Komaki, Japan
Komaki, Japan

NGK Insulators, Ltd. is a Japanese ceramics company. It primarily produces insulators but also produces other products, especially ceramic products. It is listed on the Nikkei 225, which is an index of the Tokyo Stock Exchange. It is also listed in the Osaka Securities Exchange, the Nagoya Stock Exchange, and the Sapporo Securities Exchange all under listing code 5333. NGK stands for Nippon Gaishi Kaisha . Wikipedia.

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There is provided a platy Mg-containing zinc oxide sintered compact containing 1 to 10 wt % Mg as a first dopant element and 0.005 wt % or more at least one second dopant element selected from the group consisting of Al, Ga and In, the balance consisting essentially of ZnO and optionally at least one third dopant element selected from the group consisting of Br, CI, F, Sn, Y, Pr, Ge, B, Sc, Si, Ti, Zr, Hf, Mn, Ta, W, Cu, Ni, Cr, La, Gd, Bi, Ce, Sr and Ba, wherein the (002)-plane or (100)-plane orientation in the plate surface is 60% or more. The Mg-containing zinc oxide sintered compact of the present invention has excellent properties such as high orientation despite solid dissolution of Mg.


Patent
Ngk Insulators | Date: 2017-01-30

There is provided a platy zinc oxide sintered compact containing 0.80 wt % or less at least one first dopant element selected from the group consisting of Al, Ga and In, the balance consisting essentially of ZnO and optionally at least one second dopant element selected from the group consisting of Br, Cl, F, Sn, Y, Pr, Ge, B, Sc, Si, Ti, Zr, Hf, Mn, Ta, W, Cu, Ni, Cr, La, Gd, Bi, Ce, Sr and Ba, the second dopant element being optional component, wherein the (002)-plane orientation in the plate surface is 60% or more. The zinc oxide sintered compact of the present invention has excellent properties such as high orientation in addition to transparency and conductivity.


Patent
Ngk Insulators | Date: 2017-02-01

A fuel cell stack (100) includes a first power generation element, a first supporting substrate (5a), a second power generation element, a second supporting substrate (5b) and a communicating member (3). The first supporting substrate (5a) includes a first substrate main portion, a first dense layer, and a first gas flow passage. The first dense layer covers the first substrate main portion. The first gas flow passage extends from a proximal end portion (501a) to a distal end portion (502a). The second supporting substrate (5b) includes a second substrate main portion, a second dense layer, and a second gas flow passage. The second dense layer covers the second substrate main portion. The second gas flow passage extends from a proximal end portion (501b) to a distal end portion (501b). The communicating member (3) extends between the distal end portion (502a) of the first supporting substrate (5a) and the distal end portion (502b) of the second supporting substrate (5b) and communicates between the first gas flow passage and the second gas flow passage.


Patent
Ngk Insulators | Date: 2017-01-27

An air electrode has a plurality of carbon nanotubes and a plurality of layered double hydroxide particles. The plurality of layered double hydroxide particles is supported on the plurality of carbon nanotubes.


Patent
Ngk Insulators | Date: 2017-05-17

Provided is a highly reliable nickel-zinc battery including a separator exhibiting hydroxide ion conductivity and water impermeability. The nickel-zinc battery of the present invention includes a positive electrode containing nickel hydroxide and/or nickel oxyhydroxide; a positive-electrode electrolytic solution in which the positive electrode is immersed, the electrolytic solution containing an alkali metal hydroxide; a negative electrode containing zinc and/or zinc oxide; a negative-electrode electrolytic solution in which the negative electrode is immersed, the electrolytic solution containing an alkali metal hydroxide; a hermetic container accommodating the positive electrode, the positive-electrode electrolytic solution, the negative electrode, and the negative-electrode electrolytic solution; and the separator exhibiting hydroxide ion conductivity and water impermeability and disposed in the hermetic container so as to separate a positive-electrode chamber accommodating the positive electrode and the positive-electrode electrolytic solution from a negative-electrode chamber accommodating the negative electrode and the negative-electrode electrolytic solution. In the nickel-zinc battery, the alkali metal hydroxide concentration of the positive-electrode electrolytic solution differs from that of the negative-electrode electrolytic solution.


