NDLI: Nonaqueous slip casting of high temperature ceramic superconductors using an investment casting technique

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Nonaqueous slip casting of high temperature ceramic superconductors using an investment casting technique

Content Provider	NASA Technical Reports Server (NTRS)
Organization	The National Aeronautics and Space Administration (NASA)
Copyright Year	1993
Description	A process for slip casting ceramic articles that does not employ parting agents and affords the casting of complete, detailed, precision articles that do not possess parting lines is presented. This process is especially useful for high temperature superconductors and water-sensitive ceramics. A wax pattern for a shell mold is provided, and an aqueous mixture of a calcium sulfate-bonded investment material is applied as a coating to the wax pattern. The coated wax pattern is then dried, followed by curing to vaporize the wax pattern and leave a shell mold of the calcium sulfate-bonded investment material. The shell mold is cooled to room temperature, and a ceramic slip, created by dispersing a ceramic powder in an organic liquid, is poured therein. After a ceramic shell of desired thickness or a solid article has set up in the shell mold, excess ceramic slip is poured out. The shell mold is misted with water and peeled away from the ceramic article, after which the ceramic is fired to provide a complete, detailed, precision, high temperature superconductive ceramic article without parting lines. The casting technique may take place in the presence of a magnetic field to orient the ceramic powders during the casting process.
File Size	325312
File Format	PDF
Alternate Webpage(s)	http://www.archive.org/details/nasa_techdoc_19940011408
Archival Resource Key	ark:/13960/t53f5n156
Language	English
Publisher Date	1993-08-16
Publisher Institution	Langley Research Center
Access Restriction	Open
Subject Keyword	Earth Orientation Geocentric Coordinates Global Positioning System Tracking Stations Deep Space Earth Rotation Temporal Resolution Tracking (position) Universal Time Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Patent

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