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Chemically Deposited Cobalt Phosphorus Film Having Good Wear Characteristics

IP.com Disclosure Number: IPCOM000092524D
Original Publication Date: 1966-Dec-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Brock, GW: AUTHOR [+3]

Abstract

Generally, chemically deposited cobalt-phosphorus films have poor wear characteristics in that they are easily abraded. The wear characteristics of chemically deposited cobalt-phosphorus can be changed by modifying the grain structure of the deposit. Study of the grain orientation of the cobalt unit cell over a wide range of phosphorus content indicates that, as the c-axis lies more in the plane of the film, the wear resistance of the film is progressively increased.

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Chemically Deposited Cobalt Phosphorus Film Having Good Wear Characteristics

Generally, chemically deposited cobalt-phosphorus films have poor wear characteristics in that they are easily abraded. The wear characteristics of chemically deposited cobalt-phosphorus can be changed by modifying the grain structure of the deposit. Study of the grain orientation of the cobalt unit cell over a wide range of phosphorus content indicates that, as the c-axis lies more in the plane of the film, the wear resistance of the film is progressively increased.

The grain structure of the cobalt unit cell is a function of the phosphorus content of the film. Where phosphorus content is on the order of less than about 2% to about 2.3% by weight, the c-axis tends to be oriented normally to the plane of the film and exhibits poor wear characteristics. In the range of phosphorus content greater than about 2% to about 2.3%, by weight, the c-axis of the cobalt unit cell is oriented more in the plane of the film and exhibits relatively good wear characteristics.

Wear characteristics are tested by rubbing the surfaces of the film with a 1/4 inch diameter tungsten carbide ball under a 40 gram load. The number of passes of the ball required to wear through the film is counted. When chemically deposited cobalt films of equivalent thickness, but having variations in their phosphorus content, are tested in such a manner, films having progressively increasing phosphorus content exhibit progressive...