MULTIFUNCTIONAL CHARGES FOR OBTAINING PROTECTIVE COATINGS ON PRESSING EQUIPMENT UNDER SHS CONDITIONS
Abstract
Multifunctional SHS charges for the production of chrome coatings alloyed with titanium and silicon have been developed in this work in order to strengthen the working surfaces of press tooling dies used in aggressive conditions during the vulcanization of products made of elastomeric materials. Pressing is performed on a hydraulic vulcanizing press 100-400 2E. with plate sizes 400x400 of new elastomeric materials based on 10 wt.% carbonized PAN fiber (RC Helper), which significantly increases the heat capacity of rubber based on a copolymer of vinyl di-fluoride and hexopropylene by 15-30% in the operating temperature range from 323 to 348 K. One of the newest and most effective technologies for manufacturing a wide range of materials, including composite materials, is the SHS technology, which is based on the direct synthesis of compounds of practical value in exothermic reactions between certain chemical elements. Protective coatings on samples under SHS conditions were obtained at the developed pilot plant DSTU12, which consists of the following main functional systems: reaction equipment; system for monitoring and controlling technological parameters; gas utilization system. Samples from 45 and 40X steels were used for coating. Mixtures of powders with a dispersion of 100-250 microns of the following materials were used as reaction agents. Using a three-factor, three-level composite asymmetric plan of the second order, the optimal blends for obtaining protective alloy coatings were developed. The resulting coatings are characterized by a multiphase structure and thickness uniformity. For titanium-doped chromium coatings obtained on samples from steel 45, the phases (Cr,Fe)₂₃C₆, (Cr,Fe)₇C₃, Fe₂Ti, Cr₂Ti, and α-solid solution of titanium and chromium in α-iron were found. For 40X steel, the phases (Cr,Fe)₂₃C₆ and α-solid solution of chromium in iron with Cr₂Ti inclusions alloyed with titanium are formed.
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