The color differences of ceramic tiles are considered in relation to the variability of the pattern over time as the stencil wears out. It was found that the degree of wear of the mesh is a factor that significantly affects the indicator of different shades. Comparison of the results of instrumental research of color characteristics of ceramic tiles with the assessment of these characteristics by consumers. There was a significant discrepancy between the expert group's views on the color of ceramic tiles and the results of instrumental studies. Tab. 1, ill. 2, bibliography: 12 titles.
In the mode of self-propagating high-temperature synthesis using solid in-reaction oxidants, unsubstituted and substituted by alkaline earth metals, cerium chromites are synthesized. The characteristic temperatures and features of the processes of interaction of components in all studied systems have been determined. The structural and physicochemical, including spectroscopic, characteristics of the synthesis products were studied depending on the substituting alkaline earth metal and the degree of substitution. Tab. 1, ill. 6, bibliography: 7 titles.
The results of studies of plasma treatment of chromium, titanium and iron oxides are presented. It is shown that oxides of variable valence are partially reduced in argon plasma. Tab. 1, ill. 2, bibliography: 3 titles.
Within the framework of a quasi-static uncoupled problem of thermoelasticity, one-sided heating of a glass or ceramic plate freely clamped along the contour by a surface source is considered. An analytical relationship is obtained, which is a criterion for the thermal strength of a plate and allows one to determine non-destructive processing modes. It is shown that for many materials there is a region of variation of the Fourier number, in which the destruction of the processed plate by thermoelastic stresses is possible. Il. 1, bibliography: 10 titles.
The results of experimental studies on the optimization of the sintering process of bioactive composite materials based on a silicate matrix and hydroxyapatite are presented. To assess and predict the technological, mechanical and biological properties of materials, a sintering index is introduced, which is the ratio of the specific surfaces of the matrix and filler powders. The functional dependence of the sintering index on the content and granulometric composition of the filler was revealed. Sintered composite materials can be used to make intraosseous dental implants. Il. 2, bibliography: 4 titles.
The results of studying a composite material based on synthetic hydroxylapatite reinforced with a glass phase are presented. The resulting material has high strength, sufficient pore size and biochemical solubility, which makes it possible to recommend it for practical use as implants. Tab. 1, bibliography: 6 titles.
The experience of industrial operation of a permanent magnet separator based on Nd - Fe - B EMC design for dry magnetic re-enrichment of quartz sands at a glass plant is considered. The proposed magnetic separator, which has a number of advantages over electromagnetic separators of the EVS series, is advisable to use in the glass batch preparation shop to remove coarse quartz sand and other charge materials, both iron-containing natural mineral components and iron-containing particles introduced during drying, storage and transportation. ... Bibliography: 4 titles.
A method has been developed for predicting changes in the bearing capacity of composites based on cement matrices using various types of glass fibers as reinforcing components. The method can be used in the design of building glass fiber cement structures intended for long-term operation. Tab. 3, ill. 4, bibliography: 17 titles.
The possibilities of using various types of alumina raw materials, modifying additives, temporary technological bonds for the manufacture of bioinert ceramic materials based on aluminum oxide have been investigated. The modes of heat treatment of workpieces have been developed. Received a ceramic material with an average density of 4.01 g / cm 3 , tensile strength at three-point bending 380? 20 MPa, with a corundum crystal size of 4 - 6 microns and zero open porosity, which can be used as heads of hip joint endoprostheses. Tab. 4, bibliography: 3 titles.
The technology of obtaining a building finishing mineral coating based on water glass using dehydrated clay as an active component, the presence of which contributes to an increase in the volume of amorphous calcium hydrosilicates, increasing the absorptive capacity of the coating and excluding the appearance of efflorescence on the surface of painted building facades, is considered. Increased durability, strength and water resistance of the coating are provided by silicatization of sodium water glass with white Portland cement. Il. 2, bibliography: 5 titles.
