Precision CNC Machined
Ceramic & PEEK Mating Metal Seats

HXC calculates the thermal expansion difference between the metal seat and ceramic/PEEK component over the full operating temperature range (room temperature to maximum process temperature). The seat bore diameter is machined with a clearance large enough that the metal never creates compressive hoop stress on the ceramic at maximum temperature — yet small enough for accurate positioning. Calculation data is included in the DFM report.

Protection measures: (1) Uniform contact surfaces — no sharp edges or step features that create stress concentrations; (2) Specific assembly torque limits engraved or labelled on threaded metal components (ceramic and PEEK crack at torque values that would be normal for all-metal assemblies); (3) Assembly instructions provided — including recommended torque sequence, assembly tool type, and temperature-dependent re-torque schedule.

HXC recommends three-point kinematic contact (three raised pads on the seat face, each Ra 0.4 µm, at equal 120° spacing) for ceramic disc components. This provides accurate, repeatable positioning while allowing the ceramic to expand or contract radially without constraint. For rectangular ceramic components: four-corner support pads with the same kinematic principle.

Yes — HXC supplies complete matched kits : metal seat + ceramic or PEEK component (sourced from HXC's supply chain or customer-furnished) + assembly hardware + assembly instructions. All components are dimensionally verified as a matched set. Assembly compatibility (clearances at room temperature and at maximum operating temperature) is confirmed before shipment.

SUS316L (to 300°C) : standard for most semiconductor process temperatures. Inconel 625 (to 500°C+) : for high-temperature process applications where Al and standard stainless cannot be used. Al 6061 : for room-temperature and mild-process-temperature applications where weight is important. Material selection depends on process temperature, process chemistry, and the specific ceramic or PEEK material used.

After assembly, HXC performs: (1) Visual inspection — no cracking, no visible stress whitening in PEEK, no chipping; (2) CMM measurement of the assembled component position relative to the seat datum; (3) Cold-cycle test (for temperature-critical applications) — assemble, cool to minimum operating temperature, warm to maximum operating temperature, verify position and inspect for damage.

Prototype: 7–10 days. Matched kits: 8–12 days. Batch: 12–18 days.