Fine-grain alumina bodies

Abstract

Abstract A CASTING SLIP FOR FINE-GRAIN ALUMINA BODIES INCLUDES ALUMINA, A GRAIN-GROWTH INHIBITOR SUCH AS MAGNESIA, A SOLVENT INCLUDING TRICHLOROETHYLENE AND TETRACHLOROETHYLENE, AND A DEFLOCCULANT SUCH AS MENHADEN OIL. THESE INGREDIENTS ARE MILLED. THEN, A BINDER SUCH AS POLYVINYL BUTYAL RESIN WITH A LOW VISCOSITY AND A LOW HYDROXY CONTENT AND PLASTICIZERS SUCH AS POLYALKYLENE GLYCOL AND PHTHALATE ESTER ARE ADDED TO THESE INGREDIENTS AND THE ENTIRE SLIP IS MIXED. NEXT, THE SLIP IS CAST ONTO A MOVING CARRIER SHEET INTO THE FORM OF A TAPE WHICH IS DRIED, PUNCHED AND FIRED TO FORM FINE-GRAIN ALUMINA BODIES WHICH ARE PARTICULARLY USEFIL AS SUBSTRATES FOR MICROCIRCUITS, INCLUDING THIN FILM AND INTEGRATED CIRCUITS. THE SLIP IS NONFLAMMALBLE AND VAPORS THEREFROM PRODUCE A NONEXPLOSIVE MIXTURE WITH AIR. ALSO, SOLVENTS OF THE TAPE DO NOT EXCESSIVELY ATTACK THE SHEET ONTO WHICH IT IS CAST AND THE CAST TAPE IS ACCORDINGLY VERY FLAT. THE TAPE IS ALSO VERY FLEXIBLE AND EASY TO ROLL UP AND STORE. THE FLAT TAPE, WHEN PUNCHED AND FIRED, PRODUCES FLAT ALUMINA BODIES.

Inventors

• 👤 J Argyle
• 👤 G Medowski
• 👤 D Ports
• 👤 R Sutch
• 👤 P Sutch

Bibliographic Details