Materials Literature
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Representations for the thermal expansion of NaCl-structure-type oxides are established based on corresponding states principles and simple lattice dynamical models. The semi-empirical expressions provide quantitative information over an extended temperature range and predictions where data is limited or in some cases…
Internal pressurization and diametrical loading techniques were developed to measure the fracture strength of chemically vapor-deposited (CVD) silicon carbide (SiC) coating in nuclear fuel particles. Miniature tubular and hemispherical shell specimens were used for both test methods. In the internal pressurization tes…
The future opportunities for the use of advanced ceramics and various types of ceramic matrix composites in aerospace applications will be discussed. The areas covered will include DoD applications in aircraft, missiles and spacecraft, and civilian applications in aircraft and space vehicles. The potential for various…
A simple and rapid process has been developed that allows the facile formation of highly crystalline calcium hexaluminate (CaAl12O19, hibonite) and lanthanum hexaluminate (LaAl11O18). Carboxylate-alumoxanes are reacted with the appropriate metal acetylacetonate complexes, M(acac)n, to form metal-doped carboxylate-alum…
Stress rupture strength of SYL-iBN/BN/SiC composite was evaluated at 550 and 750°C with 0, 20, and 60% moisture content (MC). No embrittlement of fiber/matrix interphase was observed at 550°C and 750°C with 0% MC. At 550°C, 20% and 60% MC, evidence of embrittlement increased with test duration. Extensive embrittlement…
Innovative and novel applications of CMCs are critical to the success of GenIV: Next Generation Nuclear Power (NGNP) plants. Regularity requirements (e.g., Nuclear Regulatory Commission) demand the implementation of test standards, design codes and data bases for CMCs as part of the licensing and approval of this new…
Life prediction of C/SiC composites under stress rupture loading conditions was modeled using a Probabilistic Residual Strength (PRS) technique. The model considered the material's initial static strength, time-to-failure, and intermediate residual strength to be random variables. Statistically significant strength an…
This paper describes the densification of 3D carbon (continuous) fibrous preforms with a SiC matrix using methyltrichlorosilane (MTS) as the precursor in a gas mixture of hydrogen and argon. The reproducibility in infiltration time, matrix gain and relative composite density as estimated from three FCVI experiments in…
Ceramics Matrix Composites (CMC) are promising candidate materials for rocket engine thrust chamber applications due to their light weight, high strength, and high temperature capability. A SiC/SiC chamber developed by IHI was manufactured and evaluated using leak, pressure proof and hot firing tests. The chamber surv…
An experimental investigation of indentation fracture testing was carried out with specific reference to test variables such as the indentation toad, the impact velocity, and the residence time. The test results on many ceramics are discussed on the basis of microstructure and surface conditions.
Based on thermal spray technologies a coating process for refractory ceramic layers even on temperature sensitive fiber substrates has been developed, so that the coated fabrics retain their flexibility. Fiber woven fabrics, coated with hard ceramic materials combine the positive characteristics of both materials, suc…
The goal of this work is to use variable frequency microwave processing to crystallize lithium disilicate glass (Li2Si2O5) into a glass-ceramic material. Variable frequency microwave (VFM) processing significantly reduces the time required for crystallizing lithium disilicate glass into a glass-ceramic in comparison t…
Plasma-sprayed ZrO2–8wt%Y2O3 and mullite+BSAS/Si multilayer thermal and environmental barrier coating (TBC–EBC) systems on SiC/SiC ceramic matrix composite (CMC) substrates were thermally cyclic tested under high thermal gradients using a laser high-heat-flux rig in conjunction with furnace exposure in water-vapor env…
Monolithic SiC and unidirectional SiC/SiC composites were prepared by NITE process, using SiC “nano”-slurry infiltration technique, and the effects of tailoring raw materials and of processing conditions on density, microstructural evolution and mechanical properties were investigated. In particular, the mechanism on…
Recent automotive engineering developments concerning fuel consumption regulations and decreasing material and manufacturing cost result in an increasing utilization of light metal components for automotive applications. Significant weight savings are obtained by changing the engine block material from cast iron to al…
In this study we successfully used microwave hybrid heating to process alumina-zirconia composites. We evaluated the effect of composition on microwave processibility and resulting properties, and determined if microwave processing resulted in significant property gradients. We found that samples with increased zircon…
In order to model the long-term durability and reliability of SiC-based, clay-bonded ceramic candle filters at complex service environments, it is first necessary to understand the mechanisms responsible for their failure in a manner that is scientifically and technologically tractable, i.e.-through experiments at the…
Glass-based sealants have been developed with emphasis on filler material and surface treatment of the sealing components in order to optimise their mechanical and functional behaviour during the initial sealing process as well as during thermal cycling of the SOFC-stack after exposure to operating conditions. The bon…
The feasibility of brazing LSCoF ceramic substrates with silver-vanadium pentoxide (Ag-V2O5) alloys for use in solid oxide fuel cell (SOFC) applications was studied. Preliminary testing was also performed on the Ag-V2O5/alumina (Al2O3) system in order to determine the feasibility of brazing LSCoF to Fecralloy™ with an…
Ceramic matrix composite materials (CMC) were originally developed for high temperature applications such as heat shields or thermal protection for spacecraft. Different processing techniques are currently in use for the manufacture of continuous fibre reinforced ceramic matrix composites, which result in low weight m…