Overview
Silver palladium paste is a specialized conductive material combining silver (Ag) and palladium (Pd) particles dispersed in an organic binder. It is primarily used in electronics for its balanced cost-performance ratio, offering better oxidation resistance than pure silver pastes while remaining more affordable than high-palladium alternatives. The paste is applied via screen printing or dispensing, followed by a sintering process to form conductive paths. Its formulation can be adjusted for specific resistivity, adhesion strength, or thermal expansion coefficients, making it versatile for diverse electronic components.
Physical and Chemical Properties
The paste typically contains 60-90% metal content by weight, with Ag:Pd ratios ranging from 70:30 to 90:10. Particle sizes are finely controlled (0.5-5 µm) to ensure smooth printing and dense sintering. After curing, it forms a conductive layer with resistivity of 5-20 µΩ·cm. Thermal stability is a key advantage, withstanding temperatures up to 850°C in MLCC applications. The organic vehicle (often ethyl cellulose or acrylic resins) evaporates cleanly during sintering, leaving minimal residues. Compatibility with alumina, glass, and ceramic substrates is ensured through tailored rheology.
Main Applications
In thick-film hybrid circuits, Ag-Pd paste creates interconnects and resistors on ceramic substrates. For MLCCs, it serves as internal electrodes due to its co-firing compatibility with barium titanate dielectrics. Automotive sensors rely on its durability under harsh conditions. The biomedical field uses it for implantable electrodes, leveraging palladium's biocompatibility. Emerging applications include printed flexible electronics and photovoltaic cells, where its fine-line printing capability (<50 µm width) is critical. Each use case requires optimization of the paste's rheology and sintering profile.
Safety and Storage
The paste contains volatile organic compounds (VOCs) from solvents like terpineol. Work areas should have local exhaust ventilation, and PPE (nitrile gloves, goggles) is mandatory. Spills must be cleaned with absorbents, not water. Unopened containers have a 6-12 month shelf life if stored properly. Freezing or prolonged exposure to humidity causes particle agglomeration. Before use, pastes beyond 3 months should be re-homogenized via triple-roll milling to restore printability.
B2B Procurement Guide
Specify metal ratio (e.g., 85Ag/15Pd), viscosity (typically 30-150 Pa·s at 10 rpm), and recommended sintering profile (e.g., 850°C peak for 10 minutes). For high-frequency applications, request low dielectric loss formulations. Bulk orders (25+ kg) often qualify for 15-20% discounts. Audit suppliers for ISO 9001 certification and batch-to-batch consistency testing. Sample evaluation should include adhesion tests (peel strength >1.5 N/mm) and resistivity measurements after thermal aging.
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