Abstract:
This sintered body has a first material, a second material, and a third material. The first material is a cubic boron nitride. The second material is a compound including zirconium. The third material is an aluminum oxide which includes fine aluminum oxide. The sintered body has a first region in which the fine aluminum oxide is dispersed in an amount of 5% to 50% by volume in the second material. Along any straight line in the first region, an average value of a continuous distance occupied by the fine aluminum oxide is 0.08 μm or less, and a standard deviation of the continuous distance occupied by the fine aluminum oxide is 0.1 μm or less.
Abstract:
The present invention provides a CBN sintered body excellent both in defect resistance and in abrasion resistance. The binder phase in the CBN sintered body contains at least titanium diboride, aluminum diboride, aluminum nitride, and MC x N y (M is a transition metal element of Group 4 to 6, 0 i B j , and i + j = 1), wherein the content ratio of aluminum is 8 to 25% by mass relative to the total of the cubic boron nitride sintered body, the content ratio of MC x N y is 0.1 to 33% by mass relative to the total of the cubic boron nitride sintered body, in an X-ray diffractometry using a Cu-Κα line, I TiAlB2 /I CBN is 0.60 to 1.20, the ratio of I AlN /I CBN is 0.20 to 0.40, and the half-value width of I TiAlB2 is 0.250° to 0.420°.
Abstract:
High quality, catalyst-free boron nitride nanotubes (BNNTs) that are long, flexible, have few wall molecules and few defects in the crystalline structure, can be efficiently produced by a process driven primarily by Direct Induction. Secondary Direct Induction coils, Direct Current heaters, lasers, and electric arcs can provide additional heating to tailor the processes and enhance the quality of the BNNTs while reducing impurities. Heating the initial boron feed stock to temperatures causing it to act as an electrical conductor can be achieved by including refractory metals in the initial boron feed stock, or providing additional heat via lasers or electric arcs. Direct Induction processes may be energy efficient and sustainable for indefinite periods of time. Careful heat and gas flow profile management may be used to enhance production of high quality BNNT at significant production rates.
Abstract:
A superabrasive compact and a method of making the superabrasive compact are disclosed. A superabrasive compact may comprise a superabrasive volume and a substrate. The substrate may be attached to the superabrasive volume via an interface. The superabrasive volume may be formed by a plurality of polycrystalline superabrasive particles. The superabrasive particles may have nano or sub-micron scale surface texture.The surface texture is the result of treating the diamond or cBN particles in hydrogen or oxygen- containing atmoshere. The diamond or cBN particles are joined with the cemented tungsten carbide substrate by high pressure high temperature sintering.
Abstract:
A multi-component or 'composite' inorganic fiber comprising a nano-scale contiguous collection of a plurality of packed unique phases of material randomly interspersed throughout the fiber body, without unwanted impurities, and a method for producing same. Said phases include three or more foundational chemical elements from the Periodic Table mixed together during fiber production, producing distinct material phases interspersed throughout the fiber volume.
Abstract:
A ceramic matrix composite includes a plurality of fibers embedded in a matrix. The composition of the matrix is selected to achieve a desired relationship between the mechanical and thermal properties of the matrix and the fibers.