Rotary compressor having oxidizing and nitriding surface treatme

Details Rotary compressor having oxidizing and nitriding surface treatme Rotary compressor having oxidizing and nitriding surface treatme

1989-04-19

1990-07-31

Koczo, Michael

Rotary expansible chamber devices

With wear surface treatment or integrally plated wear layer

418179, 4284722, 428701, F04C 18356

Patent

active

049446630

ABSTRACT:
A sliding member of an iron-based non-porous material, such as vane, of a rotary compressor has a sliding surface processed by a surface treatment in which the surface is subjected to oxidizing and nitriding to form an oxidized and nitrided layer thereon. The surface is then subjected to a steam-treatment in which water is caused to react with components of the oxidized and nitrided layer to form a layer of oxidized iron of a porous network structure disposed outwardly of the oxidized and nitrided layer. The oxidized iron layer is composed mainly of tri-iron tetroxide and softer than the oxidized and nitrided layer.

REFERENCES:
patent: 3748195 (1973-07-01), Kondo et al.

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