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1.
2.
The effect of modifying additives on sintering, microstructure control, and the properties of ceramics was demonstrated. The types of additives with a different type of reaction with the crystal lattice of the basic oxide in sintering were examined. Oxides that form solid solutions are the most effective additives that significantly affect sintering and microstructure formation processes. 相似文献
3.
It is shown that the degree of aggregation of powders and the properties of aggregates (size, strength, porosity) affect the degree of sintering and the microstructure characteristics of the ceramic fabricated. The conditions for obtaining low-aggregation powder and methods for de-aggregating powder are examined. The requirements which powders must satisfy in order to obtain compacts with a uniform pore size and uniform sintering over the volume of the articles are formulated. 相似文献
4.
V. S. Bakunov 《Refractories and Industrial Ceramics》1994,35(6):177-183
High-temperature creep curves of samples of refractory ceramics are considered. It is shown that in the vast majority of cases strain in samples accumulates linearly. Regularities of creep flow rate change under the effect of temperature and loads are established. The sample structure is shown to affect the creep kinetics.Translated from Ogneupory, No. 6, pp. 2–8, June, 1994. 相似文献
5.
Contamination of waters of lake–river systems after many-year migration of 137Cs in water bodies was studied. In lakes with the 137Cs fallout density lower than 8 kBq m–2, the radionuclide concentrations in water after 24–29 years did not exceed 2–3 Bq m–3, and at a fallout level of 37 kBq m–2 it was in the range 11–34 Bq m–3. The natural half-clearance time Т of lake waters from 137Cs was 6–7 years at the exposure of up to 20 years. The 137Cs migration in the lake–river systems that occurred during ~30 years did not lead to structural changes in the water contamination: The initially low 137Cs level in lake waters did not become high, and vice versa. Among rivers feeding Lake Ladoga, the 137Cs level in the Vuoksa River is ~3 times higher than in waters of the Volkhov and Svir rivers. During the period 1988–2015, 21.3 TBq of 137Cs was supplied to Lake Ladoga with Vuoksa waters. The Vuoksa source from the Saima lake system with increased contamination with 137Cs of Chernobyl origin leads to long-term supply of this radionuclide to Lake Ladoga. 相似文献
6.
Deformation tests have been made on hardened cements. A difference from unhardened ones, which show considerable plastic (viscous)
deformation, is that the hardened ones show mainly elastic strain with a small inelastic component at a temperature exceeding
the preliminary heat treatment value.
__________
Translated from Novye Ogneupory, No. 3, pp. 139–143, March, 2007.
Continuation: start in Nos. 1 and 2 for 2007. 相似文献
7.
Results of a study of deformation due to heating and of creep of phosphate materials are presented. The range of necessary
loads and the rate of temperature growth under nonisothermal conditions are determined. The role of the grain composition
of the filler (α-Al2O3) of the model alumophosphate cement composition is shown.
__________
Translated from Novye Ogneupory, No. 4, pp. 30–35, April, 2007. 相似文献
8.
9.
V. S. Bakunov 《Refractories and Industrial Ceramics》1994,35(10):317-321
Results on high-temperature creep in porous ceramics and refractories obtained for model specimens are presented. The role of the shape, size, and number of pores and the effect of some manufacturing parameters (grain composition of the charge and compaction pressure) are discussed. It is established that the deformation rate is independent of the shape and size of the pores and is determined by the porosity and the degree of development of interparticle contacts.Translated from Ogneupory, No. 10, pp. 2–6, October, 1994. 相似文献
10.
V. S. Bakunov 《Refractories and Industrial Ceramics》1994,35(9):277-283
High-temperature creep in densely sintered multiphase ceramics is considered. The presence of other phases, namely, crystalline and glassy, is shown to affect the behavior of specimens. Data on creep during phase transitions in the materials are presented.Translated from Ogneupory, No. 9, pp. 2–8, September, 1994. 相似文献