NDLI: High temperature compounds for turbine vanes. [of sic, si3n4, and si composites

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High temperature compounds for turbine vanes. [of sic, si3n4, and si composites

Content Provider	NASA Technical Reports Server (NTRS)
Author	Rhodes, W. H. Cannon Jr., R. M.
Copyright Year	1974
Description	Fabrication and microstructure control studies were conducted on SiC, Si3N and composites based on Si3N. Charpy mode impact testing to 2400 F established that Si3N4/Mo composites have excellent potential. Attempts to fabricate composites of Si3N4 with superalloys, both by hot pressing and infiltration were largely unsuccessful in comparison to using Mo, Re, and Ta which are less reactive. Modest improvements in impact strength were realized for monolithic Si3N4; however, SiC strengths increased by a factor of six and now equal values achieved for Si3N4. Correlations of impact strength with material properties are discussed. Reduced MgO densification aid additions to Si3N4 were found to decrease densification kinetics, increase final porosity, decrease room temperature bend strength, increase high temperature bend strength, and decrease bend stress rupture properties. The decrease in bend strength at high temperature for fine grain size SiC suggested that a slightly larger grain size material with a nearly constant strength-temperature relation may prove desirable in the creep and stress rupture mode.
File Size	5346160
Page Count	68
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19740006120
Archival Resource Key	ark:/13960/t4dn8x392
Language	English
Publisher Date	1974-01-01
Access Restriction	Open
Subject Keyword	Materials, Nonmetallic Silicon Compounds Fabrication Composite Materials Turbine Blades Charpy Impact Test Vanes High Temperature Research Microstructure 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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