Toa Nenryo Kogyo Kabushiki Kaisha

Tonen Corporation

Hiroshi Kaya

Takeshi Isoda

Tadashi Suzuki

Shohei Okano

Ikuo Akizuki

Kozaburo Tamura

Hiroyuki Aoki

Osamu Funayama

Takuji Itoh

Mikiro Arai

Tomoko Aoki

Tadashi Miura

Hayato Nishii

Tomohiro Kato

Toshio Katahata

Genshiro Nishimura

Kiyoshi Sato

Hirohiko Nakahara

Ichiro Kohshi

Masaaki Ichiyama

Mutsuo Haino

Keiji Kumagai

Atsuro Takazawa

Atushi Tezuka

Hiroki Morozumi

Tamio Ishiyama

Yoshihito Kaneko

Nobuo Otake

Kouichi Yasuda

Method for producing ceramic products

Inorganic fibers having a high strength and a high modulus of elasticity at a high temperature are provided. The inorganic fibers are amorphous inorganic silicon nitirde-based fibers composed of silicon and nitrogen, optionally with oxygen, carbon and hydrogen, and having atomic ratio between above respective elements of N/Si=0.3 to 3, O/Si=up to 15, C/Si=up to 7 and H/Si=up to 15, wherein ratios of X-ray scattering intensity thereof to that of air at 1.degree. and 0.5.degree. are from 1 to 20 respectively and the silicon nitride-based fiber is still amorphous after heating in an inactive atmosphere at 1200.degree. C. for 1 hour. Composites of a metal, a ceramics, and a high molecular weight organic compound reinforced with the above fibers are also provided.

Silicon nitride-based fibers and composite material reinforced with

A molded body formed of a silicon nitride-based ceramic containing Si and N and optionally O, C and/or a metal. The ceramic is formed from a polysilazane. A molded body may be a composite body which is composed of a matrix of the ceramic and a reinforcing material such as powder or fiber embedded within the matrix or which is composed of ceramic powder bound with a binder formed of the silicon nitride-based ceramic.

Molded articles formed of silicon nitride based ceramic and process for

Disclosed is a catalyst suitable for hydrotreating hydrocarbonaceous oils which catalyst is comprised of at least one hydrogenative-active metal component supported on a carrier material comprised of about 20 to 60 weight percent of amorphous silica-alumina and about 80 to 40 weight percent of crystalline alumina having an average crystallite size of 35 .ANG., or less.

Hydrotreating catalysts

Hydrotreating catalyst comprising silica/alumina or silica/alumina-containing carrier comprising 2 to 35 wt. % silica and Group VIII and/or Group VIB metals as hydrogenation active components is prepared by first step impregnation with at least one Group VIII metal and a second step impregnation with at least one Group VIB metal. Preferably the impregnation is via ion exchange using a complex salt, preferably an ammine or amine salt, of the metal. The carrier is characterized by a maximum of pores in 30 to 100 .ANG. range and a minimum of pores in 0 to 30 .ANG. and in 300 .ANG.+.

Hydrotreating catalyst and process of manufacture

Fired nitride-base ceramics, i.e., silicon nitride or oxynitride, having a low carbon content and, therefore, low electrical and thermal conductivities, can be produced by heat treating a ceramic precursor comprising polysilazane, polysiloxazane or polycarbosilazane or a mixture thereof as the main ingredient in a reducing atmosphere such as hydrogen, ammonia or a gas containing these components, followed by firing.

Method for producing nitride-base ceramics

Growing community of inventors

Saitama, Japan

Hiroshi Kaya