Author: Calvin Haywood CarterPublisher:
ISBN:
Category : Creep testing machines
Languages : en
Pages : 410
Book Description
Kinetics and Mechanisms of High-temperature Creep in Chemically Vapor Deposited and Reaction-bonded Silicon Carbide
Author: Calvin Haywood CarterPublisher:
ISBN:
Category : Creep testing machines
Languages : en
Pages : 410
Book Description
Kinetics and Mechanisms of High-Temperature Creep in Silicon Carbide. II. Chemically Vapor Deposited
Author: C. H Carter (Jr)Publisher:
ISBN:
Category :
Languages : en
Pages : 10
Book Description
Chemically vapor deposited (CVD) silicon carbide was subjected to constant compressive stresses (110 to 220 MN/sq m) at high temperatures (1848 to 2023 K) in order to determine the controlling steady-state creep mechanisms under these conditions. An extensive TEM study was also conducted to facilitate this determination. The strong preferred crystallographic orientation of this material causes the creep rate to be very dependent on specimen orientation. The stress exponent, n, in the equation epsilon alpha sigma was calculated to be 2.3 below 1923 K and 3.7 at 1923 K. The activation energy for steady-state creep was determined 175 to be + or - 5 kJ/mol throughout the temperature range employed. At temperatures between 1673 and 1873 K, the controlling creep mechanism for CVD SiC is dislocation glide, which is believed to be controlled by the Peierls stress, Although the activation energy does not change, the increase in the stress exponent for samples deformed at 1923 K suggests that the controlling creep mechanism becomes dislocation glide/climb controlled by climb. Additional keywords: reprints; microstructure; x ray scattering.
Research in Progress
Author: United States. Army Research OfficePublisher:
ISBN:
Category : Military research
Languages : en
Pages : 284
Book Description
Vols. for 1977- consist of two parts: Chemistry, biological sciences, engineering sciences, metallurgy and materials science (issued in the spring); and Physics, electronics, mathematics, geosciences (issued in the fall).
Research in Progress
Author: Handbook of Advanced Ceramics
Author: Tatsuki OhjiPublisher: Elsevier Inc. Chapters
ISBN: 0128057343
Category : Technology & Engineering
Languages : en
Pages : 65
Book Description
Energy Research Abstracts
Author: Dissertation Abstracts International
Author: Publisher:
ISBN:
Category : Dissertations, Academic
Languages : en
Pages : 856
Book Description
Plastic Deformation of Ceramics
Author: R.C. BradtPublisher: Springer Science & Business Media
ISBN: 1489914412
Category : Science
Languages : en
Pages : 661
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.
Structural Ceramics
Author: John Jr. WachtmanPublisher: Elsevier
ISBN: 0323152201
Category : Technology & Engineering
Languages : en
Pages : 401
Book Description
Treatise on Materials Science and Technology, Volume 29: Structural Ceramics presents an overview of structural ceramics. This book begins with a survey of potential uses, designs, and barriers of particular types of structural ceramics. The silicon carbide family, silicon nitride and sialon family, and transformation toughened ceramics are discussed in detail, followed by an analysis of the various processing routes of each family of structural ceramics. This publication concludes with a review of the tribology of structural ceramics, considering many applications for structural ceramics in heat engines and other machinery that involve moving parts which must often resist wear or erosion. This volume is recommended for engineers, scientists, and researchers concerned with structural ceramics.
Comprehensive Hard Materials
Author: Daniele MariPublisher: Newnes
ISBN: 0080965288
Category : Technology & Engineering
Languages : en
Pages : 1809
Book Description
Comprehensive Hard Materials, Three Volume Set deals with the production, uses and properties of the carbides, nitrides and borides of these metals and those of titanium, as well as tools of ceramics, the superhard boron nitrides and diamond and related compounds. Articles include the technologies of powder production (including their precursor materials), milling, granulation, cold and hot compaction, sintering, hot isostatic pressing, hot-pressing, injection moulding, as well as on the coating technologies for refractory metals, hard metals and hard materials. The characterization, testing, quality assurance and applications are also covered. Comprehensive Hard Materials provides meaningful insights on materials at the leading edge of technology. It aids continued research and development of these materials and as such it is a critical information resource to academics and industry professionals facing the technological challenges of the future. Hard materials operate at the leading edge of technology, and continued research and development of such materials is critical to meet the technological challenges of the future. Users of this work can improve their knowledge of basic principles and gain a better understanding of process/structure/property relationships. With the convergence of nanotechnology, coating techniques, and functionally graded materials to the cognitive science of cemented carbides, cermets, advanced ceramics, super-hard materials and composites, it is evident that the full potential of this class of materials is far from exhausted. This work unites these important areas of research and will provide useful insights to users through its extensive cross-referencing and thematic presentation. To link academic to industrial usage of hard materials and vice versa, this work deals with the production, uses and properties of the carbides, nitrides and borides of these metals and those of titanium, as well as tools of ceramics, the superhard boron nitrides and diamond and related compounds.