... in SN282 than in AS800 silicon nitride. The critical impact velocity where targets fractured catastrophically decreased with decreasing target size and was lower in SN282 than in AS800. Overall, FOD by steel projectiles was significantly less than that by silicon-nitride ceramic counterparts, due to much...

...Michael J. Vick; Andrew Heyes; Keith Pullen A three kilowatt turboshaft engine with a ceramic recuperator and turbine has been designed for small unmanned air vehicle (UAV) propulsion and portable power generation. Compared with internal combustion (IC) engines, gas turbines offer superior...

...Sung R. Choi; Donald J. Alexander; Robert W. Kowalik Foreign object damage behavior of an oxide/oxide (N720/AS) ceramic matrix composite was determined at ambient temperature using impact velocities ranging from 100 m/s to 400 m/s by 1.59 mm diameter steel-ball projectiles. Two different support...

... on metallic-coated components. The metallic bond coat provides oxidation and/or corrosion protection. It is generally believed that the primary failure mode of TBCs is delamination and fracture of the top ceramic coating parallel to the bond coat in the proximity of the thermally grown oxide (TGO) between...

...Sung R. Choi; Robert W. Kowalik Interlaminar crack growth resistances were evaluated for five different SiC fiber-reinforced ceramic matrix composites (CMCs) including three gas-turbine grade melt-infiltrated Si C ∕ Si C composites. Modes I and II crack growth resistances, G I and G II , were...

... reinforced composites fasteners silicon compounds gas turbines aircraft testing combustion failure (mechanical) melt infiltration aerospace propulsion ceramics A major focus of NASA’s enabling propulsion materials (EPM) program was development of advanced ceramic matrix composites (CMC’s...

..., with an electronic vehicle management unit supervising the system for control and regulation. Road simulation tests are presented, based on standard ECC driving mission cycles. The turbogas performance might be improved adopting ceramic blades, with a possible increase of the TIT (turbine inlet temperature...

...N. Kyriakis; T. Manikas; P. Pistikopoulos; E. Vouitsis Endothermic phenomena were identified during the regeneration of the porous ceramic diesel particulate trap. These phenomena were experimentally investigated and they were found to be related to the cerium content of the fuel used for the trap...

...Y. Suzuki; T. Satoh; M. Kawano; N. Akikawa; Y. Matsuda A reverse-flow annular combustor with its casing diameter of 400 mm was developed using an uncooled liner made of a three-dimensional woven ceramic matrix composite. The combustor was tested using the TRDI high-pressure combustor test facility...

... and a bending moment M. In this case, the effects of plastic deformation, creep of ceramic coating, as well as thermal growth oxidation and temperature gradient in TBC system are considered in the model due to the fact that these effects are considered in the calculation of thermal stress. The energy release...

...J. A. DiCarlo; H. M. Yun There exists today considerable interest in developing continuous fiber-reinforced ceramic matrix composites (CMC) that can operate as hot-section components in advanced gas turbine engines. The objective of this paper is to present simple analytical and empirical models...

...B. Schenk Honeywell Engines, Systems & Services has successfully addressed critical concerns that are slowing commercialization of structural ceramics in gas turbines. The U.S. Department of Energy (DoE) sponsored Ceramic Turbine Engine Demonstration Project (CTEDP) had the mission of advancing...

... testing, and engine testing has been performed on combustor liners and turbine shrouds made from such MI composites. Frame 5 sized combustor liners were rig tested under lean head end diffusion flame conditions for 150 hours, including 20 thermal trip cycles, with no observed damage to the ceramic liners...

...I. Takehara; T. Tatsumi; Y. Ichikawa The Japanese ceramic gas turbine (CGT) research and development program (FY1988-1998) as a part of the New Sunshine Project funded by the Ministry of International Trade and Industry (MITI) was completed in March 1999. Kawasaki Heavy Industries, Ltd. (KHI...

... 26 03 2002 thermal barrier coatings ceramics materials preparation electron beam deposition crystal microstructure texture life testing materials testing corrosion gas turbines zirconium compounds yttrium compounds oxygen compounds nickel alloys Efficiency...

...C. M. Grondahl; T. Tsuchiya The introduction of a ceramic gas turbine component in commercial power generation service will require significant effort. A careful assessment of the power plant performance benefit achievable from the use of ceramic components is necessary to rationalize the priority...

...M. Singh; E. Lara-Curzio Various issues associated with the design and mechanical evaluation of joints of ceramic matrix composites are discussed. The specific case of an affordable, robust ceramic joining technology (ARCJoinT) to join silicon carbide (CG-Nicalon™) fiber-reinforced-chemically vapor...

... determined at elevated temperatures using four different advanced ceramic materials, two silicon nitrides, one silicon carbide and one alumina for the Case I loading history, and alumina for the Case II loading history. The numerical solutions were in reasonable agreement with the experimental data...

... 2000 performance evaluation ceramics yttrium compounds zirconium compounds gas turbines thermal stress cracking thermal barrier coatings life testing The demand for increased gas turbine efficiency and improved durability, while reducing life cycle cost, has evoked a lot...

... deformation curves, together with the corresponding acoustic emission responses and the fracture properties of the material are used in defining the deformation characteristics of the coating (ceramic overlay with metallic bond coat where applicable) and substrate composite system. Experiments are aimed...