Download or read book Fabrication of Silicon Carbide Whisker Reinforced Silicon Nitride Matrix Composites written by Marie Christine Willson 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 A Processing Sequence for the Fabrication of a Silicon Carbide Whisker Reinforced Reaction Bonded Silicon Nitride Composite written by Penelope A. Huber and published by . This book was released on 1990 with total page 250 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Fabrication of SiC Whiskers and Composites written by and published by . This book was released on 1984 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The Los Alamos Structural Ceramics Program is a multi-faceted program with an overall objective of producing superior strength and fracture toughness in ceramic bodies for load bearing applications. One phase of the program is pursuing the development of silicon carbide whiskers which are used to prepare ceramic matrix composites. The purpose of this work is to investigate strengthening and toughening mechanisms in ceramic composites. In the following we describe some elements of the whisker development program in which we are endeavoring better to characterize the whisker growth process in order to scale up its production potential. We have used these whiskers in the preparation of four types of ceramic matrix representative of a range of materials. The nature and reasons for choosing these materials are described. Composites have been prepared by dry-blending followed by hot pressing which yields high density bodies. In addition we are beginning an investigation of wet processing (slip casting) to produce a silicon-silicon carbide body which will be reaction sintered in nitrogen. Composites of glass-, hot pressed silicon nitride -, and molybdenum disilicide - silicon carbide whiskers have been tested in flexure to determine strength and fracture toughness. Results have been promising, with substantial toughening exhibited in all systems, and strengthening in the glass and MoSi2 composites. The reaction bonded silicon nitride is not yet to the testing stage.
Download or read book PROCESSING AND PROPERTIES OF SILICON CARBIDE WHISKER REINFORCED SILICON NITRIDE CERAMIC MATRIX COMPOSITES SILICON CARBIDE WHISKER REINFORCED SILICON NITRIDE written by STEPHEN DOUGLAS NUNN and published by . This book was released on 1991 with total page 368 pages. Available in PDF, EPUB and Kindle. Book excerpt: MgAl\sb2Si\sb4O\sb6N\sb4$, and the matrix and reinforcing phases. The fracture toughness appeared to be controlled by the ability of cracks to propagate along the intergranular phase.
Download or read book Fiber and Whisker Reinforced Ceramics for Structural Applications written by David Belitskus and published by CRC Press. This book was released on 1993-07-19 with total page 369 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book Handbook of Ceramic Composites written by Narottam P. Bansal and published by Springer Science & Business Media. This book was released on 2006-08-25 with total page 547 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book Effects of Interface Coating and Nitride Enhancing Additive on Properites of Hi Nicalon SiC Fiber Reinforced Reaction bonded Silicon Nitride Composites written by Ramakrishna T. Bhatt and published by . This book was released on 2000 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt: Strong and tough Hi-Nicalon SiC fiber reinforced reaction-bonded silicon nitride matirix composites (SiC/RBSN) have been fabricated by the fiber lay-up approach. Commercially available uncoated and PBN, PBN/Si-rich PBN, and BN/SiC coated SiC Hi-Nicalon fiber tows were used as reinforcement. The composites contained ~24 vol % of aligned 14 ♯m diameter SiC fibers in a porous RBSN matrix. Both one- and two-dimensional composites were characterized. The effects of interface coating composition, and the nitridation enhancing additive, NiO, on the room temperature physical, tensile, and interfacial shear strenght properties of SiC/RBSN matrix composites were evaluated. Results indicate that all three coated fibers, the thickness of the coating decreased from the outer periphery to the interior of the tows, and that from 10 to 30 percent of the fibers were not covered with the interface coating.
Download or read book Properties of Silicon Carbide Fiber Reinforced Silicon Nitride Matrix Composites written by Ramakrishna T. Bhatt and published by . This book was released on 1988* with total page 15 pages. Available in PDF, EPUB and Kindle. Book excerpt: The mechanical properties of NASA Lewis Research Center developed SiC/RBSN composites and their thermal and environmental stability have been studied. The composites consist of nearly 30 vol % of aligned 142 um diameter chemically vapor-deposited SiC fibers in a relatively porous silicon nitride matrix. In the as-fabricated condition, the unidirectional and two-dimensional composites exhibited metal-like stress-strain behavior, graceful failure, and showed improved properties when compared with unreinforced matrix of comparable density. Furthermore, the measured room temperature tensile properties were relatively independent of tested volume and were unaffected by artificial notches normal to the loading direction or by thermal shocking from temperatures up to 1100C. The four point bend strength data measured as a function of temperature to 1400C in air showed that as-fabricated strength was maintained to 1200C. At 1400C, however, nearly 15 percent loss in strength was observed. Measurement of room temperature tensile strength after 100 hr exposure at temperatures to 1400C in a nitrogen environment indicated no loss from the as-fabricated composite strength. (JES).
