HYDRODYNAMICS OF MOULDING OF CERAMIC ARTICLES FROM BERYLLIUM OXIDE USING ULTRASONIC ACTIVATION

摘要

Moulding of thermoplastic slurry using ultrasound activation is studied experimentally. Thermoplastic slurry represents a high-viscous suspense of beryllium oxide powder and molten paraffin (with surfactant species) as a binder. Experimental results of slurry products reveal its low castability at minimal binder content. Thus, the actual problem is to increase slurry castability by ultrasound at minimal binder content. The role of bubble cavitations in slurry degassing process is discussed and parameters of ultrasound radiator necessary for cavitation onset in water are found. Consolidation of slurry in wire die is simulated, slurry velocity and temperature profiles are found and analyzed.