NDLI: Sialons as high temperature insulators

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Sialons as high temperature insulators

Content Provider	NASA Technical Reports Server (NTRS)
Author	Phillips, W. M. Kuo, Y. S.
Copyright Year	1978
Description	Sialons were evaluated for application as high temperature electrical insulators in contact with molybdenum and tungsten components in hard vacuum applications. Both D.C. and variable frequency A.C. resistivity data indicate the sialons to have electrical resistivity similar to common oxide in the 1000 C or higher range. Metallographic evaluations indicate good bonding of the type 15R ALN polytype to molybdenum and tungsten. The beta prime or modified silicon nitride phase was unacceptable in terms of vacuum stability. Additives effect on electrical resistivity. Similar resistivity decreases were produced by additions of molybdenum or tungsten to form cermets. The use of hot pressing at 1800 C with ALN, Al2 O3 and Si3N4 starting powders produced a better product than did a combination of SiO2 and AIN staring powders. It was indicated that sialons will be suitable insulators in the 1600K range in contact with molybdenum or tungsten if they are produced as a pure ceramic and subsequently bonded to the metal components at temperatures in the 1600K range.
File Size	5486981
Page Count	30
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19790004989
Archival Resource Key	ark:/13960/t1jh8c00s
Language	English
Publisher Date	1978-12-01
Access Restriction	Open
Subject Keyword	Nonmetallic Materials Hot Pressing Electrical Resistivity Tungsten Silicon Nitrides Electrical Insulation High Temperature Ceramics Molybdenum Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Technical Report

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