NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Collections About News Help Login
Back to Results
Method for measuring surface activity of silicon nitride powderAmorphous, alpha-, and beta-Si3N4 powders were activated by vibration ball milling in purified MeOH, and the surface activity of ground powders was determined by the temperature programmed desorption (TPD) method using NH3 gas. The concentration of active sites with a potential energy equivalent to the peak temperature in the spectrum increased was markedly by ball milling the amorphous Si3N4. The alpha- and beta-Si3N4 also had active sites produced by ball milling. The concentration of active site increased with increased ball milling time. A method for measuring surface activity of ceramic raw materials by TPD is proposed.
Document ID
19850026929
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Kanno, Y. (NASA Headquarters Washington, DC United States)
Imai, H. (NASA Headquarters Washington, DC United States)
Date Acquired
September 5, 2013
Publication Date
September 1, 1985
Subject Category
Composite Materials
Report/Patent Number
NASA-TM-77906
NAS 1.15:77906
Accession Number
85N35242
Funding Number(s)
CONTRACT_GRANT: NASW-4004
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

Related Records

There are no records associated with this record.
No Preview Available