Browse Prior Art Database

Fixture for Binder Burnoff and Hot Pressing MLC Substrates

IP.com Disclosure Number: IPCOM000108114D
Original Publication Date: 1992-Apr-01
Included in the Prior Art Database: 2005-Mar-22
Document File: 1 page(s) / 48K

Publishing Venue

IBM

Related People

Chance, D: AUTHOR [+2]

Abstract

Use of a fixture made with materials disclosed herein will facilitate burnoff and hot pressing of MLC substrates requiring oxidizing, neutral, or reducing atmospheres during the firing process.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 78% of the total text.

Fixture for Binder Burnoff and Hot Pressing MLC Substrates

       Use of a fixture made with materials disclosed herein
will facilitate burnoff and hot pressing of MLC substrates requiring
oxidizing, neutral, or reducing atmospheres during the firing
process.

      Green MLC substrates contain polymer binders which must be
removed during the firing process.  This can be achieved through the
use of a steam atmosphere during the binder burnoff portion of the
firing cycle, as disclosed in (*). To insure good contact with the
ambient during binder burnoff, porous ceramic materials, such as
partially sintered alumina, magnesia, or zirconia, can be used to
support and contain parts during that portion of the firing cycle.
Fixtures constructed solely of porous materials such as those
mentioned would not be suitable for hot pressing applications due to
their low strength.  However, fixtures constructed of a porous
ceramic material surrounded by a frame made from a dense ceramic
material would be useful for hot pressing applications.  The required
properties of the dense ceramic material are high tensile strength,
oxidation resistance, and thermal shock resistance, as well as an
accommodating thermal expansion coefficient.  Materials which satisfy
those requirements include silicon nitride, aluminum nitride, boron
nitride, and silicon carbide.

      A possible fixture design is shown in cross section in the
figure.  It consists of the frame made of dense ceramic...