Compatibility studies in the Li17Pb83–SiC, Be–SiC and Be–Mo systems

The compatibility of Li17Pb83 with SiC between 600 and 1000 °C, of Be with SiC between 700 and 900 °C and of Be with Mo between 800 and 900 °C was studied isothermally in capsule experiments. About 0.017, 0.035 and <0.05 mass% Si were observed in the Li17Pb83 melt annealed at 600, 800 and 1000 °C, resp. The reaction between Be and SiC is unidirectional and rate-determined by Be diffusion through the product phases Si and Be2C with the chemical diffusion coefficient DBe=3.0·10−5exp(−224 000/RT) m2/s, 1000–1350 K. The lattice parameter of fcc Be2C was found to a=434.9 pm. The reaction between Be and Mo is unidirectional and rate-determined by Be diffusion through the product phases Be12Mo and Be2Mo. The compound BeMo3 was observed only during the 800 °C heat treatment.