Influence of White Fused Alumina Grain Size on Sandblasting Effect of Semiconductor Quartz Products
1. Coarse Grain Size (White Fused Alumina F60/F80/F100)
Excessively high surface roughness
Large alumina grains deliver strong impact force, forming deep pits and rough textures on quartz surfaces with excessive Ra value. This weakens adhesion of subsequent coating and film layers, leading to easy peeling and shedding.
Prone to quartz microcracks
Powerful impact of coarse grains easily causes invisible microcracks on thin-walled quartz rings, flanges and nozzles, which will crack and be scrapped directly under high-temperature working conditions in semiconductor production.
Difficult removal of residual dust
Coarse sand produces large quartz debris and abrasive residues that lodge in gaps. They cannot be thoroughly cleaned by pure water ultrasonic cleaning, resulting in metallic impurity contamination during wafer manufacturing.
Severe damage to surface crystal layer
Excessive stripping of dense surface layer accelerates devitrification, whitening and opacity, greatly shortening the service life of quartz components.
Poor appearance quality
Uneven rough sandblasted surface fails to meet appearance and high cleanliness standards for high-end precision semiconductor quartz parts.
2. Medium Grain Size (Industry Standard F150/F180/F220)
Uniform and controllable roughness
It forms fine matte surface with Ra value ranging from 0.8μm to 2.5μm, perfectly matching coating, bonding and sealing processes with stable bonding strength.
Ideal removal of oxide layer and thermal damage layer
It accurately removes deteriorated layers generated by welding and high-temperature firing without damaging quartz substrate and causing hidden cracks.
Easy dust removal
Fine and loose debris can be completely eliminated via ultrasonic cleaning with high-purity water, fully satisfying ultra-high cleanliness requirements of semiconductor industry.
Minimum internal stress
Gentle and even impact ensures highly consistent sandblasting effect on bulk products and maximizes qualified rate.
Optimal choice for renovation & reuse
This grain size is preferred for reconditioning used semiconductor quartz parts with excellent repair effect and low material loss.
3. Fine Grain Size (White Fused Alumina F280/F320 & W-series Micropowder)
Weak impurity removal capacity
Insufficient cutting force fails to clear stubborn oxide scales, dark stains and sintered marks, resulting in extremely low working efficiency.
Over-smooth surface
Insufficient roughness cannot form effective bonding surface, causing easy delamination of adhesive and spray coatings.
Doubled sandblasting time
Slower processing speed for the same area reduces production efficiency and increases manufacturing cost.
Easy agglomeration of abrasives
Superfine white fused alumina tends to absorb moisture and cake, leading to uneven sand output, unprocessed areas and uneven color difference on workpieces.
Only applicable for mirror finishing
It is only used for slight matting treatment before quartz polishing, not for main surface sandblasting.
4. Common Quality Defects Caused by Mixed & Improper Grain Size
- Chaotic surface texture, obvious light and shade color difference and inconsistent appearance of batch products
- Local cracking caused by coarse grains and incomplete cleaning by fine grains lead to sharp rise of defective rate
- Excessive residual impurities enter semiconductor workshops, triggering wafer contamination and production failures
- Greatly reduced high temperature resistance and thermal shock resistance of quartz products
5. Grain Size Selection Table for Semiconductor Quartz Products
| Quartz Products | Recommended White Fused Alumina Grain Size | Quality Control Purpose |
|---|---|---|
| Thick-walled quartz crucibles & large bases | F120-F150 | Fast dirt removal without cracking |
| Quartz rings, flanges & wafer carriers | F180-F220 | Fine matte finish, clean and crack-free |
| Quartz windows & optical quartz components | F220-F280 | Gentle sandblasting while maintaining light transmittance |
| Renovation of used quartz parts | F150-F180 | Mild repair to extend service life |
6. Core Conclusion
Neither too coarse nor too fine grain size is suitable for semiconductor quartz sandblasting. High-purity white fused alumina of F180-F220 is the optimal balance point.
It can thoroughly eliminate surface impurities and damages, strictly control surface roughness, avoid microcracks and comply with high cleanliness standards of semiconductor industry. It is the best grain size to guarantee long service life of quartz products and safe chip production.