Process for manufacturing ceramic tubes
July 13, 2010. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 2768277 2948919 3744946 Production of ଲ-alumina ceramic tubes Process for producing sintered silicon carbide ceramic body Composition and process for injection molding ceramic materials Sintered alpha silicon carbide ceramic body having equiaxed microstructure Ceramic composition suited to be injection molded and sintered Plant for producing fired brick blanks Process for injection molding sinterable carbide ceramic materials InventorsAssigneeApplicationNo. 524264 filed on 07/09/1990US Classes:264/634, Shaping by extrusion (e.g., spinning, etc.)264/102, To degas or prevent gas entrapment264/150, Extruding hollow product264/177.11, Nonresinous material only (e.g., ceramic, soap, cellulose, glue, etc.)264/211.11Nonresinous material only (e.g., ceramic, soap, cellulose, etc.)ExaminersPrimary: Derrington, JamesAttorney, Agent or FirmInternational ClassC04B 035/64AbstractCeramic tubes are manufactured from a mixture that includes ceramic powder. The mixture is extruded through a die to form a tube. The tube is passed through an open-ended dryer, calciner, transition zone, sintering furnace, and cooler. Thereafter, the tube is cut to the desired length (which may be very long). The quality of the tube is enhanced by applying a vacuum to the mixture prior to extrusion. For tubes made of non-oxide ceramics, an inert atmosphere is maintained both inside and outside the tube in all sections of the equipment that operate above 200° C. A controlled tension is applied to the tube by means of first pinch rolls disposed downstream of the dryer and second pinch rolls disposed downstream of the cooler. | |
