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Prominent ceramic raw materials and products manufacturers were surveyed to determine the stcte of the art for alumina ceramic fabrication. This survey emphasized current capabilities and limitations for fabrication of large, high-den?ity, highpurity, complex shapes. Some directions are suggested for future needs and development. r -NOTICE-•ponjoicd by to Uniled Sl,u. Cowmmem. Ne,to, ft, Unl«d S».e, no, to UnHed Sl.K, Dtp.,,™,,, or Energy, nor my of Ihtlr employeei, not any of ftelr ccMiKton, lubconmcon. or ibeb employs,, ml,,•ny w,rr,nly, «preo " imflM, w "", fc ln): infringe privilely owned ri|htt.This report is primarily concerned with the definition of industrial capability for the fabrication of large, high-purity ceramic products in commercial quantities. This information was provided by a survey of ceramic manufacturers which focused on commercial fabrication capabilities for large, high-purity alumina shapes and technologies that can expand current fabrication capabilities.Modern energy production concepts, including thermonuclear fusion, coal gasification,and magnetohydrodynamic systems,require containment materials that resist elevated temperatures, erosion and corrosion, thermal shock, and in some cases, radiation damage. Additional desirable characteristics are electrical insulation, imperviousness to gases,and low creep under stress. Ceramic materials provide several candidates that could, fulfill some or all of these requirements. The additional parameter which raises some significant questions is the fabrication of large, high-density, highpurity, often complex parti. The large sizes suggested include linear dimensions between one and three meters and large curved shape*; such as a cylinder one-half meter in diameter integral to a base plate one meter in diameter. Monolithic parts with these large dimensions are required to test the feasibility of many of the proposed energy systems.Current industrial capabilities and limitations for fabrication of such containment systems were determined by selecting alumina as a material that is commercially manufactured for sufficient applications to represent the state of the art of fabrication of large, high-density, high-purity ceramic shapes. Although there are technologies for fabricating large parts from O.STR.8UT.0N OF THIS DOCUMENT IS

No abstract

This report was prepared as an account of Government sponsored work. Neither the United States, nor the Commission, nor any person acting on behalf of the Commission: A. Makes any warranty or representation, expressed or Implied, with respect to the accuracy, completeness, or usefulness of the information contained In this report, or that the use of any information, apparatus, method, or process disclosed in this report may not infringe privately owned rights; or B. Assumes any liabilities with respect to the use of, or for damag~s. resulting from the use of any information, apparatus, method, or process disclosed in this report. As used in the above, "person acting on behalf of the• Commission" includes any employee or contractor of the Commission, or e~ployee of such contractor, to the extent that such employee or contractor of the Commission, or employee of such contractor prepares, disseminates, or provides access to, any information pursuant to his employment or contract with the Commission, or his employment with such contractor.

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