Overview
Sintered copper powder sheets are engineered materials created by compacting and heating copper powder below its melting point, forming a cohesive porous structure. This powder metallurgy process allows precise control over porosity (typically 10-90%), pore size distribution, and mechanical strength. Primarily used in industrial applications, these sheets combine the intrinsic properties of copper – excellent thermal and electrical conductivity – with the unique advantages of porous materials, such as high surface area and permeability. They serve as critical components in sectors ranging from electronics to chemical processing.
Physical and Chemical Properties
The material retains copper's native properties: thermal conductivity of 385 W/(m·K) and electrical conductivity of 58 MS/m at 20°C. Porosity reduces these values proportionally but enhances fluid/gas permeability. Typical sheets exhibit tensile strengths of 20-150 MPa depending on density. Chemically, sintered copper oxidizes slowly in air but resists many organic solvents. It dissolves readily in oxidizing acids like nitric acid. The open-pore structure increases reactivity compared to solid copper, requiring protective storage under argon or nitrogen for long-term use in sensitive applications.
Main Applications
In electronics, these sheets function as heat spreaders in high-power devices and porous electrodes for batteries/fuel cells. Their thermal management capabilities make them ideal for compact heat exchangers in aerospace and automotive systems. The filtration industry utilizes graded porosity sheets (10-50μm pores) for gas/liquid filtration in harsh environments. Emerging uses include antimicrobial surfaces in medical equipment and catalytic substrates in chemical reactors, capitalizing on copper's biocidal and catalytic properties.
Safety and Storage
Copper dust from machining requires NIOSH-approved particulate respirators (P100 filters) and local exhaust ventilation. Fine powders are combustible; store away from oxidizers in grounded containers to prevent static discharge. For maximum shelf life, vacuum-seal sheets with desiccant or store in inert gas. Oxidized surfaces can be restored via hydrogen reduction annealing at 300-500°C. Always specify RoHS/REACH compliance for EU-bound shipments due to copper's regulated status.
B2B Procurement Guide
Key specifications include: porosity (vol%), pore size distribution (ASTM F316), thickness tolerance (±0.05mm), and copper purity (C10100/C10200 grades). For thermal applications, request in-plane vs through-plane conductivity data. Bulk orders (100+ kg) typically secure 15-30% discounts. Lead times vary from 2 weeks for standard grades to 8 weeks for custom pore architectures. Quality certifications to verify: ISO 9001, MIL-DTL-12266 for military-grade materials.
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