AD-998 is a high-purity alumina ceramic with a minimum alumina content of 99.8%. It exhibits a density of 3.92 g/cm¬= and offers excellent mechanical properties, including a flexural strength of 360 MPa and a compressive strength of 2700 MPa at room temperature. The material has a hardness of 14.1 GPa and a fracture toughness ranging from 4 to 5 MPa m1/2, making it suitable for demanding applications requiring durability and resistance to wear. Thermally, AD-998 has a thermal conductivity of 30.0 W/m K and a coefficient of thermal expansion of 8.2 x 10^-6/¬8C, which indicates good thermal stability. Its dielectric properties include a dielectric strength of 8.7 kV/mm and a volume resistivity greater than 10^14 ohm-cm at room temperature, making it an effective electrical insulator. The material is also characterized by low dielectric loss, with a tan delta value of less than 0.0001 at 1 MHz. AD-998 is manufactured using advanced processes such as injection molding and isostatic pressing, allowing for precision and customization in various applications. This product is ideal for engineers seeking high-performance ceramics for applications that require superior mechanical strength, thermal stability, and electrical insulation.
Aluminas (aluminum oxide, Al2O3) are the most commonly used technical ceramics due to their generally useful properties and good price/performance ratio. Alumina ceramics are commonly subdivided according to their alumina content ranging from 80% to more than 99%. Higher purity alumina demonstrates enhanced wear and corrosion resistance — creating a continuous scale of various alumina grades, compositions, and performance.
Aluminas are used in both general use and specialized applications. A grade is selected to fit the application environment. Alumina compositions and microstructures can be formulated to meet the specific performance requirements of more demanding applications.
Ceramic Expertise
As a leading technical ceramics manufacturer, CoorsTek offers an extensive line of aluminas. Our ceramics experts tailor the choice of alumina grade to meet the specific application requirements.
CoorsTek has developed over 100 unique alumina compositions, optimized for specific application requirements. Let our experts help you determine the best-fit material for your application.
| CoorsTek | |
|---|---|
| Product Category | Industrial Ceramic Materials |
| Product Number | AD-998 |
| Product Name | Alumina Engineered Ceramics |
| Material Type | Alumina |
| Composition | 99.8% Al2O3 |
| Applications | Injection Molding, Roll Compacting, Extruding, Co-firing, Isostatic Pressing, Dry Pressing, Hot Pressing, Tape Casting, Slip Casting |
| Performance Features | Machinable ceramic |
| Max Use Temperature | 1800 C (3272 F) |
