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Product description
Our company mainly produce alumina tubes etc, especially thermalcouple protection tube, insulation tube, and furmace tube etc. Meanwhile, we also produce 95-99.7% alumina crucibles, boats, insulating parts, rods, wear resistance parts, high temperature ceramic parts etc products, which are mainly used in thermalcouple temperature, liquid steel continous temperature, various industrial furnace(containing vacuum furnace, carburizing furnace, wire furnace, atmosphere furnace etc), especially widely used in petrochemical, spinning, electric, instrumentation, mechanical workout, military project etc industry.
1. Main performance index
|
Serial number |
Performance index |
Measuring unit |
High purity alumina |
Alumina |
High alumina |
|
1 |
Al2O3 |
% |
99.7 |
99.3 |
85 |
|
2 |
SiO2 |
% |
less than0.1 |
— |
— |
|
3 |
Density |
g/cm3 |
3.95 |
3.88 |
3.2 |
|
4 |
Wter absorption |
% |
0 |
0.01 |
0.2 |
|
5 |
Cld compressive strength |
MPa |
450 |
350 |
200 |
|
6 |
20 degree Celsius leak rates |
Torr/L.sec |
less than10-11 |
less than10-11 |
less than10-11 |
|
7 |
Twisting in high temperature |
mm |
1700 degree Celsius 0.2 allowance |
1600 degree Celsius 0.2 allowance |
1400 degree Celsius 0.2 allowance |
|
8 |
Bonding in high temperature |
|
1700 degree Celsius non-caked |
1600 degree Celsius non-caked |
1400 degree Celsius non-caked |
|
9 |
20—1000 degree Celsius coefficient of
thermal expansion |
mm.10-6/degree Celsius.m |
8.6 |
8.2 |
8.2 |
|
10 |
Thermal conductivity |
W/m.k |
25 |
25 |
25 |
|
11 |
Electric insulation strength |
KV/mm |
20 |
20 |
15 |
|
12 |
20 degree Celsius direct current
insulating resistance |
Ohm/cm |
1014 |
1014 |
1014 |
|
13 |
High-temperature
insulation resistance |
1000 degree Celsius MΩ |
≥0.08 |
≥0.08 |
≥0.08 |
|
1300 degree Celsius MΩ |
≥0.02 |
≥0.02 |
≥0.02 |
|
14 |
Thermal shock resistance |
|
1550 degree Celsius 6 times not cracked |
1550 degree Celsius 6 times not cracked |
1300 degree Celsius 3 times not cracked |
|
15 |
Maximum service temperature |
degree Celsius |
1900 |
1800 |
1400 |
|
FURNACE TUBE(SLIP CASTING) |
|
OD*ID(MM) |
L(MM) |
|
24*18 |
LESS THAN 1750 |
|
25.4*19.1 |
|
27*20 |
LESS THAN
1600 |
|
28.6*22.5 |
|
30*23 |
|
32*25 |
|
34.9*28.6 |
|
35*27 |
|
38.1*31.8 |
|
40*30 |
|
42*34 |
|
44.5*38.1 |
|
46*38 |
|
47.6*41.3 |
|
50*40 |
|
50.8*44.5 |
|
57.2*50.8 |
|
58*48 |
|
60*50 |
|
63.5*57.2 |
|
65*55 |
|
69.9*63.5 |
|
70*60 |
|
76.2*70 |
|
80*70 |
|
89*79.5 |
|
89*82.5 |
|
101.5*93 | 
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