Mitsubishi Electric Corporation

Motoki Masaki

Kenji Mimura

Takashi Nishimura

Kei Yamamoto

Seiki Hiramatsu

Fumiaki Baba

Sohei Samejima

Hiromi Ito

Hiroki Shiota

Kazuhiro Tada

Takahiro Mabuchi

Shinya Tokizaki

Atsuko Fujino

Xiaohong Yin

Hideki Takigawa

Katsuya Jinno

Mariko Takahara

Yurie Nakamura

Azusa Osawa

A radiator includes a heat radiation ceramic material. The heat radiation ceramic material includes a first metal oxide as a principal component, the first metal oxide being a metal oxide having a wurtzite crystal structure; and a second metal oxide as a metal oxide having an average emissivity higher than or equal to 70% in a wavelength range of 3 μm to 25 μm inclusive. At least one of a trivalent metal-doped metal oxide where some metal atoms of the first metal oxide are substituted with trivalent metal atoms and a monovalent metal-doped metal oxide where some metal atoms of the first metal oxide are substituted with monovalent metal atoms is included as the second metal oxide.

Radiator and heat sink

A radio wave absorber includes hexagonal ferrite particles and a holding material-filled with the hexagonal ferrite particles. The hexagonal ferrite particles include first particles and second particles that are larger than the first particles in particle size.

Radio wave absorber

In a vacuum valve, as a heat dissipation structure thereof, a heat dissipation layer is provided to a part of the surface of each of a fixed conductor and a movable conductor which are a heat generation part, and a radiation heat absorption layer is provided to an insulation cylinder so as to be opposed to the heat dissipation layer. The heat dissipation layer and the radiation heat absorption layer are each formed from a ceramic having a high emissivity. Heat generated at the fixed conductor and the movable conductor is radiated by the heat dissipation layer, to be absorbed by the radiation heat absorption layer, and then radiated to the outside of the vacuum valve from the radiation heat absorption layer and a ceramic layer.

Heat dissipation structure, manufacturing method therefor, and vacuum valve

A thermosetting resin composition of the present disclosure includes an epoxy resin () containing a curing agent, and inorganic particles () having a rutile-type crystal structure and an average particle diameter of 500 nm or less. Further, a stator coil of the present disclosure includes a coil conductor (), and an insulating layer () obtained by winding an insulating tape around the coil conductor (), impregnating the insulating tape with the thermosetting resin composition, and molding the impregnated insulating tape by heating and pressurizing. In addition, a rotating electric machine of the present disclosure includes a stator core () having a slot (), in which the stator coil () is accommodated. According to the present disclosure, it is possible to obtain a thermosetting resin composition capable of achieving improvement in machine life through suppression of partial discharge and miniaturization and high output of the machine through improvement of a dielectric-breakdown electric field property, a stator coil obtained through use of the thermosetting resin composition, and a rotating electric machine.

Thermosetting resin composition, stator coil obtained using same, and rotating electric machine

A thermosetting resin composition containing a thermosetting resin and an inorganic filler, in which the inorganic filler contains secondary sintered particles (A) formed of primary particles of boron nitride, which have an aspect ratio of 10 to 20, and secondary sintered particles (B) formed of the primary particles of boron nitride, which have an aspect ratio of 2 to 9. The thermosetting resin composition can produce a thermal conductive sheet that has excellent filling property of the inorganic filler, and excellent thermal conductivity, adhesiveness and electrical insulating properties.

Thermosetting resin composition, method of producing thermal conductive sheet, and power module

Provided is a thermosetting resin composition including an inorganic filler and a thermosetting resin matrix component, in which the inorganic filler includes secondary sintered particles each formed of primary particles of scaly boron nitride, and at least some of the secondary sintered particles each have a maximum cavity diameter of 5 &#x3bc;m to 80 &#x3bc;m. The thermosetting resin composition can be used for providing a heat conductive sheet in which electrical insulation property is kept by controlling where the defects such as voids and cracks occur and their size, and which has excellent heat conductivity.

Thermosetting resin composition, B-stage heat conductive sheet, and power module

Provided is a heat conductive sheet obtained by dispersing an inorganic filler in a thermosetting resin, in which the inorganic filler contains secondary aggregation particles formed by isotropically aggregating scaly boron nitride primary particles having an average length of 15 &#x3bc;m or less, and the inorganic filler contains more than 20 vol % of the secondary aggregation particles each having a particle diameter of 50 &#x3bc;m or more. The heat conductive sheet is advantageous in terms of productivity and cost and excellent in heat conductivity and electrical insulating properties.

Growing community of inventors

Chiyoda-ku, Japan

Motoki Masaki