Patent
Ngk Insulators | Date: 2017-05-17

Provided is a separator-equipped air electrode for a metal-air battery, the separator-equipped air electrode including a separator composed of a hydroxide-ion-conductive inorganic solid electrolyte being a dense ceramic material; an air electrode layer containing an air electrode catalyst and an electron-conductive material, or containing an air electrode catalyst also serving as an electron-conductive material; and an intermediate layer disposed between the separator and the air electrode layer, improving the adhesion between the separator and the air electrode layer, and exhibiting hydroxide ion conductivity. The present invention enables an air electrode provided with a dense ceramic separator to ensure the desired characteristics of the dense ceramic separator and reduces the resistance of a metal-air battery (in particular, the interfacial resistance between the air electrode layer and the separator).


Patent
Ngk Insulators | Date: 2017-05-17

Provided is a highly reliable nickel-zinc battery including a separator exhibiting hydroxide ion conductivity and water impermeability. The nickel-zinc battery of the present invention includes a separator exhibiting hydroxide ion conductivity and water impermeability. The separator is disposed in a hermetic container so as to separate a positive-electrode chamber accommodating a positive electrode and a positive-electrode electrolytic solution from a negative-electrode chamber accommodating a negative electrode and a negative-electrode electrolytic solution. The positive-electrode chamber has an extra positive-electrode space having a volume that meets a variation in amount of water in association with reaction at the positive electrode during charge and discharge of the battery, and the negative-electrode chamber has an extra negative-electrode space having a volume that meets a variation in amount of water in association with reaction at the negative electrode during charge and discharge of the battery. The nickel-zinc battery further includes a gas flow channel that connects the extra positive-electrode space to the extra negative-electrode space such that the spaces are in gas communication with each other.


Patent
Ngk Insulators | Date: 2017-05-17

Provided is a highly reliable nickel-zinc battery including a separator exhibiting hydroxide ion conductivity and water impermeability. The nickel-zinc battery of the present invention includes a separator exhibiting hydroxide ion conductivity and water impermeability. The separator is disposed in a hermetic container so as to separate a positive-electrode chamber accommodating a positive electrode and a positive-electrode electrolytic solution from a negative-electrode chamber accommodating a negative electrode and a negative-electrode electrolytic solution. The positive-electrode chamber has an extra positive-electrode space having a volume that meets at least part of a variation in amount of water in association with reaction at the positive electrode during charge and discharge of the battery, and the negative-electrode chamber has an extra negative-electrode space having a volume that meets at least part of a variation in amount of water in association with reaction at the negative electrode during charge and discharge of the battery. The battery further includes a gas-liquid flow channel that connects the extra positive-electrode space to the extra negative-electrode space, and the gas-liquid flow channel allows the electrolytic solution and gas in the positive-electrode and negative-electrode chambers to pass through the flow channel in response to a variation in amount of water caused by charge and discharge reactions.


Provided is a method for manufacturing a gas sensor capable of securing airtightness without a chip in a sensor element. The method includes a step of obtaining an assembled body constituting the gas sensor, including steps of: causing one end of the sensor element to abut to a positioning member for positioning the sensor element; applying a force F1 to the annularly-mounted members including a powder compact annularly mounted to the sensor element under a state that the sensor element is positioned and thereby compressing the powder compact so as to fix the sensor element inside of the tubular body; applying a force F2 larger than the force F1 to the annularly-mounted members under a state that the sensor element is not positioned and thereby further compressing the powder compact, so as to hermetically seal inside of the tubular body.


Patent
Ngk Insulators | Date: 2017-09-27

There is disclosed a plugged honeycomb structure capable of enhancing an isostatic strength and suppressing an increase in pressure loss and a decrease in capacity of deposited ash. The plugged honeycomb structure includes a honeycomb structure body 4, outflow side plugged portions, and inflow side plugged portions 5a. A shape of cells 2 in a cross section perpendicular to an extending direction of the cells 2 is a hexagonal shape. Among six corner portions 15 of each of the hexagonal cells 2, the corner portion 15 between two partition walls 1 which constitute the corner portion 15 and at least one of which is the partition wall 1 separating inflow cells 2a or outflow cells 2b from each other is a specific corner portion 15a, and the corner portion 15 between the two partition walls 1 which constitute the corner portion 15 and each of which is the partition wall 1 separating the inflow cell 2a and the outflow cell 2b is an unspecific corner portion 15b. In this case, at least one of the specific corner portions 15a is provided with a reinforcing portion 6 so that a shape of the specific corner portion 15a is rounded, and the unspecific corner portions 15b are not provided with the reinforcing portions 6.

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