Porous suction cup alumina porous ceramic vacuum chuck wafer dicing adsorption platform

A porous vacuum chuck is a precision handling and fixing device that forms a large-area, uniform negative-pressure zone through evenly distributed, interconnected micropores inside the material, achieving "surface-contact" adsorption. Compared with conventional single-hole chucks, its greatest advantage is the uniform distribution of adsorption force, which effectively avoids stress concentration. It is therefore particularly suitable for handling and processing fragile, ultra-thin, irregularly shaped, or high-value workpieces such as semiconductor wafers and glass substrates. In the semiconductor manufacturing, precision electronics, and optical glass industries, it plays the role of a critical process "carrier."

Performance and Advantages

1. High Airtightness

• The micropore size is only 1–5 μm, resulting in high gas flow resistance and no through-leakage under a 10 bar pressure differential.

• The adsorption value of 35–40 bar provides design headroom, preventing wafer detachment or micro-shift even when the vacuum source fluctuates.

• No rubber sealing ring, so there is no chronic air leakage caused by aging, hardening, or particle shedding.

2. Corrosion and Wear Resistance

• Chemically inert ceramic, with long-term resistance to acids, alkalis, cutting fluids, grinding fluids, and deionized-water rinsing.

• SiC offers a Vickers hardness of HV 2100 and HRA 94; the pore size of the adsorption surface does not enlarge under abrasive flushing.

• No metal-ion leaching, and no contamination or metal migration with the wafer.

3. Insulating / Anti-Static

• Al₂O₃ has a volume resistivity of >1×10¹⁰ Ω·cm, a breakdown strength of 13–30 kV/mm, and a dielectric constant of 9.5.

• The SiC version has a resistivity of 1×10⁵–1×10⁸ Ω·cm (anti-static grade); the surface does not accumulate static electricity and does not attract particles.

• No exposed metal on the adsorption surface, making it suitable for electrically sensitive stations such as inspection, probing, and plasma processing.

4. High Machining Accuracy

• Flatness: 0.001–0.0015 mm for ceramic bases; 0.005–0.009 mm for stainless steel bases.

• Parallelism: 0.003–0.005 mm (ceramic) / 0.013–0.015 mm (stainless steel).

• Thickness tolerance of ±0.01 mm; the adsorption surface can be polished, and edges can be chamfered or provided with positioning notches.

Porous Performance Parameters

Product Precision

Applications

From dicing to back grinding, from silicon wafers to compound semiconductors—wherever a workpiece needs to "lie perfectly flat without scratches or dropping," that is the station for a porous chuck.

Wafer Dicing: Full-surface adsorption after film mounting ensures the dicing streets do not shift or chip; the groove-free structure prevents dicing debris from accumulating in grooves.

Back Grinding: Uniform adsorption force on thin wafers provides better control of TTV and warpage after grinding; the rigid ceramic base does not deform under grinding pressure.

Lapping & Polishing: Resistant to grinding-fluid flushing, with long-term stability of the adsorption-surface pore size; no particle shedding and no large-particle scratches introduced.

Cleaning / Inspection / Handling: Resistant to acids, alkalis, and deionized-water rinsing; the insulating version can be used for electrical testing, probe stations, and metrology stations.

Compound Semiconductors / LED / MEMS: Hard and brittle materials such as SiC, GaN, and sapphire are handled with SiC porous chucks; the anti-static grade suppresses particle adsorption.

General Precision Adsorption: Trace-free fixing of thin workpieces such as optical lenses, glass substrates, ceramic substrates, and packaging carriers.

Typical Models

Characteristics of Pan-Semiconductor Materials

Integrated circuits, discrete devices, LEDs, compound semiconductors, displays, and photovoltaics are collectively referred to as "pan-semiconductors." Their requirements for fixture materials go beyond mere "hardness": dimensional stability—no warping under heat or stress; low leaching—no introduction of metal ions or particles; corrosion and plasma resistance—withstanding acids, alkalis, grinding fluids, and etching atmospheres; and electrically controllable properties—insulating where insulation is required and dissipating static electricity where dissipation is required.

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Material Property Comparison

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Q&A

Q: Porous ceramic is "air-permeable"—will it leak air and fail to hold the wafer?

A: Quite the opposite. Porous ceramics rely on bulk adsorption: the micropores are interconnected inside the material, but with a pore size of only 1–5 μm, the flow resistance to gas is extremely high. Every point on the adsorption surface acts as a suction port, and the vacuum is transmitted from the bottom surface across the entire surface, delivering far better uniformity than grooved chucks.

Q: How do I choose between a stainless steel base and a ceramic base?

A: The base depends on precision requirements: the stainless steel base offers high strength, impact resistance, and low cost, with a flatness of 0.005–0.009 mm, making it suitable for dicing, cleaning, and handling of conventional silicon wafers; the ceramic base provides a flatness of 0.001–0.0015 mm and parallelism of 0.003–0.005 mm, with high rigidity, low thermal expansion, and insulating, corrosion-resistant properties, making it suitable for thin wafers, back grinding, lapping, and high-precision metrology stations.

Q: Can sizes and adsorption areas be customized?

A: Yes. Standard specifications cover 4 / 6 / 8 / 12 inches, and custom parts can be made to drawings in sizes from φ200 to φ330, as well as square, holed, grooved, or notched irregular shapes; the adsorption area can be divided into independent vacuum zones (separate control of inner and outer rings), and pore size, porosity, base material, and thickness can all be specified. The typical customization lead time is 3–4 weeks.