APPLICATIONS OF ULTRASONIC ENERGY. ULTRASONIC CASTING OF CERAMIC AND CERMET SLIPS

Technical Report · Wed Nov 01 04:00:00 EST 1961

OSTI ID:4809406

McKinney, Jr, C D; Tarpley, W B; Gaskins, F H

An investigation of the application of ultrasonic energy to slip casting processes demonstrated several beneficial effects. Ultrasonic activation of plaster molds resulted in increased green strength which made the specimens easier to handle and less subject to distortion, and increased green density (as much as 25%), which resulted in reduced firing shrinkage. Ultrasonic flow promotion permitted casting of slips of high solids content which could not normally be used. Plate-like cross sections, 0.06-in. thick by 24-in. deep, were successfully filled. It was demonstrated that cermet compositions, containing materials of different density and particle-size distributions, do not undergo preferential settling of dense materiaIs during ultrasonic casting. After filling the mold, continued activation led to a 50% improvement in dewatering of the cast specimen. Studies of the mechanism by which slip casting is improved indicated that significant ultrasonic intensity levels are achieved in the various slip compositions. Ultrasonic activation greatly reduced the apparent viscosity of these thixotropic slips, accomplished rapid gas removal from the wetted walls, promoted uniformity in mixed density compositions, and increased the rate of flow of water through the ceramic. (auth)

• Research Organization: Aeroprojects, Inc., West Chester, Penna.
• NSA Number: NSA-16-010483
• OSTI ID: 4809406
• Report Number(s): NYO-9586
• Country of Publication: United States
• Language: English

Related Subjects

ADHESION
CALCIUM SULFATES
CASTING
CERAMICS
CERMETS
DEFORMATION
DEGASSING
DENSITY
DISTRIBUTION
EFFICIENCY
ENERGY
FLUID FLOW
GASES
GRAIN SIZE
GYPSUM
LIQUID FLOW
METALS, CERAMICS, AND OTHER MATERIALS
MIXING
PLASTER OF PARIS
PLATES
REDUCTION
SHRINKAGE
SOLIDS
TENSILE PROPERTIES
THICKNESS
ULTRASONICS
VISCOSITY
VOLUME
WATER