Overview

An etched nickel shim is made by photochemical machining that forms precision shims, mask plates and micro-gap spacers from ultra-thin nickel foil without mechanical force or a stamping die. The outline, micro-holes and fine slits are imaged onto a photoresist mask, developed, and the unprotected metal is dissolved in a nickel-matched chemistry, so thickness, hole diameter and line width are set by the artwork and etch dwell rather than by tool pressure. Standard substrates are Ni200/Ni201 pure nickel and nickel-iron alloy down to 0.01 mm. Because removal is chemical, the shim leaves the line ultra-flat, burr-free and clean.

For microelectronics and precision-assembly engineers, the etched nickel shim solves three recurring problems. Shims thin to the 0.01 mm class while carrying 0.08 mm micro-holes, which stamping curls and tears while wearing dies quickly; masks, encoder discs and magnetic-head assemblies need ultra-flat, micron-graded, particle-free shims that punching and laser cannot combine with clean edges, and laser heat discolors the foil; and nickel foil is soft, so mechanical work adds stress and creases. Chemical machining forms every shim on a panel at the same rate, holding thickness and outline consistent from the first sample through volume production, while keeping nickel's corrosion and magnetic stability.

Parameter Window

• Available Materials: Ni200/Ni201 pure nickel, nickel-iron alloy; also 316L stainless for mixed builds
• Material Thickness Range: 0.01–0.5 mm (common 0.02 / 0.05 / 0.1 mm)
• Tolerance: ±0.003 mm on thickness, ±0.015 mm on outline, ±0.015 mm on hole position
• Minimum Feature: 0.08 mm hole diameter, 0.10 mm line width
• Surface Options: electropolishing, passivation, ultrasonic cleaning, vacuum clean packaging
• Compliance: ISO 9001 process control, RoHS/REACH material traceability

Manufacturing Process / Workflow (8 Steps)

1. Artwork & Nesting — Vectorize the outline, micro-holes and fine slits, verify hole-to-thickness ratio, and plan panel layout with registration marks.
2. Material Certification & Prep — Confirm Ni200/Ni201 grade, mill certificate and thickness, inspect foil flatness and surface, then shear to exposure size.
3. Cleaning & Lamination — Degrease and laminate dry-film resist on a carrier under matched heat and pressure so ultra-thin foil has no bubbles or wrinkles.
4. UV Exposure — Expose through high-resolution film with the array registered to the sheet edge for panel-level hole consistency.
5. Development — Wash out unexposed resist to open the cut areas, and inspect for residue that would block etching.
6. Controlled Etching — Spray nickel-matched chemistry, tuning time, temperature and conveyor speed to hold walls without widening fine slits.
7. Stripping & Finishing — Remove resist, neutralize, then electropolish and passivate to clear micro-burrs and restore a clean, flat foil.
8. Inspection & Packaging — Measure thickness, hole diameter and outline on a vision system, verify flatness, then vacuum-pack in clean trays.

Core Advantages

1. Ultra-thin thickness control: Foil down to 0.01 mm can be graded in microns, meeting the smallest gap settings in microelectronics and mask work.
2. No die cost: Each new outline is a new film, keeping prototypes and frequent revisions economical without a stamping tool.
3. Clean micro-hole edges: 0.08 mm holes and 0.10 mm slits form together across a panel with burr-free edges that shed no particles.
4. Ultra-flat and stress-free: With no shear or heat input, ultra-thin foil stays flat, so stacking or bonding to a mask does not warp or crease it.
5. Stable corrosion behavior: Pure nickel resists alkalis, mild acids and vacuum, holding thickness and gap settings through cleaning and thermal cycling.
6. Fast custom turnaround: the etched nickel shim moves from drawing to sample quickly, with thickness, hole size and outline tuned item by item for non-standard masks.

Typical Applications

• Precision shadow masks: Deposition, sputtering and fine-pattern transfer masks that must be ultra-flat with clean aperture edges.
• Encoder disc shims: Micro-gap spacers between optical encoder discs and read heads where thickness accuracy is critical.
• Magnetic-head spacers: Micron-level gap shims in magnetic-recording head assemblies with stable magnetic and dimensional behavior.
• Fuel-cell flow-field shims: Thin spacers between bipolar plates and membrane-electrode assemblies that are corrosion-resistant and flat.
• Microelectronic adjusters: Ultra-thin alignment and compensation shims in micro-assembly and packaging equipment that stay clean and stress-free.
• Vacuum coating fixtures: Thin spacers between fixtures and substrates inside vacuum chambers that resist vacuum and shed no particles.

Design Notes & Process Considerations

1. Hole-to-thickness ratio: Keep hole and line width at or above material thickness; very fine features in foil distort from undercut and widen the slit.
2. Thickness and cleanliness callout: State nominal thickness, tolerance and particle-cleanliness level, not only a target gap, and grade-mark mask-duty parts.
3. Grade and temper: Choose Ni200/Ni201 for ductility or nickel-iron for thermal expansion, and note temper, certificate and flatness needs.
4. Nesting and tie bars: Leave enough tie bars and process borders, and specify the final cut method so ultra-thin shims survive stripping and cleaning.
5. Ultra-thin foil handling: For foil below 0.05 mm, specify a carrier, liner and vacuum packaging, and call out cleanliness to avoid creases and particles.
6. Surface and tolerance: With an etched nickel shim, define electropolishing, key hole tolerances and cleaning limits, especially for mask-grade parts.