Kabushiki Kaisha Riken

Yunzhi Gao

Akira Kunimoto

Masaharu Hasei

Yongtie Yan

Junichi Takahashi

Takashi Ono

Yukio Nakanouchi

Gyo Muramatsu

Norio Miura

Hideyuki Kurosawa

Toshikatsu Hayashi

Noboru Yamazoe

Ryo Hirabayashi

Tadahiko Watanabe

Ayako Fujie

Jun Satou

Ryo Obara

Tetsuji Miyashita

An oil ring for an internal combustion engine is provided that can prevent adhesion and deposition of oil sludge even during long-time operation of the engine, can thereby prevent the occurrence of sticking of the oil ring components to each other, and can maintain a good oil control function. At least part of the surface of the oil ring for an internal combustion engine is coated with a metal coating having a surface free energy of 40 mJ/mor less and a hydrogen bonding strength of 1.0 mJ/mor less. A coating of Ni, Cu, or an alloy containing Ni or Cu is used as the metal coating.

Oil ring for internal combustion engine

An engine part coated with an engine-parts-coating composition comprising (i) at least one of a polyfluoroalkyl group and a polyfluoropolyether group, (ii) an organopolysiloxane group, and (iii) an alkoxysilyl group.

Coating composition for engine parts and engine part comprising it

A fuel cell separator having excellent corrosion resistance, electric conductivity and durability comprising a substrate made of austenitic stainless steel, and a nitride layer formed on a surface of the substrate in contact with an oxygen electrode or a current collector on the oxygen electrode side, the nitride layer comprising a solid solution compound phase composed of an FeN crystal, in which part of Fe is substituted by at least Cr and Ni.

Separator for fuel cell with austenitic stainless steel substrate

A low-cost solid polymer electrolyte fuel cell unit including a metal separator is provided. The cell unit has a structure that may have high corrosion resistance and durability. The solid polymer electrolyte fuel cell unit includes a polymer electrolyte membrane, a pair of gas-diffusible electrodes fixed at opposing surfaces of the polymer electrolyte membrane, a pair of gas-diffusible porous conductive graphite collectors fixed in contact with the outer sides of the electrodes; a pair of aluminum separators for introducing a fuel gas and an oxygen-containing gas to the electrodes separately from one another, and porous conductive buffer layers provided between the separator and the graphite collector, and having flexibility and air permeability. The separator surfaces in contact with the buffer layers are each provided with a conductive coating having a thickness in the range from 0.01 &#x3bc;m to 20 &#x3bc;m.

Solid polymer electrolyte fuel cell unit

A bipolar current collector separator for a fuel cell composed of a metal plate having flow channels and contact faces that come into contact with electrodes or collectors, wherein a corrosion-resistant layer such as an anodized aluminum layer and a heat-resistant polymer layer is disposed on each of the flow channels.

Embossed current collector separator for electrochemical fuel cell

A gas sensor for measuring concentration of a gas component in a measured gas, including a solid electrolytic substrate and at least two electrodes fixed to the substrate. At least a first electrode of the electrodes is disposed in the environment of the measurement gas, at least one of electrodes is polarized by applying a bias current or bias voltage, and a change in the potential of the polarized electrode is measured to thereby measure the concentration of the target gas.

Measuring NOx concentration

A combined gas sensor of the invention is equipped with a second oxygen sensing electrode active only to oxygen, which is disposed on a solid electrolyte substrate such that it is directly exposed to detection gases. Sensor disorder is detected by measuring an electromotive force (signal output ) generated between a reference electrode and the second oxygen sensing electrode as an oxygen concentration in an exhaust gas atmosphere, and comparing and judging the detected result with a signal output corresponding to an electromotive force between a first oxygen sensing electrode and the sit reference electrode , or with a signal output of an oxygen pump current.

Composite sensor

A nitrogen oxide sensor enabled to enhance the measurement concentration of a total of nitrogen oxides by oxidizing or reducing the nitrogen oxides on the surfaces of electrodes in addition to the control of an oxygen concentration by an oxygen pump. An electrode (,) in a gas chamber (,) constructing an oxygen pumping portion (,) is made of a material (e.g., Pt-3 wt % Rh) having a function to oxidize a nitrogen oxide gas.

Nitrogen oxide sensor

A nitrogen oxide sensor includes a solid electrolytic substrate exhibiting oxygen ion conductivity, a noble-metal reference electrode, which is active only to oxygen, formed on one side of the solid electrolytic substrate, and a sensing electrode, which is active to NOx and oxygen, formed on the opposite side of the solid electrolytic substrate. A potential difference across the sensing electrode and the reference electrode is output as a signal indicative of NOx concentration. Nitrogen oxides in a gas to be examined or measured gas are converted to NO,and to peroxides of nitrogen such as N,O,and NO,, after which the nitrogen oxides in the gas to be examined or measured gas are sensed by the sensing electrode as the peroxides of nitrogen such as N,O,and NO,or as a mixed gas of NO,and the peroxides of nitrogen.

Growing community of inventors

Kumagaya, Japan

Yunzhi Gao