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DISCLAIMER: Any opinion expressed by a contributor is to be considered his/her own personal opinion, not the opinion of any other swiss-list member, the swiss-list website managers or the swiss-list committee.
Dear Friends,
I thought you may be interested in joining us at SHARE for a meeting with Jakob
Kuebler who is a member of the High Performance Ceramics lab at EMPA
(Swiss Federal Laboratories for Materials Testing and Research). The lab
collaborates with many university and industrial partners to optimize materials
as well as the processes to manufacture them in large scale.
Web site: http://www.empa.ch/abt123 <http://www.empa.ch/abt123>
The meeting will take place at SHARE next Tuesday January 20th at 3pm.
Jakob will give a short presentation of EMPA and its lab as well as talk about
MMCs (Metal Ceramics Composites) - see abstract below - and looks forward to
interacting with local researchers!
Please feel free to share this invitation with your colleagues. You simply need
to let us know in advance at pascal_at_shareboston.org if you plan to attend this
presentation.
-- ABSTRACT --
MMCs by activated melt infiltration: High-melting alloys and oxide ceramics
J. Kuebler
EMPA, Swiss Federal Laboratories for Materials Testing and Research, CH-8600
Duebendorf
For many engineering and construction applications as well as the manufacturing
of tools, materials with good wear and corrosion resistance are needed. In
spite of their good corrosion resistance the brittleness of ceramics inhibits
their use in monolithic form in many applications. MMCs combine ideally the
properties of ceramics with the ductility of metals.
Applications in pharmaceutical and food industries require materials which do
not contaminate tablets and edible goods. This aspect is fulfilled by Fe-base
alloys (Cr-Ni steels) as well as by most oxide ceramics.
The method of activate melt infiltration was developed at EMPA for the
production of MMCs using SiC ceramics in combination with low melting alloys
like bronze and Ag. As SiC is readily dissolved by Fe-base alloys, it cannot be
used for steel based MMCs. Oxide coatings on SiC provide insufficient
protection as they crack and blister well below the processing temperature of
>1200 0C. The ceramic AlN allows the fabrication of AlN/cast iron MMCs, but AlN
dissolves in aqueous environments thus no corrosion resistance is provided.
By selecting oxide ceramics as the ceramic component the requirement of
corrosion resistance is fulfilled. These are incorporated into the composite by
use of a preform of pressed particles or fabrication of a gradient structure
with partial ceramic reinforcement. Control of alloy type, volume content of
ceramic, content of activator and infiltration time allows the fabrication of
homogeneous MMC structures. Infiltration times from minutes to hours and even
days are possible due to good chemical stability of the oxides during long term
processing. This leads to good metal-ceramic bonding, which is of great
importance with --------respect to wear resistance. MMCs were fabricated with
infiltration depths from a few mm up to several cm.
Best regards,
-- THE SHARE TEAM
_______________________________________
Pascal Marmier
Advisor, Innovation and Entrepreneurship
SHARE, Consulate of Switzerland
420 Broadway
Cambridge, MA 02138
Phone: (617) 876-3076 ext.13
Mobile: (617) 331-3989
Email: pascal_at_shareboston.org <mailto:pascal_at_shareboston.org>
______________________________________
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Received on Fri Jan 16 2004 - 11:52:10 PST