Sosuke Uchida

Dissolution of solid antimony in molten bismuth under static conditions

The dissolution of solid antimony in molten bismuth was studied under static and isothermal conditions using the reaction couple and immersion methods between 623 and 773 K. The dissolution of antimony under the antimony upper position, using reaction couple method, was governed by diffusion, and the diffusion coefficient of antimony in molten bismuth was obtained as follows:DL = 2.08 X 10-8exp(-ll kJ mol-1/RT), (m2/s). The dissolution of antimony under the immersed condition was governed by the natural convection resulting from the density difference in the melt, and the dissolving antimony was distributed uniformly by natural convection in molten bismuth. The apparent activation energy for the dissolution of solid antimony in molten bismuth was the same as that for the diffusion of antimony in the melt.

Gas sulphonitriding steels in a CS2 and NH3 atmosphere

Abstract The structure and wear resistance of steels treated in a gas sulphonitriding atmosphere, which contained NH 3 and 0.006% CS 2 in endothermically derived propane carrier gas, was investigated. The sulphonitrided layers offer favourable wear resistance relative to untreated steels.