The application of ceramic-matrix composites to the automotive ceramic gas turbine

Kaya, Hiroshi

doi:10.1016/s0266-3538(99)00016-0

Cited by 131 publications

(53 citation statements)

References 5 publications

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“…Silicon carbide fibre-reinforced ceramic matrix composites (CMCs) possess high temperature strength, toughness and creep resistance [1,2] making them suitable for aerospace and energy gas turbine applications. Substituting the currently used Ni-based superalloys used in aerospace by CMCs could result in a significant reduction of engine fuel consumption and emission of harmful combustion products [2,3].…”

Section: Introductionmentioning

confidence: 99%

“…Substituting the currently used Ni-based superalloys used in aerospace by CMCs could result in a significant reduction of engine fuel consumption and emission of harmful combustion products [2,3]. A major drawback of SiC/SiC composites is formation of volatile silicon hydroxide on them in high temperature combustion environments leading to rapid recession [4].…”

Section: Introductionmentioning

confidence: 99%

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Porcelain production by direct sintering

Lerdprom

Chinnam

Jayaseelan

et al. 2016

Journal of the European Ceramic Society

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Water vapour corrosion resistance of five rare earth monosilicates Y 2 SiO 5 , Gd 2 SiO 5 , Er 2 SiO 5 , Yb 2 SiO 5 , and Lu 2 SiO 5 was investigated during testing at 1350 ˚C for up to 166 h in static air with 90% water vapour. Four of the RE-silicates showed little weight gain (0.859 mg cm -2 ) after 166 h of exposure. Prior to testing the microstrucre consists of equiaxed grains of 4-7 ± 0.4 µm. XRD analysis showed that after 50 h exposure to water vapour corrosion Y, Er, Yb and Lu-silicates had both mono and disilicates present on their surfaces as a result of the reaction between monosilicate and water vapour to form disilicate, while Gd-silicate has converted completely to G 4.67 Si 3 O 13 making it less stable for environmental barrier coatings application. The microstructures of corroded Y, Er, Yb and Lu-silicates contain ridges and cracks, while that of Gd-silicate contains rounded grains suggesting melting along with striped contract grains.Keywords: Rare earth monosilicates, environmental barrier coating, water vapour resistance. IntroductionSilicon carbide fibre-reinforced ceramic matrix composites (CMCs) possess high temperature (Abcr, Germany, 4 ± 0.2 µm particle size) and SiO 2 (Abcr, Germany, 4 ± 0.1 µm particle size). All RE-oxides powders were 99.9% pure, while the SiO 2 powder was 99.0% pure.Particle size measurements were conducted using Malvern hydro equipment (2000SM, UK) and the average value was obtained based on three measurements for each powder. The exact weight per gram of each powder was homogeneously mixed in a ball mill using silicon carbide media (Union process, USA, 5 mm diameter) in ethanol for 24 h. The slurries were dried for 24h at 110 ˚C. 13 mm diameter and 3 mm thick pellets were obtained using uniaxial cold pressing (50 MPa) at room temperature. Y, Gd, Yb and Lu monosilicates were sintered for 3 hours at 1580˚C at a heating rate of 10˚C min -1 in a box furnace in air. However, to produce Er 2 SiO 5 , 12h sintering was necessary to obtain dense samples [18].Water vapour corrosion tests were conducted at 1350 ˚C for 50, 100 and 166 h in 90% water:10% air ratio with flow rate of 40 ml/min in an alumina tube (50 mm diameter and 1200 mm length) furnace ((Lenton, Hope, UK) at a heating and cooling rate of 10 ˚C min -1 and 20 ˚C min -1 respectively. Sample dimensions were 10 mm diameter and 3 mm thick. Samples were placed on high purity alumina boats (Almath crucibles, Newmarket, UK) and their weight was recorded before and after the corrosion tests with an accuracy of ± 0.001 g to determine the weight change. To exclude the water vapour corrosion taking place at low temperature, the water vapour was introduced when the temperature reached 1350 ˚C and the flow was stopped after the desired testing period.Phases were identified by XRD (Bruker D2 Phaser, Germany) on sample's surface which was not in contact with the alumina boat during corrosion test using CuKα radiation with spectra recorded from 10-70˚. Crystalline phases were determined using Xpert High Score Plus softwa...

