Search academic texts

Information × Registration Number 0215U001523, 0115U002211 , R & D reports Title The study of the formation of ultra disperse particles of high purity WC when interacting the volatile hydroxide WO2(OH)2 with the methane-hydrogen carburizer popup.stage_title Head Novikov N.V., Registration Date 05-03-2015 Organization V.Bakul Institute for Superhard Materials popup.description2 Experimental investigations of the optimization of gas transport streams allowed to produce a quartz reactor in which the reaction space is divided into the evaporation chamber and the chamber WO3 recovery-carburizing volatile tungsten-containing compounds. Chambers separated by a nozzle with an inner diameter of 5 mm, an inner diameter of the reactor of 32 mm, the length of the working zone (T = 1100 ° C) to 600 mm. Processes evaporation-recovery carburization must be separated from each other. The optimal method of supplying a reducing gas-karbidizatora - it is countercurrent to the direction of feed motion of conveyor gas, and reducing gas to be supplied carburizer-axis perpendicular to the gas flow through the conveyor system of equidistant holes of diameter not exceeding 0.8 mm. This scheme provides uniform distribution of gas-reducing agent karbidizatora by volume. Recovery processes, carburizing steam flow WO2 (OH) 2 + H2O can occur both in the open (1) and partially restricted (2) reduction of volume of the chamber-carburizing. And in the first embodiment, the particles can be transported over a considerable distance, and the second practically do not go beyond it. Obtained nano fibers randomly oriented carbide WC thickness <100 nm and spheroids consisting of nano particle size <200 nm. The fibers obtained in an open system while the particles - in partially restricted. Thermodynamic calculations have shown that is possible to obtain particles of carbide without free carbon in medium + methane steam (to be precise regulation costs of methane, water vapor, gas conveyor) and a methane-hydrogen atmosphere saturated with water vapor. Alignment composition, both in carbon and oxygen can be made low-temperature annealing (700-800 ° C) in water in an open system. Product Description popup.authors І.К. Панна І.О. Гнатенко В.П. Бондаренко Л.В. Кошіль М.В. Новіков М.В. Ткач О.В. Галков О.О. Матвійчук П. П. Іценко Р.О. Бусленко popup.nrat_date 2020-04-02 Close