NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
The Effect of Polymer Char on Nitridation Kinetics of SiliconEffects of polymer char on nitridation kinetics of attrition milled silicon powder have been investigated from 1200 to 1350 C. Results indicate that at and above 1250 C, the silicon compacts containing 3.5 wt percent polymer char were fully converted to Si3N4 after 24 hr exposure in nitrogen. In contrast, the silicon compacts without polymer char could not be fully converted to Si3N4 at 1350 C under similar exposure conditions. At 1250 and 1350 C, the silicon compacts with polymer char showed faster nitridation kinetics than those without the polymer char. As the polymer char content is increased, the amount of SiC in the nitrided material is also increased. By adding small amounts (approx. 2.5 wt percent) of NiO, the silicon compacts containing polymer char can be completely nitrided at 1200 C. The probable mechanism for the accelerated nitridation of silicon containing polymer char is discussed.
Document ID
19950005175
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Chan, Rickmond C.
(NASA Lewis Research Center Cleveland, OH, United States)
Bhatt, Ramakrishna T.
(NASA Lewis Research Center Cleveland, OH, United States)
Date Acquired
September 6, 2013
Publication Date
July 1, 1994
Subject Category
Nonmetallic Materials
Report/Patent Number
E-8981
AD-A291295
NAS 1.15:106664
NASA-TM-106664
ARL-MR-139
Meeting Information
Meeting: Conference on Composites, Materials, and Structures
Location: Cocoa Beach, FL
Country: United States
Start Date: January 10, 1993
End Date: January 15, 1993
Accession Number
95N11588
Funding Number(s)
PROJECT: DA PROJ. 1L1-62211-A-47-A
PROJECT: RTOP 505-63-12
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
No Preview Available