Alumina is the most widely used technical ceramic and is the material of choice in about 80% of engineering applications due to its combination of properties. Fired at over 1600°C (2900°F) to give a fully dense technical ceramic, alumina exhibits high mechanical strength, rigidity and can be machined to tight tolerances and fine surface finishes. Alumina is often used as a replacement for metallic components in demanding engineering applications.
Abrasion resistance – Technical ceramics are very hard and resistant to abrasion. Alumina is ideal for the manufacture of wear-resistant inserts or products (e.g. mill or chute linings, cam discs, location or centering pins for welding, thread guides and friction discs for textiles, etc.).
Thermally stable – Can be used in both oxidizing and reducing atmospheres up to 1600°C (2900°F) and in vacuum furnaces up to 2000°C (3600°F).
Chemical resistance – Chemically inert and is not corroded by water or steam. It offers good resistance to strong acids and alkalis at elevated temperatures and is ideal for applications where resistance to corrosive substances is required. Alumina is often used for catalyst supports operating at high temperatures. It is also an obvious choice for pump and valve components when its excellent abrasion resistance is considered.
Electrical insulation – Widely used as an electrically insulating material, particularly the higher purity grades which have enhanced resistivity. It can be used for insulators operating at elevated temperatures (e.g. furnace lead-in tubes, fuel cells).
Thermal conductivity – Excellent electrical insulator it has reasonably high thermal conductivity for a ceramic. It is often used as a substrate for semiconductors and high-performance heat sinks and thermal control products.
The strong all-around performance of alumina has long been proven in some demanding applications including the automotive, aerospace, defence, medical, electrical and heat treatment industries.
Alumina is a highly flexible material when it comes to product development, and we are always working with design engineers and system manufacturers to come up with new applications. Alumina components can be threaded, perforated, rebated, slotted, hollowed or tapered to suit thousands of design and performance demands. Complex shapes are often achievable, and they also lend themselves to surface treatments where required, such as precision grinding and lapping.
Hunan Ketao China Industry Co., Ltd. offers a range of premium quality alumina materials, from 90% right up to 99.7% alumina.
Hunan Ketao China Industry Co., Ltd. manufactures a low-density, porous, machinable cordierite ceramic material that can be easily machined. Our LWS machinable cordierite can be supplied as either CNC machined components (to suit your specific design) or as blanks to allow you to machine your own items. LWS machinable cordierite is Easy to machine using standard tungsten carbide cutting tools
Pre-fired to ensure your machined component is dimensionally stable
Able to be fired repeatedly to temperatures up to 1300°C (2400°F)
Exhibits a very low coefficient of thermal expansion to minimise size change in use
Gives finished products that are low density and thermally insulating
Blanks can be supplied as blocks up to 500 x 500 x 50mm, allowing quite large items to be machined
For machined components, you can request single items or small quantities. We can work from your own AutoCAD or SOLIDWORKS design files or our in-house team can prepare a bespoke design based on your concept.
We also offer blanks for sale should you wish to machine your own components.