Ngk Spark Plug Company, Limited

Ngk Insulators, Inc.

Yoshihiro Yamamoto

Hiroshi Tanaka

Katsura Matsubara

Akimitsu Sassa

Kenji Sakurai

Masaya Ito

Junichiro Suzuki

Toru Shimamori

Ken-ichi Mizuno

Yukio Miyairi

Hiroyuki Suzuki

Makoto Sugimoto

Kuniharu Tanaka

Nobuyuki Hotta

Masahiro Kida

Shogo Hirose

Shingo Iwasaki

Kenji Nunome

Hirohito Ito

Kazuhisa Itakura

Manabu Okinaka

Tadashi Watanabe

Hiroshi Harada

Toshiki Hirokawa

Minoru Nakamura

Iazuhisa Itakura

Tomonori Urushihara

A glow plug including a heater () having a rear heat-generating element () formed of a resistance heat-generating element, and provided in an axial region thereof between a forward end () of a housing and a rear end () of a displacement member () located rearward of the forward end (). The heat-generating element () is arranged separately from a forward heat-generating element () provided at a forward end portion of the heater.

Glow plug with combustion pressure sensor

An internal combustion engine includes a combustion chamber, a fuel injector injecting fuel into the combustion chamber, a cylinder, a piston having a crown and reciprocating in the cylinder, the crown being exposed to the combustion chamber, and an ignition delay enhancer prolonging an ignition delay of a fuel-air mixture in the combustion chamber. A ceramic member is disposed on at least a fuel injection port, to which fuel is injected from the fuel injector, of the crown of the piston.

Internal combustion engine

A glow plug includes a cylindrical housing, a rod-shaped heater, a membrane portion, and a pressure sensor. The cylindrical housing extends along an axial direction. The rod-shaped heater extending along the axial direction is displaced along the axial direction and has one end portion disposed within the housing, and an other end portion which is exposed from the housing. The membrane portion connects together the heater and the housing and has a multi-layer construction which has a first layer and a second layer of which at least part is positioned nearer to the other end portion in the axial direction of the heater than the first layer. The pressure sensor measures a pressure within a combustion chamber in which the other end portion is disposed by making use of a displacement of the heater. A thickness of the second layer is larger than a thickness of the first layer.

Glow plug

A ceramic glow plug equipped with a pressure sensor including a ceramic heater, a holding device, a housing sleeve, a housing, a movable member and a pressure sensor. A heat-generating main portion P whose resistance is 75% of the total resistance of the ceramic heater is located forward of the forward end of the holding sleeve.

Ceramic glow plug equipped with pressure sensor

There are disclosed a honeycomb structure capable of providing a honeycomb catalytic body which is excellent in purification efficiency with a small pressure loss and which can be mounted even in a limited space, a honeycomb catalytic body which is excellent in purification efficiency with a small pressure loss and which can be mounted even in a limited space, and a manufacturing method of the same. A honeycomb catalytic bodyof the present invention is a honeycomb catalytic body of a flow-through type through which cells as through channels extend from an inlet to an outlet, both the surfaces of partition wallsof a honeycomb structureand the inner surfaces of porescarry a catalyst to form catalyst layers, and the catalyst carrying partition walls have a permeability of 1&#xd7;10[m] or more, preferably 1&#xd7;10[m] or less.

Honeycomb structure, honeycomb catalytic body and manufacturing method of the same

A ceramic heater in which a damage in a joining portion between a heating portion and a lead portion is suppressed and the reliability is excellent is provided. In a ceramic heater () including: a rod-shaped support () which is made from an insulative ceramic; and a resistor member () including a heating portion () embedded in a tip end part of the support (), and a pair of lead portions () which extend from the heating portion () toward a rear end side of the support (), the heating portion () and the lead portions () are made from the same conductive ceramic.

Ceramic heater, method of producing the same, and glow plug using a ceramic heater

An insulator for spark plug comprises an alumina-based sintered body comprising: Al O as a main component; and at least one component (hereinafter referred to as &ldquo;&bgr; component&rdquo;) selected from the group consisting of Ca component, Sr component and Ba component, wherein the alumina-based sintered body comprises particles comprising a compound comprising the &bgr; component and Al component, the compound having a molar ratio of the Al component to the &bgr; component of 4.5 to 6.7 as calculated in terms of oxides thereof, and has a relative density of 90% or more.

