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Macor is
a relatively easy material to machine using ordinary
carbide drills, end mills, taps, etc. and doesn’t
require post machining firing. Macor-Machinable Glass
Ceramic is also unique in that it can withstand 1000°C, has low thermal conductivity and is a good
electrical insulator. Macor is often the material of
choice because it is easy to machine into complex
shapes, doesn’t require sintering and is, readily
available even in small quantities.
Whatever your requirement; Macor® stock or machined
parts,
“Contact
us” Today
MACOR® Material
Properties Data
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| MACOR® |
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| Machinable
Glass Ceramic |
 is
MACHINABLE with no
ordinary metal working
tools |
|
allows FAST
TURNAROUND, no post
firing required |
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holds TIGHT
TOLERANCES, up to
.00005" |
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withstands HIGH
TEMPERATURE, up to
1000°C (no load) |
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is CLEAN, no
outgassing and
zero porosity |
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Properties |
| MACOR®
Machinable Glass Ceramic has a
continuous use temperature of
800°C and a peak temperature of
1000°C. Its coefficient of
thermal expansion readily
matches most metals and sealing
glasses. It is non-wetting,
exhibits zero porosity, and
unlike ductile materials, won't
deform. It is an excellent
insulator at high voltages,
various frequencies, and high
temperatures. When properly
baked out, it won't outgas in
vacuum environments. |
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Machining |
| Machining
tolerances are surprisingly
tight, up to .0005". It can be
machined to a surface finish of
less than 20µin.-AA.
Configurations are limited only
by available equipment and the
experience of the machinist. |
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| Sealing,
Joining and Metalizing |
|
MACOR® MGC can also be joined
or sealed - both to itself and
to other materials - in a number
of ways: metalized parts can be
soldered together and brazing
has proven an effective method
of joining the material to
various metals; epoxy produces a
strong joint, and a sealing
glass creates a vacuum tight
seal. Even a straight-forward
mechanical joint is possible.
It can be thick film
metalized using metal links, or
thin film metalized by
sputtering.
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Applications
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Ultra-High Vacuum Environments |
| MACOR®
Machinable Glass Ceramic is used
as an insulator or coil support
and for vacuum feed-throughs. In
these applications, the
conductive materials are
supported by the
MACOR® MGC part
and a compatible sealing glass
is used to produce a
vacuum-tight, hermetic seal. |
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| Constant
Vacuum Applications |
| MACOR MGC parts
are found in spacers, heaters
and windows for microwave tube
devices and as sample holders in
field ion microscopes. |
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Aerospace Industry |
|
Over 200 distinctly shaped
MACOR® MGC parts can be found on
America's reusable Space
Shuttle, Orbiter. Retaining
rings of MACOR MGC are used at
all hinge points, windows and
doors.
Also, large pieces of
MACOR®
glass ceramic are used in a NASA
spaceborne gamma radiation
detector. For this application,
frame corners are joined by a
combination of machined
(butt-lap) mechanical joints and
a sealing glass.
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Nuclear-Related Experiments |
| Since MACOR MGC
is not dimensionally affected by
irradiation, small cubes of the
material are machined to a
tolerance of one micron and used
as a reference piece to measure
dimensional change in other
materials. |
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| Welding
Nozzles |
| Welding
equipment manufacturers are
using
MACOR® MGC as a nozzle on
the tips of oxyacetylene
torches. The material's
non-wetting characteristic means
molten particles won't adhere to
and decrease the effectiveness
of the nozzle. |
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| Fixtures |
| MACOR MGC is
used as an electrode support and
burner block in several
industrial high heat, electrical
cutting operations due to its
low thermal conductivity and
excellent electrical properties. |
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| Medical
Equipment |
| Producers of
medical components are intrigued
by
MACOR® MGC's inertness,
precise machinability and
dimensional stability. |
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| With
MACOR® Machinable Glass Ceramic
(MGC), fabrication is fast
because it can be machined into
complicated parts with ordinary
metal working tools, quickly and
inexpensively, and it requires
no post firing after machining.
That means no frustrating
delays, no expensive hardware,
no post fabrication shrinkage,
and no costly diamond tools to
meet specifications. |
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| The Point is this: |
| When you need the
performance of a technical
ceramic (high use temperature,
electrical resistivity, zero
porosity) and your application
demands the ready fabrication of
a complicated shape (quickly,
precisely, privately), look at
MACOR® MGC. It will lower costs
and substantially reduce the
time between design and actual
use. |
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Properties
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Technical Data
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| The general
characteristics of this material described below
were derived from laboratory tests performed by
Corning from time to time on sample quantities.
Actual characteristics of production lots may
vary. |
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MACOR® Machinable Glass-Ceramic
is a product of Corning Glass Works. San Jose
Delta, authorized Stocking
Distributor-Fabricator, converts the basic
material into a wide range of standard sizes
which allow the user to conveniently machine the
final part. San Jose Delta can also
custom-fabricate
MACOR® Machinable Glass-Ceramic
to the customer's drawing.
