Sumitomo Electric Industries, Limited

A.l.m.t. Corporation

Masato Michiuchi

Keiichi Tsuda

Kosuke Fukae

Katsumi Okamura

Takehiko Hayashi

Takayuki Fudo

Yoshihiro Minato

Takamasa Onoki

Akito Ishii

Takato Yamanishi

Akihide Matsumoto

Kentaro Chihara

Tomoyuki Ishida

Nobuhide Nakamura

Kei Hirai

Hiroaki Gotou

Masahiro Ohata

A coated super-abrasive grain comprises: a body composed of cubic boron nitride; and a coating film coating at least a portion of a surface of the body, the body having a dislocation density of 9×10/mor less, the coating film including one or more types of compounds composed of at least one type of element selected from the group consisting of a group 4 element, a group 5 element and a group 6 element of the periodic table, aluminum and silicon, and at least one type of element selected from the group consisting of oxygen, nitrogen, carbon, and boron.

Coated super-abrasive grains, abrasive grains, and wheel

Cemented carbide contains first hard-phase particles containing WC, second hard-phase particles which contain carbonitride containing at least Ti and Nb, and a metallic binder phase containing an iron-group element. The second hard-phase particle includes a granular core portion. The core portion contains composite carbonitride expressed as TiNbWCN, where X is not smaller than 0.1 and not greater than 0.2, Y is not smaller than 0 and not greater than 0.05, and Z is not smaller than 0.3 and not greater than 0.6. The cemented carbide has an absolute value of a difference not greater than 10, between a ratio (%) of an area occupied by the second hard-phase particles at a surface thereof and a ratio (%) of an area occupied by the second hard-phase particles in a region extending from the surface by 0.5 mm in a direction of depth.

Cemented carbide, cutting tool containing the same, and method of manufacturing cemented carbide

A tungsten carbide powder contains tungsten carbide as a main component and chromium, in which, when mass concentrations of tungsten and chromium are measured at 100 or more analysis points randomly selected from a field of view of SEM observation of the tungsten carbide powder, a standard deviation &#x3c3; of distribution of the ratio by percentage of the concentration of chromium to the total concentration of tungsten and chromium is 0.5 or less.

Tungsten carbide powder and production method therefor

A tungsten carbide powderincludes bonded bodieseach including a plurality of tungsten carbide crystal grains, in which the bonded bodiesinclude, at a grain boundarybetween the plurality of tungsten carbide crystal grains, a chromium-concentrated regionwhich has a chromium concentration higher than that in the tungsten carbide crystal grains

Tungsten carbide powder

A titanium carbonitride powder for use as a starting material for a hard material satisfies a D50 of from 2.0 &#x3bc;m to 6.0 &#x3bc;m and a D10/D90 of from 0.20 to 0.50, wherein D50 is a particle size at a cumulative percentage of 50% of a particle size distribution by volume, D10 is a particle size at a cumulative percentage of 10% of the particle size distribution by volume, and D90 is a particle size at a cumulative percentage of 90% of the particle size distribution by volume.

Titanium carbonitride powder and method for manufacturing titanium carbonitride powder

A hard material includes a first hard phase containing titanium carbonitride as a major constituent and a binder phase containing an iron group element as a major constituent. In any surface or cross-section of the hard material, the grain size D50 at a cumulative percentage of 50% of a grain size distribution by area of the first hard phase is 1.0 &#x3bc;m or more, and the average aspect ratio of first hard phase particles having grain sizes larger than or equal to D50 is 2.0 or less.

Hard material and cutting tool

Cemented carbide contains first hard-phase particles containing WC, second hard-phase particles which contain carbonitride containing at least Ti and Nb, and a metallic binder phase containing an iron-group element. The second hard-phase particle includes a granular core portion and a peripheral portion which covers at least a part of the core portion. The core portion contains composite carbonitride expressed as TiNbWCN, where Y is not smaller than 0 and not greater than 0.05 and Z is not smaller than 0.3 and not greater than 0.6. The peripheral portion is different in composition from the core portion.

A complex carbonitride powder contains Ti as a main component element and at least one additional element selected from the group consisting of Zr, Hf, V, Nb, Ta, Cr, Mo, W, Al, and Si. The complex carbonitride powder includes a plurality of complex carbonitride particles containing Ti and the additional element. The plurality of complex carbonitride particles include a plurality of homogeneous composition particles where average concentrations of Ti and the additional element in each complex carbonitride particle have a difference in a range of greater than or equal to &#x2212;5 atom % and less than or equal to 5 atom % from average concentrations of Ti and the additional element in the whole complex carbonitride powder. A cross-sectional area of the homogeneous composition particles is greater than or equal to 90% of a cross-sectional area of the complex carbonitride particles

Complex carbonitride powder and method for producing same

A hard alloy includes complex carbonitride hard phases that contain Ti and at least one additional element, and a metal binder phase containing an iron group element as a main component element. The complex carbonitride hard phases include homogeneous composition hard phases where in-complex carbonitride hard phase average concentrations of Ti and the additional element have a difference of greater than or equal to &#x2212;5 atom % and less than or equal to 5 atom % from average concentrations of Ti and the additional element in all the complex carbonitride hard phases. On any cross section specified in the hard alloy, a cross-sectional area of the homogeneous composition hard phases accounts for greater than or equal to 80% of a cross-sectional area of the complex carbonitride hard phases, and the homogeneous composition hard phases account for greater than or equal to 80% of the complex carbonitride hard phases in number.

Hard alloy and cutting tool

A cermet contains hard phase particles containing Ti and a binding phase containing at least one of Ni and Co, and 70% or more (by number) of the hard phase particles have a cored structure containing a core and a peripheral portion around the core. The core is composed mainly of at least one of Ti carbide, Ti nitride, and Ti carbonitride, and the peripheral portion is composed mainly of a Ti composite compound containing Ti and at least one selected from W, Mo, Ta, Nb, and Cr. The core has an average particle size &#x3b1;, the peripheral portion has an average particle size &#x3b2;, and &#x3b1; and &#x3b2; satisfy 1.1&#x2266;&#x3b2;/&#x3b1;&#x2266;1.7.

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Itami, Japan

Masato Michiuchi