Abstract
1. It has been established that powders of refractory compounds can be comminuted by ultrasonic treatment. 2. A study of the comminution kinetics of tungsten and refractory compound (TiC, ZrC, SiC, TiB2, ZrB2, and MoSi2) powders demonstrated that the intensity of the process is a maximum during the first 2–5 min and subsequently diminishes, brittle materials being comminuted more effectively than ductile ones (for instance, tungsten). 3. Particle size analysis indicates that a certain powder fraction is particularly susceptible of being comminuted. Hence, to increase the effectiveness of the process, it is best to employ fractions exhibiting the greatest propensity for comminution (for example, the < 14μ fraction in the work described above). 4. During the ultrasonic comminution of both brittle and ductile materials, there is virtually no pickup of impurities (such as iron) from the bath vessel walls. This is of great importance in the milling of pure materials, where no contamination can be tolerated.
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