Study of the phase composition of silicide coatings, based on layered Nb-Mo structures, obtained by vacuum-arc deposition

23rd International Conference on Vacuum Technique and Technology

Lozovan, A.A.^1 ; Betsofen, S.Ya.^1 ; Lenkovets, A.S.^2

Moscow Aviation Institute, National Research University, Ul. Orshanskaya 3, Moscow

121552, Russia^1

JSC Komposit, Moskovskaya obl., Korolev

141070, Russia^2

关键词: Alternating layers;    Body centered cubic lattices;    Layer by layer;    Linear thermal expansion coefficients;    Multilayer composite;    Number of layers;    Silicide coating;    Vacuum arc deposition;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/729/1/012020/pdf
DOI  :  10.1088/1742-6596/729/1/012020

来源: IOP

【 摘 要 】

A multilayer composite ∼1000 μm in thickness, formed by niobium and molybdenum layers (number of layers n = 230), is obtained by vacuum-arc deposition with subsequent siliconization of the surface layers at a temperature of 1200 °C. Layer-by-layer phase analysis is performed by X-ray diffraction and scanning electron microscopy. It is found that in the surface layers ∼130 μm in thickness, single-phase silicides (NbxMo1-x)Si2are formed with the hexagonal C40 structure (Strukturbericht designations). Alternating layers of solid solutions based on niobium and molybdenum with a body-centered cubic (BCC) lattice are observed within the composite. The formation of solid solutions caused by heating of the coating leads to convergence of the values of the linear thermal expansion coefficient and Young's modulus at the interface between the layers.