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Magnetic Surface and Friction Tester

IP.com Disclosure Number: IPCOM000095018D
Original Publication Date: 1965-Aug-01
Included in the Prior Art Database: 2005-Mar-06
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Grady, A: AUTHOR [+3]

Abstract

Cobalt substituted gamma -Fe(2)O(3) is extremely unstable thermally. The instability is such that an increase in temperature causes a decrease in signal output from a previously recorded upon magnetic impulse record containing cobalt substituted gamma -Fe(2)O(3) in a suitable binder.

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Magnetic Surface and Friction Tester

Cobalt substituted gamma -Fe(2)O(3) is extremely unstable thermally. The instability is such that an increase in temperature causes a decrease in signal output from a previously recorded upon magnetic impulse record containing cobalt substituted gamma -Fe(2)O(3) in a suitable binder.

This characteristic of cobalt substituted gamma -Fe(2)O(3) is utilized to determine frictional contact between a record member containing cobalt substituted gamma -Fe(2)O(3) and the system through which it is passed, A comparative standard is developed by recording on the magnetic media at a fixed signal density and then subjecting the record media to various temperatures. By measuring the signal output after each incremental temperature level change, the relationship between temperature and signal output is determined. The thus standardized recording member is then passed through a recording system. By determining the output signal, the amount of heat causing frictional engagement between the record member and transducer can be determined as a function of the signal output.

Similarly, the surface roughness and frictional engagement between any material handling system and the material normally handled by the system is determined by utilizing cobalt substituted gamma -Fe(2)O(3) coated material for the normally handled material. The strategic placement of transducers gives the necessary readings to indicate the surface roughness and frictional enga...