Riken Corporation

Showa Denko Kabushiki Kaisha

Kabushiki Kaisha Riken

Fumio Kiyota

Masaharu Hasei

Yukio Nakanouchi

Shin'ichi Horie

Tadao Hirano

Kazutoshi Takemura

Tatsuo Fujita

Takashi Oda

A method and a detector for detecting nitrogen oxide in test gas are provided wherein test gas which contains NOx and interference gases is supplied through an oxygen feeder 4 into a measuring chamber 1a, and the interference gases are oxidized by oxygen or oxygen ion supplied to the measuring chamber 1a through oxygen feeder 4. A total amount of NOx in the test gas is detected based on a level of EMF produced between a first electrode 2 for detecting oxygen and NO2 gas and a second electrode 3 for detecting oxygen.

Nitrogen oxide detector

The present invention relates to an aluminum alloy powder. Aluminum alloy powder having a high Si content is known but its heat resistance, wear resistance, and strength are poor. The aluminum alloy powder according to the present invention is characterized in that it contains from approximately 10.0% to approximately 30.0% of silicon and at least one element selected from the group consisting of from approximately 5.0% to approximately 15.0% of nickel, from approximately 3.0% to approximately 15.0% of iron, and from approximately 5.0% to approximately 15.0% of manganese, the silicon crystals in the aluminum alloy powder being 15 .mu.m or less in size. Due to the high content of nickel, iron, and manganese, the matrix is hardened and strengthed by the presence of finely dispersed intermetallic compounds and the silicon crystals, and thereby the high-temperature characteristics are improved. The shaped body, e.g., a hot-extruded shaped body, according to the present invention comprises an aluminum alloy having the above composition powder of the present invention and preferably a solid lubricant, the silicon crystals in the shaped body being 15 .mu.m or less in size, and the intermetallic compounds 20 .mu.m or less in size being finely distributed in the shaped body. The high-temperature characteristics of the shaped body are very excellent, thereby enabling it to be used as a cylinder liner which is inserted into an aluminum cylinder block body by casting the body.

Heat-resistant, wear-resistant, and high-strength aluminum alloy powder

A novel group of iron-base sintered alloys especially suitable for valve seat manufacture having excellent wear resistance and good machinability is provided. The alloy is produced by a combination of specific atomized pre-alloyed powder, iron powder and graphite powder by compacting and sintering processes. Various manufacturing methods with or without infiltration of filler materials into pores in the sintered product to improve wear resistance and machinability are disclosed.

Iron-base sintered alloy for valve seat and its manufacture

Growing community of inventors

Kashiwazaki, Japan

Fumio Kiyota