skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Equipment for investigation of cryogenic compaction of nanosize silicon nitride powders

Abstract

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 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 1300 to 1600{degrees}C. Max random packing density of 64% has been obtained using liquid nitrogen lubricant at pressure less than 2.5 GPa. Both green samples and samples sintered at temperatures to 1500{degrees}C were transparent.

Authors:
; ; ;  [1];  [2];  [3]
  1. National Inst. of Standards and Technology (MSEL), Gaithersburg, MD (United States). Ceramics Div.
  2. Air Force Office of Scientific Research, Washington, DC (United States)
  3. Rutgers--the State Univ., Newark, NJ (United States)
Publication Date:
Research Org.:
National Inst. of Standards and Technology (MSEL), Gaithersburg, MD (United States). Ceramics Div.
Sponsoring Org.:
USDOE, Washington, DC (United States)
OSTI Identifier:
10171426
Report Number(s):
DOE/OR/22041-1
ON: DE93018740
DOE Contract Number:  
AI05-92OR22041
Resource Type:
Technical Report
Resource Relation:
Other Information: PBD: [1992]
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; SILICON NITRIDES; COMPACTING; POWDERS; CRYOGENICS; 360201; PREPARATION AND FABRICATION

Citation Formats

Chen, Wei, Piermarini, G J, Dapkunas, S J, Malghan, S G, Pechenik, A, and Danforth, S. Equipment for investigation of cryogenic compaction of nanosize silicon nitride powders. United States: N. p., 1992. Web. doi:10.2172/10171426.
Chen, Wei, Piermarini, G J, Dapkunas, S J, Malghan, S G, Pechenik, A, & Danforth, S. Equipment for investigation of cryogenic compaction of nanosize silicon nitride powders. United States. https://doi.org/10.2172/10171426
Chen, Wei, Piermarini, G J, Dapkunas, S J, Malghan, S G, Pechenik, A, and Danforth, S. 1992. "Equipment for investigation of cryogenic compaction of nanosize silicon nitride powders". United States. https://doi.org/10.2172/10171426. https://www.osti.gov/servlets/purl/10171426.
@article{osti_10171426,
title = {Equipment for investigation of cryogenic compaction of nanosize silicon nitride powders},
author = {Chen, Wei and Piermarini, G J and Dapkunas, S J and Malghan, S G and Pechenik, A and Danforth, S},
abstractNote = {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 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 1300 to 1600{degrees}C. Max random packing density of 64% has been obtained using liquid nitrogen lubricant at pressure less than 2.5 GPa. Both green samples and samples sintered at temperatures to 1500{degrees}C were transparent.},
doi = {10.2172/10171426},
url = {https://www.osti.gov/biblio/10171426}, journal = {},
number = ,
volume = ,
place = {United States},
year = {1992},
month = {12}
}