A.l.m.t. Corporation

Nec Corporation

Ushio Inc.

Masahiro Katoh

Akihiko Ikegaya

Shigekazu Yamazaki

Yoshitake Fukaya

Ayuri Tsuji

Makoto Watanabe

Seiji Nakabayashi

Yasushi Aoki

Shinichi Irisawa

Takeshi Fukuyo

Yoshiharu Yamamoto

Hiroshi Yoshida

Hidenobu Nishino

Toshihiko Yoshida

Yoshihiro Wada

Norihiko Hasegawa

Shinichi c/o Koito Manufact Co Ltd Irisawa

Takeshi c/o Koito Manufact Co Ltd Fukuyo

The molybdenum crucible includes a cylindrical side wall and a bottom provided integrally with one end of the side wall. The side wall includes a coarse grain region configured to extend from an outer wall toward an inner wall and a fine grain region configured to extend from the inner wall toward the outer wall so as to be in contact with the coarse grain region. The ratio of the coarse grain region in the side wall in the thickness direction thereof is 10% or more and less than 90%. The coarse grain region is defined as such a region in which crystal grains having a grain size of 1 mm or more determined by an intercept method in the height direction of the crucible occupy 95% or more of an area of a measurement region.

Molybdenum crucible

A heat-resistant alloy that satisfies physical properties such as proof stress and hardness adapted to an increase in the melting point of a welding object compared to conventional alloys is provided. The heat resistant alloy includes a first phase, as a main component, containing a Mo or W metal phase, a second phase containing a Mo&#x2014;Si&#x2014;B&#x2014;based alloy, and a third phase containing titanium carbonitride, wherein the balance is inevitable compounds and inevitable impurities.

Heat-resistant alloy and method of manufacturing the same

A Mo&#x2014;Si&#x2014;B-based alloy for a heat-resistant alloy that satisfies, more than conventional, physical properties such as proof stress and hardness adapted to an increase in the melting point of 5 a welding object. The Mo&#x2014;Si&#x2014;B-based alloy powder is such that the full width at half maximum of (600) of Mo5SiB2 in X-ray diffraction peak data is 0.08 degrees or more and 0.7 degrees or less.

Mo&#x2014;Si&#x2014;B-based alloy powder, metal-material raw material powder, and method of manufacturing a Mo&#x2014;Si&#x2014;B-based alloy powder

An object of this invention is to provide a crucible for growing a sapphire single crystal, which is optimized for providing a sapphire single crystal and is reusable. A crucible for growing a sapphire single crystal of this invention includes: a base material () containing molybdenum as a main component and having a crucible shape; and a coating layer () with which only an inner periphery of the base material () is coated and which is formed of tungsten and inevitable impurities, in which the coating layer () has a surface roughness Ra of 5 &#x3bc;m or more and 20 &#x3bc;m or less.

Crucible for growing sapphire single crystal, and method for producing crucible for growing sapphire single crystal

Provided is a tungsten electrode material that can improve the life of an electrode than conventional by the use of a material in place of thorium oxide. The tungsten electrode material includes a tungsten base alloy and oxide particles dispersed in the tungsten base alloy, wherein the oxide particle is an oxide solid solution in which a Zr oxide and/or a Hf oxide and an oxide of at least one or more kinds of rare earth elements selected from Sc, Y, La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, and Lu are solid-dissolved.

Tungsten electrode material and thermionic emission current measuring device

An alloy for a lead member is used for an electric lamp having a metal/vitreous material interface. Molybdenum or tungsten serving as an electric lamp current conductor is used as a base for the lead member, wherein the molybdenum or tungsten contains titanium oxide or other oxides. Automotive bulbs use this alloy for a lead member.

Alloy for a lead member of an electric lamp and electrode structure of the electric lamp

A setter used in sintering and having an oxide coating layer is configured such that oxide powder of at least one of, or a mixture of oxide powders of two or more of alumina, silica, zirconia, yttria, titania, magnesia, and calcia is deposited to at least one surface of a metal composed of molybdenum, tungsten, or an alloy of a molybdenum group and a tungsten group, and a deposition surface thereof allows no exposure of the base material.

Coated refractory metal plate having oxide surface layer, and setter which uses the same and which is used in sintering

A high-pressure discharge lamp comprises a lamp tube made of quartz glass and having a central portion formed in a spherical shape, and a pair of opposing tungsten electrodes inserted into the lamp tube. At least one of the tungsten electrodes is made of a tungsten material which contains more than 10 ppm of one of Co and Ni, or 10 ppm of Co and Ni in total, or a tungsten material which contains 20 ppm or more of at least two of Fe, Co and Ni in total, or a tungsten material which contains 20 ppm or more of Fe. Fe, Co and Ni belong to iron-group metals. The inter-electrode distance, i.e., distance between the leading ends of both tungsten electrodes is set to approximately 1-2 mm or less.

Growing community of inventors

Toyama, Japan

Masahiro Katoh