| Introduction
- Carbolite has been in the forefront of furnace design for the past
60 years and their range of high temperature furnaces is the most comprehensive
available from a single source. There are over 50 standard models and
several specialist products with maximum operating temperatures between
144 and 2050°C.
The range sets new standards in performance, safety
and quality of construction. Included in the range are silicon carbide
heated furnaces to 1600°C and front and bottom loading models at
1700°C |
and 1800°C which
are heated by molybdenum disilicide (MoSi2) elements, manufactured
by Kanthal and known as Kanthal Super.
The ultra high temperature furnace is heated by Zirconthal
elements which provide a furnace temperature of up to 2050°C in
an oxidising atmosphere.
Versions are available with electrically operated
doors and a variety of controller and programmer options. |
| The extensive general purpose
range can be used for a wide variety of applications and in many different
sectors of industry, test laboratories and research, examples include:
firing of ceramics
calcining of ores
and powders
precious and exotic
metals heat treatment
sintering of ferrites
glass melting
crystal growth
high temperature reacting
studies
optical fibre tests
material properties
evaluations
Stylish and sturdy -
- modern compact styling which minimises bench space. The case is constructed
from zinc coated steel and finished in a hard wearing two-tone stoved
epoxy/polyester powder coating.
Convection cooling
- an air gap between the insulation and outer case promotes convected
air fow foor a cool outer case. All 1700 and 1800°C models are provided
with fan cooling.
Digital temperature control
- the control module houses a range of digital instrumentation for precise
temperature and process control. Push button setting with 1°C resolution.
Programmers permit automated firing cycles.
Chamber exhaust vent
- promotes the extraction of fumes generated by the process.
Postive break safety switch
- isolates power to the elements when the door is opened.
Solid state control
- 1400-1600°C models have zero voltage power switching and rapid
cycle time for smooth and reliable control. 1700°C and 1800°C
models have phase angle fired thyristor stacks.
|
Door
action - a vertical counterbalanced door mechanism keeps the
hot door insulation away from the operator when the door is opened;
this is particularly important at high temperatures. The bottom loading
models have the obvious advantage of raising the hearth into the heated
chamber.
Lightweight insulation
- provides faster heating and cooling times, increasing productivity
and energy efficiency. This is standard on most models.
Service - aided
by the simplicity of design; warning lights help diagnosis; easy access
to consumable parts is provided.
Options
viewing port (glazed or unglazed)
load thermocouple
port
calibration - access
can be provided to insert
a calibrated themocouple beside the control
thermocouple
temperature indicators
digital communications
overtemperature correction
(standard on 1700°C and 1800°C models)
calibration certificates
gas inlets
flowmeters
tables
process timers
Note: The EMF output of thermocouples operating above
1600°C reduces significantly during the first 500 hours, resulting
in the furnace temperature slowly rising. We therefore recommend regular
calibration checks on these thermocouples.
|
| Chemical
Attack!
Furnaces are mostly made from oxides of aluminium
(Al2O3 and SiO2). These oxides can
be chemically attacked by some materials. The most common ones are:
Low melting point oxides: Lead (Pb), Sodium (Na), Potassium (K); fluxes
used in melting such as as Lithium (Li) and Borax (B2O3);
and case hardening salts, eg Potassium Cyanide (KCN).
Sulphur and its compounds
Halogens - Chlorine (Cl), Flourine (F) and Iodine (I)
Water (H2O) vapour can cause problems where it condenses
and its presence accelerates chemical attack by the materials listed
above.
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