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| Round Rod Sizes |
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TOLERANCE ON ROD LENGTH:
Minus 1/16" (1.59mm) plus an unspecified
amount |
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FRACTIONAL DIAMETER
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6"DECIMAL DIAMETER &
TOLERANCE
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METRIC DIAMETER & TOLERANCE
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1/8"
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3/16"
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.188"
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4.76
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1/4"
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.250"
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6.35
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3/8"
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1/2"
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.500"
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12.7
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5/8"
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.625"
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15.88
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3/4"
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.750"
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19.05
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1"
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1.000"
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25.4
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1-1/4"
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1.250"
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31.75
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1-1/2"
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2"
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2.000"
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50.8
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3"
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3.000"
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76.2
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4"
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4.000"
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101.6
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6"
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6.000"
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152.4
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Sheet Sizes
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FRACTIONAL THICKNESS
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DECIMAL THICKNESS &
TOLERANCE
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METRIC THICKNESS & TOLERANCE
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1/8"
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1/4"
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1/2"
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3/4"
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.750"
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19.05
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1"
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.1.000"
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25.4
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1-1/4"
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.1.250"
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31.75
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2"
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.2.000"
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50.8
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Other Information
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| Cost-Savings |
For greatest economy, the user
should compare prices of all listed
sizes and shapes that would yield the
desired finished items. Due to the way
MACOR® Machinable Glass-Ceramic is named
an equivalent amount of material in the
form of smaller pieces sometimes costs
less than a single larger piece. Also,
in some cases, thicker or larger
diameter pieces cost less than similar
thinner or smaller diameter pieces. |
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|
Non Standard Items
"Machining Stock" |
Please ask for special quotations
which do not appear on tis price list.
Various shapes including rectangles,
cylinders and discs in sizes that are
between larger or smaller than listed
sizes may be furnished. Special items
often cost less than the nearest
standard sizes. |
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| Custom Fabrication |
Pricing for precision blanks or
fully fabricated parts made to customer
drawing will be furnished on request. |
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MACOR®
Machining Instructions
Key factors for successful machining
are proper machining speeds and coolant.
MACOR® Machinable Glass Ceramic can be
machined with high speed steel tools,
but carbide tools are recommended for
longer wear.
Achieve the best results by using a
water soluble coolant, such as Cimstar
40 - Pink, especially formulated for
cutting and grinding glass or ceramics.
No post firing is required after
machining.
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| Grinding |
| Diamond, silicon-carbide or
aluminum-oxide grinding wheels can be
used. |
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| Polishing |
| Start with loose 400-grit silicon
carbide on a steel wheel. For the final
polish, use cerium oxide or alumina on a
polishing pad for glass or ceramics. A
0.5µin.-AA finish can be achieved. |
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| Sawing |
| Use a carbide grit blade at a band
speed of 100 fpm. An alternative is a
silicon carbide or diamond cut-off
wheel. |
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| Turning |
| Cutting speed |
30-50 sfm |
| Feed rate |
.002-.005 ipr |
| Depth of cut |
.150-.250 in. |
|
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| Milling |
| Cutting speed |
20-35 sfm |
| Chip Load |
.002 ipt |
| Depth of cut |
.150-.250 in. |
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| Drilling |
| Drill size |
Spindle Speed |
Feed Rate |
| 1/4 in. |
300 rpm |
.005 ipr |
| 1/2 |
250 |
.007 |
| 3/4 |
200 |
.010 |
| 1 |
100 |
.012 |
| 2 |
50 |
.015 |
|
| Allow at least .050" of extra
material on the back side for breakout.
This excess can be removed after
drilling. |
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| Tapping |
| Make clearance holes one size larger
than those recommended for metals.
Chamfer both ends of the hole to reduce
chipping. Run the tap in one direction
only. (Turning the tap back and forth
can cause chipping.) Continuously flush
with water or coolant to clear chips and
dust from the tap. |
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| Composition |
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MACOR® Machinable Glass Ceramic is a
white, odorless, porcelain-like (in
appearance) material composed of
approximately 55% fluorophlogopite mica
and 45% borosilicate glass. It has no
known toxic effects; however, the dust
created in machining can be an irritant.
This irritation can be avoided by good
housekeeping and appropriate machining
techniques. The material contains the
following compounds:
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Approximate Weight % |
| Silicon - SiO2 |
46% |
| Magnesium- MgO |
17% |
| Aluminum - SiO2 |
16% |
| Potassium - K2O |
10% |
| Boron - B2O3 |
7% |
| Flourine - F |
4% |
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Microstructure of
MACOR® MGC 5000X
magnification
Randomly oriented mica flakes in the
microstructure of
MACOR® MGC are the key
to its machinability.
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