It is processed by tunnel kiln at high temperature. The sagger is filled with low-sodium alumina powder as the raw material. The calcination temperature is above 1450ºC and the heat preservation is above 12 hours. Special additives are added to control the high-temperature alumina product through high temperature and additive sodium discharge The content of sodium oxide. Low-sodium high-temperature alumina has the advantages of high alpha phase conversion, high hardness, low sodium content, high purity, stable thermal performance, low shrinkage, high porcelain density, good electrical insulation, and high thermal conductivity. It is especially suitable for the production of more than 92% corundum and ceramic products, especially 95% alumina porcelain, which is widely used in water valve discs, sealing rings, ceramic materials, textile machinery and other wear-resistant ceramics. Low sodium and high temperature alumina is also used in spark plugs, Electronic ceramics such as vacuum tube shells have high strength and wear resistance. Uses of low sodium and high temperature alumina: 1. Electronic ceramics such as electronic vacuum envelopes and spark plugs. 2. Wear-resistant ceramics such as papermaking machinery, sealing rings, textile machinery, etc. 3. High temperature materials such as alumina crucible and porcelain tube. 4. High-frequency insulating porcelain, LCD substrate glass, ceramic glaze, etc.
Specification
| item |
impurity content≤(%) |
ΑL2O3≥(%) |
α- ΑL2O3 ≥(%) |
True Density≥(g/cm3) |
Original grain size (μm) |
|
| |
Nα2O |
SiO2 |
Fe2O3 |
|
|
|
|
| AT-L |
0.1 |
0.05 |
0.05 |
99.6 |
96 |
3.96 |
1~3 |
FAQ
Q: Are you factory?
A: Yes, we are factory.
Q: How is your quality?
A: We have top grade production equipment and precision measuring instruments and we also have engineers and technicians carry out quality control.
Q: Can you supply free samples?
A: 1kgs free sample is available, but freight charges will be at your account, The charges will be return to you or deduct from your order in the future.
Q: What about the payment?
100% T/T in advance, 30% T/T in advance, the balance 70% against the B/L copy, Irrevocable L/C at sight
Q: The MOQ is?
A: MOQ is usually 1 ton, special products can be coordinuted with each other.
Q: Can I visit your factory?
A: Yes, we welcome you to visit our factory at anytime
Q: How about your delivery time?
A: Usually the shipment is within 15 days after confirming receipt of your payment, some products maybe need longer time.
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