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Re-crystallized Alumina & Mullite
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Duralox 997 Re-crystallised Alumina Ceramic
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Duralox 997 Re-crystallised Alumina Ceramic
is fine grained, non porous, dense and impervious, and is of exceptionally high purity containing 99.7% Al2O3
and less than 0.05% SiO2 in its residue.
| 1) |
Stability at high temperature and Chemical
Inertness
Duralox 997 is inert even at high temperatures in reducing atmosphere and flux attack due to low silica
content in its residue. |
| 2) |
Physical Strength
Duralox 997 alumina is extremely hard with high mechanical strength and resistance to abrasion and corrosion,
good thermal conductor at high temperatures. |
| 3) |
Imperviousness
Duralox 997 alumina products are fired at extremely high temperature around 1800°C which ensures impermeability
under severe and critical conditions. |
| 4) |
Product Range
Duralox 997 Recrystallised 99.7% alumina range includes pyrometry tubes with one end closed, both ends open,
tubes with single and multibores, capillary tubes, thinwalled crucibles, dishes, plates, discs and boats
for laboratory use, ballastic armor tiles, Pallets, profiles and custom designed parts. |
| 5) |
Good Electrical Resistivity
Duralox 997 alumina maintains good electrical resistivity at high temperatures. |
| 6) |
High heat Conductivity
Duralox 997 alumina products are considered as high-tech products and are manufactured with advanced technology,
therefore maximum density is ensured with minimum wall thickness. This makes the highest possible heat transfer. |
| 7) |
Amphoteric
Duralox 997 alumina is highly resistant to acid slugs. |
Pyrometry Sheaths
The main feature of Duralox 997 recystallised alumina is its very high degree of chemical inertness.
It offers a high degree of protection against reactive slags or furnace gasses and its low silica content ensures
that there is no contamination of rare metals such as platinum by silicon - a frequent cause of loss of calibration
in thermocouples.
Tubes
Duralox 997 Recrystallised Alumina tubes have good electrical resistivity as well as high thermal
conductivity at high temperatures. When adequately supported they can be used up to a temp. of 1800°C+ (3272°F+)
and are suitable for molybdenum and tungsten wound tube furnaces, particularly for processes requiring a tube
of an impervious nature.
Single and Multibore Insulators
Duralox 997 Recrystallised Alumina can be used up to a temperature of 1800°C and above. It is
particularly suitable for use as an insulator for rare metal thermocouples, because its low silica content ensures
that there is no contamination of rare metals such as platinum with silicon.
Duralox 997 alumina one end closed thermocouple protection
tubes are fired vertically at around 1800°C temp. in oxygen atmosphere in micro processor controlled state-of-the-art
kiln. After sintering, 100% thermocouple sheaths are tested under air pressure to ensure gas tightness.
Advantages
Duralox 997 Recrystallised Alumina Ceramic offers
following advantages over the metals :
| 1) |
Continuous high temperature resistance > 1800°C. |
| 2) |
Higher thermal stability. |
| 3) |
Lower thermal expansion. |
| 4) |
Higher electrical insulation. |
| 5) |
Higher modules of elasticity, hence higher rigidity. |
| 6) |
Greater hardness and wear resistance. |
| 7) |
Higher abrasion corrosion and oxidation resistance |
| 8) |
Higher compressive strength. |
| 9) |
Inert to Hydrogen, Carbon and refractory metals under most severe conditions, non toxic,
non radioactive, non magnetic and non-aging. |
With above physical properties, Duralox 997 ceramic
is found far superior to Mullites and is most suitable for use for noble metal thermocouples, furnace tubes,
high temperature vacuum furnaces etc.
Duralox 997 (Din Vde 0335) Re-Crystallised Alumina Ceramic Protection Sheaths For Thermocouples & Sensors
Closed one end (COE)
|
(All dimension in millimeters) |
| Pat. Ref. |
 |
Outer Dia (OD) |
|
Inner Dia (ID) |
|
Length Upto (L) |
| RC PS 6-4 |
|
* 6 |
|
4 |
|
---- |
|
| RC PS 7-5 |
|
* 7 |
|
5 |
|
---- |
|
| RC PS 8-5 |
|
* 8 |
|
5 |
|
1030 |
|
| RC PS 10-6 |
|
**10 |
|
6 |
|
1030 |
|
| RC PS 12-8 |
|
**12 |
|
8 |
|
1500 |
|
| RC PS 15-10 |
|
**15 |
|
10 |
|
1500 |
|
| RC PS 20-15 |
|
**20 |
|
15 |
|
1500 |
|
| RC PS 24-18 |
|
**24 |
|
18 |
|
1500 |
|
| RC PS 28-22 |
|
**28 |
|
22 |
|
1500 |
|
| RC PS 30-23 |
|
**30 |
|
23 |
|
1500 |
* Pyrometer protection sheaths (closed one end) are available from 100 to 1030mm
long.
** 100 to 1500mm long.
Only against specific enquiry, we can offer protection thermocouple sheaths
and tubes open both ends with flange, price on request.
Please do not fail to specify length of the sheath in your purchase enquiry.
