Re~ac'tories and Industrial Ceramics Vol. 39, ,u 3 -4, 1998 INFORMATION N. V. Pitak I Translated from Ogneupory i "Yekhnicheskaya Keramika, No. 3, p. 37, March, 1998. Original article submitted December 29. 1997. An international scientific-engineering conference "'De- form at I150~ and at 1300- 1400~ the reaction of cor- velopment of Engineering Chemist~ in Ukraine" was held dierite formation attains maximum intensit?. To increase the October 28- 31, 1997 in Kharkov. The conference was at- refractoriness and improve other high-temperature properties tended by scientists and researchers from academies, univer- the mixture is enriched with high-alumina chamotte, which sities, and research institutes, industrial specialists, members diverts the composition from the stoichiometric cordierite of the Ukrainian Chemical Sociew, the state administration of one, but this variant satisfies the requirements on the deve- railway transport of Ukraine, and representatives of scientific loped material with respect to its set of properties; the cor- and engineering organizations. dierite content in the refractories is 30 k_ 35%. About 140 reports were presented at the plenary meeting Interesting results were presented in the report of R R Kri- voruchko, who studied the interrelation of CrzO 3 and TiO, m and seven sections. Reports on the production and use of all basic kinds of refractories were presented in the section "Su- the 1300- 1400~ range and showed that 5- 6% TiO~ dis- solves in chromium oxide, which is accompanied by an in- perhard Materials and Refractories" (headed by V. V. Pri- crease in the interplane distance of its lattice. The solid solu- machenko and N. V. Pitak). The report ofYu. A. Spirin was devoted to the state of the tion contains Ti 3+ and Ti 4+ ions, and the dissolution of TiO~ in Cr203 depends on the partial pressure of oxygen in the me- raw-materials base for the production of magnesia refracto- dium and increases without bound under reducing conditions. ries in Ukraine. Several deposits of talcomagnesites, ser- pentinites, chromites, and bischofites and magnesium salt The report of R. M. Fedoruk was devoted to some prob- lems of shaping silicon carbide refractories for furnaces of waste from chemical enterprises and other sources can be used for organizing the production of refractories upon intro- the ceramics industry. The developed refractories have a high ducing the appropriate process corrections and making the creep resistance and resist oxidation in service. Several reports were devoted to the use of ZrO, in the requisite investments. production of refractories and ceramics. I. G. Shulik pre- V. A. Ustichenko characterized the development of the sented data on the production of structural ceramics from par- manufacturing process for thermally stable mullite-corundum tially stabilized zirconia with MgO admixtures. The obtained refractories based on multiphase mixtures containing corun- materials possess a hi mla ultimate bending strength (500- dum and mullite of different fractions. The obtained refracto- 600 MPa) due to the presence of a metastable tetragonal ries with 90% Al_,O3 possess high parameters that provide a phase of ZrO z. high endurance in linings of induction and electric-steel-melt- A. G. Karaulov devoted his report to the production of ing furnaces, air heaters, crucibles, burner stones for heating refractories from monoclinic ZrO 2 without a stabilizing CaO furnaces, saggers, and some other refractory, parts. admixture but with the use ofAl203 and SiO 2 modifiers. The S. M. Log-vinkov described cordierite-containing materi- developed refractories increase the sen'ice life of linings of als of a new type with a controlled phase composition and a furnaces for melting pure quartz glass by a factor of 6. reaction-formed structure that are based on reversible solid- The use of fiber-bearing refractories in the thnctional phase chemical reactions in the MgO - AIaO 3 - SiO z system. layer of a lining sometimes requires protection of the surface The results of this study make it possible to predict the phase from various operational factors. These problems are solved composition and structure of the developed materials. by using protective coatings of silica gel and liquid glass with To control the phase composition and properties of re- admixtures of mullite and chamotte, which increases the fractories in the MgO - AI,O 3 - SiO 2 system the authors used strength of the material and allows it to operate at 1200~ (re- the special features of reversible chemical reactions typical ported by L. V. Serova). for the subsolidus region of the considered dia~am. L. A. Babkina gave examples of the use of various ram- L. S. Frolova showed in her report that cordierite begins to ming mixtures in linings of furnaces and equipment and showed Ukrainian Research Institute of Refractories. Kharkov, Ukraine. their technological, economic, and environmental efficacy. 1083-a877!9;~/3903-01 ! 2520.00 :C~ ! 098 Plenum Publishing Corr~ravion
Refractories and Industrial Ceramics – Springer Journals
Published: Nov 27, 2007
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