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Title: Development of silicon nitride composites with continuous fiber reinforcement

Abstract

The composites were fabricated using ultrafine Si powders prepared by attritor milling; the powders exhibits full conversion to Si nitride in < 3 h at {le} 1200 C (these conditions reduce degradation of the fibers compared to conventional). Effects of processing conditions on fiber properties and the use of fiber coatings to improve stability during processing as well as change the fiber-matrix interfacial properties were investigated. A duplex carbon-silicon carbide coating, deposited by CVD, reduced fiber degradation in processing, and it modified the fiber-matrix adhesion. Si nitride matrix composites were fabricated using reaction sintering, forming laminates, filament-wound plates, and tubes. In each case, an attritor milled Si powder slurry is infiltrated into ceramic fiber preforms or tows, which are then assembled to form a 3-D structure for reaction sintering. The resulting composites have properties comparable to chemical vapor infiltration densified composites, with reasonable strengths and graceful composite fracture behavior.

Authors:
; ; ;  [1]
  1. Georgia Inst. of Tech., Atlanta, GA (United States). Georgia Technology Research Inst.
Publication Date:
Research Org.:
Oak Ridge National Lab., TN (United States); Georgia Inst. of Tech., Atlanta, GA (United States). Georgia Technology Research Inst.
Sponsoring Org.:
USDOE, Washington, DC (United States)
OSTI Identifier:
10192173
Report Number(s):
ORNL/Sub-87-00184/04
ON: DE94001996
DOE Contract Number:  
AC05-84OR21400
Resource Type:
Technical Report
Resource Relation:
Other Information: PBD: Oct 1993
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; SILICON NITRIDES; COMPOSITE MATERIALS; FABRICATION; SILICON; NITRIDATION; REINFORCED MATERIALS; FIBERS; COATINGS; CHEMICAL VAPOR DEPOSITION; CARBON; SILICON CARBIDES; TEXTILES; 360601; PREPARATION AND MANUFACTURE

Citation Formats

Starr, T L, Mohr, D L, Lackey, W J, and Hanigofsky, J A. Development of silicon nitride composites with continuous fiber reinforcement. United States: N. p., 1993. Web. doi:10.2172/10192173.
Starr, T L, Mohr, D L, Lackey, W J, & Hanigofsky, J A. Development of silicon nitride composites with continuous fiber reinforcement. United States. doi:10.2172/10192173.
Starr, T L, Mohr, D L, Lackey, W J, and Hanigofsky, J A. Fri . "Development of silicon nitride composites with continuous fiber reinforcement". United States. doi:10.2172/10192173. https://www.osti.gov/servlets/purl/10192173.
@article{osti_10192173,
title = {Development of silicon nitride composites with continuous fiber reinforcement},
author = {Starr, T L and Mohr, D L and Lackey, W J and Hanigofsky, J A},
abstractNote = {The composites were fabricated using ultrafine Si powders prepared by attritor milling; the powders exhibits full conversion to Si nitride in < 3 h at {le} 1200 C (these conditions reduce degradation of the fibers compared to conventional). Effects of processing conditions on fiber properties and the use of fiber coatings to improve stability during processing as well as change the fiber-matrix interfacial properties were investigated. A duplex carbon-silicon carbide coating, deposited by CVD, reduced fiber degradation in processing, and it modified the fiber-matrix adhesion. Si nitride matrix composites were fabricated using reaction sintering, forming laminates, filament-wound plates, and tubes. In each case, an attritor milled Si powder slurry is infiltrated into ceramic fiber preforms or tows, which are then assembled to form a 3-D structure for reaction sintering. The resulting composites have properties comparable to chemical vapor infiltration densified composites, with reasonable strengths and graceful composite fracture behavior.},
doi = {10.2172/10192173},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1993},
month = {10}
}