Structure and Properties of the Composite Material Obtained by Thermal Explosion of a Mixture of NI + Al + Cr2O3
O. D. Boyarchenko, A. E. Sychev, L. M. Umarov, A. S. Shchukin, I. D. Kovalevov, M. A. Sichinava
Institute of Structural Macrokinetics and Materials Sciences, Chernogolovka, 142432 Russia
Keywords: алюминид никеля, оксид хрома, самораспространяющийся высокотемпературный синтез (СВС), фазообразование, композиционные материалы, nickel aluminide, chromium oxide, self-propagating high-temperature synthesis (SHS), phase formation, composite materials
Abstract
The synthesis of the composite material by thermal explosion of a reaction mixture of Ni + Al + Cr2O3 was studied. The thermodynamic parameters of combustion of the systems studied were estimated to predict the composition of the inorganic products (condensed or gaseous) of self-propagating high-temperature synthesis and calculate the adiabatic combustion temperature. It is shown that the synthesis process involves competing reactions in the sample volume which are responsible for the formation of a multiphase product. The influence of the content of Cr2O3 in the reaction system on the strength characteristics of the product synthesis. The microstructure of the synthesized samples, defined by their micro-hardness, toughness and residual porosity. The possibility of obtaining a homogeneous material based on NiAl intermetallic compound containing dissolved chromium and chromium oxide nanoparticles.
|
