Abstract
For the purpose of the shear test free of friction between a powder and a cell wall, at a high temperature, a direct shear tester with two parallel plates and electric heaters has been developed. The performance of the tester has been evaluated, and the effect of temperature on the powder yield locus has been investigated. The reproducibility of experimental data obtained by this tester is satisfactory, and the experimental procedure at a high temperature as well as at room temperature is simple. The results of the shear test at various temperatures show that the friction coefficient of powder decreases, and the cohesion of powder increases with increasing temperature.
