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Designed as an eco-friendly alternative to silver cadmium oxide (AgCdO), AgCuO contact chips deliver high electrical reliability across demanding switching applications. Manufactured through powder metallurgy and internal oxidation processes, these components feature fine copper oxide particles uniformly dispersed within a pure silver matrix. This microstructure prevents contact sticking, reduces material transfer during electrical arcing, and complies fully with global RoHS and REACH environmental regulations.

Formulations & Material Grades

AgCuO8 (8% CuO, Balance Ag): Highest electrical conductivity and lowest initial contact resistance. Best suited for continuous high-current conduction with minimal temperature rise.

AgCuO10 (10% CuO, Balance Ag): Standard balanced formulation offering high arc erosion resistance and thermal stability across medium-duty industrial switching cycles.

AgCuO12 (12% CuO, Balance Ag): Maximum resistance to contact welding and material erosion under severe switching stress and high inrush current conditions.

Key Performance Advantages

Anti-Welding Performance: Dispersed oxide phase disrupts liquid silver bridging during high-current arcing, preventing contact seizure under short-circuit conditions.

Controlled Arc Erosion: Uniform particle distribution disperses thermal stress, minimizing localized pitting and extending mechanical switching life.

Environmental Compliance: 100% cadmium-free composition satisfies worldwide environmental standards without compromising breaking capacity.

Thermal Management: Maintains low operating temperatures under rated continuous currents, protecting internal actuator springs from heat degradation.

Engineering Specifications

Parameter	AgCuO8	AgCuO10	AgCuO12	Testing Standard
CuO Content (wt%)	8.0%	10.0%	12.0%	Chemical Analysis
Density (g/cm³)	≥ 10.1	≥ 9.9	≥ 9.8	Archimedes Method
Electrical Conductivity (MS/m)	≥ 48.0	≥ 42.0	≥ 38.0	Eddy Current
Hardness (HV)	75 - 105	85 - 120	95 - 130	Micro-Vickers
Shear Strength (Bimetal Layer)	≥ 180 MPa	≥ 180 MPa	≥ 180 MPa	ASTM B565
CuO Particle Size	≤ 3 um	≤ 3 um	≤ 3 um	Metallographic
Dimensional Tolerance (L x W)	+/- 0.05 mm	+/- 0.05 mm	+/- 0.05 mm	Optical Micrometer
Thickness Tolerance	+/- 0.03 mm	+/- 0.03 mm	+/- 0.03 mm	Gauge Block

Structural Forms & Geometries

Solid Monometal Flat Chips: Length: 2.0 - 25.0 mm | Width: 2.0 - 20.0 mm | Thickness: 0.5 - 4.0 mm. Suitable for standard resistance or induction brazing onto brass and copper terminals.

Radiused Profile Top Chips: Spherical Radius: R 5.0 - R 50.0 mm. Guarantees defined contact alignment under mechanical actuation tolerances.

Bimetal Tri-Layer Chips: Top functional AgCuO layer (30%–70% thickness) bonded to a pure copper substrate layer for efficient brazing and lower precious metal content.

Industrial Applications

Molded Case Circuit Breakers (MCCB): Main contact elements rated for 63A to 800A circuit protection duties.

AC Contactors: Power switching components engineered for AC-3 and AC-4 motor switching categories.

Miniature Circuit Breakers (MCB): Arc-resistant contacts for commercial and industrial current interruption modules.

Heavy-Duty Power Relays: Control relays operating under high capacitive or inductive load switching cycles.

Customization & Secondary Processing

Layer Depth Ratios: AgCuO functional layer customizable from 0.3 mm to 2.5 mm; copper backing adjustable from 0.2 mm to 2.0 mm.

Backside Brazing Layers: Available with pure silver backing (2 - 10 um), copper backing, or pre-fluxed silver brazing alloy coatings (Ag-Cu-Zn-Sn).

Surface Locating Features: Flatness controlled within 0.015 mm; optional locating dimples, cross-grooves, or alignment tabs for automated pick-and-place positioning.

Additive Modifications: Inclusion of secondary oxides (In2O3, WO3, or Bi2O3 at 0.1%–0.5% weight) to refine arc movement and contact resistance behavior.

Quality Assurance & Verification

Microstructure Analysis: Cross-sectional metallography confirms oxide particle distribution, matrix homogeneity, and interfacial bond integrity.

Elemental & Density Verification: X-Ray Fluorescence (XRF) checks exact silver-to-copper ratios; hydro-density testing ensures compaction quality.

Mechanical Bond Testing: Micro-Vickers hardness charting and destructive shear testing guarantee bimetal layer strength.

Automated Optical Inspection (AOI): 100% vision system screening detects edge burrs (<= 0.02 mm), dimensional variances, and surface defects.

Packaging & Logistics

Vacuum Sealed Barrier Bags: Clean-room packed in vacuum-sealed polyethylene bags with desiccant to prevent atmospheric oxidation.

Tape & Reel Feed Packaging: Optional antistatic carrier tape reels compliant with high-speed automated assembly lines.

Traceability Labeling: Every package displays barcoded batch data linked to raw material heat numbers, sintering run logs, and inspection certificates.

Frequently Asked Questions

Q: How does AgCuO8 differ functionally from AgCuO12?

A: AgCuO8 features higher electrical conductivity (≥ 48 MS/m), making it ideal for low temperature-rise, continuous current applications. AgCuO12 contains more oxide content, offering maximum resistance to arc erosion and contact welding under heavy inductive load switching.

Q: Can AgCuO directly replace AgCdO in existing switch designs?

A: Yes, AgCuO serves as a direct functional alternative to AgCdO in most low-voltage switching devices. Temperature rise verification is recommended during initial prototype qualification due to slight variations in thermal dissipation characteristics.

Q: How is bimetal bonding integrity ensured?

A: Substrate layers are joined via hot co-extrusion or solid-state diffusion bonding under controlled atmospheres. Every production lot undergoes shear testing to verify interfacial bond strength above 180 MPa.

Q: What backside preparation options exist for automated brazing?

A: Chips can be supplied with pure silver backing, copper backing, or pre-applied brazing alloy layers, allowing seamless integration with resistance, induction, or furnace brazing processes.

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