Global ETD Search
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Showing 1 to 9 of 9 for “"Nicalon"”.
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Damage analysis and mechanical response of as-received and heat-treated Nicalon/CAS-II glass-ceramic matrix composites
… in and mechanical response of heat-treated NicaloniCAS-II laminates subjected to monotonic flexure and axial loading and to cyclic tensile loading are reported. The specimens were subjected to post-processing heat treatments at 900°, 1000°, and l100°C in air for 100 hours. Changes at the …
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Low modulus, oxidation-resistant interface coatings for SiC/SiC composites
… put down uniform and crack-free CMZP coatings on Nicalon cloth and tows using sol-gel and metal organic deposition (MOD). The coated Nicalon cloth samples and tows were infiltrated with SiC matrix using Chemical Vapor Infiltration (CVI). Bars were cut for flexure testing from the infiltrated …
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Tensile behavior of unidirectional and cross-ply ceramic matrix composites
… matrix composite (GCMC) reinforced with Nicalon fibers and a Blackglas™ composite also reinforced with Nicalon fibers. Both had a symmetric cross-ply layup. Initial observations of the composites showed significant porosity and some cracking in the Blackglas™ samples. The GCMC samples …
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Nondestructive evaluation of a high temperature ceramic matrix composite material
… was to nondestructively characterize a 2-D Nicalon-reinforced, CVI-SiC matrix composite before and after exposure to 1000, 1200, and 1400 °C in oxidizing atmospheres of air. Concurrently, the nondestructive testing methods used to detect thermally induced changes in the SiC/SiC composite …
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Fatigue behavior of ceramic matrix composites at elevated temperatures under cyclic loading
… investigate and characterize fatigue behavior of Nicalon fiber reinforced enhanced silicon carbide matrix. composites at 1800 of under fully reversed cyclic loading. Notch effect on quasi-static tensile response is also considered. Quasi-static and fatigue damage mechanisms and failure modes are …
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Mechanical behavior of a ceramic matrix composite material
… layers of plain weave silicon carbide cloth (Nicalon) has been studied. The mechanical testing which was performed included both flexural and tensile loading configurations. This testing was done not only to determine the material properties, but also to initiate a controlled amount of damage …
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Mapping the thermal conductivity of SiC/SiC composites
… at all. This thesis uses TDTR to map Hi-Nicalon Type S fiber, CVI matrix SiC/SiC composites, enabling the measurement additional thermal information than can be obtained by measuring the matrix or fibers of a composite individually. The thermal conductivity of the interphase is also …
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Life prediction of fiber-reinforced composites: macro- and micro-mechanical modeling
… is carried out to predict the life of a notched Nicalon™/Silicon Carbide 2-D woven laminated composite coupon with a temperature distribution subject to fatigue loading. Global failure of the notched plate is predicted based on a Whitney-Nuismer type average strength criterion. In the second part …
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Understanding the Impact of Nuclear Environment on the Hydrothermal Corrosion in SIC
… The silica dissolution rate of nuclear grade Hi-Nicalon type S fibers and fibers manufactured with Rapid Laser chemical vapor deposition (R-LCVD) with varying surface chemistries were also obtained through experiments performed in static autoclave simulating PWR conditions. The hydrothermal …