Other

Ykk Corporation

Yoshida Kogyo K.k.

Koji Hashimoto

Daiki Engineering Co., Ltd.

Hiroki Habazaki

Marek Danielewski

Stanislaw Mrowec

Katsuhiko Asami

Asahi Kawashima

Hideaki Yoshioka

Jinhan Kim

Akihito Hirota

Koji Hoshimoto

Kiyohiro Teruuchi

An amorphous alloy which is resistant to hot corrosion in sulfidizing and oxidizing atmospheres at high temperatures, consisting of at least one element selected from the group of Al and Cr and at least one element selected from the refractory metals Mo, W, Nb, and Ta, a portion of the set forth refractory metals being allowed to be substituted with at least one element selected from Fe, Co, Ni and Cu. The addition of Si further improves the alloy's oxidation resistance.

Amorphous alloys resistant to hot corrosion

An amorphous alloy which is resistant to hot corrosion in sulfidizing and oxidizing atmospheres at high temperatures, consisting of at least one element selected from the group of Al and Cr and at least one element selected from refractory metals of Mo. W, Nb and Ta, a portion of the set forth refractory metals being allowed to be substituted with at least one element selected from Ti, Zr, Fe, Co, Ni and Cu. The addition of Si further improves the alloy's oxidation resistance.

An amorphous alloy which is resistant to hot corrosion in sulfidizing and oxidizing atmospheres at high temperatures, consisting of at least one element selected from the group of Al and Cr and at least one element selected from refractory metals of Mo. W, Nb and Ta, a portion of the set forth refractory metals being allowed to be substituted with at least one element selected from Ti, Zr, Fe, Co, Ni and Cu. The addition of Si further improves the alloy oxidation resistance.

Amorphous alloys resistant against hot corrosion

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

An amorphous alloy which is resistant to hot corrosion in sulfidizing and oxidizing atmospheres at high temperatures, consisting of Cr and at least one element selected from refractory metals of Nb and Ta, a portion of the set forth refractory metals being allowed to be substituted with at least one element selected from Ti, Zr, Fe, Co, Ni and Cu. The addition of Si further improves the alloy's oxidation resistance.

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

Highly active amorphous alloy catalysts for use in decomposing of flons into hydrofluoric acid, hydrochloric acid and carbon dioxide by the reaction of flons with water, consist of at least one element selected from the group of Ni and Co, at least one element selected from the group of Nb, Ta, Ti and Zr, which are effective for the formation of the amorphous structure by coexisting with at least one element selected from the group of Ni and Co, and at least one element selected from the group of Ru, Rh, Pd, Ir and Pt, which are necessary for the high catalytic activity. The alloys are activated by immersion into hydrofluoric acids.

Growing community of inventors

Sendai, Japan

Hiroki Habazaki