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AN INVESTIGATION OF THE STRUCTURE AND PHASE COMPOSITION OF A SILICOON DIFFUSION COATING FOR NIOBIUM
FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OH
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An investigation was made of the structure and phase composition of technical Nb saturated with solid phase Si for 30 min to 15 hrs at temperatures of 1100 to 1300 C. The diffusion coating was analyzed by metallographic analysis and radiographic procedures, and an x-ray spectrum analysis was made. The microhardness was 1050 kgsq mm. The weight gain increased exponentially as it was exposed to higher temperatures and greater duration of the saturation process. The parameters of diffusion of Si into Nb were computed. At saturation temperatures of up to 1300 C, phases of the following composition were developed on the surface of Nb NbSi2, Nb5Si3, and Nb4Si.
APPROVED FOR PUBLIC RELEASE