Overview

Aerospace grade titanium etching for precision instruments is a photochemical machining route that shapes thin commercially pure titanium and Ti-6Al-4V sheet into diaphragms, optical slits, sensor frames and micro-grids in one chemical step rather than by stamping, laser cutting or milling. Dry-film resist is laminated to both faces, the fine artwork is exposed and developed through high-resolution film, and the unprotected titanium is dissolved in a controlled etchant, so micro-holes, narrow slits, mesh bridges and locating tabs all form together. Because removal is chemical and stress-free, parts leave the line flat and burr-free with no heat-affected zone or oxygen-embrittled alpha-case, which protects the corrosion resistance and fatigue performance that make titanium worth specifying in the first place.

For sourcing and design engineers, the precision etching process avoids three problems that make titanium hard to work conventionally: the metal's low thermal conductivity and high reactivity cause laser cutting to leave a hard, oxygen-embrittled recast layer and heat tint, its tendency to gall and work-harden makes stamping and drilling tool-wear intensive, and its springback makes thin, intricate frames difficult to hold flat by machining. Since the geometry lives in the film, a new part number is only a new artwork, and every component on a panel etches at the same rate, so slit width, hole diameter and edge quality stay consistent from the first sample to flight or medical production lots. Add the material's high specific strength, chloride and body-fluid corrosion resistance, non-magnetic character and biocompatibility, and the approach fits instruments that must be light, clean and dimensionally stable.

Parameter Window

• Available Materials: Grade 1/2 commercially pure titanium, Grade 5 Ti-6Al-4V, titanium alloy foil
• Material Thickness Range: 0.05–1.5 mm
• Tolerance: ±0.03 mm on hole and slit position, ±0.02 mm on fine features
• Minimum Feature: 0.10 mm micro-hole and 0.12 mm bridge at 0.10 mm stock; 0.15 mm slit
• Surface Options: acid pickling and passivation, anodizing, electropolishing, medical-grade cleaning, bead blast
• Compliance: ISO 9001 process control, RoHS/REACH material traceability

Manufacturing Process / Workflow (8 Steps)

1. Artwork Review — Convert 2D files to vector outlines, check micro-hole diameter, slit and bridge widths against stock thickness, and confirm tab positions.
2. Material Prep — Select Grade 1/2 or Ti-6Al-4V by strength and corrosion needs, shear annealed foil to panel size, and verify the mill certificate and surface finish.
3. Cleaning & Lamination — Degrease and lightly pickle, then hot-roll dry film onto both faces with pressure matched to film thickness so no bubbles sit under fine holes.
4. UV Exposure — Expose both sides through high-resolution film with front-to-back registration so slits and mounting holes stay concentric.
5. Development — Wash away unexposed resist to open the titanium to be removed, and inspect fine holes for residual resist under magnification.
6. Etching — Spray chemistry matched to the titanium grade; time, temperature and conveyor speed govern the precision etching process, sidewall and feature depth across the panel.
7. Stripping & Finishing — Remove resist and neutralize, then pickle, passivate or anodize and electropolish; run medical-grade cleaning where fluid contact demands it.
8. Inspection & Packaging — Verify profile, hole diameter, flatness and coating against the approved sample, then pack in clean trays with first-article measurements.

Core Advantages

1. No heat-affected zone or alpha-case: Chemical removal avoids laser heat tint and oxygen embrittlement, so fatigue strength and corrosion resistance stay intact.
2. Lightweight with high specific strength: Thin titanium parts keep stiffness at low mass, cutting inertia in gyroscopes, optical scanners and airborne instruments.
3. Corrosion and biocompatibility preserved: The passive oxide layer is untouched, so parts tolerate chlorides, sterilants and body fluid without coating or plating.
4. No tooling for intricate geometry: Micro-holes, fine slits and mesh bridges form in one pass; a new part number is just a new film, keeping low-volume runs economical.
5. Burrs and stress avoided: No roll-over, dross or machining stress is introduced, so thin diaphragms and resonant frames stay flat and dimensionally stable.
6. Non-magnetic and temperature tolerant: Titanium's non-magnetic, heat-resistant character is fully retained, suiting sensors and instruments near magnetic fields or thermal cycles.

Typical Applications

• Pressure sensor diaphragms: Thin titanium membranes with etched thinned zones that flex repeatedly without fatigue cracking.
• Mass-spectrometer and detector grids: Fine micro-hole meshes and ion optics that stay flat under vacuum and temperature drift.
• Surgical and implant micro-components: Biocompatible clips, spacers and screens that resist sterilants and body fluid.
• Optical slits and apertures: Burr-free precision slits for spectrometers, encoders and alignment instruments.
• Gyroscope and resonant frames: Light, stiff, non-magnetic structures for inertial and vibration sensing.
• Aerospace fluid and filter elements: Corrosion-resistant foils with dense hole patterns for hydraulic and fuel monitoring.

Design Notes & Process Considerations

1. Hole diameter versus thickness: Keep the smallest hole near the stock thickness, or undercut will taper the wall and weaken narrow bridges.
2. Grade selection by duty: Use Grade 1/2 for maximum formability and corrosion resistance and Ti-6Al-4V where strength and fatigue life dominate.
3. Avoid alpha-case: State that no thermal cutting is permitted, since oxygen-embrittled edges reduce fatigue performance in cyclic diaphragms.
4. Flatness and springback: Specify flatness per 100 mm for thin frames and allow a leveling step, because titanium springs back after forming.
5. Surface and cleanliness: Choose pickling, passivation, anodizing or electropolishing by the environment, and note cleanliness for medical or vacuum use.
6. Complete drawing data: State grade, temper, thickness, hole pattern, flatness and finish together; putting all six items on the print cuts back-and-forth confirmation.