Investigation of phase boundaries in composition materials based on Nb–Si eutectics reinforced by monocrystal fibers of α-Al2O3 with Mo coating B. V. Shchetanov, I. Yu. Efimockin, V. V. Dmitrieva, T. M. Shcheglova Inorganic Materials Applied Research, 2017 Interaction of the Nb–Si–Ti matrix and monocrystalline fibers of α-Al2O3 with barrier Mo coating at the phase boundaries matrix–coating–fiber is investigated. It is determined that the bending strength at 1300°C of the composition material reinforced by fibers with coating is two times higher than that of the matrix and higher than that of the composition material reinforced by fibers without coating by 50%.
Study of NbSi composites reinforced by single-crystal fibers of α-Al2O3 with and without interfacial coating B. V. Shchetanov, I. U. Yefimochkin, V. V. Murashyova, T. M. Shcheglova Inorganic Materials Applied Research, 2016 The interaction between the Nb–Si–Ti matrix and single-crystal α-Al2O3 fibers with and without the interfacial coating on interphase boundaries is studied: fiber–coating–matrix and fiber–matrix. It is established that at 1300°C the bending strength of the composite material reinforced by fibers without coating is 1.5 times higher than that of the matrix, and the bending strength of the material reinforced by fibers with coating is 2.5 times higher.
Study of the effect of composition on the microstructure and thermophysical properties of niobium-based refractory systems V. V. Murasheva, Yu. V. Loshchinin, T. M. Shcheglova, S. I. Pakhomkin, M. G. Razmakhov, F. N. Karachevtsev, I. Yu. Efimochkin, B. V. Shchetanov, N. P. Burkovskaya, N. V. Sevostyanov Inorganic Materials Applied Research, 2016 The structure and thermophysical properties—thermal diffusivity, thermal conductivity, linear thermal expansion coefficient, and specific heat capacity—in a temperature range of 20–1400°C are studied; DSC analysis of Nb–Si composites containing 12–18 and 14 at % Si, which are prepared by hybrid spark plasma sintering and hot pressing, respectively, is conducted. The effect of the composition and temperature on the structure and characteristics of thermophysical properties is estimated.