Download or read book Fabrication of Heat Resistant and Plastic Formable Silicon Nitride written by Toshiyuki Nishimura and published by Springer. This book was released on 2015-07-23 with total page 53 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this book, improvements in the heat resistance of silicon nitride (Si3N4) ceramics using grain boundary control and in plasticity at high temperatures using grain size control in order to reduce the cost of shaping Si3N4 are described. The heat resistance of Si3N4 is improved by mixing a slight amount of sintering additive as an impurity into the original material powder. The author presents his findings on the high heat resistance of Si3N4. The author also develops a new fabrication method for Si3N4 nano-ceramics that produces high plastic formability. The method developed offers two improved points in grinding and sintering processes. The author found that the plastic formability of Si3N4 nanoceramics is dependent on load stress; the results of his research are detailed in this book.
Download or read book Silicon Nitride Matrix Composites with Unidirectional Silicon Carbide Whiskers Reinforcement written by Pin Go and published by . This book was released on 1999 with total page 224 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Investigation of Silicon Carbide Whisker Reinforced Metallic Matrix Composites written by Harold N. Barr and published by . This book was released on 1967 with total page 67 pages. Available in PDF, EPUB and Kindle. Book excerpt: A technique was developed for orienting silicon carbide whiskers in a metal matrix which involves the preparation of a liquid slurry of the whiskers and matrix metal powder followed by the extrusion of the slurry through a fine orifice die. The technique was further developed for the fabrication of aluminum alloy-silicon carbide whisker composites with oriented whiskers. The fabrication of such shapes as strip, tubes, bushings, and cones with oriented whiskers was demonstrated. Mechanical properties of the aluminum alloy-silicon carbide whisker composites were measured at room temperature and at 204 to 427C. The effect of silicon carbide whisker loading, whisker type, and metal powder particle size was studied. (Author).
Download or read book Low Cost Fabrication of Silicon Carbide Based Ceramics and Fiber Reinforced Composites written by National Aeronautics and Space Adm Nasa and published by Independently Published. This book was released on 2018-12-29 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt: A low cost processing technique called reaction forming for the fabrication of near-net and complex shaped components of silicon carbide based ceramics and composites is presented. This process consists of the production of a microporous carbon preform and subsequent infiltration with liquid silicon or silicon-refractory metal alloys. The microporous preforms are made by the pyrolysis of a polymerized resin mixture with very good control of pore volume and pore size thereby yielding materials with tailorable microstructure and composition. Mechanical properties (elastic modulus, flexural strength, and fracture toughness) of reaction-formed silicon carbide ceramics are presented. This processing approach is suitable for various kinds of reinforcements such as whiskers, particulates, fibers (tows, weaves, and filaments), and 3-D architectures. This approach has also been used to fabricate continuous silicon carbide fiber reinforced ceramic composites (CFCC's) with silicon carbide based matrices. Strong and tough composites with tailorable matrix microstructure and composition have been obtained. Microstructure and thermomechanical properties of a silicon carbide (SCS-6) fiber reinforced reaction-formed silicon carbide matrix composites are discussed. Singh, M. and Levine, S. R. Glenn Research Center NASA-TM-107001, E-9216-1, NAS 1.15:107001 NAS3-27186; RTOP 537-04-10...
Download or read book SYNTHESIS AND CHARACTERIZATION OF SILICON CARBIDE WHISKERS AND THEIR APPLICATION IN SILICON NITRIDE MATRIX COMPOSITES SILICON CARBIDE SILICON NITRIDE written by Liya Wang and published by . This book was released on 1991 with total page 372 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Type C SiC whiskers showed a more obvious toughening effect for Si$\sb3$N$\sb4$ ceramics than the commercial Tokamax SiC whiskers. This might be due to the effect of interfacial bonding and/or the effect of the morphology and size of the whiskers.
Download or read book Silicon Carbide Whisker Reinforced Ceramic Composites and Method for Making Same written by and published by . This book was released on 1993 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The present invention is directed to the fabrication of ceramic composites which possess improved mechanical properties especially increased fracture toughness. In the formation of these ceramic composites, the single crystal SiC whiskers are mixed with fine ceramic powders of a ceramic material such as Al.sub. 2 O.sub. 3, mullite, or B.sub. 4 C. The mixtures which contain a homogeneous disperson of the SiC whiskers are hot pressed at pressures in a range of about 28 to 70 MPa and temperatures in the range of about 1600.degree. to 1950.degree. C. with pressing times varying from about 0.075 to 2.5 hours. The resulting ceramic composites show an increase in fracture toughness of up to about 9 MPa.m.sup. 1/2 which represents as much as a two-fold increase over that of the matrix material.
Download or read book Elevated Temperature Mechanical Behavior of Monolithic and SiC Whisker reinforced Silicon Nitrides written by and published by . This book was released on 1991 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Processing and Performance of Silicon Carbide Whisker Reinforced Alumina and Silicon Nitride Composites written by Chienchung James Shih and published by . This book was released on 1989 with total page 176 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Fiber Reinforced Ceramic Composites written by K.S. Mazdiyasni and published by William Andrew. This book was released on 1990-12-31 with total page 542 pages. Available in PDF, EPUB and Kindle. Book excerpt: Provides the first comprehensive treatment of continuous and discontinuous ceramic fiber and whisker reinforced ceramic composites, written by 29 authorities in the field.
