In the world of advanced materials, Tabular Alumina stands out due to its exceptional physical and thermal properties. It’s a high-purity sintered alumina extensively used in refractory, keramiek, en polijsttoepassingen.
What is Tabular Alumina?
Tabulair aluminiumoxide, essentially alpha alumina, is one of the most thermally stable types of alumina. It’s characterized by its high purity, complete crystallization, and well-developed crystallography. This high-density, fully shrunk, coarse crystalline alpha alumina is derived from the sintering process in an ultra-high temperature shaft kiln. The name ‘tabular’ is derived from its tablet-like, or tabular, crystals formed during the heating process.
Unique Characteristics of Tabular Alumina
Tabular Alumina is known for its:
- High Refractoriness: It exhibits exceptional resistance to high temperatures and chemical reactions.
- Hoge dichtheid: This enables resistance to abrasion and impact, making it a perfect choice for many industrial applications.
- Low Porosity: Its low porosity minimizes the infiltration of slag, metaal, and gases.
- Weerstand tegen thermische schokken: Its large crystal size and closed porosity impart excellent thermal shock resistance.
The Production Process of Tabular Alumina
Raw Material Preparation
The production process starts with the careful selection of raw materials. High purity calcined alumina is used, usually having purity above 99.5% Al2O3.
Forming and Pre-sintering
The raw alumina is formed into a specific shape and pre-sintered at a temperature of around 1000°C to eliminate mechanical stresses.
High-temperature Sintering
Het gevormde aluminiumoxide wordt vervolgens gesinterd in een schachtoven op hoge temperatuur bij temperaturen boven 1900°C, resulterend in een hoge dichtheid, helemaal gekrompen, grof kristallijn alfa-aluminiumoxide.
Verpletteren en sorteren
Het gesinterde aluminiumoxide wordt geplet, en de korrels worden gescheiden door een rigoureus sorteersysteem om tabulair aluminiumoxide van hoge kwaliteit te produceren.
Toepassingen van Alumina in tabelvorm
In vuurvaste materialen
De primaire toepassing van Tabular Alumina is de vervaardiging van hoogwaardige vuurvaste materialen. Zijn hoge vuurvastheid, hoge dichtheid, lage porositeit, and resistance to thermal shock make it an excellent material for lining furnaces, ovens, incinerators, and reactors.
In Ceramics
In ceramics, Tabular Alumina is used as a raw material due to its hardness and resistance to wear and corrosion.
In Abrasives and Polishing
The hardness of Tabular Alumina also makes it an excellent material for abrasives. It’s used in grinding wheels, schuurpapier, en andere schurende producten. In aanvulling, it’s used for polishing applications, where it provides a smooth, high-gloss finish.
Conclusie
Tabulair aluminiumoxide, with its unique characteristics and wide range of applications, is poised to be a significant player in the advanced materials market. As industries continue to innovate and seek high-performance materials, the demand for Tabular Alumina is set to rise further. Its role in shaping industries, from refractories to ceramics and abrasives, continues to expand, heralding exciting possibilities for this versatile material.
