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Title: Cryogenic compaction of nanosize silicon nitride powders

Abstract

This paper describes a highly-specialized system for studies of time-dependent compaction of nanosize silicon nitride powders under a variety of atmospheres and at temperatures ranging from 77 to 1,000 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 in diameter and approximately 1 mm in thickness, using pressures measurements of the sample volume, and, after appropriate calibration, can determine the rate and degree of densification of the compacting powder as pressure is applied. Frictional forces between the piston and the die are measured during the compaction process. For calibration of the system, powders with known volume-change accompanied by phase transition under pressure were studied, and good agreement with published results was demonstrated. Several Si{sub 3}N{sub 4} samples have been compacted and sintered at 1,300 to 1,600{degrees}C. A maximum random packing density of 64% has been obtained using liquid nitrogen as a lubricant medium at pressures lower than 2.5 GPa. Both green samples and samples sintered at temperatures to 1,500{degrees}C exhibited visual transparency under visible light.

Authors:
; ; ;  [1];  [2];  [3]
  1. National Institute of Standards and Technology, Gaithersburg, MD (United States)
  2. Air Force Office of Scientific Research, Washington, DC (United States)
  3. Rutgers Univ., Newark, NJ (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
OSTI Identifier:
140118
Report Number(s):
ORNL/FMP-93/1; CONF-9305135-
ON: DE94001091; TRN: 93:003927-0012
Resource Type:
Conference
Resource Relation:
Conference: 7. annual conference on fossil energy materials, Oak Ridge, TN (United States), 11-13 May 1993; Other Information: PBD: Jul 1993; Related Information: Is Part Of Proceedings of the Seventh Annual Conference on Fossil Energy Materials; Fossil Energy AR and TD Materials Program; Cole, N.C.; Judkins, R.R. [comps.]; PB: 402 p.
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; SILICON NITRIDES; COMPACTING; FABRICATION; POWDERS; CRYOGENICS; DESIGN; COMPUTERIZED CONTROL SYSTEMS; SINTERING; DENSITY

Citation Formats

Chen, W, Piermarini, G J, Dapkunas, S J, Malghan, S G, Pechenik, A, and Danforth, S. Cryogenic compaction of nanosize silicon nitride powders. United States: N. p., 1993. Web.
Chen, W, Piermarini, G J, Dapkunas, S J, Malghan, S G, Pechenik, A, & Danforth, S. Cryogenic compaction of nanosize silicon nitride powders. United States.
Chen, W, Piermarini, G J, Dapkunas, S J, Malghan, S G, Pechenik, A, and Danforth, S. 1993. "Cryogenic compaction of nanosize silicon nitride powders". United States.
@article{osti_140118,
title = {Cryogenic compaction of nanosize silicon nitride powders},
author = {Chen, W and Piermarini, G J and Dapkunas, S J and Malghan, S G and Pechenik, A and Danforth, S},
abstractNote = {This paper describes a highly-specialized system for studies of time-dependent compaction of nanosize silicon nitride powders under a variety of atmospheres and at temperatures ranging from 77 to 1,000 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 in diameter and approximately 1 mm in thickness, using pressures measurements of the sample volume, and, after appropriate calibration, can determine the rate and degree of densification of the compacting powder as pressure is applied. Frictional forces between the piston and the die are measured during the compaction process. For calibration of the system, powders with known volume-change accompanied by phase transition under pressure were studied, and good agreement with published results was demonstrated. Several Si{sub 3}N{sub 4} samples have been compacted and sintered at 1,300 to 1,600{degrees}C. A maximum random packing density of 64% has been obtained using liquid nitrogen as a lubricant medium at pressures lower than 2.5 GPa. Both green samples and samples sintered at temperatures to 1,500{degrees}C exhibited visual transparency under visible light.},
doi = {},
url = {https://www.osti.gov/biblio/140118}, journal = {},
number = ,
volume = ,
place = {United States},
year = {1993},
month = {7}
}

Conference:
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