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Porcelain production by direct sintering

Lerdprom

Chinnam

Jayaseelan

et al. 2016

Journal of the European Ceramic Society

View full text Add to dashboard Cite

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“…The industries are also interested in CMCs from the view point of the design and the industrial application. H. Ohnabe et al [9] and H. Kaya [10] introduced the application of CMCs to the aerospace engine and the automotive ceramic gas turbine. H. Ohya et al [11] also discussed the structural design of the aerospace engine using CMCs.…”

Section: Introductionmentioning

confidence: 99%

Prediction of stress-strain behavior of ceramic matrix composites using unit cell model

Suzuki

Ohtake

Otani

et al. 2015

MATEC Web of Conferences

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Abstract. In this study, the elastic modulus and the stress-strain curve of ceramic matrix composites (CMCs) were predicted by using the unit cell model that consists of fiber bundles and matrix. The unit cell model was developed based on the observation of cross sections of CMCs. The elastic modulus of CMCs was calculated from the results of finite element analysis using the developed model. The non-linear behavior of stressstrain curve of CMCs was also predicted by taking the degradation of the elastic modulus into consideration, where the degradation was related to the experimentally measured crack density in CMCs. The approach using the unit cell model was applied to two kinds of CMCs, and good agreement was obtained between the experimental and the calculated results.

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“…Silicon-based ceramic matrix composites have become the most promising candidates for hot-section components in aero-engines due to their low density, high-temperature mechanical performance and excellent oxidation resistance, which can lighten the weight, reduce the emission of CO 2 and NO x , and promote the efficiency of engine [1,2]. However, in the aero-engine service environment, combustion products consisting of water vapor and molten salt will erode silicon-based hot-sections in the combustor [3,4].…”

Section: Introductionmentioning

confidence: 99%

An Investigation of Environment Barrier Coating on 2D C/SiC Composites Prepared by Liquid Phase Process

Zhou

Cheng

Deng

et al. 2012

J Inorg Organomet Polym

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Sc 2 Si 2 O 7 -based environmental barrier coating (EBC) was prepared on 2D C/SiC composites by different liquid phase processes. Single Sc 2 Si 2 O 7 coating was brushed with sol and slurry. The multi-layer coating, which consisted of BSAS (Ba 0.25 Sr 0.75 Al 2 Si 2 O 8 , B) as bond coat, BSAS ? Sc 2 Si 2 O 7 (BS) as interlayer and Sc 2 Si 2 O 7 (S) as top coat, was painted with slurry and modified slurry. The slurry process was modified using amorphous instead of crystallized powders as raw materials derived from the solgel method. Modification mechanisms were proposed and characterized by weight losses of BSAS and Sc 2 Si 2 O 7 dry gel from thermogravimetric analysis and their sintering shrinkage ratios from coefficient of thermal expansion tests. The microstructure of the prepared coating was observed using scanning electron microscopy. The phase composition was detected by X-ray diffraction. The results showed that the S/BS/B coating with 30 lm thickness, which was prepared by the modified slurry, possessed excellent adhesion to the substrate and the best compactness among the above coatings. Higher activity, lower sintering energy barrier and tiny sintering shrinkage of S and B amorphous powders are mainly responsible for the performance enhancement.

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The application of ceramic-matrix composites to the automotive ceramic gas turbine

Cited by 131 publications

References 5 publications

Porcelain production by direct sintering

Porcelain production by direct sintering

Prediction of stress-strain behavior of ceramic matrix composites using unit cell model

An Investigation of Environment Barrier Coating on 2D C/SiC Composites Prepared by Liquid Phase Process

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