Abstract
In order to reduce the cost of the thick-film technology of microcircuits and heating elements, as well as to expand its areas of use, it became necessary to expand the range of materials that, along with ceramics and steel, can also be used as substrates for these products. One of these advanced materials is aluminum. Electrically insulated coatings on metals are subjected to repeated heating and cooling while their produce and use, which promotes the creation of temperature stresses in the coating and leads to their chipping. Therefore, in order to improve the water resistance and adhesion strength of electrical insulation coatings on aluminum, CuO, ZrO2 and Bi2O3 additives were examined. There was found an increase in water resistance with a simultaneous increase in the adhesion strength of the enamel coating with an aluminum substrate with the addition of not more than 3 pts. wt. of copper oxide (II), up to 1 pts. wt. of zirconium oxide (IV), and up to 4 pts. wt. of bismuth oxide (III) w.r.t. 100 pts. wt. of glass.
Highlights
The basis of modern technical progress is the development of chemical compositions and technological parameters for obtaining new glass enamel coatings for various metal substrates [1]
melting temperature (MT) of glass on the content of additives of these oxides in its composition. It has been established (Fig. 1, a) that the addition of zirconium dioxide and copper oxide additives into the composition of this glass contributed to an increase in water resistance, which was characterized by a decrease in the amount of 0.01 N HCl solution, which was used for aqueous extract titration, from 3.55 to 1.10 ml (4/98 dimming class)
It should be noted that CuO additives contributed to an increase in electrical resistivity from 109.8 to 1010.5 Ω∙cm and did not affect the temperature coefficient of linear expansion (TCLE) of the enamel (165∙10-7 K-1), while the addition of ZrO2, on the contrary, contributed to a slight decrease of TCLE to 155∙10-7 K-1, and the value of electrical resistivity did not change (Fig. 2-3, a)
Summary
For the synthesis of glass under research were used quartz sand and soda of technical purity; lithium, potassium, strontium, barium carbonates, titanium dioxide and trisodium phosphate of pure grade; boric acid, oxides of zinc, copper (II) and zirconium (IV) of analytical grade, as well as bismuth (III) oxide of extrapure grade. Glass melting was carried out in fireclay crucibles in an electric furnace with carborundum heaters with an exposure time of 30-40 minutes at a temperature of 115011800С. The readiness of the glass is determined by the visual test of the thread. Melts of glass under research were granulated by pouring into cold water. To determine the physicochemical properties of the glass, samples were made from glass bubble-free metal by casting into steel molds. Experimental studies of the properties of the glass were performed using standard methods and measuring instruments that were generally recognized and widely used in glass chemistry and technology:
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