Download or read book Process for Growing Silicon Carbide Whiskers by Undercooling written by and published by . This book was released on 1987 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A method of growing silicon carbide whiskers, especially in the .beta. form, using a heating schedule wherein the temperature of the atmosphere in the growth zone of a furnace is first heated to or beyond the growth temperature and then is cooled to or below the growth temperature to induce nucleation of whiskers at catalyst sites at a desired point in time which results in the selection.

Download or read book Silicon Carbide Whiskers written by Henry Pàl Kirchner and published by . This book was released on 1962 with total page 64 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Handbook of Composites written by S.T. Peters and published by Springer Science & Business Media. This book was released on 2013-11-27 with total page 1135 pages. Available in PDF, EPUB and Kindle. Book excerpt: Today, fiber reinforced composites are in use • properties of different component (fiber, in a variety of structures, ranging from space matrix, filler) materials; craft and aircraft to buildings and bridges. • manufacturing techniques; This wide use of composites has been facili • analysis and design; tated by the introduction of new materials, • testing; improvements in manufacturing processes • mechanically fastened and bonded joints; and developments of new analytical and test • repair; ing methods. Unfortunately, information on • damage tolerance; these topics is scattered in journal articles, in • environmental effects; conference and symposium proceedings, in and disposal; • health, safety, reuse, workshop notes, and in government and com • applications in: pany reports. This proliferation of the source - aircraft and spacecraft; material, coupled with the fact that some of - land transportation; the relevant publications are hard to find or - marine environments; are restricted, makes it difficult to identify and - biotechnology; obtain the up-to-date knowledge needed to - construction and infrastructure; utilize composites to their full advantage. - sporting goods. This book intends to overcome these diffi Each chapter, written by a recognized expert, culties by presenting, in a single volume, is self-contained, and contains many of the many of the recent advances in the field of 'state-of-the-art' techniques reqUired for prac composite materials. The main focus of this tical applications of composites.

Download or read book Carbide Nitride and Boride Materials Synthesis and Processing written by A.W. Weimer and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 675 pages. Available in PDF, EPUB and Kindle. Book excerpt: Carbide, Nitride and Boride Materials Synthesis and Processing is a major reference text addressing methods for the synthesis of non-oxides. Each chapter has been written by an expert practising in the subject area, affiliated with industry, academia or government research, thus providing a broad perspective of information for the reader. The subject matter ranges from materials properties and applications to methods of synthesis including pre- and post-synthesis processing. Although most of the text is concerned with the synthesis of powders, chapters are included for other materials such as whiskers, platelets, fibres and coatings. Carbide, Nitride and Boride Materials Synthesis and Processing is a comprehensive overview of the subject and is suitable for practitioners in the industry as well as those looking for an introduction to the field. It will be of interest to chemical, mechanical and ceramic engineers, materials scientists and chemists in both university and industrial environments working on or with refractory carbides, nitrides and borides.

Download or read book Official Gazette of the United States Patent and Trademark Office written by and published by . This book was released on 1987 with total page 652 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Growth of 2H Silicon Carbide Crystals written by J. Anthony Powell and published by . This book was released on 1969 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Publications of Los Alamos Research written by Los Alamos National Laboratory and published by . This book was released on 1987 with total page 210 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Whisker Reinforced Structural Ceramics written by and published by . This book was released on 1987 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A VLS (vapor-liquid-solid) whisker growth process, optimized for the production of short (approx. 10 mm lengths) SiC whiskers, was modified to produce greater than or equal to 25 mm long whiskers. In conjunction with this modification, a plan was developed for incorporating an artificial-intelligence system to enhance the whisker growth process. An oriented whisker ribbon was produced from the long whiskers, as a step toward the development of a staple whisker yarn.

