Hitachi Metals, Ltd.

Yasuo Sawano

Hideko Fukushima

Tsutomu Iimura

Ryoichi Shibata

Katsuhiko Kojo

Yoshikazu Nishikawa

Kiyoshi Kinugawa

Seigo Kanba

Tadashi Aihara

Takashi Miyaji

A sintered ceramic composite comprising 35 to 80 wt. % of aluminum nitride, 2 to 60 wt. % of boron nitride, 0.1 to 25 wt. % of an oxide of magnesium, 0.5 to 20 wt. % of at least one of rare earth oxides including yttrium oxide as an optional component and 25 wt. % or less of aluminum oxide as an optional component is disclosed.

Sintered ceramic composite and molten metal contact member produced

A magnet roll comprising a permanent-magnet member having a plurality of magnet poles extending axially on the outer circumferential surface thereof, and a hollow cylindrical sleeve, made of a non-magnetic material, both constructed in mutually rotatable fashion via a flange provided on both ends thereof; the surface of the sleeve being coated with a stainless-steel metal-spraying material containing more than 20% chromium.

Magnet roll

A heat roll for electrophotography of a surface heating type having a heating resistor is arranged such that a bonding layer, an insulating layer, a resistance layer, and a surface insulating layer are consecutively provided on an outer surface of a hollow cylindrical core, and a bearing member for fitting with a bearing is fitted at each opposite end of the heat roll. A pipe or a round bar formed of aluminum, an aluminum alloy, copper, a copper alloy, or the like which has a greater coefficient of thermal conductivity than that of mild steel is disposed inside the core to permit a uniform distribution of the temperature. In addition, a gap of 0.2 mm or more is provided between the inner surface of the core and an outer peripheral surface of the member formed of the high-temperature conductive material. As a result, effects that are attributable to a difference in the coefficients of thermal conductivity can be alleviated, and a temperature rise of the heat roll up to a predetermined temperature can be accelerated.

Heat roll for electrophotography

Growing community of inventors

Saitama, Japan

Yasuo Sawano