Published in Refractories and Industrial Ceramics
Results are provided for a study of the structure and composition of composites based on red-burning kaolinite clay and calcium carbonate heat treated at 500°C during acid activation. It is shown that during reaction with 12% H2SO4 there is leaching of iron and aluminum ions and formation of calcium sulfate with retention of the kaolinite structure...
Published in Refractories and Industrial Ceramics
Results are provided for refractory materials developed on basis of both secondary resources (broken chamotte refractory, mullite-containing waste, and aluminum melting slag), fireclay, and phosphoric acid. A relationship is established for physicochemical and strength properties of the materials on additive content, filler fractional composition, ...
Published in Refractories and Industrial Ceramics
The effect of annealing and sintering temperature on phase transformation of ZrO2 is studied in relation to REE concentrate content using differential thermal analysis, Raman spectroscopy and x-ray diffraction. It is shown that introduction of REE concentrate in an amount of more than 15 wt.% stabilizes ZrO2 tetragonal phase solely at below 1200 °C...
Published in Refractories and Industrial Ceramics
It was shown that fusion-cast chromium-bearing refractories are the most promising when used as the lining material when designing the next generation glass-making electric furnaces and small-sized melters. To ensure a long-term (up to 10 years) service life of the furnace, its elements (e.g., melting tank wall sections at the liquid glass level, p...
Published in Refractories and Industrial Ceramics
The following Acknowledgement is to be added to page 423 after the Conclusion: The work was financially supported by the Ministry of Education and Science of the RF under a State Task for Scientific Activity, Project No. 9.1372.2017/4.6.
Published in Refractories and Industrial Ceramics
A slip casting method was used to produce samples of BeO-based composite ceramics with additions of 5 – 30 wt.% of nanocrystalline TiO2 powder. It was established that slip casting does not provide the maximum density of ceramic samples. This may cause some effect on its thermophysical properties. A microstructure of (BeO + TiO2)-ceramics was studi...
Published in Refractories and Industrial Ceramics
The possibility of obtaining a porous ceramic composite with a low heat conductivity and high heat reflecting ability based on a mixture of raw materials including potassium polytitanate and different silicon oxide modifications is investigated. It is shown that the introduction of silicon oxide favors the formation of the potassium silicate glass ...
Published in Refractories and Industrial Ceramics
Features of the effect of sintering temperature, pressure and duration of isothermal exposure during spark plasma sintering on the structure of Al2O3 ceramics without activating additives are determined. The correlation revealed makes it possible to determine the direction for finding optimum parameters of a sintering regime and to formulate the pr...
Published in Refractories and Industrial Ceramics
The reliability of an industrial frequency crucible (IFC) induction furnace, used in casting manufacture, depends on its lining life. For this reason quartzite as the cheapest acid lining material is the subject of considerable research work both in our country and overseas. The aim of the present research is development of manufacturing technology...
Published in Refractories and Industrial Ceramics
We perform the experimental investigation of the influence of arrangement of blanks made of oxide ceramics in the chambers of sandblasting installations on the morphology of processed surfaces. Based on the results of mathematical modeling, we propose a mechanism that describes the formation of the surface morphology of ceramic blanks with regard f...