Alumina-based sintered body insulator for spark plugs

A homogeneous alumina-based sintered material having excellent grindability, low porosity and high flexural strength, and which is free of color unevenness and fluctuations in density. Predetermined amounts of Al.sub.2 O.sub.3 powder, MgO powder, CaCO.sub.3 powder and SiO.sub.2 powder are measured out, and then mixed with stirring in a ball mill. The mixture is granulated using a spray dryer, and then hydrostatically pressed to obtain a molded product having a predetermined shape. Subsequently, the molded product is stored and sintered at a temperature of 1,550.degree. C. to 1,650.degree. C., particularly 1,600.degree. C. to 1,650.degree. C. under atmospheric pressure for 2 hours. As a result, an alumina-based sintered material having a 50 percent cumulative grain size distribution in diameter of from 4 to 15 .mu.m, a 90 percent grain diameter of two to three times the 50 percent grain diameter, and a porosity of not more than 5% can be obtained. The alumina-based sintered material thus obtained exhibits a maximum load current during grinding of not more than 1.0 A/mm, particularly not more than 0.5 A/mm, and a four-point flexural strength of not less than 300 MPa, thus providing excellent grindability as well as high strength.

Alumina-based sintered material

Disclosed is an alumina-based sintered material comprising a magnesium component, a calcium component, a silicon component, and a lithium component, wherein the content of the lithium component in terms of oxide amount is from 0.002 to 0.04% by weight based on the alumina-based sintered material.

Alumina-based sintered materials and process for producing the same

A titanium nitride base cermet with high toughness comprises, by weight, 42 to 95% of TiN, 2 to 20% of one or more of Mo, W and the carbides thereof, 2.85 to 30% of an Ni, Co or a mixture thereof, and 0.15 to 8.0% of Al.sub.4 C.sub.3, with the balance being inevitable impurities, wherein half or less of TiN may be replaced with one or more of the carbides and/or carbonitrides of metals from the Groups IVa and Va of the periodic table, with the proviso that the amount of TiN is no less than 30% in the cermet.

Titanium nitride base cermets with high toughness

Ceramic materials for cutting tools are described, comprising molding a powder mixture comprising (a) Al.sub.2 O.sub.3, (b) TiN, and (c) at least one of ZrC, Zr, and ZrN, wherein component (a) constitutes between 25 and 80% of the total volume of the powder mixture and the volume ratio of component (c) to component (b) is 1/2 or less, and sintering the molded powder in vacuum or in an inert atmosphere. A process for production thereof is also described.

Ceramic material for cutting tools and process for the production thereof

A process for producing titanium nitride base cermet with a high toughness comprises the steps of:

Process for producing titanium nitride base cermets with high toughness

A process for producing an alumina sintered product is disclosed wherein the starting alumina mixture contains about 0.01 to 0.55% by weight of MgO and 0.5 to 5.5% by weight of Y.sub.2 O.sub.3. The process yields a sintered product having a porosity on the order of less than 0.1% by volume and an average crystal grain size of about 2 microns or less and is particularly suitable for use in high speed microfinish cutting.

Alumina sintered products and process for their production

A sintered ceramics for cutting tools having a relative apparent density of not less than 98% is obtained by sintering a mixture substantially consisting of 80-95% by volume alumina and the balance of titanium nitride and Zr-containing component(s) such as Zr, ZrC and/or ZrN wherein the volumetric ratio of TiN /Zr-containing component(s) ranges 95/5-50/50 in vacuum and/or vacuum inert atmosphere. Although the present invention does not need any application of hot pressing or HIP process, the resultant ceramics has an improved abrasion resistance comparable to those obtained by the latter processes.

Sintered ceramics for cutting tools and manufacturing process thereof

A sintered ceramic body for use in cutting tools which has an average crystal grain size of not more than about 2.mu. and comprises about 60 to 95% by volume of (a) Al.sub.2 O.sub.3 and the remainder being composed of (b) WC, provided that it may contain W.sub.2 C in which case the intensity ratio I.sub.W.sbsb.2.sub.C (101)/I.sub.WC (111) in X-ray diffraction using CuK.alpha. rays is not more than about 0.5, and (c) TiN, the volume ratio of components (b) to (c) being about 5:95 to 95:5.

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Kitanagoya, Japan

Yoshihiro Yamamoto