Sumitomo Electric Industries, Limited

Kanegafuchi Kagaku Kogyo Kabushiki Kaisha

Sumitomo Electric Hardmetal Corp.

Japan Vam & Poval Co., Ltd.

Tohoku University

Yoshihiro Kimura

Yasuki Kido

Anongsack Paseuth

Hisao Shimazu

Keiichi Tsuda

Yuki Tanaka

Atsuhiro Yoneda

Masafumi Goto

Akinobu Oharuda

Takashi Murakami

Tadayuki Saito

Osamu Kobayashi

Nobuhiro Imamura

Takashi Aoi

Yumiko Amisaki

Yoshikiyo Kinoshita

Toshiaki Inoue

Yuji Hiratsuka

A cemented carbide comprising a plurality of tungsten carbide particles and a binder phase, wherein the cemented carbide comprises a total of 80% by volume or more of the tungsten carbide particles and the binder phase, the cemented carbide comprises 0.1 vol % or more and 20 vol % or less of the binder phase, the cemented carbide comprises at least one first element selected from the group consisting of boron, aluminum, silicon, iron, nickel, germanium, ruthenium, rhenium, osmium, iridium, and platinum, the cemented carbide comprises a total of 0.01 atomic % or more and 10 atomic % or less of the first element, the binder phase comprises 50% by mass or more of cobalt, the first element is segregated in a first interface region between the tungsten carbide particles adjacent to each other, and the first element is present at a C site of tungsten carbide in the first interface region.

Cemented carbide and cutting tool using the same

Provided is a cemented carbide comprising a plurality of tungsten carbide grains and a binder phase, wherein the cemented carbide comprises the tungsten carbide grains and the binder phase in a total of 89% by volume or more, the cemented carbide comprises 1.8% by volume or more and 20.0% by volume or less of the binder phase, the binder phase contains cobalt, the cemented carbide contains 1.0% by mass or more of cobalt, and a percentage (H2/H1)×100 of a hardness of the binder phase at 600° C., H2 GPa, to a hardness at 25° C., H1 GPa, as measured by a nanoindenter method is 25% or more.

Cemented carbide

Provided is a cemented carbide comprising a plurality of tungsten carbide grains and a binder phase, wherein the cemented carbide comprises the tungsten carbide grains and the binder phase in a total of 89% by volume or more, the cemented carbide comprises 1.8% by volume or more and 20.0% by volume or less of the binder phase, the binder phase contains cobalt, the cemented carbide contains 1.0% by mass or more of cobalt, and a Young's modulus of the binder phase at 25° C. is 170 GPa or more, as measured by a nanoindenter method.

Provided is a cemented carbide comprising a plurality of tungsten carbide grains and a binder phase, wherein the cemented carbide comprises the tungsten carbide grains and the binder phase in a total of 89% by volume or more, the cemented carbide comprises 1.5% by volume or more and 23% by volume or less of the binder phase, the binder phase contains 40% by mass or more of cobalt, the binder phase further contains at least one first element selected from the group consisting of silicon, phosphorus, germanium, tin, rhenium, ruthenium, osmium, iridium, and platinum, the first element is not segregated in a first interface region between the tungsten carbide grains that are adjacent to each other, and the first element is not segregated in a second interface region between the tungsten carbide grain and binder phase that are adjacent to each other.

Cemented carbide and cutting tool

A cemented carbide consists of a first hard phase, second hard phases, and a binder phase, wherein the first hard phase is composed of tungsten carbide grains, a D10 and a D90 of grain sizes of the tungsten carbide grains are 0.40 μm or more and 2.00 μm or less respectively, the second hard phases are composed of at least one first compound selected from the group consisting of TaNbC, TaNbN, TaNbCN, TiCN, TiNbC, TiNbN, and TiNbCN, the cemented carbide includes 0.30% to 1.60% by volume of the second hard phases, an average of circularities of the second hard phases is 0.10 to 0.32, a standard deviation of the circularity is 0.094 to 0.130, the binder phase includes 50% by mass or more of cobalt, and the cemented carbide includes 8.0% to 12.0% by volume of the binder phase.

A cemented carbide comprising a plurality of tungsten carbide particles and a binder phase, wherein the cemented carbide comprises a total of 80% by volume or more of the tungsten carbide particles and the binder phase, the cemented carbide comprises 0.1% by volume or more and 20% by volume or less of the binder phase, the cemented carbide comprises at least one first element selected from the group consisting of titanium, tantalum, niobium, zirconium, hafnium, and molybdenum, the cemented carbide comprises a total of 0.01 atomic % or more and 10.0 atomic % or less of the first element, the binder phase comprises 50% by mass or more of cobalt, and the first element is not segregated in a first interface region between the tungsten carbide particles adjacent to each other.

