Reasons of Green Silicon Carbide (GC) Micropowder for Grinding Brittle-Hard Glass
Brittle-hard glass—characterized by high hardness and low fracture toughness—is highly prone to edge chipping and the formation of micro-cracks during grinding. This category includes fused silica/quartz glass, high-borosilicate glass, optical glass, aluminosilicate glass, glass-ceramics, and alkali-free aluminoborosilicate glass.
1. Excellent Self-Sharpening and Stable Cutting Performance
Green silicon carbide (GC) possesses an optimal level of brittleness; under grinding pressure, the abrasive grains continuously fracture to reveal new, sharp cutting edges, preventing the material from becoming dull or slipping. Given the inherent difficulty in machining brittle-hard glass, GC offers higher material removal rates compared to white fused alumina (white corundum) of the same grit size, effectively avoiding the “polishing/slipping” phenomenon where the abrasive merely rubs against the surface without cutting.
2. Hardness Well-Suited for Brittle-Hard Glass
With a Vickers hardness (HV) of approximately 2800–3300, green silicon carbide (GC) is significantly harder than various types of optical, quartz, and borosilicate glasses, ensuring robust cutting capability. At the same time, its cutting force is not as aggressive as that of diamond, making it easier to control the risk of edge chipping or fracturing—ideal for precision lapping.
3. High Thermal Conductivity and Low Thermal Expansion, Reducing Thermal Chipping
Brittle-hard glass is highly sensitive to thermal stress; localized high temperatures can easily lead to micro-cracks, corner chipping, or warping. Green silicon carbide (GC) features high thermal conductivity and a low coefficient of thermal expansion, which facilitates heat dissipation during grinding, keeps the workpiece temperature low, and effectively minimizes thermal damage.
4. High Chemical Stability, Minimizing Surface Contamination
Green silicon carbide (GC) is resistant to water, weak acids, and weak bases. It does not readily leach metallic impurities into water-based grinding slurries, nor does it tend to cause staining or leave ionic residues on the glass surface—making it well-suited for the initial grinding stages of optical-grade glass.
5. The particle morphology of Green Silicon Carbide (GC) is well-suited for free-abrasive lapping, ensuring uniform material removal even on grooved or complex-shaped surfaces.
With their multi-angular shape, Green Silicon Carbide (GC) particles exhibit excellent suspension properties in slurries, allowing them to penetrate complex structures—such as grooves and V-shaped channels—to deliver consistent lapping results. The particle size distribution can be controlled to be ultra-fine and narrow, striking an optimal balance between material removal rate and surface roughness.
In summary, Green Silicon Carbide GC micropowder features high self-sharpening capability, superior thermal conductivity, and excellent chemical stability. It offers high lapping and cutting efficiency while effectively minimizing edge chipping and thermal deformation in V-shaped grooves, making it an ideal choice for the precision lapping of hard, brittle glass.