramic masses based on waste fused rock—intershale clay—without the application of traditional natural materials makes it possible to obtain structural insulation materials with thermal conductivity and density of <0.20 W m^?1 K^?1 and 1200 kg/m³, respectively.     

硅橡胶防热涂层隔热与耐热性能研究

本文系统研究了自制DMGQ-2硅橡胶防热涂层的热物理性能。结果表明,固化剂用量对热化学参数无显著影响,热化学参数随温度的变化而变化,通过拟合方程,可以对特定温度下DMGQ-2涂层的导热系数λ、比热容Cp、热扩散系数α进行预估。采用有限元分析,相比于X涂层,DMGQ-2涂层的隔热性能更优。TGA分析了DMGQ-2涂层的热分解温度。200℃热空气老化性能表明,DMGQ-2涂层具有较好的抗热空气老化性能。     

Analysis of the properties of heat insulation materials based on Tatar deposit vermiculite

Development of a new lining material with high chemical and deformation resistance based on vermiculite is described. Properties of the objects obtained are provided that are not surpassed by overseas analogs. This achievement is due to the use of a rational combination of raw material properties and technology regime parameters. In efficiency, material based on vermiculite may replace diatomite materials used traditionally. Use of objects based on vermiculite, having a density lower by a factor of three and lower thermal conductivity by a factor of six instead of traditional heat insulation material, i.e. chamotte, opens the possibility of a reduction in material content. The higher deformation resistance of the material promotes an increase in electrolyzer service life. Therefore, objects based on vermiculite may be used successfully for heat insulation not only in non-ferrous metallurgy installations, but also in thermal power engineering equipment, and in the construction of objects for industrial and domestic purposes. Translated from Novye Ogneupory, No. 3, pp. 5 – 10, March 2009.     

Utilization of coal-enrichment wastes in ceramic production

Research shows that the use of montmorillonite clay and flotation wastes from coal enrichment permits the production of an effective heat insulator: high-performing claydite. Coal-enrichment wastes facilitate the formation of mullite on firing claydite.     

Thermal insulation and antioxidation of vertical graphene oxide-grafted carbon nanofiber aerogels with ceramic coating

In this work, composite aerogels with low thermal conductivity and antioxidation were prepared by introducing graphene oxide (GO) on the carbon nanofibers (CNFs) surface, followed by ceramic coating. CNFs surface-grafted vertical morphology of GO was used as an enhancer to hinder the heat radiation transmission. The introduced shrinkage-resistant ceramic coating was used as an antioxidant barrier for carbon materials. The anti-shrinking ceramic coating was obtained by heat treatment of coating with wrinkle morphology to complete the ceramic transformation. The wrinkle morphology of the coating originated from the gradient crosslinking of the coating before its ceramic transformation. Among them, the gradient crosslinking of the coating could be done by irradiation crosslinking and crosslinker impregnation crosslinking. The thermal insulation and antioxidant of the composite aerogel were jointly investigated. Moreover, the mechanism of CNFs surface grafting GO and the anti-shrinkage mechanism of the coating were systematically discussed. The experimental results showed that the aerogel exhibited excellent thermal insulation and oxidation resistance in a wide range of temperatures. The structural design of the aerogel not only weakened the thermal radiation transmission to the CNFs aerogel but also significantly enhanced the antioxidant.