Browse Prior Art Database

Magnetic Head Coating Process

IP.com Disclosure Number: IPCOM000083428D
Original Publication Date: 1975-May-01
Included in the Prior Art Database: 2005-Mar-01
Document File: 2 page(s) / 43K

Publishing Venue

IBM

Related People

McClocklin, RS: AUTHOR [+3]

Abstract

Preprofiled magnetic heads for reading and writing data on magnetic media may be plasma flame sprayed to provide a coating with low porosity, high-bond strength and minimized oxide reduction. The plasma flame spraying device is illustrated in Fig. 1 as a front elevation without the spray gun and in Fig. 2 as a plan view with the cooling accessories removed.

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Magnetic Head Coating Process

Preprofiled magnetic heads for reading and writing data on magnetic media may be plasma flame sprayed to provide a coating with low porosity, high-bond strength and minimized oxide reduction. The plasma flame spraying device is illustrated in Fig. 1 as a front elevation without the spray gun and in Fig. 2 as a plan view with the cooling accessories removed.

The magnetic heads 5 to be coated are mounted on a rotary aluminum fixture 6 with the surface to be coated facing radially outward. The magnetic media read-write head 5 is a complex assembly having a temperature degradation point of about 175 degrees F. To retain the assemblies in process below this temperature while attaining an economical production rate, complex cooling techniques are utilized in addition to the specific spray parameters.

A series of eight side and face CO(2) cooling jets 7 (one of each of 4 pairs being visible) project from a manifold 8 supplied with 35 PSI CO(2) through a conduit 9. A vortex nozzle 10 and two high-volume air jets 11 direct 90 PSI air toward the aluminum fixture 6. Also, as seen in Fig. 2, there are a pair of gun air jets 12 mounted on the plasma spray nozzle 13 which, like the spray nozzle, are directed toward the head assemblies 5 mounted on fixture 6.

The spray parameters for the ceramic material (60% aluminum oxide and 40% titanium oxide) were optimized to produce the highest particle velocity and most efficient powder melting (maximized p...