Toyo Kogyo Co., Ltd.

Kenji Miyake

Tsuyoshi Morishita

Koji Yagii

Tuyoshi Morishita

Hiroshi Kumon

Noboru Ishii

Kiyokazu Inmaru

Kouji Tobita

Naoji Ueda

Yoshimaru Zitukane

Toshikazu Wakigara

Shigeru Akutagawa

A valve-seat material ideal for valve seats for vehicle-engine exhaust valves with no cobalt contained therein, superior in general use, has superior wear-resistance in high-temperature oxidizing atmosphere, and can be used independently of types of fuel to be used in the non-lead gasoline, lead-contained gasoline, L.P.G. or the like. The recession amount of the valve is extremely decreased and the wear resistance is remarkably improved.

Hard-particle dispersion type sintered-alloy for valve seat use

A piston for internal combustion engines has piston ring grooves at least one of which is totally or partly defined by an embedded body of a Fe based sintered material containing Ni and Cu. The sintered material is of a density of 5.5 to 6.8 g/cm.sup.3.

Aluminum based alloy pistons for internal combustion engines

A drilling bit for use in making a taphole in a blast furnace. The drilling bit has a bit head having a plurality of cutting tips radially arranged on and soldered to the bit head. Soldering of the tips to the bit head is carried out by the use of a soldering material of a particular composition containing 3 to 5% by weight of carbon, 0.5 to 3.0% by weight of silicon and the balance iron, the sum of the carbon content and the silicon content in the composition being at least 4% by weight relative to the total weight of the composition. Each of the tips which are to be soldered to the bit head by the use of the particular soldering material is made of either stellite or a super hard alloy.

Furnace taphole drilling bit

Sintering method which comprises two principal stages, which are a first stage wherein green compacts are sintered in a regular manner, and a second stage which immediately follows the first stage and wherein sintered compacts are held for a set time at a temperature which is elevated but is below sintering temperature and in carburizing gas, thereby diffusing required component into the compacts, for example carbon in the case of ferro-carbide compacts for use as sliding elements. Also according to the invention a sintering box may have formed therein holes of set size and distribution density thereby to permit efficient removal of lubricant if initially added to compacts.

Sintering method for making a high carbon ferrous sliding element

Growing community of inventors

Hiroshima, Japan

Kenji Miyake