Browse Prior Art Database

Making and Applying Keeper on Word Lines of Coupled or Flat Film Structures

IP.com Disclosure Number: IPCOM000091762D
Original Publication Date: 1968-May-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Grebe, KR: AUTHOR

Abstract

Ferrite keepers are sprayed on word lines of integrated coupled films or flat film structures. The ferrite materials are selected from a ferrite composition comprising Ni and Zn in calcined and a ferrite composition including Fe, Mn, Bi, Cu, Zn. A ferrite spray composition is prepared having 45.0 grams ferrite powder, 6.7 grams Weldwood contact cement, a butyl rubber composition prepared by U. S. Plywood Corp., and 10.0 grams of xylene are mixed for 5 minutes in a shaker mill.

This text was extracted from a PDF file.
This is the abbreviated version, containing approximately 69% of the total text.

Page 1 of 1

Making and Applying Keeper on Word Lines of Coupled or Flat Film Structures

Ferrite keepers are sprayed on word lines of integrated coupled films or flat film structures. The ferrite materials are selected from a ferrite composition comprising Ni and Zn in calcined and a ferrite composition including Fe, Mn, Bi, Cu, Zn. A ferrite spray composition is prepared having 45.0 grams ferrite powder, 6.7 grams Weldwood contact cement, a butyl rubber composition prepared by U. S. Plywood Corp., and 10.0 grams of xylene are mixed for 5 minutes in a shaker mill.

A creamy mix of proper viscosity is produced. The mix viscosity can be changed by increasing or decreasing the xylene content, without change in the keeper properties. The mix is sprayed from a Paasche VL5 Air Brush with 80 lbs of air pressure.

Prior to spraying, the substrate is masked with a stiff mask such as cardboard or .010" TEFLON* sheet. The mask does not have to be in intimate contact with substrate since any spray that squeezes below the mask edge can be brushed or wiped off.

Spraying is performed in even back and forth strokes, from top to bottom and back, then up and down from left to right and back to left, repeating this pattern until the desired thickness is achieved. Approximately 3 cc of mix can cover an area 2 3/4" x 2 3/4" - .010" thick. It is important that the spray strokes are overlapped and that each stroke does not stop or start at the edge of the pattern, but about one inch or better beyond...