Ngk Spark Plug Company, Limited

Niterra Co., Ltd.

Ntk Cutting Tools Co., Ltd.

Takeshi Mitsuoka

Kuniharu Tanaka

Yusuke Katsu

Jun Moteki

Toshitaka Honda

Hirokazu Kurono

Katsuya Takaoka

Hiroki Takeuchi

Yasuyuki Okimura

Tsuneyuki Ito

Satoshi Teramoto

Katsuya Yamagiwa

Masato Yamazaki

Masaki Onkawa

Shohei Takaku

Shinji Ban

Kazushige Ohbayashi

Yutaka Yokoyama

Yoshihito Ikai

Toru Iwano

Hiroshi Yamamoto

Hiroshi Watanabe

Hironori Uegaki

Takio Kojima

Ryuji Inoue

Norihiko Nadanami

Kazuhiro Urashima

Satoshi Iio

Seiji Oya

Kengo Fujimura

Takayuki Matsuoka

Takashi Kasashima

Yukihiro Hamaguchi

Masayuki Segawa

Yutaka Sekiguchi

Tomohiro Hirata

Yosuke Yatsuya

Shigehiro Otsuka

Yoshihito Mizoguchi

Kohei Ito

Shinsuke Ito

Youichi Hattori

Taku Hirano

Koji Funaki

Yasuhiro Fujii

Toshiyuki Sakurai

Yuki Shimura

Syohei Takaku

Yoshito Kojima

Sigehiro Otsuka

Yoshihiro Kuroki

Hironobu Kusanagi

Hiroshi Yonekura

Hiroshi Watanbe

Yasayuki Okimura

Kazunari Miyata

Hideaki Hiramitsu

Manabu Horiguchi

Ryotaro Tawara

Eiji Miura

Katsu Yusuke

Saori Narita

Okimura Yasuyuki

An optical wavelength converter () is configured such that an optical wavelength conversion member () is bonded to a heat dissipation member () having superior heat dissipation property. Thus, heat generated by light incident on the optical wavelength conversion member () can be efficiently dissipated. Therefore, even when high-energy light is incident on the optical wavelength converter, temperature quenching is less likely to occur, and thus high fluorescence intensity can be maintained. An intermediate film () is disposed between a reflective film () and a bonding portion (). The presence of the intermediate film () improves the adhesion between the reflective film () and the bonding portion (), thereby enhancing the heat dissipation from the optical wavelength conversion member () to the heat dissipation member (). Thus, the temperature quenching of the optical wavelength conversion member () can be prevented, thereby enhancing fluorescence intensity.

Optical wavelength converter and composite optical device

Provided is a ceramic sintered body having high wear resistance and chipping resistance. Also provided are an insert, a cutting tool and a friction stir welding tool, each of which uses such a high-performance ceramic sintered body. The ceramic sintered body includes AlO(alumina), WC (tungsten carbide) and ZrO(zirconia), wherein Zr (zirconium) element is present at either one or both of: (1) a grain boundary between crystal grains of the AlO; and (2) a grain boundary of crystal grains of the AlO and crystal grains of the WC, wherein the ceramic sintered body contains 55.0 to 97.5 vol % of the WC, 0.1 to 18.0 vol % of the ZrO, and the balance being the AlO, and wherein the ZrOis in a phase of tetragonal structure (T) or a mixed phase of tetragonal structure (T) and monoclinic structure (M).

Ceramic sintered body, insert, cutting tool, and friction stir welding tool

A method for producing an optical wavelength conversion member () composed of a sintered body containing, as main components, AlOand a component represented by formula ABO:Ce; an optical wavelength conversion member; an optical wavelength conversion component including the optical wavelength conversion member; and a light-emitting device including the optical wavelength conversion member or the optical wavelength conversion component. The production method of the sintered body includes firing in a firing atmosphere having a pressure of 10Pa or more and an oxygen concentration of 0.8 vol. % or more and less than 25 vol. %.

