Alumina Ceramic (Al₂O₃)
A high-purity technical ceramic with extreme hardness, thermal stability, and electrical insulation. AM-produced alumina is used for complex ceramic components that are impossible to machine — including catalyst supports, electrical insulators, and biomedical implants.
About Alumina Ceramic (Al₂O₃)
Alumina (Al₂O₃) is the most widely used technical ceramic, valued for its hardness (1,500–1,700 HV), thermal stability (up to 1,700 °C), and electrical insulation properties. Traditional manufacturing is limited by the extreme difficulty of machining fired ceramics — AM bypasses this by forming the geometry in the green (unfired) state.
AM alumina is typically produced by binder jetting or stereolithography using ceramic-loaded slurries, followed by debinding and sintering at 1,500–1,700 °C. Shrinkage during sintering (15–22%) must be compensated in the digital design. Achievable density after sintering is typically 95–99% theoretical.
Typical Applications
- Electrical insulators and substrates
- Catalyst supports and chemical reactors
- Wear-resistant components
- Biomedical implants
- High-temperature furnace components
Engineering Considerations
- Significant shrinkage during sintering — dimensional compensation required
- Brittle — zero tolerance for impact or tensile loading
- Very limited supplier base for ceramic AM
- Long lead times due to debinding + sintering process (days to weeks)
- Surface finish post-sintering is rough — grinding/polishing may be required