Development of Ultra High Temperature Ceramic Composites for Gas Turbine Combustors

Holmquist, M.; Lundberg, Robert; Razzell, T.; Sudre, Olivier; Molliex, L.; Adlerborn, J.

doi:10.1115/97-gt-413

Cited by 8 publications

(4 citation statements)

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“…The manufacturing method of the material has been described previously [13], however a brief description will be given. Single crystal alumina fibres were coated with a zirconia slurry containing a binder and carbon black.…”

Section: Materials and Component Manufacturingmentioning

confidence: 99%

Oxide/Oxide Ceramic Matrix Composites in Gas Turbine Combustors

Razzell

Molliex²,

Holmquist

et al. 1998

Volume 5: Manufacturing Materials and Metallurgy; Ceramics; Structures and Dynamics; Controls, Diagnostics and Instrumentation;

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Gas turbine combustor concepts designed to give improved control of NOx emissions require the usage of hot uncooled walls. The main material properties needed in this application include mechanical and chemical stability at temperatures in excess of 1400°C for long times (>10 000 hours). Composites made from single crystal oxide fibre reinforced oxide with a compatible high temperature stable weak oxide interphase are potential candidate materials to meet these requirements. Alumina was chosen as a model material, unidirectional and 2D composites were processed and a suitable weak zirconia interphase was designed. The process was scaled-up to make production of larger panels and components possible. Mechanical testing was carried out at room temperature to characterise the performance of the material in the as produced and thermally aged condition. Room temperature mechanical properties compared well with other current ceramic composites and excellent high temperature stability was demonstrated. The applicability of the composite as a material for uncooled combustor walls is to be further assessed by evaluation in a combustor test rig. Results from computational fluid dynamics and finite element calculations as well as results from combustor rig tests of monolithic and composite ceramic tiles will be presented.

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Section: Materials and Component Manufacturingmentioning

confidence: 99%

Oxide/Oxide Ceramic Matrix Composites in Gas Turbine Combustors

Razzell

Molliex²,

Holmquist

et al. 1998

Volume 5: Manufacturing Materials and Metallurgy; Ceramics; Structures and Dynamics; Controls, Diagnostics and Instrumentation;

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“…[ 15,16 ] In some recent studies, some evidence has been found regarding the emergence of ultrahigh temperature ceramics (UHTCs) enabling an innovative class of CMCs, namely ultrahigh temperature ceramic matrix composites (UHTCMCs). [ 17 ]…”

Section: Introductionmentioning

confidence: 99%

A Critical Review on Synthesis of Aluminum Metallic Composites through Stir Casting: Challenges and Opportunities

2020

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Aluminum metallic composites (AMCs) have been recognized as promising material exhibiting excellent functional and structural properties that can be significantly tailored to meet the industrial demands as well as to meet the design criteria for many applications such as aerospace, automobiles, marine, defense, and so on. Herein, an effort is made to provide an extensive overview of the various processing techniques adopted for the development of AMCs. Various processing kinetics of stir casting technique are elaborated comprehensively in terms of existing challenges, conceivable modifications incorporated in it. Considering the critical assessment on mechanical properties made through various kinds of literature, an electromagnetic stir-squeeze casting synergically equipped with ultrasonic transducing probe and bottom pouring attachments is recommended as the most appropriate processing technique for the development of AMCs. Moreover, appropriate recommendations regarding process variables and additives/modifiers, and potential future research opportunities are also addressed significantly to encourage the ongoing and upcoming researchers, which lead this critical Review toward novelty and uniqueness.

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“…SiC/SiC ceramic matrix composites (CMC) have been proposed for applications at temperatures exceeding 1400°C, but questions on their service life have arisen since these materials are susceptible to oxidative embrittlement . This resulted in a growing scientific interest in oxide CMCs for high‐temperature applications ranging from gas turbine engines to thermal shields as these composites can be used in oxidizing environments and at temperatures up to 1100°C. This maximum temperature is currently limited by the commercially available fibrous reinforcements that are prone to embrittlement, but current fiber development aims at oxide fibers with higher service temperatures …”

Section: Introductionmentioning

confidence: 99%

New liquid processing of oxide/oxide 3D wowen ceramic matrix composites

et al. 2018

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In this work, a novel process named Flexible Injection Process (FIP) was developed to manufacture near‐net shape oxide/oxide composites reinforced with 3D interlock fibers. This process uses a flexible membrane to apply pressure to promote transverse impregnation of the fibrous reinforcement by a slurry charged with sub‐micron ceramic particles. Due to the through‐thickness filtration and compaction, FIP process is much faster than typical in‐plane impregnation and results in composites with lower residual porosity than those produced by traditional processes. In this study, a mathematical modeling of the impregnation in FIP was developed and compared to experimental infiltration experiments. Furthermore, ceramic matrix composites (CMCs) produced by FIP were compared to composites manufactured via an established RTM‐like process. The two molding processes were compared to determine if the different flow behaviors have an impact on material densification, porosity formation, mechanical properties, and manufacturing time. CMCs produced by both methods resulted in similar microstructures, as determined by mercury intrusion porosimetry, even if FIP composites were marginally less porous. Finally, a comparison of mechanical properties resulting from the two manufacturing methods has shown a similar behavior. Thus, the main advantages of FIP molding were identified to be the shorter cycle time and the robustness of the impregnation compared to RTM‐like processes.

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Development of Ultra High Temperature Ceramic Composites for Gas Turbine Combustors

Cited by 8 publications

References 0 publications

Oxide/Oxide Ceramic Matrix Composites in Gas Turbine Combustors

Oxide/Oxide Ceramic Matrix Composites in Gas Turbine Combustors

A Critical Review on Synthesis of Aluminum Metallic Composites through Stir Casting: Challenges and Opportunities

New liquid processing of oxide/oxide 3D wowen ceramic matrix composites

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