Download or read book Process for Producing Silicon Carbide Whiskers written by K. Shimazaki and published by . This book was released on 1986 with total page 19 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Synthesis and Characterization of VLS derived Silicon Carbide Whiskers written by and published by . This book was released on 1988 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Silicon carbide (SiC) whiskers have great potential, some already realized, in reinforcing ceramic matrix composites to give significant improvements in toughness and strength. Los Alamos has been developing the vapor-liquid-solid (VLS) process to grow single crystal BETA-SiC fibers having relatively few defects and diameters of from 3 to 5 .mu.m and lengths up to 100 mm. These whiskers have superb mechanical properties-strengths up to 16 GPa (2.3 Msi) and elastic modulus of 580 GPa (84 Msi) - and should have excellent stability at high temperatures. Two basic synthesis routes were investigated: 1) in situ SiO generation and 2) external gaseous Si source. Process 1) had a much more extensive prior developmental history and has been developed at Los Alamos to the point where significant and reproducible yields of prime whiskers can be obtained and scaleup could be considered. What we have learned about this process and its product will be the subject of this paper. 14 refs., 17 figs., 31 tabs.

Download or read book Development of Processes for the Production of High quality Long length SiC Whiskers written by James J. Shyne and published by . This book was released on 19?? with total page 97 pages. Available in PDF, EPUB and Kindle. Book excerpt: Beta silicon carbide whiskers in the form of long staple wool (1 - 10 microns diameter by 1/2 in. 1 in. length) have been grown by flowing a H2, CO, CH4, and N2 gas mixture through a reactor containing a silica source, and five pounds of the output whisker product have been delivered. Growth studies have been made in the temperature range of 2300 to 2800F in growth times ranging from 4 to 24 hours. The reactor consisted of a 20 KW furnace containing a quartz muffle. Gas composition, collector geometry, and materials have been studied to enhance the type and quantity of silicon carbide wool produced. The whiskers appear to grow by a vapor-liquid-solid mechanism. The wool formed has a cotton-like texture and is amenable to forming into yarns. The wool varies in color from buff to dark green presumably because of trace impurities. The whiskers are triangular in cross section and X-ray analysis has identified the material as beta silicon carbide. Tensile tests on the product have measured average rupture strengths in excess of one million psi and elastic modulus in the range of 92-95 million psi. Engineering design and scale-up studies at the level of 100 pounds per year of whisker wool have been conducted in a furnace with a 15-foot growth zone designed.

Download or read book Method of Production of Silicon Carbide Whiskers written by I. Kimura and published by . This book was released on 1986 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Method for Manufacturing Silicon Carbide Whiskers written by J. Dohi and published by . This book was released on 1983 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Engineered Materials Abstracts written by and published by . This book was released on 1994-10 with total page 648 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Prealloyed Catalyst for Growing Silicon Carbide Whiskers written by and published by . This book was released on 1988 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A prealloyed metal catalyst is used to grow silicon carbide whiskers, especially in the .beta. form. Pretreating the metal particles to increase the weight percentages of carbon or silicon or both carbon and silicon allows whisker growth to begin immediately upon reaching growth temperature.

Download or read book Formation of Silicon Monoxide and Application to the Growth of Vapor Liquid Solid Silicon Carbide Whiskers written by Joseph James Biernacki and published by . This book was released on 1987 with total page 756 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Growth of SiC Crystals from Vapor by the Bridgman Stockbarger Method written by Juris Smiltens and published by . This book was released on 1974 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt: From the dissociation curve (P vs. T), an equation for the rate of raising the pressure P of the binary vapor for obtaining the required linear growth rate of the crystal of c centimeters per hour is derived. It is shown that the rate is nearly proportional to P. Modifications of the furnace since the last report (Mat. Res. Bull. 4, S85, 1969) are described. Justification for the use of helium as the inert ambient gas is given. Two techniques are used: (1) growing with constant temperature of the crucible point and (2) growing with constant pressure of the sublimation bottle. To date, only polycrystalline boules consisting of large grains have been obtained. It is believed, however, that with certain technological improvements the methods that are developed here will ultimately yield single crystal boules. As a by-product, small cubic crystals, about one mm in the largest dimension, with good quality faces (cube and octahedron) have been obtained.