VOL 92, No. 11 (2019)

The results of obtaining hollow glass microspheres and their effect on the properties of facade water-dispersion paints and varnishes when replacing titanium oxide and calcium carbonate in the formulation with an equivalent volumetric number of spheres are presented.

The features of the action of focused femtosecond laser pulses on antimony-silicate glass of the composition 25Sb ₂ O ₃ & middot; 75SiO ₂ & # 37; (molar content) in thermal and non-thermal modes. It has been established that, in contrast to quartz glass, alkali silicate and some borosilicate glasses, in the laser-modified regions of the studied glass, there is no shape birefringence characteristic of the formation of nanolattices. When exposed to 106 pulses with an energy of more than 100 nJ and a repetition rate of 10 and 200 kHz, weak birefringence occurs in the modified regions, the slow axis of which is parallel to the plane of polarization of the recording laser beam, accompanied by the precipitation of crystalline phases, which most likely include the cubic modification Sb ₂ O ₃

The structure and phase composition of lanthanum hexaboride ceramic material samples prepared by sintering are investigated. It was found that the formation of a high-quality consolidated structure with closed pores is observed at a sintering temperature of 1850 ° C. It is shown that the addition of nickel intensifies the sintering process and neutralizes the effect of the sintering temperature on the grain size and pore volume fraction. Nickel was found both in the main material of LaB ₆ grains and in the form of fine intermetallic compounds at grain boundaries

The results of the possibility of using dolerite fine-grained waste of crushed stone production in ceramic charges for the manufacture of low-shrinkage products are presented. It was found that solid-phase sintering wastes reduce fire shrinkage in all types of raw materials use. When sintering in the presence of a liquid phase, they perform a reinforcing role in the formation of the structure of a ceramic material and provide products with high physical and mechanical properties.

The composition of the charge based on low-plasticity clay has been developed, which additionally contains (by weight) 6 & # 37; boric acid and up to 10 & # 37; molybdenum trioxide as fluids, facilitating liquid-phase sintering. It was found that the use of molybdenum trioxide also makes it possible to lower the surface tension of the melt and increase the bond strength between the crystalline and glassy phases in the bulk of the ceramic. The combined effect of the applied additives on the formation of the structure, composition, and main operational properties of the resulting ceramics has been investigated. Molybdenum-containing ceramics was obtained that meets the regulatory requirements for products for external cladding of walls and plinths of buildings and structures.

Using the method of self-propagating high-temperature synthesis (SHS), porous metal-ceramic membranes based on a mixture of powders of aluminum oxide, silicon carbide, and magnesium oxide have been obtained. The membranes obtained are catalytically active, the surfaces of open pores in them are modified with rhenium-tungsten active components using the alkoxo method. At a temperature of 600 & # 176; C, the highest selectivity to propylene (& # 8776; 60 & # 37;) is achieved. In this case, the optimal conditions for the implementation of the propane dehydrogenation process is a temperature of 650 ° C, at which a fairly high selectivity for the most important monomers is maintained with a relatively small proportion of side processes

The processes of melting of various types of igneous rocks that make up gabbro-basalt raw materials are considered. The role of the main rock-forming elements in the formation of these melts for the production of mineral fibers and petrurgy products is shown. Particular attention is paid to their influence on the viscosity and crystallization ability of industrial melts, as well as iron - the only element present in two oxidation states Fe (II) and Fe (III), which can participate, respectively, in the isomorphism of Mg and Al. Information on the influence of the ratio of these oxides on the crystallization of mineral fibers of stone casting products is given.

The results of tests in laboratory and production conditions of the developed heat-resistant sitall coatings for the protection of expensive nichrome alloys based on technogenic raw materials are presented. The results of the economic efficiency of the application of the developed heat-resistant sitall coatings with the use of secondary raw materials during the operation of coatings at high temperatures are presented.

Maria Ivanovna Timokhova was born on December 5, 1924 in the village. Algasovo, Tambov region In 1936 the family moved to Moscow. In 1941, M.I. Timokhova graduated from the 9th grade of secondary school. During the Great Patriotic War, at the beginning of 1942, she was drafted into the ranks of the Soviet army, into the troops of the Moscow Defense Ministry, and into a medical and sanitary company. Demobilized in September 1945, MI Timokhova returned to finish her studies in the 10th grade of the school and then entered the Moscow Institute of Chemical Technology. DI Mendeleev at the silicate faculty.
After graduating from the institute, MI Timokhova was assigned to the All-Union Scientific Research Institute of Electroceramics (VNIIEK) as a technologist of ceramic production.
Maria Ivanovna Timokhova's entire career for 40 years has been focused on the development and improvement of new technologies in the field of ceramics. MI Timokhova - candidate of technical sciences. She has published 150 scientific papers.
Maria Ivanovna is a participant of three jubilee military Victory Parades on Red Square. And we wish her strength and health to take part in the Parade, which will be dedicated to the 75th anniversary of the Great Victory.
The whole life of Maria Ivanovna is a high example of love and service to her Fatherland!