Ceramic Materials and Components for Engines

Yan, Dou; Fu, Xin; Shi, S. X.

doi:10.1142/9789814533812

Cited by 3 publications

(20 citation statements)

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“…A similar variation of Q with d at a fixed stress was reported by Wakai et al 29 in high purity 3Y-TZP. The value of Q decreased from 603 to 455 kJ mol 21 as d increased from 0?5 mm (where n52?9) to 1 mm (where n52?1), at s520 MPa. The value of Q deduced when n<2 (Region III) is close to that reported in the creep of coarse-grained YSZP, 30,51,52 where n , 2, and for Y 2 O 3 -stabilised cubic-ZrO 2 single crystals, regardless of the Y 2 O 3 content.…”

Section: Activation Energy Qmentioning

confidence: 95%

“…For the finer grain size (d50?5 mm), Q decreases from 700 kJ mol 21 at 1250-1300uC to 540 kJ mol 21 at 1400-1450uC, at a similar stress level (s< 25 MPa). For a specific temperature (1400-1450uC), Q decreases from 540 kJ mol 21 for d50?5 mm and 25 MPa to 470 kJ mol 21 for d50?8 mm and 40 MPa. A similar variation of Q with d at a fixed stress was reported by Wakai et al 29 in high purity 3Y-TZP.…”

Section: Activation Energy Qmentioning

confidence: 97%

“…The values of Q given in the figure will be discussed in a later section. At very low stresses, deformation occurs by Nabarro-Herring diffusional creep (Region I), with the n values tending to 1 and Q being y460 kJ mol 21 . 8,15 When the stress increases, the creep parameters cease to be constant, with values of n from 3 to .5 being reported (Region II).…”

Section: Stress Exponent Versus Stressmentioning

confidence: 99%

“…8,15 When the stress increases, the creep parameters cease to be constant, with values of n from 3 to .5 being reported (Region II). 8,11,[17][18][19][20][21][22] For materials with grain sizes smaller than 1 mm and with a high concentration of impurities or with glassy phases, the stress exponent has been found to decrease to 1 with increasing stress. [23][24][25][26] The mechanisms which appear to give the best explanation of this behaviour take into consideration the presence of a vitreous intergranular film whose thickness, of y1 nm, can provide diffusion paths for matter transport.…”

Section: Stress Exponent Versus Stressmentioning

confidence: 99%

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High temperature plasticity in yttria stabilised tetragonal zirconia polycrystals (Y-TZP)

Domínguez‐Rodríguez

Gómez-Garcı́a

Wakai

2013

International Materials Reviews

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The literature data on the superplastic deformation of high purity yttria stabilised tetragonal zirconia polycrystals is reviewed in detail. It is shown that, based on the existence of a threshold stress, the single mechanism of grain boundary sliding (GBS) accommodated by diffusional processes can explain the superplasticity of these materials over all the ranges of temperature, stress, grain size, and surrounding atmosphere that have been studied. The origin of the threshold stress and its quantitative dependence on temperature and grain size is explained in terms of the segregation of yttrium atoms at the grain boundaries. A new model for GBS accommodated by lattice or grain-boundary diffusion is presented which can explain the transition of the stress exponent from 2 to 1.

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Section: Activation Energy Qmentioning

confidence: 95%

Section: Activation Energy Qmentioning

confidence: 97%

Section: Stress Exponent Versus Stressmentioning

confidence: 99%

Section: Stress Exponent Versus Stressmentioning

confidence: 99%

See 2 more Smart Citations

High temperature plasticity in yttria stabilised tetragonal zirconia polycrystals (Y-TZP)

Domínguez‐Rodríguez

Gómez-Garcı́a

Wakai

2013

International Materials Reviews

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“…The advantages and disadvantages of these material candidates are shown in Table II. Yan and others compiled a comprehensive study regarding ceramic materials and components for different engine configurations (Yan et al, 1994). Despite the advantages that ceramics hold over metals in terms of their creep resistance and oxidation/ corrosion resistance, they still exhibit low fracture toughness and are susceptible to foreign object damage (FOD) as shown in Table I.…”

Section: Selected Milestones Of the Ceramic Engine Eramentioning

confidence: 99%

Ceramic engine considerations for future aerospace propulsion

Gohardani

2012

Aircraft Engineering and Aerospace Technology

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Purpose -The purpose of this paper is to outline the potential usage of ceramic engines in combination with other technologies as a possible propulsion contender for future aerospace applications. Design/methodology/approach -The possibility of enabling novel propulsion systems in aerospace engineering is examined through a multilateral review study concerning ceramic engines and a proposed design approach. In view of the benefits and challenges of employing ceramic engines as possible candidates for the sustainable solutions of the future, a fundamental design proposal is presented for a conceptual generic unmanned air vehicle (GUAV). Findings -The findings of this article identify a number of useful scenarios for future ceramic engine applications and considerations. Research limitations/implications -It is imperative to emphasize that this conceptual article solely sheds light on a limited number of key ideas associated with ceramic engines and their possible applications. Thus, many new areas may emerge and impact the application of ceramic engines in light of more in-depth conceptual studies. Practical implications -Implications of ceramic engine utilization in aeronautical applications may result in enhanced performance characteristics and less operational costs. Further implications could possibly be extended to various naval/automotive applications and new configurations of transportation vehicles. Social implications -The paper aims to generate an interest amongst younger individuals and environmental aware enthusiasts to consider ceramic engines for transportation applications to a greater extent than before. Originality/value -The implementation of this particular conceptual design results in a synergistic ceramic engine combination with a hybrid airship design in novel aeronautical applications.

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Consolidation–microstructure–property relationships in bulk nanoceramics and ceramic nanocomposites: a review

Mukhopadhyay¹,

Basu²

2007

International Materials Reviews

176

113

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The recognition that bulk nanoceramic materials, having grain sizes typically 100 nm or finer, possess appealing mechanical, physical and tribological properties has generated considerable recent research activity. A major challenge in the research on bulk nanoceramics and nanoceramic composites is concerned with the aspect of processing, in particular restriction of grain growth during sintering. In this regard novel processing techniques have been developed with the aim of fabricating bulk ceramic nanomaterials. The superior properties exhibited by these bulk nanoceramics and ceramic nanocomposites, compared with conventional ceramic materials, have opened up prospects for their use in applications demanding better mechanical properties. The present review highlights outstanding issues related with the processing of nanoceramics and ceramic nanocomposites, discusses the novel processing techniques currently used to develop these materials, critically analyses the property modifications resulting from microstructural refinement and provides an overview of the structure-property correlations of some recently developed bulk nanoceramic materials. Potential fields of application for ceramic nanomaterials are surveyed. In conclusion, the unresolved issues related to bulk nanoceramic processing are considered and a perspective is given of areas of future research.

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Ceramic Materials and Components for Engines

Cited by 3 publications

References 0 publications

High temperature plasticity in yttria stabilised tetragonal zirconia polycrystals (Y-TZP)

High temperature plasticity in yttria stabilised tetragonal zirconia polycrystals (Y-TZP)

Ceramic engine considerations for future aerospace propulsion

Consolidation–microstructure–property relationships in bulk nanoceramics and ceramic nanocomposites: a review

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