Method for producing light wavelength conversion member, light wavelength conversion member, light wavelength conversion component and light emitting device

An optical wavelength conversion member and a light-emitting device including the optical wavelength conversion member. The light-emitting device () includes a container (), a light-emitting element (), and an optical wavelength conversion member (). The optical wavelength conversion member () is composed of a polycrystalline ceramic sintered body containing, as main components, AlOcrystal grains and crystal grains of a component represented by formula ABO:Ce. Specifically, A and B of the ABOindividually represent at least one element selected from the following element groups: A: Sc, Y, and lanthanoids (except for Ce), and B: Al and Ga; the at least one element selected from the element groups is present in each crystal grain and the crystal grain boundary of the ceramic sintered body; and the element concentration of the crystal grain boundary is higher than the element concentration of the crystal grain.

Light wavelength conversion member and light emitting device

The durability of a ceramic sintered body is improved, and a reduction in its light emission intensity and the occurrence of a chromaticity variation are suppressed. The ceramic sintered body contains alumina and a compound represented by M1M2M3O. The volume percent of the compound in the ceramic sintered body is from 3% to 70% inclusive. The ratio of the intensity of XRD from a complex oxide of aluminum and M2 to the intensity of XRD from the compound in the ceramic sintered body is less than 0.05. The average grain diameter of the alumina contained in the ceramic sintered body is from 0.30 (&#x3bc;m) to 3.00 (&#x3bc;m) inclusive. M1 is at least one selected from Sc, Y, and lanthanoid elements, and M2 is at least one selected from lanthanoid elements except any lanthanoid element selected for M1. M3 is at least one of Al and Ga, and X is from 0.003 to 0.500 inclusive.

Ceramic sintered body

An optical wavelength conversion member and a light-emitting device including the optical wavelength conversion member. The optical wavelength conversion member () is formed of a ceramic sintered body having a fluorescent phase containing fluorescent crystal grains as a main component and a translucent phase containing translucent crystal grains as a main component. Crystal grains of the fluorescent phase have a composition represented by formula ABO:Ce, where the element A is selected from Sc, Y, and lanthanoids (except for Ce), and the element B is selected from Al and Ga. In the optical wavelength conversion member (), 0.3&#x3c;a&#x3c;34 and 300 &#x3bc;m&#x3c;y&#x3c;1,050 &#x3bc;m are satisfied, wherein a represents the area ratio of the translucent phase to the fluorescent phase in a cross section of the optical wavelength conversion member (), and y represents the interfacial length of the fluorescent phase.

Optical wavelength conversion member and light-emitting device

An optical wavelength conversion member including a polycrystalline ceramic sintered body containing, as main components, AlOcrystal grains and crystal grains of a component represented by formula ABO:Ce, wherein A is at least one element selected from Sc, Y and lanthanoids (except for Ce), and B is at least one element selected from Al and Ga. Further, the following relations are satisfied: 0%&#x2264;X&#x2264;25%, 9%&#x2264;Y&#x2264;45%, and 48%&#x2264;Z&#x2264;90%, wherein X represents a proportion corresponding to the ratio a/N, Y represents a proportion corresponding to the ratio b/N, and Z represents a proportion corresponding to the ratio c/N and a, b, c and N are as defined herein. Also disclosed is a light-emitting device including the optical wavelength conversion member.

Light wavelength conversion member and light emission device

In a ceramic composition mainly composed of alumina (AlO), tungsten carbide (WC) and zirconia (ZrO), zirconium (Zr) is distributed in a first grain boundary as an interface where an alumina (AlO) crystal grain is adjacent to a tungsten carbide (WC) crystal grain and in a second grain boundary as an interface where two alumina (AlO) crystal grains are adjacent to each other.

Ceramic composition and cutting tool

A spark plug including an insulator containing an Al component, in terms of oxides, 89 mass % or more and a Ti component, in terms of oxides, more than 0 mass % and 0.2 mass % or less, characterized in that the insulator is formed of an alumina-based sintered material which contains, in a grain boundary phase present between alumina crystal grains, a first crystal phase containing at least one species selected from among an La component, an Nd component, a Pr component, a Y component, an Er component, a Yb component, and an Lu component, and a second crystal phase containing at least one species of Group 2 element components, an Al component and an Si component.

