Toshiba Tungaloy Co., Ltd.

International Business Machines Corporation

Kozo Kitamura

Masaki Kobayashi

Satoshi Kinoshita

Mitsuo Ueki

Takeshi Saito

Keiichi Kobori

Takeshi Saitoh

Disclosed are a plate-crystalline tungsten carbide-containing hard alloy which comprises 4 to 40% by volume of a binder phase containing at least one of iron group metals selected from Co, Ni and Fe as a main component; and the balance of a hard phase comprising tungsten carbide alone, or tungsten carbide and 50% by volume or less of a compound with a cubic structure selected from at least one of carbide and nitride of the 4a (Ti, Zr and Hf), 5a (V, Nb and Ta) or 6a (Cr, Mo and W) group element of the periodic table and mutual solid solutions thereof, and inevitable impurities, wherein when peak intensities at a (001) face and a (101) face in X-ray diffraction using K.alpha. rays with Cu being a target are represented by h(001) and h(101), respectively, the tungsten carbide satisfies h(001)/h(101) .gtoreq.0.50, a composition for forming a plate-crystalline tungsten carbide, and a process for preparing the plate-crystalline tungsten carbide-containing hard alloy.

Plate-crystalline tungsten carbide-containing hard alloy, composition

Disclosed are a plate-crystalline tungsten carbide-containing hard alloy which comprises 4 to 40% by volume of a binder phase containing at least one of iron group metals selected from Co, Ni and Fe as a main component; and the balance of a hard phase comprising tungsten carbide alone, or tungsten carbide and 50% by volume or less of a compound with a cubic structure selected from at least one of carbide and nitride of the 4a (Ti, Zr and Hf), 5a (V, Nb and Ta) or 6a (Cr, Mo and W) group element of the periodic table and mutual solid solutions thereof, and inevitable impurities,

An online handwritten character recognition system which performs the narrowing of candidates for handwritten character recognition quickly and very accurately by simple processing of a small amount of operations. A predetermined characteristic amount is extracted for each stroke, a characteristic amount word is created having a binary value of 1 only in one or more bit positions corresponding to selected values of the characteristic amount, an AND operation is performed bit-by-bit between the reference word of the corresponding stroke of the character of interest, and it is determined if all the bits of the results of the AND operation are zero. If the number of binary values of the results of the zero-determining operation for all the strokes of the character of interest exceeds a threshold, it is judged to be a candidate.

Online handwritten character recognition

Disclosed are a high toughness cermet comprising a sintered alloy comprising 75 to 95% by weight of a hard phase of carbide, nitride or carbonitride containing Ti, at least one of W, Mo and Cr, and N and C, and the balance of a binder phase composed mainly of an iron group metal, and inevitable impurities,

High toughness cermet and process for preparing the same

There are disclosed a high strength nitrogen-containing cermet which comprises 7 to 20% by weight of a binder phase composed mainly of Co and/or Ni, with the balance being a hard phase composed mainly of TiC, TiN and/or Ti(C,N) and inevitable impurities, wherein the hard phase comprises 35 to 59% by weight of Ti, 9 to 29% by weight of W, 0.4 to 3.5% by weight of Mo, 4 to 24% by weight of at least one of Ta, Nb, V and Zr, 5.5 to 9.5% by weight of N and 4.5 to 12% by weight of C; and a process for preparing the same which comprises via the formulating, mixing, drying, molding and sintering steps of Co and/or Ni powder, at least one powder of TiC, Ti(C,N) and TiN, WC powder, Mo and/or Mo.sub.2 C, and at least one powder of carbides of Ta, Nb, V and Zr, wherein the sintering step is carried out by elevating the temperature up to 1350.degree. C. in vacuum, with the nitrogen atmosphere being made 1 torr at 1350.degree. C., increasing gradually the partial nitrogen pressure along with temperature elevation from 1350.degree. C. to the sintering temperature, with the nitrogen atmosphere being made 5 torr at the sintering temperature.

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Kawasaki, Japan

Kozo Kitamura