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Languages : en
Pages : 28
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Book Description
The results of high-temperature creep of various ceramic composites will be reviewed. In particular, creep results for Al2O3 and Si3N4 matrices reinforced with SiC whiskers will be emphasized. For a given temperature, stress and grain size, the creep rate of the Al2O3 composite is usually lower than that of the ceramic matrix. In general, creep at low stresses occurs by grain boundary sliding accommodated by diffusion, whereas higher stresses lead to damage accumulation processes which are manifested by triple point cavitation and cracking. The quasi-steady-state creep rates depend on grain size, whisker concentration, and the amount of glass phase present between the boundary of the whisker and the matrix. Unless all of the parameters are known, including the fabrication and loading histories, comparisons between various studies that used samples prepared in different ways are difficult. 44 refs., 7 figs., 2 tabs.
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ISBN:
Category :
Languages : en
Pages : 28
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Book Description
The results of high-temperature creep of various ceramic composites will be reviewed. In particular, creep results for Al2O3 and Si3N4 matrices reinforced with SiC whiskers will be emphasized. For a given temperature, stress and grain size, the creep rate of the Al2O3 composite is usually lower than that of the ceramic matrix. In general, creep at low stresses occurs by grain boundary sliding accommodated by diffusion, whereas higher stresses lead to damage accumulation processes which are manifested by triple point cavitation and cracking. The quasi-steady-state creep rates depend on grain size, whisker concentration, and the amount of glass phase present between the boundary of the whisker and the matrix. Unless all of the parameters are known, including the fabrication and loading histories, comparisons between various studies that used samples prepared in different ways are difficult. 44 refs., 7 figs., 2 tabs.
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ISBN:
Category :
Languages : en
Pages : 28
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Book Description
Author: Karl Jakus
Publisher: Elsevier
ISBN: 0080523889
Category : Technology & Engineering
Languages : en
Pages : 569
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Book Description
High Temperature Mechanical Behavior of Ceramic Composites provides an up-to-date comprehensive coverage of the mechanical behavior of ceramic matrix composites at elevated temperatures. Topics include both short-term behavior (strength, fracture toughness and R-curve behavior) and long-term behavior (creep, creep-fatigue, delayed failure and lifetime). Emphasis is on a review of fundamentals and on the mechanics and mechanisms underlying properties. This is the first time that complete information of elevated temperature behavior of ceramic composites has ever been compacted together in a single volume. Of particular importance is that each chapter, written by internationally recognized experts, includes a substantial review component enabling the new material to be put in proper perspective. Shanti Nair is Associate Professor at the Department of Mechanical Engineering at the University of Massachusetts at Amherst. Karl Jakus is Professor at the University of Massachusetts at Amherst.
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Category :
Languages : en
Pages : 25
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Book Description
The paper summarizes studies of SiC whisker-reinforced alumina composites their properties and the influence of composition and microstructure. Both steady-state toughness and R-curve response increase with whisker content and diameter. Room temperature flexure strength of aluminas with different grain sizes also increases with whisker content. Resistance to slow crack growth under both monotonic and cyclic loading is improved by whisker reinforcement compared to alumina and other ceramics. The thermal conductivity and electrical resistivity exhibit a substantial increase and decrease, respectively, with whisker loadings above 10 vol %. Thermal expansion coefficients decrease in a systematic fashion with increase in whisker content. However, the expansion coefficients are greater parallel to hot pressing axis compared to perpendicular direction owing to internal stresses and preferred orientation of whiskers. The changes in mechanical and thermal properties due to SiC whisker additions result in substantial improvement in thermal shock resistance for samples of various sizes. At elevated temperatures, tests in air show that improvements in strength and resistance to strength degradation are associated with SiC whisker reinforcement. The limiting factors in elevated temperature mechanical response of the composite at 1200C and above are related to surface oxidation-reaction processes and creep. On the other hand, the creep resistance of the composite is far greater than alumina with a similar fine grain size at temperatures (less-than or equal to) 1200C. Furthermore by increasing the grain size of the alumina matrix, creep resistance of the composite can be increased. In essence, SiC whisker reinforced alumina composites provide an example of a system whose properties can be tailored through control of microstructure and composition.
Author: R.C. Bradt
Publisher: Springer Science & Business Media
ISBN: 1489914412
Category : Science
Languages : en
Pages : 661
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Book Description
This proceedings volume, "Plastic Deformation of Ceramics," constitutes the papers of an international symposium held at Snowbird, Utah from August 7-12, 1994. It was attended by nearly 100 scientists and engineers from more than a dozen countries representing academia, national laboratories, and industry. Two previous conferences on this topic were held at The Pennsylvania State University in 1974 and 1983. Therefore, the last major international conference focusing on the deformation of ceramic materials was held more than a decade ago. Since the early 1980s, ceramic materials have progressed through an evolutionary period of development and advancement. They are now under consideration for applications in engineering structures. The contents of the previous conferences indicate that considerable effort was directed towards a basic understanding of deformation processes in covalently bonded or simple oxide ceramics. However, now, more than a decade later, the focus has completely shifted. In particular, the drive for more efficient heat engines has resulted in the development of silicon-based ceramics and composite ceramics. The discovery of high-temperature cupric oxide-based superconductors has created a plethora of interesting perovskite-Iike structured ceramics. Additionally, nanophase ceramics, ceramic thin films, and various forms of toughened ceramics have potential applications and, hence, their deformation has been investigated. Finally, new and exciting areas of research have attracted interest since 1983, including fatigue, nanoindentation techniques, and superplasticity.
Author: David Belitskus
Publisher: CRC Press
ISBN: 9780824791117
Category : Technology & Engineering
Languages : en
Pages : 376
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Book Description
Examines all important aspects of whisker and fibre reinforced ceramic science and technology, offering a balanced account of developments in the field. The work shows how to improve the strength and stiffness of ceramic composites, at very high temperatures, without brittleness.
Author: Committee on Advanced Fibers for High-Temperature Ceramic Composites
Publisher: National Academies Press
ISBN: 0309569036
Category : Technology & Engineering
Languages : en
Pages : 112
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Book Description
High-temperature ceramic fibers are the key components of ceramic matrix composites (CMCs). Ceramic fiber properties (strength, temperature and creep resistance, for example)-along with the debonding characteristics of their coatings-determine the properties of CMCs. This report outlines the state of the art in high-temperature ceramic fibers and coatings, assesses fibers and coatings in terms of future needs, and recommends promising avenues of research. CMCs are also discussed in this report to provide a context for discussing high-temperature ceramic fibers and coatings.
Author: Célio Albano da Costa Neto
Publisher:
ISBN:
Category :
Languages : en
Pages : 574
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Book Description
Author: Narottam P. Bansal
Publisher: Springer Science & Business Media
ISBN: 0387239863
Category : Technology & Engineering
Languages : en
Pages : 547
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Book Description
This valuable handbook has been compiled by internationally renowned researchers in the field. Each chapter is focused on a specific composite system or a class of composites, presenting a detailed description of processing, properties, and applications.
Author: John B. Wachtman
Publisher: John Wiley & Sons
ISBN: 0470315423
Category : Technology & Engineering
Languages : en
Pages : 482
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Book Description
This volume is part of the Ceramic Engineering and Science Proceeding (CESP) series. This series contains a collection of papers dealing with issues in both traditional ceramics (i.e., glass, whitewares, refractories, and porcelain enamel) and advanced ceramics. Topics covered in the area of advanced ceramic include bioceramics, nanomaterials, composites, solid oxide fuel cells, mechanical properties and structural design, advanced ceramic coatings, ceramic armor, porous ceramics, and more.
