by National Aeronautics and Space Administration, US Army Aviation Systems Command, For sale by the National Technical information Service in [Washington, DC], [St. Louis, Mo.], [Springfield, Va .
Written in English
|Statement||Ramakrishna T. Bhatt and David R. Hull.|
|Series||NASA technical memorandum -- 103772., AVSCOM technical report -- 91-C-014., AVSCOM technical report -- 91-C-14.|
|Contributions||Hull, David R., United States. Army Aviation Systems Command., United States. National Aeronautics and Space Administration.|
|The Physical Object|
50 SiC fiber have been fiberswere heat treatedbetween and °C in MPa argon and air environmentsfor up to hr. In theas-fabricatedcondition,thefibers showed -6GPatensile strength. After argon treatment,the fibers showedstrengthdegradationafter 1hr exposure beyond °C,but those. Get this from a library! Microstructural and strength stability of CVD SiC fibers in argon environment. [Ramakrishna T Bhatt; David R Hull; United States. Army Aviation Systems Command.; United States. National Aeronautics and Space Administration.]. The room-temperature tensile strengths of chemically-vapor-deposited SCS-6 silicon carbide fibers were measured after 1 to h heat treatments in MPa of argon at temperatures up to °C. The objective of this work is to evaluate irradiation effects under near-fusion environment by the dual-ion irradiation and TEM observation on the microstructural stability of advanced SiC reinforced SiC composites,. 2. Experimental. The material used in this study are advanced SiC fiber-reinforced SiC composites.
The room temperature tensile strength and microstructure of three types of commercially available chemically vapor deposited silicon carbide fibers were measured after 1, 10, and hour heat. Continuous “SiC” fibers manufactured at present contain Si, C, O, and N, with an excess of free carbor. Thermodynamic calculations show that these fibers are inherently unstable when exposed to high. 1. Introduction. SiCf/SiC composites generally exhibit excellent properties such as high strength at elevated temperature, oxidation resistance and microstructural stability under neutron irradiation,.Owing to these advantages, SiCf/SiC composites are known to be attractive materials for high-temperature structural applications, first wall and blanket components in fusion reactors. The CVD SiC coated on graphite (CVD SiC/Graphite) infiltrated by the yttrium citrate-urea precursor, combusted at of °C, and then sintered at °C, the thin yttria film can be achieved. The SEM morphology and EDS result of the thin yttria film show a mass of needle-shaped pining into the CVD SiC layer, which improves the combination of.
Raphael Bodet, Jacques Lamon, Nanying Jia, Richard E. Tressler, Microstructural Stability and Creep Behavior of Si‐C‐O (Nicalon) Fibers in Carbon Monoxide and Argon Environments, Journal of the American Ceramic Society, /jtbx, 79, 10, (), (). R. Bodet, J. Lamon, N. Jia, R. Tressler, Microstructural stability and creep behavior of Si-C-O (Nicalon) fibers in carbon monoxide and argon environment, J. Am. Ceram. Soc. 79 – (). CrossRef Google Scholar. In this paper the development of CVD SiC fibers and three generations of polymer derived SiC fibers over the past 50 years are discussed, illustrating the effect of fiber precursor and processing on the microstructure and physical properties of the non‐oxide ceramic fibers. while increasing their thermostructural stability. Citing. matrix), whereas the ultimate tensile strength would be reduced due to the lower fiber strength of prototype versions of Hi-Nicalon type S (cf. Table 1). 2. Yield and ultimate strength (irradiated) Neutron irradiation can produce a significant decrease in the flexural strength of SiC/SiC.