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in publisher: "National Inst. of Standards and Technology MSEL, Gaithersburg, MD United States. Ceramics Div."  
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Equipment for investigation of cryogenic compaction of nanosize silicon nitride powders

Description: This paper describes a system for studies of time-dependent compaction of nanosize silicon nitride powders under various atmospheres at 77 to 1000 K. The system incorporates a screw-driven press (10 ton capacity) with a piston-cylinder type die and can produce cylindrical powder compacts, 3 mm dia and about 1 mm thick, using pressures up to 3 GPa. The system is computer-controlled and permits accurate measurements of the sample volume, and, after appropriate calibration, can determine the rate … more
Date: December 31, 1992
Creator: Chen, Wei; Piermarini, G. J.; Dapkunas, S. J.; Malghan, S. G.; Pechenik, A. & Danforth, S.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Low temperature fabrication from nano-size ceramic powders

Description: The objective of the compaction process is to produce a dense green-state compact from a nanosize powder that subsequently can be sintered at high temperatures to form a dense ceramic piece. High density in the green-state after pressing is of primary importance for achieving high densities after sintering. Investigation of the compaction behavior of ceramic powders, therefore, is an important part of characterization of raw ceramic powders and evaluation of their compaction behavior, analysis … more
Date: June 1, 1995
Creator: Gonzalez, E. J.; Piermarini, G. J. & Hockey, B.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Review of corrosion behavior of ceramic heat exchanger materals: Corrosion characteristics of silicon carbide and silicon nitride. Final report, September 11, 1992--March 11, 1993

Description: The present work is a review of the substantial effort that has been made to measure and understand the effects of corrosion with respect to the properties, performance, and durability of various forms of silicon carbide and silicon nitride. The review encompasses corrosion in diverse environments, usually at temperatures of 1000C or higher. The environments include dry and moist oxygen, mixtures of hot gaseous vapors, molten salts, molten metals, and complex environments pertaining to coal ash… more
Date: September 1, 1993
Creator: Munro, R. G. & Dapkunas, S. J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Low-temperature fabrication of transparent silicon nitride

Description: Feasibility of producing nano-phase Si{sub 3}N{sub 4} with improved properties, and ultrafine-grained nano-phase transparent Si{sub 3}N{sub 4} by working with amorphous nano-size powders without the use of sintering aids was investigated. The approach uses cryogenic compaction of nano-size particles under liquid nitrogen followed by pressureless sintering.
Date: May 31, 1994
Creator: Chen, Wei; Malghan, S. G.; Danforth, S. C. & Pechenik, A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Investigation of the effects of pressure on the compaction and subsequent sintering of nanosize powders. Final report

Description: With current technology and available raw materials, one knows that it is very difficult, if not impossible, to produce a monolithic ceramic material with an average grain size of less than 100 nm. The grains of ceramic materials cannot be refined by cold working as is typically done in metals. Hence, the starting ceramic powder must be of a smaller or similar particle size as the desired grain size for the final product. The availability of nanosize (<100 nm) ceramic powders, however, is limit… more
Date: February 26, 1996
Creator: Gonzalez, E. J.; Piermarini, G. J.; Hockey, B. & Malghan, S. G.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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