Product Description
Aluminum oxide 99.3%Min Sintered White Tabular alumina for refractory purging plugs
Tabular aluminas are fully shrunk coarse crystalline alpha aluminas that have been converted to their corundum form. Tabular alumina is produced by sintering ball-formed, intermediately burned calcined alumina at a temperature just under the 2040º C melting point of aluminum oxide. These tabular alumina balls are then crushed, graded or screened, ground and blended to a wide range of granular or powdered particle size distributions. Hongtai’s (AC99) tabular alumina is available as low or ultra-low soda, de-ironed and de-dusted and in a wide variety of packages.
Production Process
Aluminum oxide 99.3%Min Sintered White Tabular alumina for refractory purging plugs
A pelletizer is used to form balls from fine calcined alumina continuously ground to maximise the green strength and forming capability of the alumina. Use of an organic binder gives temporary cohesion. The addition of boron is possible to reduce soda during heating. The balls are dried before being loaded into the kiln. The key stage is the continuous sintering of the balls, with diameter from 6-26mm, at very high temperatures. In a 9m high vertical shaft kiln, for example, equipped with gas burners, temperatures can exceed 1900°C in the hottest zone. The balls take 15 hours to descend through the furnace, following a heating and cooling cycle. After sintering the balls have low residual porosity because they have shrunk by 20%. They are then crushed, ground, iron is removed magnetically, and finally screened into a range of grain size distributions from 45µm to 10mm.
Properties
Aluminum oxide 99.3%Min Sintered White Tabular alumina for refractory purging plugs
Tabular alumina is made up of grains of alpha alumina with a diameter of 50 to 300 µm, formed by crystalline growth during sintering. It is dense, >3.55g/cm-3, and only slightly porous, < 5%. Its spherical porosity is mainly closed - water absorption: 1.5% - preventing cracks from spreading. High purity tabular alumina can be produced (99.8% Al2O3, Na2O < 1000 ppm) aided by the absence of non-volatile mineral additions in the preparation of green balls. It is therefore very refractory and not subject to high temperature creep.
• Chemical inertness – resistant to most alkalis and mineral acids
• High-density
• Low water absorption
• Extreme hardness
• High thermal conductivity
• Good resistance to thermal and mechanical shock
• High heat capacity
• High electrical resistance
• Excellent abrasion resistance
Technical Data
Aluminum oxide 99.3%Min Sintered White Tabular alumina for refractory purging plugs
Packaging & Shipping
Aluminum oxide 99.3%Min Sintered White Tabular alumina for refractory purging plugs
Packing Details:
Sintered Tabular Alumina packed with plastic bags, with water-proof cover , and tightened with plastic bandages.
Sintered Tabular Alumina Shipping:
By vessel or train from Chinese ports.
About Us
Our competitive Advantage:
1.Competitive Price. Make the products competitive in your market.
2.Quick Response:We promise quick response at the very first moment when we received your request. 3.Superior Customer Service:The company provides after sales service ensuring customer’s satisfactions,we believe in Long term partnership bringing loyalty.
4.We had been on this filed for many years and we have our own research team,the prouduction process could be concrolled strictly.
5.We have developed stable customer base overseas and kept long-term cooperation.
FAQ
1. How you can control your quality?
For each production processing, we have complete QC system for the chemical composition and Physical properties. After production, all the goods will be tested, and the quality certificate will be shipped along with Sintered Tabular Alumina.
2. What's your delivery time?
It usually needs about 15days- 30 days after receiving the deposit.
3.Do you have any experiences of export?
Yes,and Now we have gained a global sales network reaching Taiwan, Russia, Korea, Vietnam, Pakistan, Bulgaria, French, India, Congo, Angola, South Africa, and so on.
4. Do you provide free samples?
Yes, we can provide a free sample for testing, If we have sample in stock, The quantity based on the material type, The buyer should bear all the shipping costs.
5. Can we visit your Company?
Yes, certainly. You are very welcome to China and we will be honored to have a customer and friend.
