Found insideRefractory carbides and nitrides are useful materials with numerous industrial applications and a promising future, in addition to being materials of great interest to the scientific community. A novel hard-metal composition comprising borides and carbides of tungsten, nickel, and iron is made by reaction hot pressing mixtures of elemental tungsten, nickel, and iron powders with small quantities of boron carbide. Discovered by Edward G. Acheson about 1890, silicon carbide is one of the oldest materials and also a new material. It occurs naturally in meteorites, but in very small amounts and is not in a useable state as an industrial material. The volume complements more specialised books on specific materials as well as more general texts on ceramics or hard materials, presenting a survey of materials research as a key to technological development. Boron carbide semiconductor devices have a range of applications. Bend strengths of over 3,000,000 psi have also been measured and modulus values of 70 x 1000,000 psi have been obtained. These results are discussed in detail. The chemical and electronic structure, as related to the surface, interface and bulk of amorphous hydrogenated boron carbide (a-BxC:Hy), is of interest in neutron detection and microelectronics. The developed Boron Carbide/Aluminum based materials are a promising alternative for the use in lightweight armor application. In this work thermal, electrical and mechanical properties of dense B4C ceramics (99%) sintered using Spark Plasma Sintering (SPS) were investigated. From symposium on pore structures and properties of materials; Prague, Czechoslovakia (18 Sep 1973). CMCs are also discussed in this report to provide a context for discussing high-temperature ceramic fibers and coatings. The objective of these proceedings was to provide a platform for the exchange of information on the design, construction and operation of fusion experiments. This SBIR project has developed a low temperature polymer ceramic composite consisting of boron carbide layers bonded by cement, laminated with polymer sheets. The porosity of the ceramic was minimized by in situ hydrolysis of cement. The objective this AFOSR sponsored project was to design and synthesize new processable chemical precursors to nonoxide ceramics that allow the formation of the ceramics in nano-structured forms. Under the auspices of the NATO Science Committee an Advanced Research Workshop (ARW) was held on the Physics and Chemistry of Carbides, Nitrides and Borides (University of Manchester, 18-22 September, 1989) in order to assess progress to ... These hard coatings may be applied to tools and engine and other parts, as well to reduce wear on tribological surfaces and electronic devices. These boron coatings contain no morphological growth features. We found that uniaxial load can lead to amorphization. Other physical properties of boron carbide were calculated using the G(P, T) package. Found insideThese proceedings present the 38 invited papers presented at the outstanding international conference on Advanced Ceramics, held in Bombay in November 1990. Because of its neutronic properties, high hardness, and high melting temperature, boron carbide (B4C) is widely used at the Los Alamos Scientific Laboratory. These materials were fabricated from high purity powders without the additions of densification promoters. Fabrications were generally performed in the vicinity of 1800C at 120,000 psi for 10 minutes. In addition to the surface impurity removal, tritium monitoring was performed throughout the cleaning process. A bubbler system was set up to monitor the tritium level in the exhaust gas from the grit blaster unit. Machining of Hard Materials aims to provide the reader with the fundamentals and recent advances in the field of hard machining of materials. All the chapters are written by international experts in this important field of research. This volume encompasses the compounds of boron with Cl, Br, I, S, Se, and Te. The large final chapter treats carboranes and metallocarboranes and gives a listing of carborane-containing polymers. An exploration of electric refractory materials, this book covers developments of blue light-emitting diodes using GaN-based nitrides for laser and high-temperature and -frequency devices. The objective of this work was to understand the corrosion behavior of Boral® and Bortec® neutron absorbers over long-term deployment in a used nuclear fuel dry cask storage environment. Some of the futuristic applications are nanotubes for electrically conductive coatings and to increase the rate of reaction of thermoset resins; organosilane dendrimer coatings; buckyball coatings for machine parts; and metals for ... The research work has focused on characterization techniques which can be used at a micrometric sampling size so that individual powder grains of the material can be utilized. Opportunities in Protection Materials Science and Technology for Future Army Applications explores the current theoretical and experimental understanding of the key issues surrounding protection materials, identifies the major challenges ... Proceedings of the International Symposium in Novel Materials Processing by Advanced Electromagnetic Energy Sources (MAPEES'04) *Identifies and details recent progress achieved by advanced electromagnetic energy sources in materials ... V. I. MATKOVICH During the meeting of the International Symposium on Boron held in October, 1972 in Tbilisi, U.S.S.R., the idea was proposed to assemble a review of boron and refractory borides by the specialists present. A boron carbide capsule has been designed and used for spectral-tailoring experiments at the TRIGA reactor at Washington State University. An investigation was conducted to identify surface coatings which would improve the wear characteristics of compression molds used to mold contoured parts from elastomers filled with crystalline boron particles. Found inside – Page iiThis book focuses on Creep in Ceramics. The book consists of two parts. This handbook brings together, under a single cover, all aspects of the chemistry, physics, and engineering of surfaces and interfaces of materials currently studied in academic and industrial research. Hard, tough, lightweight boron-carbide-reactive metal composites, particularly boron-carbide-aluminum composites, are produced. These composites have compositions with a plurality of phases. In contrast to many previous publications dealing with carbides, the results presented in this collection relate to the properties of carbides having a definite phase composition, corresponding to a higher degree of purity 0 In some of the ... Cloth is coated at a temperature below about 1000.degree. C. with amorphous boron-carbon deposits in a process which provides a substantially uniform coating on all the filaments making up each yarn fiber bundle of the cloth. Associated with the ever increasing tendency to build nuclear reactors with long-life cores is the development of more stable nuclear fuels. Filaments were produced by depositing the reaction product of born trichloride, hydrogen and methane on a heated tungsten filamentary substrate which had a boron primer coat. Excess hydrogen was used as a carrier gas. The book also discusses aspects of analytical and numerical modeling, as well as laboratory-based high-strain rate testing and ballistic testing methodologies. This report describes measurements of the distribution of power in a uranium slug immediately adjacent to a prototype control spline. Measurements were made in the metal test stringer of the Hanford Test Pile. In this study single and multilayered boron carbide and boron carbonitride (BCN) thin films deposited with several sputtering configurations were investigated. In recent years, the friction stir welding process becomes advantageous due to its application to join aluminium alloys and dissimilar metals. This book covers some of the key challenges involving boron carbide that are currently being studied by many materials scientists and ceramists. The infiltrated precursor is further heat treated to produce a tailorable microstructure. 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