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Schoonover is proud
to be a Representative of CM Furnaces since 1982. CM Furnaces
manufactures both
Laboratory and
Production Furnaces
for many industries and applications including ceramic, nuclear
fuel, sintering, powdered metal, strand
annealing and
others. To get a furnace quote, contact us at
info@schoonoverinc.com
or call us at 770-479-7138.
There are usually a number of ways to
build a high temperature furnace to meet a specific temperature
requirement. For a long lasting, efficient, minimum
maintenance high temperature furnace, here are some questions to
ask the furnace supplier:
| Ask
about . . . |
Why? |
| Type and quantity of insulation
of the high temperature furnace |
- The insulation package contributes to the efficiency of the furnace, its heating and
cooling response, and the maintainability of the furnace system.
- Cast insulation/heating element combinations are cheap to build but are not repairable.
|
| Type, size and number of heating elements |
- Don’t accept an element that will have to operate at its maximum temperature
capability to meet requirements.
- Overdriving means short element life.
- Using fewer and smaller elements saves initial cost, but raises the watt loading and
results in short element life and no reserve capacity.
|
| The overtemperature protection |
- A separate controller and thermocouple offers the best protection for high temperature
furnaces.
- Alarm functions on the primary controller could be negated by a shorted TC.
|
| Power requirements at the maximum operating
temperature |
- A good furnace will only use 40-50% of available power in normal operation at the
maximum operating temperature.
- This leaves some reserve for the inevitable oversized loads.
|
| The real maximum continuous operating
temperature |
- Select your furnace on the real temperature performance.
- Don’t over specify your maximum operating temperature, it costs money.
|
| The temperature uniformity |
- Don’t expect uniform temperature in the entire heated volume in any furnace.
- Be realistic in your specification. Small gradients over large volumes translate into
big dollars.
|
 Selection
Guide for CM Laboratory Furnaces
Series |
Operating
Temp. |
Atmosphere |
Muffle
Types |
Operating Mode |
Applications |
1200 |
to 1200° C |
Air
Inert (with retort)
Reducing
(with retort) |
Open Box
Metallic Retort |
Front Loading
Bottom Loading |
General Lab
Materials Testing
Process Verification |
1600 |
to 1600°
C |
Air
Inert (with gas seal option) |
Open Box
Tube
Option Gas Seal |
Front Loading
Bottom Loading
Horizontal or Vertical Tube |
High
Temperature
Materials Testing of Ceramics or Materials Processing |
1700 |
to 1700°
C |
Air
Inert (with gas seal option) |
Open Box
Tube
Option Gas Seal |
Front Loading
Bottom Loading
Horizontal or Vertical Tube |
High
Temperature
Materials Testing of Ceramics or
Materials Processing |
1800 |
to 1800°
C |
Air
Inert (with gas seal option) |
Open Box
Tube
Option Gas Seal |
Front Loading
Bottom Loading
Horizontal or Vertical Tube |
High
Temperature
Materials Testing of Ceramics or
Materials Processing |
2000 |
to 2000°
C |
Air |
Open Box |
Front Loading |
High
Temperature Ceramic Development |
1000 |
to 1200°
C |
Air
Inert or Reducing (with gas sealed muffle) |
Split Tube |
Horizontal or Vertical Tube |
Low
Temperature Testing or Materials Processing |
1300 |
to 1300° C |
Air |
Tube |
Horizontal or
Vertical Tube |
Diffusion Processes |
1400 |
to 1700° C |
Air |
Tube
with external taps on winding |
Horizontal or
Vertical Tube |
Precise Temperature Gradient
Control |
Selection Guide for CM Production Furnaces
|
Series |
Operating Temperature |
Atmosphere |
Muffle Type |
Operating Mode |
Applications |
|
300 |
To 1700oC |
Reducing or Inert |
Round and D-Shape Muffle |
Manual
External Stoker
Pusher |
Metallizing
Sintering
Annealing
Co-Firing |
|
400 |
To 2100oC |
Reducing or Inert |
Open Cavity |
Manual
External Stoker
Pusher |
Metallizing
Sintering
Annealing
Co-Firing |
|
500 |
To 1150oC |
Reducing or Inert |
Metallic Muffle |
Manual
External Stoker
Pusher
Humpback Belt |
Brazing
Bright Firing
Sintering
Heat Treating |
|
600 |
To 1150oC |
Reducing or Inert |
Metallic Muffle |
Manual
External Stoker
Pusher
Humpback Belt |
Brazing
Bright Firing
Sintering
Heat Treating |
|
700 |
To 1700oC
(Lower for Inert Atmosphere) |
Air or Inert |
Ceramic Muffle
Open Cavity |
Manual
External Stoker
Pusher |
Sintering
Annealing |
|
|
 Periodic
Production Furnaces include atmosphere control where
required.
|
Series |
Operating Temperature |
Atmosphere |
Muffle Type |
Operating Mode |
Applications |
|
2300 |
To 1300oC |
Air or Inert |
Box
Horizontal or Vertical Tube |
Bottom Loading |
Brazing
Heat Treating
Annealing |
|
2800 |
To 1550oC |
Air or Inert |
Box
Horizontal or Vertical Tube |
Front Loading
Bottom Loading |
Sintering
Heat Treating
Crystal Growth
Melting |
|
2900 |
To 1600oC |
Air or Inert |
Box
Horizontal or Vertical Tube |
Front Loading
Bottom Loading |
Sintering
Heat Treating
Crystal Growth
Melting |
|
3100 |
To 1700oC |
Air |
Box
Horizontal or Vertical Tube |
Front Loading
Bottom Loading |
Sintering
Heat Treating
Crystal Growth
Melting |
|
3200 |
To 1650oC |
Reducing or Inert |
Cylindrical Bell
Front Loading |
Power Lift |
Brazing
Bright Firing
Sintering
Crystal Growth
ASTM Testing |
|
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