Comparative characteristics of known materials used to increase the durability of steel pipes are given. The efficiency of using glass enamel coatings for corrosion protection is shown. The physical and technological characteristics of the welded frits (water resistance, impact strength, microhardness) are within the limits regulated by GOST 24405-80. Tab. 2, bibliography: 2 titles.
The effect of sodium sulfate on the properties of titanium-containing enamel has been studied. It has been established that the introduction of sodium sulfate into the initial charge during cooking of titanium-containing enamel makes it possible to achieve higher values ??of the whiteness of the coating. Tab. 1, ill. 2, bibliography: 8 titles.
The possibility of obtaining ceramic pigments with diopside and anorthite structures using wollastonite has been investigated. It was found that the use of the gel method promotes the intensification of the processes of synthesis of the crystal structure of anorthite and diopside due to better homogenization and averaging of the components of the charge even at the mixing stage. A positive fact is the successful formation of anorthite and diopside structures at relatively low temperatures - about 1100 ° C, as well as the mineralizing effect of chromophores on the crystallization of these minerals. Tab. 4, ill. 3, bibliography: 2 titles.
The results of a study of transparent glaze coatings synthesized in the system Na 2 O - K 2 O - B 2 O 3 - Al 2 O 3 - SiO 2 , with a mass content of 12.8% B 2 O 3 and 3.9% Al 2 O 3 . The effect of doubly charged modifier cations SrO, MgO, CaO and their combinations on the physicochemical properties and structure of glasses and coatings based on them has been established. The optimal range of compositions of glaze coatings that meet the requirements of standards for the migration of boron and aluminum into food media has been determined. Il. 2, bibliography: 3 titles.
The influence of tin oxide and calcium phosphate additives on the adhesion strength of the material for the manufacture of the ground layer of the artificial tooth and the metal of the crown is considered. An alternative express method for determining the adhesion strength of metal and ceramics using the "Micro Scratch Tester" device was used using the method of drawing a line with a diamond indenter over the finished coating. It was found that the best adhesion is provided by the addition of hydroxyapatite. Tab. 2, ill. 2, bibliography: 3 titles.
The effect of complex additives Na 2 O, Al 2 O 3 and P 2 O 5 on the structure and physicochemical properties of boron-free titanium enamels. It has been established that the introduction of Na 2 O into boronless titanium enamel together with Al 2 O 3 or P 2 O < sub> 5 (in optimal ratios 1: 1 and from 1: 1 to 2: 1, respectively) instead of a part of SiO 2 contributes to the expansion of the "cationic assortment" of network formers in glasses and an increase in their fusibility without reducing the whiteness of enamel coatings obtained on their basis. Tab. 2, ill. 3, bibliography: 4 titles.
Low-melting lead-free glass fluxes for the manufacture of enamels for glass decoration have been developed. Glasses have characteristics: TCLE - (82 ... 85) ?; 10 -7 ° С -1 , chemical resistance to water - less than 0.06% and to a 2% solution of Na 2 CO 3 - less than 0.15%, fusibility - 22 - 28 mm. Il. 5, bibliography: 7 titles.
The possibility of replacing quartz sand when cooking an enamel frit with natural diatomite rock has been investigated. It has been established that the use of local diatomite as a silicate raw material for cooking enamel frits is a promising trend in enameling technology. The properties of frits obtained on the basis of diatomite raw materials are similar to the properties of the reference low-melting frit F-1, have slightly lower cooking and softening temperatures, and their technological characteristics are within the limits regulated by GOST 24405--80 for ground enamels on steel. Tab. 3, bibliography: 1 title.
It has been established that nickel-plated hollow glass microspheres can be used as a conductive and heat-insulating filler for paints and varnishes to obtain coatings on their basis with low values ??of electrical resistance and good heat-insulating properties. Tab. 2, ill. 1, bibliography: 4 titles.
The basic composition of single-layer glass enamel has been developed, which allows obtaining a wide range of colors of coatings for steel products with good surface quality. A number of ionic dyes have been tested, mainly compounds of d- and f-elements. The properties of coatings have been studied: chemical resistance, adhesion strength, gloss and heat resistance. The firing temperature has been determined. The obtained glass enamels can be used in mass production. Tab. 4, bibliography: 3 titles.
