Other

Yoshida Kogyo K.k.

Koji Hashimoto

Mitsui Engineering and Shipbuilding Company Limited

Daiki Engineering Co., Ltd.

Ykk Corporation

Mitsubishi Materials Corporation

Yanmar Diesel Engine Co., Ltd.

Asahi Kawashima

Katsuhiko Asami

Hideaki Yoshioka

Hiroki Habazaki

Naokazu Kumagai

Kimikado Miura

Akira Mitsuhashi

Yoshio Takizawa

Kazuo Shimamura

Akihito Hirota

Koji Hoshimoto

Kiyohiro Teruuchi

Jinhan Kim

Toshihisa Kanda

A corrosion-resistant amorphous alloy containing Ta in an amount of from 10 to 40 atomic % and Mo, Cr, W, P, B and/or Si is disclosed. This alloy can be prepared by rapidly cooling and solidifying molten alloy, shows a satisfactory corrosion resistance in high-temperature concentrated phosphoric acid, and is adapted to be used as a plant structural material or a separator for a fuel cell.

Amorphous nickel alloy having high corrosion resistance

Amorphous alloy comprising 30 to 75 atomic % Cr, the remainder being substantially at least one element selected from the group consisting of Ti and Zr and alloys represented by the general formula: X.sub.a Cr.sub.b M.sub.c wherein X is at least one element selected from the group consisting of Ti and Zr; M is at least one element selected from the group consisting of Mg, Al, Fe, Co, Ni, Cu, Mo and W; and a, b, and c are, in atomic percentage, a&gt;20, 20 .ltoreq.b.ltoreq.75, 0&lt;c .ltoreq.20 and a+b+c=100. The alloys are excellent in corrosion resistance and wear resistance, form a stable protective film and are spontaneously passive, even in corrosive environment such as a poorly oxidizing, highly corrosive HCl solution containing chlorine ions.

Highly corrosion-resistant amorphous alloys

Amorphous alloys having an extremely high corrosion resistance comprise Cr and at least one element selected from Ta and Nb, as essential components, and are spontaneously passive owing to the formation of stable protective films, even in very corrosive environments such as poorly oxidizing concentrated hydrochloric acid. The amorphous alloy may further include one or more elements appropriately selected from other alloying elements of Al, Ti, Zr, Fe, Co, Ni, Cu, Mo and W. The amorphous alloys have advantageous properties, such as very high corrosion resistance, high corrosion resistance at elevated temperatures and high wear resistance, and, therefore are useful in chemical plants or other industrial and domestic applications.

High corrosion resistant amorphous alloys

Amorphous alloy catalysts for conversion of exhaust gases to harmless

The present invention provides a method for the decomposition of chlorofluorocarbons to hydrofluoric acid, hydrochloric acid and carbon dioxide by the chlorofluorocarbons' reaction with water at a temperature of 200 .degree. C. or higher and in the presence of a catalyst material consisting of a metal selected from the group consisting of Ti, Zr, Nb and an alloy consisting of at least two elements selected from the same group. The catalyst material may also be composed of an alloy consisting of up to 80 atomic % of at least one element selected from the group consisting of Ni and Co and the substantial balance of being at least one element selected from the group consisting of Ti, Zr and Nb. The metallic catalyst materials of the present invention have a very high catalytic activity for the decomposition of flons at relatively low temperatures and can retain their high activity during the decomposition process, even if they are converted into fluorides.

Method for decomposition of chlorofluorocarbons

An amorphous aluminum-valve metal alloy with special characteristics such as high corrosion resistance, high wear resistance and considerable toughness, consisting of Al and at least one element selected from valve metals of Ti and Zr, a portion of the set forth refractory metals being allowed to be substituted with at least one element selected from Mo, W, Ta and Nb.

Sputter deposited amorphous titanium aluminum alloys

An amorphous aluminum-valve metal alloy with special characteristics such as high corrosion resistance, high wear resistance and coinsiderable toughness, consisting of Al and at least one element selected from valve metals of Ti and Zr, a portion of the set forth refractory metals being allowed to be substituted with at least one element selected from Mo, W, Ta and Nb.

Amorphous aluminum alloys

An amorphous aluminum-refractory metal alloy with special characteristics such as high corrosion resistance, high wear resistance and considerable toughness, consisting of Al and at least one element selected from refractory metals of Ta, Nb, Mo and W, a portion of the set forth refractory metals being allowed to be substituted with at least one element selected from Ti and Zr.

A method for preparation of amorphous superlattice alloys consisting of lamellae based on periodic change in the composition by continuous conventional sputtering with a periodic change in the positions of substrates relative to a target or targets by rotating the substrate on a first axis and orbiting the substrate and first axis around a second axis parallel to the first axis.

Preparation method for amorphous superlattice alloys

A highly corrosion-resistant amorphous alloy composed of ni-- 15-80 atomic % Ta Ni-- 30-80 atomic % Ta, or Ni-- 20-50 atomic % Ta-- 10-23 atomic % P, with a specific amount of optional elements of Ti, Zr, Nb, W, Fe, Co, Cr, P, B, Si, or C.

Method of preventing corrosion of a material against hydrochloric acid

Surface activated surface alloy electrodes and a process for preparing them high in corrosion resistance and activity, comprising a corrosion-resistant metal selected from, or a corrosion-resistant alloy composed of two or more metals selected from titanium, zirconium, niobium and tantalum, or a corrosion-resistant metal selected from, or a corrosion-resistant alloy composed of two or more metals selected from titanium, zirconium, niobium and tantalum clad with a corrosion-resistant metal selected from, or a corrosion-resistant alloy composed of two or more metals selected from titanium, zirconium, niobium and tantalum, or with any other metal or alloy, rolled or non-rolled, being used as a substrate metal or alloy; an alloy consisting of 20 to 67 atomic % of one or more metals selected from titanium, zirconium, niobium and tantalum, 0.01 to 10 atomic % of oine or more platinum group metals of ruthenium, rhodium, palladium, iridium and platinum, and substantially the remaining amount of nickel and/or cobalt, existing on said substrate metal or alloy as a rapidly solidified surface alloy of 150 .mu.m or less thickness containing amorphous phase at least partially; and said surface alloy, being treated to be activated on the surface.

Surface activated alloy electrodes and process for preparing them

A highly corrosion-resistant amorphous Cu alloys with at least one element selected from the group of Ta and Nb and other Cu-Ta alloys with at least one element selected from the group of Nb, Ti and Zr, wherein the total content of alloying elements other than Cu ranges from 15 to 85 at %.

Highly corrosion-resistant amorphous alloy

A highly active powder catalyst with a high concentration of platinum group elements prepared from an amorphous alloy consisting of at least one of valve metals, at least one of platinum group elements and balance being at least one element selected from Ni and Co by immersion in a hydrofluoric acid, and a highly active electrode prepared by using the above mentioned powder catalyst.

Highly active catalyst and highly active electrode made of this catalyst

A corrosion-resistant amorphous surface alloy is disclosed which is 150 .mu.m or less thick and bonded onto a substrate crystalline metal or alloy and processed by irradiation of high energy density beam, such alloy being composed of 8-19 at % Cr, 17-22 at % in the sum of P and 2-7 at % B, and the remainder being Ni, Ni--Co containing Co in an atomoic ratio of Co/Ni of 2/3 or less, or Ni--Fe or Ni--Co--Fe containing Fe in an atomic ratio of Fe/Ni or Fe/Ni+Co of 1/5 or less. Also disclosed is a process for producing such alloy.

Growing community of inventors

Sendai, Japan

Asahi Kawashima