Teflon Coated Ceramic End Effector – Non-Stick Surface for Sensitive Wafer Handling

St.Cera’s Teflon (PTFE) coated ceramic end effector combines a high-strength alumina substrate with a uniform, low-friction PTFE coating (thickness 15–30 μm). The coating provides an extremely low coefficient of friction (≤0.1), excellent chemical resistance, and non-stick properties, preventing wafer adhesion and eliminating backside contamination. The underlying ceramic substrate (99.8% Al₂O₃) offers high flexural strength (361–1000 MPa), wear resistance, and thermal stability up to 260°C (coating limit). This end effector is ideal for handling delicate, thin, or sticky wafers (e.g., after photoresist coating or chemical processes).

Specifications (based on 99.8% Al₂O₃ substrate with PTFE coating):

Note: PTFE coating limits maximum temperature to 260°C; for higher temperature applications, consider uncoated ceramic or other coatings.

Applications:

• · Handling wafers after photoresist coating (sticky surfaces)
• · Transfer of thin or fragile wafers (prevents sticking)
• · Semiconductor inspection and metrology tools
• · Cleanroom automation where particle contamination must be minimized

Manufacturing Process:

Ceramic substrate sintered and precision ground → surface roughening (plasma etch or grit blast) → PTFE spray coating → heat curing at 380°C → final inspection. Each end effector is checked for coating thickness (eddy current), adhesion (cross-cut test ASTM D3359), and coefficient of friction.

Quality Control:

100% visual inspection for pinholes or bubbles; coating thickness uniformity within ±5 μm; no delamination after 90° bend test on witness coupon. Dimensional check to OEM tolerance (length ±0.05 mm, flatness ≤0.1 mm).

Advantages over Uncoated or Other Coatings:

• · Non-stick surface prevents wafer adhesion and breakage
• · Lowest coefficient of friction among ceramic coatings
• · Excellent chemical resistance (acids, bases, solvents)
• · Reduces particle generation by preventing material transfer

Limitations (remarks on material deviation):

The PTFE coating is not derived from the provided material property tables (Al₂O₃, ZrO₂, Si₃N₄, BeO). The substrate properties strictly follow the supplied datasheet (99.8% Al₂O₃). Coating properties are based on industry-standard PTFE specifications, as no coating data was provided. For applications exceeding 260°C, an uncoated ceramic end effector is recommended.*

Customization:

Available in lengths 150–1500 mm, tip shapes (edge grip, Bernoulli, flat), mounting flange patterns per OEM drawing. Partial coating (only contact areas) or full coverage optional.

Request a sample for adhesion and friction testing.