Spark plug

A gas sensor element and a gas sensor incorporating the gas sensor element. The gas sensor element () includes a detection portion () including a solid electrolyte body () and a pair of electrodes () and () disposed on the solid electrolyte body; and a porous protection layer () covering the detection portion. The porous protection layer includes an inner porous layer () and an outer porous layer (). The inner porous layer has a higher porosity than the outer porous layer. Further, the inner porous layer contains, as main components, ceramic particles (), and ceramic fiber filaments (), and the amount of the ceramic fiber filaments is 25 to 75 vol % based on the total amount of the ceramic particles and the ceramic fiber filaments taken as 100 vol %.

Gas sensor element and gas sensor

A ceramic heater elementincludes an insulating substrate, and a heating resistorembedded in the insulating substrate. The insulating substratecontains a main phase formed of &#x3b2;-SiAlON or a multiphase SiAlON of &#x3b2;-SiAlON and &#x3b1;-SiAlON; a grain boundary phase containing a rare earth element; and a silicide of at least one species selected from among Cr, W, Mo, V, and Fe. The heating resistorcontains a main phase formed of an electrically conductive compound containing at least one species selected from among silicide, nitride, and carbide of Mo, and silicide, nitride, and carbide of W; &#x3b2;-SiAlON or a multiphase SiAlON of &#x3b2;-SiAlON and &#x3b1;-SiAlON; and a grain boundary phase containing a rare earth element.

Ceramic heater element, ceramic heater, and glow plug

A gas sensor element () including a detection portion () including a solid electrolyte body () and a pair of electrodes () and () disposed on the solid electrolyte body; and a porous protection layer () covering the detection portion. The porous protection layer includes an inner porous layer () and an outer porous layer (); the inner porous layer is higher in porosity than the outer porous layer; the inner porous layer contains, as main components, ceramic particles (), and ceramic fiber filaments () which are mainly formed of a ceramic material and which have a mean fiber length of 70 to 200 &#x3bc;m; and the amount of the ceramic fiber filaments is 25 to 75 vol % on the basis of the total amount of the ceramic particles and the ceramic fiber filaments, the total amount being taken as 100 vol %.

Gas sensor element, and gas sensor

An insulator for spark plug with a main constituent of alumina and containing silicon includes a grain boundary phase positioned between alumina particles. The grain boundary phase contains: a group 2A element; a rare earth element; and at least one kind of zirconium, titanium, chrome, niobium, manganese, and iron (a first element). Assuming that a total amount of the rare earth element is X (mass %), a total amount of the group 2A element is Y (mass %), and a total amount of the first element is Z (mass %), the following are met:0.40&#x2266;20.10&#x2266;0.40.

Insulator for spark plug and spark plug

A gas sensor element () includes a laminate of a detection element () and a heater (), and a porous protection layer () covering a forward end portion thereof. The laminate has a measuring chamber () into which a gas-to-be-measured is introduced via a diffusion resistor (). The porous protection layer includes an inner porous layer (), and an outer porous layer (). The inner porous layer has a higher porosity than the outer porous layer and the diffusion resistor. As viewed in a plurality of 100 &#x3bc;m&#xd7;100 &#x3bc;m regions ato aand bto bon sections of the inner porous layer and the diffusion resistor, respectively, a pore diameter greater than the greatest pore diameter Cin the regions of the diffusion resistor exists in each of the regions of the inner porous layer.

There is provided a gas sensor element for detecting the concentration of a specific gas component in gas under measurement, which includes a plate-shaped element body and a porous protection layer. The element body has, at one end portion thereof, a gas sensing portion formed with a solid electrolyte substrate and a pair of electrodes. The porous protection layer has a porous structure formed of ceramic particles and surrounds at least the circumference of the one end portion of the element body. In the present invention, the porous protection layer has an inner region, an intermediate region and an outer region laminated together in order of mention from the element body toward the outside. The intermediate region has a porosity lower than those of the inner and outer regions. There is also provided a gas sensor with such a gas sensor element.

Growing community of inventors

Konan, Japan

Takeshi Mitsuoka