1100 aluminum pcb drill entry sheet is a common aluminum alloy material, commonly used in the manufacture of aluminum backing plates for PCBs (printed circuit boards), particularly in applications requiring excellent thermal conductivity and lightweight construction. 1100 aluminum alloy offers excellent corrosion resistance, good formability, and electrical conductivity, making it suitable for heat dissipation in electronic components.
- Material Performance Advantages
1100 aluminum pcb drilling entry sheet are industrially pure aluminum (aluminum content ≥99.00%) and possess the following core properties:
– Thermal Conductivity: Thermal conductivity reaches 220W/(m·K), over 10 times that of FR-4 substrates, rapidly dissipating heat generated by drill friction (reducing drill bit temperature by approximately 30%).
– Hardness and Machinability: With a Brinell hardness of 20HB and a tensile strength of 110-136MPa, the low hardness reduces drill bit wear (extending drill bit life by 20%) and facilitates precision machining.
– Surface Quality: Surface roughness Ra ≤ 0.28μm (horizontally), flatness requirement ≤ 3mm/m, ensuring drilling positioning accuracy (hole position deviation ≤ ±0.05mm).
- Standard Specifications and Applications
Thickness Range: Commonly used 0.15-0.20mm (H18 state), customizable 0.06-0.30mm.
Dimensional Accuracy: Width tolerance ±0.5mm, length tolerance ±1.0mm, coil stagger ≤ 2mm, tower shape ≤ 5mm.
Industry Certification: Complies with T/HNNMIA1-2018 “Aluminum Alloy Sheet for Printed Circuit Board Drilling Cover Sheets” standard and has passed SGS environmental certification.
- Surface Treatment Technology
– Anodizing: Oxide film thickness of 5-20μm, corrosion resistance increased fivefold, and surface hardness reaches HV150. However, roughness Ra ≤ 0.28μm must be maintained to avoid compromising drilling quality.
– Passivation Treatment: A Na₂CO₃-K₂CrO₄ system is used for passivation, forming a 0.5-1μm passivation film for enhanced corrosion resistance (no corrosion after salt spray testing for ≥ 24 hours).
- Drilling Layered Stacking Process
A three-layer stacking system consisting of a phenolic backing plate (0.3-0.5mm) + aluminum base plate + 1100 aluminum drill entry sheet (0.15-0.20mm) is used to achieve the following:
– Heat Dissipation and Chip Cleaning: The aluminum pcb drill entry sheet quickly conducts heat, and the aluminum wire automatically clears debris from the hole during tool retraction, ensuring burr height ≤ 0.03mm.
– Guiding Positioning: The aluminum and phenolic pcb drill entry sheets work together to minimize drilling deviation (positioning accuracy improved to ±0.02mm).
– Surface Protection: The drill bit is protected from direct contact with the aluminum base plate to prevent indentations and scratches.
- 5.Application Areas
– LED Lighting: 1100 aluminum pcb drill entry sheets are commonly used in LED lamps, improving heat dissipation efficiency and ensuring LED stability and lifespan.
– Power Electronics: In power modules and power amplifiers, aluminum pcb drill entry sheets effectively dissipate heat, improving overall performance.
– Automotive Electronics: In automotive electronics, 1100 aluminum pcb drill entry sheets provide excellent heat dissipation and electrical performance, ensuring reliability in high-temperature environments.
In summary, 1100 aluminum pcb drill entry sheets are widely used in modern electronic devices due to their excellent thermal conductivity, lightweight design, and excellent processability, particularly in applications requiring efficient heat dissipation.