FORM 04
Ceramic Plates
Flat plates and substrates where flatness, insulation and wear resistance decide the part.
Material detailsFORM 11
Ceramic Discs
Machined discs with concentric features for seats, wear faces and rotating duty.
Advanced Industrial Ceramics
On a disc the controlling feature is usually a face, not the outside diameter. Flatness, and the area over which it holds, decide whether the disc seals, seats or runs true.
Concentric grooves and a ring of holes are formed before firing, so their positions and the thickness tolerance are fixed early. Both are easier to hold when they are agreed before the tooling is made.
Specification and control points
| Material system | Alumina · Silicon carbide · Silicon nitride |
|---|---|
| Outside diameter | Ground to your drawing |
| Thickness | To drawing, with tolerance stated |
| Face flatness | Stated, and the area over which it applies |
| Concentricity | Stated against the datum diameter |
| Machined features | Grooves, bores, counterbores and hole patterns |
| Surface | As-fired · Precision ground · Lapped |
FORM 11Alumina machined disc — supplied part photograph
Part photographs
Ceramic Discs parts photographed
Supplied photographs for this catalogue entry. Captions describe the geometry in each frame — ask us for drawings and grades with your enquiry.
Discs with radial slots and a stepped boss
Disc with concentric grooves and a bolt circle
Zirconia discs with four holes and a raised rim
Flanged silicon nitride discs
Thin silicon nitride discs
Round chucks with a chord flat
Typical applications
Applications this form is specified for
The industries below are the applications this material system is most often specified for. Tell us your own duty and we will confirm whether it is the right grade.
Valve and seat facesWear faces under rotation or slidingPump, meter and rotary equipment componentsSealing and backing facesSupport and mounting plates
Made to your requirement
What is defined with you before production
- Which face is the functional face
- Flatness, and the area it applies to
- Concentricity, and between which features
- The mating part, and how the disc is located
Supply stage
Sample part first, then batch production on the same material and process basis. Ask for the material data sheet with your quotation.
Related pages
Forms and materials to compare
Al₂O₃
Alumina Ceramics
High-purity alumina for insulation, high-temperature containment and structural duty where strength and electrical isolation have to hold at the same time.
Material detailsFORM 05
Ceramic Rings
Ground rings and sealing elements for assemblies that must hold a bore or a face at temperature.
Material details