Al2O3 Alumina Ceramic Parts
99% Al2O3 Alumina Ceramic Sheets and Blank Plates
Single piece minimum order for wear plates and insulating blanks
A blank plate is where most ceramic projects start: one piece to machine, test or fit before any tooling is committed. These 99% alumina sheets are supplied from a minimum order of one piece, with samples in 4 to 7 working days. The body runs 3.85 g/cm3 with 99% alumina content, zero water absorption and zero gas permeability, 330 MPa flexural strength, 2000 MPa compressive strength and service to 1650 degrees C.
Key Benefits
- Minimum order quantity of one piece, so a single trial plate is not a problem
- 2000 MPa compressive strength and 330 MPa flexural strength in a 99% alumina body
- Zero water absorption and zero gas permeability for vacuum and sealing duty
- Dielectric strength above 10 kV/mm with volume resistivity above 10^14 ohm cm
- Thermal conductivity 27.5 W/m K carries heat away while staying an insulator
Problems It Solves
- Ceramic suppliers refusing single piece prototype orders
- Wear plates in steel that groove and need replacing repeatedly
- Needing an insulating plate that also has to conduct heat out of an assembly
Who It Is For
- Engineers prototyping a ceramic part before committing to tooling
- Maintenance teams cutting their own wear liners from blank stock
- Electronics designers needing an insulating plate with a real thermal path
Application Scenarios
Wear plates and liners on machinery
Insulating plates in electrical and electronic assemblies
Blanks for in house machining and prototyping
Chemical and petroleum process equipment
Technical Features
- Density 3.85 g/cm3 with 99% alumina content
- Rockwell hardness 92 HRA, Mohs grade 9, Vickers 15.7 GPa
- Flexural strength 330 MPa, compressive strength 2000 MPa, fracture toughness 4 MPa m1/2
- Thermal conductivity 27.5 W/m K, thermal expansion 7.6 x 10-6 per degree C, thermal shock 200 delta T
Manufacturing Process
Raw material preparation, forming, surface grinding, internal and external diameter grinding and precision CNC machining are all carried out in house.
Materials
- 99% Al2O3 alumina ceramic
Specifications
| Material | 99% Al2O3 alumina ceramic |
|---|---|
| Colour | White or black |
| Size | Customized |
| Minimum order quantity | 1 pc |
| Sample time | 4-7 working days |
| Density | 3.85 g/cm3 |
| Alumina content | 99% |
| Water absorption | 0 |
| Gas permeability | 0 |
| Rockwell hardness | 92 HRA |
| Flexural strength at 20 C | 330 MPa |
| Compressive strength at 20 C | 2000 MPa |
| Fracture toughness at 20 C | 4 MPa m1/2 |
| Modulus of elasticity | 350-400 GPa |
| Thermal conductivity 20-400 C | 27.5 W/m K |
| Thermal expansion coefficient | 7.6 x 10-6 per degree C |
| Thermal shock resistance | 200 delta T degrees C |
| Maximum use temperature | 1650 degrees C |
| Dielectric strength | greater than 10 kV/mm |
| Dielectric constant | 9.1 |
| Dielectric loss angle at 1 MHz | 0.0002-0.0003 |
| Volume resistivity at 20 C | greater than 10^14 ohm cm |
Figures are taken from the published product specification. Values not listed are marked TBC and confirmed against your drawing before quotation.
Quality Control
- Thickness and flatness checked against the drawing before packing
- Edges inspected for chips on thin plates
- Inspection report issued to your drawing on request
Certifications
No third party certification documents are published for this product. Every shipment is inspected to your drawing with an inspection report issued. Certification status is TBC and confirmed on request.
Customization Options
- Size customized, plates supplied white or black
- Holes, slots and chamfers machined before firing where possible
- Single piece orders accepted for prototyping
Comparison With Other Ceramics
The 99% body is the higher purity plate with better dielectric performance and higher strength than 95% alumina, which is the cheaper option for purely mechanical duty. Where the plate takes impact rather than abrasion, zirconia is the tougher alternative.
Use Guide
- Machine features before firing wherever possible; post sintering machining needs diamond tooling
- Support the plate across its full face when clamping so it is not loaded in bending
- Quote the flatness requirement separately from the thickness tolerance
Industries Using This Part
99% Al2O3 Alumina Ceramic Sheet Blank Plate FAQ
Can I order a single plate?
Yes. The minimum order quantity is 1 piece, with sample time of 4 to 7 working days.
What is the flexural strength?
330 MPa at 20 degrees C, with compressive strength of 2000 MPa.
Is the plate gas tight?
Gas permeability and water absorption are both zero on the 99% alumina body.
What is the maximum service temperature?
1650 degrees C.
How good is the electrical insulation?
Dielectric strength is above 10 kV/mm, dielectric constant is 9.1 and volume resistivity at 20 degrees C is above 10^14 ohm cm.
Can I have the plate cut to my outline?
Yes. Size is customized. Send your drawing with the outline and thickness.
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Send a 2D or 3D drawing with the critical dimensions marked. Samples are free of charge and delivered in 4 to 7 working days.
Send a 2D or 3D drawing by WhatsApp or email. Samples in 4 to 7 working days.