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A NEW SUBSTRATE PROCESS CONTROL FOR SLIDER FAB STRESS CONSISTENCY

IP.com Disclosure Number: IPCOM000013226D
Original Publication Date: 2000-Apr-01
Included in the Prior Art Database: 2003-Jun-18
Document File: 1 page(s) / 27K

Publishing Venue

IBM

Abstract

Described is a new integrated material synthesis methodology for a special class of ceramic/ceramic composites. Composites made by this approach will exhibit more precision on tolerance control from machining stress.

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  A NEW SUBSTRATE PROCESS CONTROL FOR SLIDER FAB STRESS CONSISTENCY

   Described is a new integrated material synthesis methodology for a special
class of ceramic/ceramic composites. Composites made by this approach will
exhibit more precision on tolerance control from machining stress.

There are two phases in this integrated method: (1) synthesis and (2) further
selection of material with the right microstructure for targeted machining
distortion. In phase one, there are several requirements for selection of the
raw ceramic constituents which make up the composite materials. The raw material
for the two major constituent phases should be in powder blend form. They should
be mutually chemically stable up to the sintering temperature. The two major
phases at any time must not be allowed to form a complete solid solution; one
constituent phase should be electrically conductive and be a minority phase near
its percolation limit, usually between 18 to 28v%, with respect to the insulating
phase (IP). The percolation requirement is to ensure, if kinetically favorable,
a formation of interpenetrating microstructure. To provide driving force for
conductive phase (CP) interconnection during consolidation, it is commonly
determined that, kinetically, the in-situ inter-phase energy should be less than
60% of grain boundary energy of IP. The prescribed electrical property
relationship among phases should not be modified by the consolidation process of
the powder set.

Powder consolidation is achieved through solid state sintering, a process relying
on solid state mass transfer to consolidate powder into near pore-free solids.

As a necessary condition, powder should be mechanically mixed/milled to achieve
homogeneous dispersion prior s...