High Purity Alumina Crucibles for metals melting, ceramic powders
heat treatment, annealing, fusion processes
Alumina (Al2O3) is one of the most important ceramic oxides which
is widely used for structural, electronics, medical and electrical
fields. Alumina has wide application as engineering technical
ceramic due to its high hardness value, high abrasion (wear)
resistance and low cost. It has high melting point (2054 °C), and
boiling point (2977 °C) low thermal expansion and high compressive
strength which provides good thermal shock resistance. Alumina is
one the best electrical insulations at high temperatures making it
excellent choice as a thermodielectric refractory and is
transparent to microwave radio frequencies. It’s fairly high
chemical stability, make Alumina a good material to withstand
chemical corrosion. ZG is producing a broad range of analytical
grade, recrystallized, dense Alumina crucibles in various sizes and
forms. Custom solutions available upon request.
Alumina crucibles are the material of choice for a wide range of
general purpose laboratory and industrial applications. Alumina has
wide application as a crucible ceramic due to its high hardness
value, high abrasion (wear) resistance, high corrosion resistance
and low cost compared with other refractories. It has high
compressive strength which provides good thermal shock resistance.
High purity Alumina is one the best electrical insulations at high
temperatures making it excellent choice as a thermodielectric
refractory and is transparent to microwave radio frequencies.
ZG recrystallized Alumina t-ceramics Crucibles Key Features:
- 1750 C Service temperature
- 99.7% Alumina content, less than 300ppm Fe2O3
- Excellent chemical resistance to acids, bases & organics even at
elevated temperatures
- Low porosity and fine surface finish enhance cleaning and prevents
chemical attack
- Superior mechanical strength and wear resistance
- Consistent dimensional control
- State-of-the-art crucibles manufactured by the most cost-effective
process.
Related Data
| Main component | 99%Al2O3 | S-SiC | ZrO2 | Si3N4 |
|
Physical
Property | Density | g/cm3 | 3.9 | 3.1 | 6 | 3.2 |
| Water Absorption | % | 0 | 0.1 | 0 | 0.1 |
| Sinter Temperature | °C | 1700 | 2200 | 1500 | 1800 |
Mechanical
Property | Rockwell Hardness | HV | 1700 | 2200 | 1300 | 1400 |
| Bend Strength | kgf/mm2 | 3500 | 4000 | 9000 | 7000 |
| Compression Intensity | Kgf/mm2 | 30000 | 20000 | 20000 | 23000 |
Thermal
Property | Maximum working
temperature | °C | 1500 | 1600 | 1300 | 1400 |
thermal expansion
coefficient
0-1000°C | /°C | 8.0*10-6 | 4.1*10-6(0-500°C) | 9.5*10-6 | 2.0*10-6(0-500°C) |
| 5.2*10-6(500-1000°C) | 4.0*10-6(500-1000°C) |
| Thermal Shock resistance | T(°C) | 200 | 250 | 300 | 400-500 |
| Thermal Conductivity | W/m.k(25°C | 31 | 100 | 3 | 25 |
| 300°C) | 16 | 100 | 3 | 25 |
Electrical
Property | Resisting rate of Volume | ◎.cm | | | | |
| 20°C | >1012 | 106-108 | >1010 | >1011 |
| 100°C | 1012-1013 | – | – | >1011 |
| 300°C | >1012 | – | – | >1011 |
Insulation Breakdown
Intensity | KV/mm | 18 | semiconductor | 9 | 17.7 |
| Dielectric Constant (1 MHz) | (E) | 10 | – | 29 | 7 |
| Dielectric Dissipation | (tg o) | 0.4*10-3 | – | – | – |
Applications.
Analytical applications, metals melting, ceramic powders heat
treatment, material acid treatment even at elevated temperature,
crucibles for annealing, crucibles for fusion processes, crucibles
for crystal growing, crucibles for extremely corrosive
environments, like plasma etching
