Designed to manage the atmosphere history required for ESC ceramicAir / N₂ / N₂+H₂ / Dry-Wetdebinding, sintering and finishing in a single gas-tight chamber. Vacuum/purge atmosphere exchange and controlled humidification are combined to manage material state and process repeatability.
An electrostatic chuck holds a wafer by electrostatic force, so the ceramic body, embedded electrode and surface condition must be engineered as one functional component.
An ESC is a composite ceramic component with embedded electrodes and a functional wafer-clamping surface. Temperature, atmosphere, water-vapor partial pressure and cooling history during firing therefore affect not just one material, but all three functional regions:ceramic body / embedded electrode / surfacesimultaneously.
The process flow below compares sources of variation in multi-furnace processing with what can be controlled when compatible steps are integrated.
The sequence below is an engineering example. Air-step temperature, H₂ ratio, dew point and hold time are set individually for the ceramic/electrode system.
By controlling the dry/wet flow ratio and dew point, the H₂/H₂O atmosphere can be reproduced as a defined process condition.
At high temperature, the H₂/H₂O ratio is related to oxygen potential. Changing dry/wet conditions can therefore be used to develop surface-state and electrode oxidation/reduction conditions.
The table links process parameters directly to the intended material effect.
The actual chamber image shows the relationship among the work zone, W rod heaters, insulation and control/gas systems.
Each card connects furnace capability to the process reason it matters.
Densify the ESC ceramic body at high temperature and develop target material properties.
Heat treat under a reducing atmosphere while managing the oxidation state of embedded electrodes and interfaces.
Switch dry/wet conditions and evaluate pH₂O and dew point as reaction variables.
Consolidate compatible steps in one chamber to reduce inter-equipment transfer and ambient exposure.
The following is one manufactured system example. Chamber size, batch quantity and atmosphere sequence are customized to the ESC process.
Key questions typically reviewed during early-stage ESC furnace planning.
Yes. Vacuum evacuation or reduced-pressure purge can be incorporated to exchange atmospheres before and between process steps. Pump configuration and target pressure are selected according to chamber volume, workpiece outgassing and required residual O₂/H₂O levels.
Yes. The chamber and gas system can be designed for atmosphere switching. Because heater-protection requirements differ between Air and high-temperature N₂/H₂ operation, temperatures, purge conditions and switching sequences are engineered individually.
To adjust water-vapor partial pressure and dew point of the inlet gas so the H₂/H₂O ratio can be managed as a process condition. Dew-point measurement is added according to required accuracy.
It reduces transfers, waiting and air exposure, while making purge conditions, H₂ ratio, dew point and thermal history easier to manage in one recipe.
No. W550 × D550 × H600 mm is one example. Chamber size is engineered from ESC dimensions, batch quantity, fixtures, temperature distribution and throughput.
We review workpiece dimensions, debinding/sintering/finishing temperatures, Air/N₂/H₂ conditions, vacuum exchange, dry/wet and dew-point requirements, and the process steps to integrate, then define furnace materials, heaters, gas system, humidification, exhaust and safety requirements.