A cemented carbide comprising a plurality of tungsten carbide particles and a binder phase, wherein the cemented carbide comprises at least one first element selected from the group consisting of titanium, tantalum, niobium, zirconium, cerium, yttrium, and boron, and wherein in a first graph in a coordinate system where an X axis is a distance from a position at which cobalt exhibits a maximum intensity, and a Y axis is a normalized intensity, a maximum peak M of each of the first element is present between a peak Wof tungsten closest to an origin and a further peak Wof tungsten closest to the peak W, a ratio IB/IA of an intensity IB to a maximum peak intensity IA of the maximum peak M is more than 0.5 in each of the first element, and the intensity IB is an intensity of the first element at a distance P

A cemented carbide consisting of a first hard phase, second hard phases, and a binder phase, wherein the first hard phase is composed of tungsten carbide grains, a D10 and a D90 of grain sizes of the tungsten carbide grains are 0.40 μm and 2.00 μm respectively, the second hard phases are composed of at least one first compound selected from the group consisting of TaNbC, TaNbN, TaNbCN, TiCN, TiNbC, TiNbN, and TiNbCN, the cemented carbide includes 0.30% to 1.60% by volume of the second hard phases, a median of a distance between centroids of two of the second hard phases that are closest is 4 to 15 μm, a coefficient of variation of the distance between centroids is 1.20 to 1.90, the binder phase includes 50% by mass or more of cobalt, and the cemented carbide includes 8.0 to 14.0% by volume of the binder phase.

A cemented carbide consisting of a first hard phase, second hard phases, and a binder phase, wherein the first hard phase is composed of tungsten carbide grains, a D10 and a D90 of grain sizes of the tungsten carbide grains are 0.40 sm or more and 2.00 sm or less respectively, the second hard phases are composed of at least one first compound selected from the group consisting of TaNbC, TaNbN, TaNbCN, TiCN, TiNbC, TiNbN, and TiNbCN, the cemented carbide includes 0.30 to 1.60% by volume of the second hard phases, a median of areas of the second hard phases is 0.90 to 1.20 μm, a coefficient of variation of the areas of the second hard phases is 0.50 to 1.20, the binder phase includes 50% by mass or more of cobalt, and the cemented carbide includes 8.0 to 12.0% by volume of the binder phase.

Provided is a novel polishing composition. The polishing composition comprises a water-soluble polymer at least comprising a vinyl alcohol-based resin having a side-chain group of 3 carbon atoms or more.

Polishing composition

A cell or tissue embedding device having an aqueous gel serving as an immunoisolation layer, the aqueous gel containing, as components thereof, a denatured polyvinyl alcohol resin having an activated carbonyl group and a crosslinking agent is highly capable of supplying a physiologically active substance.

Cell or tissue embedding device

Provided is a cemented carbide comprising a plurality of tungsten carbide grains and a binder phase, wherein the cemented carbide comprises the tungsten carbide grains and the binder phase in a total of 89% by volume or more, the cemented carbide comprises 1.8% by volume or more and 20.0% by volume or less of the binder phase, the binder phase contains cobalt, the cemented carbide contains 1.0% by mass or more of cobalt, and a percentage (Y2/Y1)×100 of a Young's modulus of the binder phase at 600° C., Y2 GPa, to a Young's modulus at 25° C., Y1 GPa, as measured by a nanoindenter method is 50% or more.

A cemented carbide comprising a plurality of tungsten carbide particles and a binder phase, wherein in a first region of a first graph showing results obtained by carrying out line analysis along a first direction going from position X1 provided in the tungsten carbide particles to position X2 provided in the binder phase adjacent to the tungsten carbide particles, a distance Pat a maximum intensity Iof tungsten, a maximum distance Pshowing an intensity Iof 70% of the maximum intensity I, a distance Pat a maximum intensity Iof vanadium, a distance Pat a maximum intensity Iof chromium, a minimum distance Pshowing an intensity Iof 70% of a maximum intensity Iof cobalt, and a distance Pat the maximum intensity Ishow a relationship P<P<P<P<P<P.

A cemented carbide includes a plurality of tungsten carbide particles and a binder phase, wherein the cemented carbide comprises at least one first element selected from the group consisting of titanium, tantalum, niobium, zirconium, cerium, yttrium, and boron, and wherein in a first graph in a coordinate system where an X axis is a distance from a position at which cobalt exhibits a maximum intensity, and a Y axis is a normalized intensity, a maximum peak M of each of the first element is present between a peak Wof tungsten closest to an origin and a further peak Wof tungsten closest to the peak W, a ratio IB/IA of an intensity IB to a maximum peak intensity IA of the maximum peak M is 0.5 or less in each of the first element, and the intensity IB is an intensity of the first element at a distance P

A cemented carbide composed of a first hard phase, a second hard phase and a binder phase, in which the first hard phase is composed of tungsten carbide particles, the second hard phase is composed of at least one first compound selected from the group consisting of TiNbC, TiNbN and TiNbCN, the second hard phase has an average particle diameter of 0.25 μm or less, the second hard phase has a dispersity of more than 0.70 and 17.0 or less, the second hard phase has a content of 0.1 vol % or more and 15 vol % or less, the binder phase contains at least one first element selected from the group consisting of iron, cobalt and nickel, and the binder phase has a content of 0.1 vol % or more and 19.0 vol % or less.

Growing community of inventors

Osaka, Japan

Yoshihiro Kimura