Fastick™ System with SiC Grinding

Importance of the Topic

The preparation of metallographic samples through grinding and polishing is a foundational step in materials analysis and quality control. Achieving a planar, damage-free surface is essential for accurate microstructural examination, phase identification, and quantitative measurements. Traditional magnetic disc systems are common but can be associated with high operating costs, risk of cross-contamination from metallic debris, and complexity in disc handling. The Fastick system addresses these challenges by introducing a pressure-sensitive adhesive (PSA) base disc and an easily applied consumable polishing cloth or silicon carbide (SiC) grinding disc, offering streamlined workflow and reduced contamination.

Study Objectives and Overview

This application note by LECO Corporation aims to demonstrate the design, operation, and performance of the Fastick system for grinding and polishing of metallographic specimens, with a focus on aluminum samples. The objectives are to compare the ease of use, contamination control, and cost-effectiveness relative to magnetic disc assemblies, and to provide a detailed protocol for typical sample preparation.

Applied Methodology and Instrumentation

Methodology

• Adhesive base disc: A PSA-backed disc adheres to the polisher and serves as a reusable platform for consumables.
• Consumables: Fastick polishing cloths with proprietary backing and plain-backed SiC abrasive papers.
• Procedure: Sequential grinding steps using 240, 400, 600, and 800 grit plain-back SiC papers, followed by polishing with 3 µm diamond cloth, 1 µm diamond cloth, and 0.05 µm colloidal silica cloth.

Instrumentation

• Rotary grinder/polisher equipped with 8", 10", or 12" wheels.
• Fastick Base discs and corresponding consumables (Mix, Red, Opto, Yellow Cameo, and Step types).

Main Results and Discussion

The Fastick system demonstrated consistent adhesion of consumable discs and cloths without the need for magnetic retention rings. Removal of spent abrasives was straightforward, minimizing downtime between steps. The absence of metal attraction by magnetic components reduced cross-contamination risk. Aluminum samples processed according to the provided protocol achieved planar, scratch-free surfaces suitable for high-resolution microscopy. The system maintained uniform pressure distribution, yielding reproducible sample preparation across multiple sizes of polishing wheels.

Benefits and Practical Applications

• Cost-effectiveness: Eliminates the expense of magnetic discs and retaining rings.
• Contamination control: Reduces metal debris adhesion to polishing cloths.
• Ease of use: Quick attachment and removal of consumables accelerates workflow.
• Versatility: Compatible with a range of abrasive grits and polishing media.

Future Trends and Opportunities

The Fastick approach may be extended to other adhesive-backed abrasives and emerging polishing techniques, such as automated sample handling and real-time surface monitoring. Integration with vibration-assisted polishing or novel nanodiamond suspensions could further enhance finish quality. There is potential for customized base disc designs tailored to specific geometries or high-throughput laboratory settings.

Conclusion

The Fastick system offers a streamlined, cost-saving alternative to traditional magnetic disc methods for metallographic sample preparation. By leveraging PSA technology, it improves contamination control and operational efficiency while delivering high-quality surfaces for analytical needs.

Reference

No references were provided in the original application note.