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Ceramics
Ceramics form the basis of most of MPD Components products. Ceramic
parts perform structural and/or electronic functions in what we make.
These ceramics fall into two general categories:
- forsterite
ceramics, including types that match the temperature coefficient
of titanium, and
- alumina
ceramics that mate with nickel, stainless steel or other alloys
and to maintain a hermetic seal across a broad temperature range
MPD FORSTERITE and ALUMINA Technical Data
Click on this hyperlink to see a technical
data table of Ceramic Properties. Click on this hyperlink to see
a Thermal
Expansions Chart of metals and ceramics.
NOTE:
The above documents are in Adobe's Acrobat portable document format
(*.pdf). To view or print these documents you will need version
4.0 of Adobe's Acrobat Reader or higher.
MPD FORSTERITE CERAMICS
MPD forsterite ceramics are dense, fine grained, vacuum-tight materials
originally developed for use in hermetically-sealed devices such as
VED's (electron tubes), rectifiers, and vacuum switches. Their unique
combination of properties , however, has led to broadly-increased
usage.
MPD forsterites combine high mechanical strength, low dielectric constant,
and resistance to corrosion, with a unique expansion characteristic
ideally suited to ceramic-to-metal sealing techniques. For example,
the thermal expansion characteristic of one of the patented forsterite
composition matches that of titanium metal over a broad range of temperatures,
permitting the manufacture of many devices for critical high tech
applications (See Thermal
Expansions Chart).
MPD ALUMINA CERAMICS
MPD alumina ceramics meet the life, reliability and severe-environment
factors imposed in high tech and space bound applications in virtually
every respect: exceptional hardness, flexural strength, and electrical
properties combined with an excellent resistance to highly corrosive
agents. Available in a wide range of grades from "general purpose"
to virtually pure sintered forms approaching theoretical density.
MPD alumina characteristics are matched in the required combinations
to the needs of each application.
The "general purpose" materials range in composition from
94% to 97%, and have a precise balance of additive oxides to control
such critical properties as flexural strength, density, dielectric
power factor and metallizeability. Other grades are tailored to have
extremely fine grain size and low pore volume where surface finish
is important.
Still other compositions exceeding 99% alumina are designed to have
ultra-low dielectric loss for critical electronic applications, or
inertness to the severely corrosive alkali metals. All of these materials
can be joined to metals and non-metals through appropriate sealing
techniques employed in-house.
MPD manufactures aluminas which are metallized and plated to your
specifications - a factor of considerable importance to applications
demanding one of the high-purity aluminas which require special metallizing
treatments.
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