It is shown that it is possible in principle to increase the strength of refractory granules by a factor of 1.5 - 2 by applying coatings on them based on silicon-containing compounds at elevated temperatures. It has been established that an increase in strength is achieved to a greater extent when a coating is formed with the structure of fine-crystalline sodium silicate, silicon oxide or glass; the strength of the granules increases with an increase in the thickness of the coating, while the hydrophobicity of the granules increases. Il. 1, bibliography: 1 titles.
The proposals of AI Kulikov on the development of power plants, in which high-modulus silicates are used as fuel, are considered in the scientific press. On the basis of thermodynamic estimates, the conclusion is substantiated that it is impossible to create such installations. Bibliography: 7 titles.
The results of assessing the competitiveness of high-quality tableware decorated by plasma spraying are presented. The features of the methodology for assessing competitiveness are considered. Tab. 5, ill. 1, bibliography: 7 titles.
The reasons for the occurrence of the most common defects in glazing of concrete (reinforced concrete) products are considered, possible ways to eliminate defects are indicated. Tab. 1, bibliography: 5 titles.
The stability of basalt and aluminoborosilicate fibers of different diameters under the influence of an alkaline medium of hydrating cements (concretes) has been investigated. Kinetic dependences of absorption by CaO fibers from a saturated solution of Ca (OH) 2 are given. The general regularities of the change in the tensile strength of the fibers after holding in the specified solution for 3, 6, and 12 months have been revealed. The data obtained can be used to analyze and derive the calculated dependences of the long-term strength of basalt fiber composites based on cement matrices. Tab. 3, ill. 4, bibliography: 1 title.
The results of studies on plasma treatment of nickel (II) oxide and silicate glass are presented. It is shown that argon plasma has weakly reducing properties. Tab. 1, bibliography: 17 titles.
The results of a study of the dispersed composition of muscovite micas and wollastonite, the shape of the particles of which are characterized by significant anisometry, are presented. A simple method of sedimentation analysis is proposed, which makes it possible to quickly, and most importantly, with high accuracy, determine the distribution of particles by their sedimentation diameters. Dependences have been obtained, with the help of which it is possible to calculate the geometric dimensions of the particles of the materials under study. Il. 4, bibliography: 5 titles.
Precipitation from solution synthesized tricalcium phosphate with a Ca: P = 1.5 ratio and a gross composition corresponding to the formula Ca 3 (PO 4 ) 2 * 3H 2 O, which is a hydroxyapatite
with a defective structure and is an extreme member of a series of solid solutions between tricalcium phosphate Ca 3 (PO 4 ) 2 and hydroxyapatite Ca 10 (PO 4 ) 6 (OH) 2 . The state of water in the structure of the product and the features of its dehydration have been studied. The presence of crystallographically nonequivalent water molecules, which cause the stepwise nature of dehydration, has been established. Tab. 2, ill. 2, bibliography: 5 titles.
Data are given on the electroactivation of water and the use of its alkaline fraction - catholyte - in the preparation of liquid sodium silicate in order to accelerate this process and reduce the viscosity of the resulting product. As a result, the rate of silicate cooking increased by 2 times, and the viscosity decreased by 1.5 times. Tab. 2.