Pyrometer Sheath sizes not shown in above table can be made on request, if found
feasible.
Workable dimensional tolerances are adhered to DIN standards 40680 medium class.
Closer tolerances on enquiry.
- Code RC PS correspond to Re-crystallised Pyrometry Protection Sheath.
- Sheath means closed one end Pyrometer tube.
Duralox stands for Durable Aluminium Oxide and is a registered trade
name of Jyoti Ceramic Industries Pvt. Ltd. For Aluminim Oxide ceramic compositions containing 90 to 99.7% &
above percentage Al2O3 in its residue.
Duralox 997 recrystallised (din
vde 0335) alumina ceramic, solid round rods, single & multibore tubes.
 |
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 |
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| Solid Round Rod |
Single Bore Tube |
2 Bore Tube |
4 Bore Tube |
Oval 2 Bore Tube |
| Ref. Code |
Ref. Code OD/1B |
Ref. Code OD/2B |
Ref. Code OD/4B |
Ref. Code LXW/2B |
| RC SR-2.0 |
RC SB-1.6 x 1.0 |
RC 2B-2.0 x 0.6 |
RC 4B-2.5 x 0.6 |
RC O-2B-2.3/1.4 x 0.7 |
| RC SR-3.0 |
RC SB-1.8 x 1.2 |
RC 2B-2.5 x 0.6 |
RC 4B-3.0 x 0.8 |
RC O-2B-3.0/1.5 x 0.8 |
| RC SR-4.0 |
RC SB-2.0 x 1.0 |
RC 2B-3.0 x 0.7 |
RC 4B-3.5 x 1.0 |
RC O-2B-4.2 x 2.2 x 1.2 |
| RC SR-5.0 |
RC SB-2.7 x 1.7 |
RC 2B-3.0 x 1.0 |
RC 4B-4.0 x 1.0 |
|
| RC SR-6.0 |
RC SB-3.0 x 2.0 |
RC 2B-4.0 x 0.8 |
RC 4B-4.5 x 1.0 |
|
| RC SR-8.0 |
RC SB-4.0 x 2.0 |
RC 2B-4.0 x 1.0 |
RC 4B-4.5 x 1.3 |
|
| RC SR-10.0 |
RC SB-5.0 x 3.0 |
RC 2B-4.5 x 1.0 |
RC 4B-5.0 x 1.0 |
|
| RC SR-12.0 |
RC SB-6.0 x 3.0 |
RC 2B-4.5 x 1.5 |
RC 4B-5.0 x 1.3 |
|
| RC SR-12.5 |
RC SB-6.0 x 4.0 |
RC 2B-5.0 x 1.5 |
RC 4B-6.0 x 1.3 |
|
| RC SR-15.0 |
RC SB-8.0 x 5.0 |
RC 2B-5.0 x 1.8 |
RC 4B-6.0 x 1.5 |
|
| RC SR-18.0 |
RC SB-10.0 x 6.0 |
RC 2B-5.5 x 2.0 |
RC 4B-7.0 x 1.5 |
|
| RC SR-20.0 |
RC SB-12.0 x 8.0 |
RC 2B-6.0 x 1.8 |
RC 4B-8.0 x 2.3 |
|
| RC SR-22.0 |
RC SB-15.0 x 10.0 |
RC 2B-6.0 x 2.0 |
RC 4B-8.5 x 1.5 |
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| RC SR-25.0 |
RC SB-20.0 x 15.0 |
RC 2B-6.5 x 1.8 |
RC 4B-8.5 x 2.5 |
|
| RC SR-30.0 |
RC SB-24.0 x 18.0 |
RC 2B-6.5 x 2.0 |
RC 4B-9.5 x 2.5 |
|
| |
RC SB-28.0 x 22.0 |
RC 2B-7.0 x 2.0 |
RC 4B-10.0 x 1.8 |
|
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RC SB-30.0 x 23.0 |
RC 2B-7.0 x 2.5 |
RC 4B-10.0 x 3.1 |
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Solid Round rods and tubes other than above sizes on
request. All tubes are open at both ends.
Solid Rod/Tube length 25 to 1500mm depending on outer Diameter. Specific length size on enquiry. Please do not
fail to specify length of Solid Rod/Tube in purchase enquiry.
Duralox 997 single and multibore tube insulators are
used for insulating thermocouple wires suitable for maximum temp>1800°C according to DIN43725 standards. Tube
sizes other than as above shown in table can be made on request if found feasible. Dimensional tolerances are
maintained to DIN 40680 medium class Standards.
Following ref. code numbers correspond to :
RC SR = Recrystallised Solid Rod, RC-SB = Recrystallised Single Bore Tube, RC-2B = Recrystallised 2 Bore Tube,
RC-4B = Recrystallised 4 Bore Tube, RCO-2B = Recrystallised Oval 2 Bore Tube.
Duralox stand for Durable Aluminum Oxide and is a registered
trade name of Jyoti Ceramic Industries Pvt. Ltd. For Aluminum Oxide ceramic composite containing 90 to 99.7%
& above percentage Al2O3 in its residue.
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