Download or read book Fibering of Oxides in a Refractory metal Matrices written by Robert W. Jech and published by . This book was released on 1967 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Fibering of Oxides in Refractory Metals written by R. W. Jech and published by . This book was released on 1967 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt: An investigation of the fibering of oxides by hot deformation in metal matrices was carried out using unalloyed columbium or tantalum as the matrix material and thorium oxide, zirconium oxide, magnesium oxide, or aluminum oxide. Composites were prepared by conventional powder metallurgical techniques and extrusion. The composites were examined for microstructures and fiber length-to-diameter ratio and tested in tension at room temperature and 1100, 2200, 2500, 2750, and 3000 F. Stress-rupture tests were conducted on the composites at 2200 and 2500 F for times up to 1000 hr. It was found that the oxides could be plastically deformed into fibers at temperatures well below their melting points when mechanically worked in a ductile matrix. Composites produced in this way exhibited improved tensile strengths and ratios of tensile strength to density as well as improved stress-rupture strength when compared to additive-free matrix materials and compared favorably with some commercial alloys.
Download or read book Fibering of Oxides in Refractory metal Matrices written by Robert W. Jech and published by . This book was released on 1967 with total page 45 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Oxide Deformation and Fiber Reinforcement in a Tungsten Metal oxide Composite written by Charles P. Blankenship and published by . This book was released on 1968 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt: Refractory oxide particles of urania (UO2) and zirconia (ZrO2) were added to a tungsten matrix and elongated into fibers by hot extrusion. Extrusion temperatures ranged from 3200 degrees to 4000 degrees F (1760 degrees to 2200 degrees C). The geometry of the oxide fibers appeared to be closest to that of an ellipsoid with the major axis alined in the extrusion direction. Oxide fibering was measured by an average length-to-width ratio of the fibers sectioned parallel to the major axis. the extent of oxide deformation was estimated in terms of strain components. Oxide-matrix deformation characteristics were related to the extrusion parameters by comparing the estimated oxide strain components to those of the composite. In terms of fibering, the greatest oxide elongation average length to width ratio = 200, was obtained in tungsten-UO2 composites extruded at 3600 degrees F (1980 degrees C) with a composite reduction of 18 to 1. values of average length to width ratio for tungsten-UO2 composites extruded at 3200 degrees and 4000 degrees F (1760 and 2200 degrees C) were nearly equal (average length to width ration =100) even though the composite reductions were 12 to 1 and 18 to 1, respectively. For a tungsten-ZrO2 composite extruded at 4000 degrees F (2200 degrees C), average length to width ratio =160. These length-to-width ratio values have no direct relation to the length-to-diameter ratio commonly used to describe fibered composites containing cylindrical fibers.
Download or read book Summary of the Tenth Meeting of the Refractory Composites Working Group written by E. S. Bartlett and published by . This book was released on 1965 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book NASA Technical Note written by and published by . This book was released on 1970 with total page 372 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Summary of the Ninth Meeting of the Refractory Composites Working Group written by E. S. Bartlett and published by . This book was released on 1965 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Reaction of Certain Oxides and Carbides with Refractory Metals at High Temperatures written by G. V. SAMSONOV and published by . This book was released on 1961 with total page 1 pages. Available in PDF, EPUB and Kindle. Book excerpt: Results are presented of an investigation of the contact reaction of BeO, MgO, ZrO2, and metal carbides (Zr, Hf, Nb, and Ta) with Nb, Mo, and WAT TEMPERATURES UP TO 2100 C. Oxides of chemically pure Be and Mg and ZrO2 stabilized with CaO, ZrC, HfC, NbC, and TaC of stoichiometric composition, and also industrially pure refractory metals were used. An oxide or carbide was pressed, after heating for 3 to 5 min on a hot forging press, onto a refractory metal sample. The products obtained were kept in a vacuum furnace with a graphite heater at temperatures from 1000 to 1600 to 2100 C for 0.5 to 5 hr. After extraction the ends were ground, polished, and examined metallographically. Tungsten had the greatest stability with BeO, Mo and W with Mgo, and Mo with stabilized ZrO2.
Download or read book Nuclear Science Abstracts written by and published by . This book was released on 1975-03 with total page 988 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Metal Matrix Composites written by C.T. Lynch and published by CRC Press. This book was released on 2018-01-18 with total page 468 pages. Available in PDF, EPUB and Kindle. Book excerpt: The concept of reinforcing a material by the use of a fiber is not a new one. The Egyptian brick layer employed the same principle more than three thousand years ago when straw was incorporated into the bricks. More recent examples of fiber reinforced composites are steel-reinforced concrete, nylon and rayon cord reinforced tires, and fiberglass reinforced plastics. In the last several years considerable progress has been made on new composite structures particularly utilizing boron (on tungsten substrate) fibers in various matrices. Many of these advances have been reviewed recently by P. M. Sinclair1 and by Alexander, Shaver, and Withers.2 An excellent earlier survey is available by Rauch Sutton, and McCreight.3 Boron-reinforced epoxy composites are being fabricated and tested as jet engine components, fuselage components, and even as a complete aircraft wing because of the tremendous gain in experimentally demonstrated properties such as modulus, strength, and fatigue resistance, particularly on a weight normalized (e.g., strength/density) basis. Other than glass/epoxy and boron/ epoxy composites and perhaps boron/aluminum, the systems now under study are in the early stages of research and development. These include other boron/metal composites, graphite/polymer, graphite/metal, graphite/graphite, alumina/metal, and aligned eutectic (directionally, solidified) combinations. As Sinclair points out, designers are wary about filamentary composites becausethere is little background information and scant experience.
Download or read book Fiber strengthened Metallic Composites written by and published by ASTM International. This book was released on 1967 with total page 186 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Materials Science and Engineering written by William D. Callister and published by John Wiley & Sons. This book was released on 2019-01-03 with total page 994 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Research and Technology Program Digest Flash Index written by and published by . This book was released on 1967 with total page 794 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book ASTM Special Technical Publication written by and published by . This book was released on 1967 with total page 196 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Oxide Based Fiber Reinforced Ceramic Matrix Composites written by Bilge Saruhan and published by Springer Science & Business Media. This book was released on 2013-11-27 with total page 208 pages. Available in PDF, EPUB and Kindle. Book excerpt: The purpose of Oxide-Based Fiber-Reinforced Ceramic-Matrix Composites is to provide comprehensive information on the most recent successful findings. The book consists of six chapters which characterize the current state of the art concerning oxide-based fiber-reinforced composites. Chapter one provides an introduction, examples of application areas and background information. Chapter two deals with the primary material properties for the areas of application and lists the possible constituent parts of the composites, depending on particular demands. Chapter three explains both the past and present fabrication methods which can affect the performance of the composites. Chapter four defines the interphase-related phenomena and describes the mechanical characteristics of the oxide-based fiber-reinforced composite, produced with different interphases. Chapter five deals with the fabrication route, functionality and mechanical characterization of the porous-matrix composites. The last chapter summarizes the present achievements and identifies requirements for reaching the goal, thereby providing a promising course for future research.
Download or read book NASA Technical Memorandum written by and published by . This book was released on with total page 450 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book NASA Scientific and Technical Reports written by United States. National Aeronautics and Space Administration Scientific and Technical Information Division and published by . This book was released on 1965 with total page 1152 pages. Available in PDF, EPUB and Kindle. Book excerpt:
