Cutting 6mm glazed porcelain with a 105 disc and pulling out a 0.5mm flaw along the edge is rarely about operator technique — it usually points to the wrong metal powder or pre-alloyed powder in the matrix.
The φ105 format is the highest-volume dry-cutting disc on construction sites. Segments stand about 10mm tall and take on tile, glazed porcelain, glazed brick and sintered stone. Users ask for three things: quick entry, no dragging on sustained dry cutting and edges that stay intact. What decides all three is what happens after sintering.
Real sharpness comes from matching the wear rate
Diamond particles are not sharp as supplied. A cutting edge only appears as particles wear down and fresh ones surface from the matrix. If the matrix is consumed too fast, particles fall out before contributing anything and blade life collapses. If it is consumed too slowly, dulled grains stay gripped, the cut drags and speed never builds.
So the criterion is not hardness. It is whether the self-sharpening rate matches how fast the workpiece abrades.
Charging iron, copper and tin in correct ratios only makes them neighbours. Because the densities differ sharply, vibration during die filling lets coarse and fine particles re-stratify. After sintering the matrix is uneven and local diamond retention swings between too weak and too strong, so blade life within one batch scatters.
Pre-alloyed powder finishes alloying inside a single particle at the powder stage, giving a multi-metal eutectic below the melting point of any constituent. Industry data indicates this lowers sintering temperature by roughly 60–100°C against conventional blended powders, so liquid phase appears earlier and densification improves.
Switch systems by workpiece, then validate on samples
For ordinary tile and glazed porcelain, Fe-Cu-Sn is the most economical route: uniform Cu-Sn liquid phase, solid self-sharpening, no cobalt or nickel. For high-density porcelain, sintered stone or tighter edge-breakage targets, move up to Fe-Cu-Co-Sn, where cobalt bonds metallurgically to diamond. Where the workpiece is brittle, a moderately brittle Fe-Cu-Sn grade often cuts sharper in practice.
The sequence is straightforward: fix the condition (dry / wet / slotting), screen grades by particle size and hardness, then verify batch consistency on trial samples. Selection is not about finding the best powder, but the powder that fits your cutting condition and sintering process. Sagwell works in superfine metal powder and pre-alloyed powder systems for diamond tools, supporting dry-cut ceramic, glass and sintered stone with sample validation and formulation tuning.
Please feel free to consult for more details.
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