Download or read book Strength Degrading Mechanisms for CVD SCS 6 SiC Fibers in Argon Environments written by Ramakrishna T. Bhatt and published by . This book was released on 1996 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Strength Degrading Mechanisms for CVD SCS 6 SiC Fibers in Argon Environments written by Ramakrishna T. Bhatt and published by . This book was released on 1996 with total page 17 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Microstructural and Strength Stability of CVD SiC Fibers in Argon Environment written by Ramakrishna T. Bhatt and published by . This book was released on 1991* with total page 18 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Microstructural and Strength Stability of a Developmental CVD SiC Fiber written by Ramakrishna T. Bhatt and published by . This book was released on 1995 with total page 18 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Environmental Effects on the Tensile Strength of Chemically Vapor Deposited Silicon Carbide Fibers written by and published by . This book was released on 1985 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt: The room temperature and elevated temperature tensile strengths of commercially available chemically vapor-deposited silicon carbide fibers were measured after 15 min heat treatment to 1600 C in various environments. These environments included oxygen, air, argon and nitrogen at one atmosphere and vacuum at 10 to the minus 9th power atmosphere. Two types of fibers were examined which differed in the SiC content of their carbon-rich coatings. Threshold temperature for fiber strength degradation was observed to be dependent on the as-received fiber-flaw structure, on the environment and on the coating. Fractographic analyses and flexural strength measurements indicate that tensile strength losses were caused by surface degradation. Oxidation of the surface coating is suggested as one possible degradation mechanism. In general, the SiC fibers containing the higher percentage of SiC near the surface of the carbon rich coating showed better strength retention and higher elevated temperature strength. (Author).

Download or read book Environmental Effects on the Tensile Strength of Chemically Vapor Deposited Silicon Carbide Fibers written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-08-16 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt: The room temperature and elevated temperature tensile strengths of commercially available chemically vapor-deposited (CVD) silicon carbide fibers were measured after 15 min heat treatment to 1600 C in various environments. These environments included oxygen, air, argon and nitrogen at one atmosphere and vacuum at 10/9 atmosphere. Two types of fibers were examined which differed in the SiC content of their carbon-rich coatings. Threshold temperature for fiber strength degradation was observed to be dependent on the as-received fiber-flaw structure, on the environment and on the coating. Fractographic analyses and flexural strength measurements indicate that tensile strength losses were caused by surface degradation. Oxidation of the surface coating is suggested as one possible degradation mechanism. The SiC fibers containing the higher percentage of SiC near the surface of the carbon-rich coating show better strength retention and higher elevated temperature strength. Bhatt, R. T. and Kraitchman, M. D. Glenn Research Center NASA-TM-86981, E-2519, NAS 1.15:86981, USAAVSCOM-TR-85-C-4, AD-A157111 RTOP 533-05-12...

Download or read book Mechanical Properties of Ceramics and Composites written by Roy W. Rice and published by CRC Press. This book was released on 2000-04-18 with total page 716 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents a comprehensive review, evaluation, and summary of the dependence of mechanical properties on grain and particle parameters of monolithic ceramics and ceramic composites. Emphasizing the critical link between fabrication and ceramic performance, the book covers the grain dependence of monolithic properties and the dependence of c

Download or read book Microstructural and Strength Stability of CVD SiC Fibers in Argon Environment written by Ramakrishna T. Bhatt and published by . This book was released on 1991 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book 15th Annual Conference on Composites and Advanced Ceramic Materials Part 2 of 2 Volume 12 Issue 9 10 written by John B. Wachtman and published by John Wiley & Sons. This book was released on 2009-09-28 with total page 668 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.

Download or read book Effects of High Temperature Argon Heat Treatment on Tensile Strength and Microstructure of BN SiC Coated SiC Fiber Preforms written by and published by . This book was released on 1999 with total page 18 pages. Available in PDF, EPUB and Kindle. Book excerpt: Preforms of BN/SiC coated Hi-Nicalon and Sylramic SiC fibers were heat treated under 0.1 MPa argon pressure between 1000 deg to 1800 deg C for 1 and 100h. The effects of high temperature exposure on physical dimensions, weight, room temperature tensile strength, and microstructure of preforms have been studied. Both preforms showed shrinkage and weight loss, and microstructural changes beyond 1000 deg C. After 100 hr exposure, the Hi-Nicalon preforms showed strength degradation beyond 1200 deg C. The mechanisms of the strength degradation appear to be grain growth of the SiC fibers and crystallization of the BN coating. After 100 hr, the Sylramic preforms heat treated to 1000 deg C retained their as-produced strength while some of those heat-treated between 1000 deg and 1800 deg C showed strength degradation and others did not. At 1800 deg C, the ultimate tensile strength decreased with increasing time of exposure. Reasons for strength degradation of Sylramic preforms are being investigated.

Download or read book Handbook of Properties of Textile and Technical Fibres written by A. R. Bunsell and published by Woodhead Publishing. This book was released on 2018-01-02 with total page 1054 pages. Available in PDF, EPUB and Kindle. Book excerpt: Handbook of Properties of Textile and Technical Fibres, Second Edition introduces tensile properties and failure and testing of fibers, also examining tensile properties and the failure of natural fibers, such as cotton, hemp, flax, agave, wool and silk. Next, the book discusses the tensile properties and failure of synthetic fibers, ranging from polyamide, polyester, polyethylene and carbon fibers. Chapters provide a general background of the fiber, including its manufacture, microstructure, factors that affect tensile properties and methods to improve tensile failure. With its distinguished editor and international contributors, this book is an important reference for fiber scientists, textile technologists, engineers and academics. Offers up-to-date coverage of new and advanced materials for the fiber and textile industries Reviews structure-property relationships of high-performance natural, synthetic polymer and inorganic fibers Offers a range of perspectives on the tensile properties of fibers from an international team of authors with diverse expertise in academic research and in textile development and manufacture

Download or read book Development of large diameter amorphous ceramic SiCN fibres from selective chemical cross linked oligosilazanes written by Octavio-Jun Flores Urushima and published by Cuvillier Verlag. This book was released on 2014-11-13 with total page 164 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Creep and Rupture Strength of an Advanced CVD SiC Fiber written by and published by . This book was released on 1997 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book High Temperature Mechanical Characterization of Ceramic Matrix Composites written by John Z. Gyekenyesi and published by . This book was released on 1998 with total page 288 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Chemical Vapour Deposition written by Xiu-Tian Yan and published by Springer Science & Business Media. This book was released on 2010-03-23 with total page 352 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Chemical Vapour Deposition: An Integrated Engineering Design for Advanced Materials" focuses on the application of this technology to engineering coatings and, in particular, to the manufacture of high performance materials, such as fibre reinforced ceramic composite materials, for structural applications at high temperatures. This book aims to provide a thorough exploration of the design and applications of advanced materials, and their manufacture in engineering. From physical fundamentals and principles, to optimization of processing parameters and other current practices, this book is designed to guide readers through the development of both high performance materials and the design of CVD systems to manufacture such materials. "Chemical Vapour Deposition: An Integrated Engineering Design for Advanced Materials" introduces integrated design and manufacture of advanced materials to researchers, industrial practitioners, postgraduates and senior undergraduate students.

Download or read book Ceramic Fibers and Coatings written by Committee on Advanced Fibers for High-Temperature Ceramic Composites and published by National Academies Press. This book was released on 1998-05-05 with total page 112 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.

Download or read book Advances in Ceramic matrix Composites written by and published by . This book was released on 1994 with total page 1080 pages. Available in PDF, EPUB and Kindle. Book excerpt: