Quartz Crucible Material (QCM-15)

Description

1. Product Overview

The Quartz Crucible Material (QCM-15) is a high-purity, engineered fused silica feedstock specifically formulated for the precision manufacturing of large-diameter quartz crucibles used in monocrystalline silicon pulling (Czochralski process). Its primary industrial application lies in photovoltaic (PV) and semiconductor wafer production, where crucible purity directly dictates ingot yield and electrical performance. The key value proposition of QCM-15 is its exceptionally low aluminum and alkali metal content, which minimizes devitrification and extends crucible service life under extreme thermal stress. Strategically, as the global push for higher-efficiency solar cells and advanced logic chips intensifies, QCM-15 enables crucible makers to reduce downtime and contamination risk—directly improving cost-per-wafer economics.

2. Key Specifications & Technical Characteristics

• Chemical Composition: High-purity synthetic fused silica (SiO₂ > 99.998%)

• Purity Level: Total metallic impurities (Al, Ca, Fe, Na, K, Li, Ti) < 15 ppm; individual alkali metals (Na, K, Li) each < 0.5 ppm

• Physical Characteristics:

  • Form: Granular, angular to sub-angular particulates

  • Color: Translucent white to off-white

  • Particle size distribution: 0.2 mm – 3.5 mm (custom cuts available upon request)

  • Bulk density: 1.25 – 1.35 g/cm³

  • Coefficient of thermal expansion (20–1000°C): 0.55 x 10⁻⁶ /K

• Packaging Options: 25 kg moisture-barrier inner liner + woven outer bag; 1 MT big bags; 20 MT sealed bulk bags on pallets

• Shelf Life: 24 months from date of manufacture when stored in dry (<50% RH), ambient temperature conditions (5–35°C) in unopened, sealed packaging

3. Core Industrial Applications

• Primary industries: Photovoltaic (monocrystalline PERC, TOPCon, HJT cells); Semiconductor (200 mm & 300 mm wafer foundries); Specialty optical glass

• Specific operational use cases:

  • Arc-fusion crucible forming for 28”–40” diameter crucibles used in CZ pullers

  • Re-crystallization barrier layer in double-layer crucibles to prevent bubble formation

  • High-temperature containment for polysilicon remelting (up to 1500°C)

• Why QCM-15 performs better: Unlike conventional crucible sands with higher sodium content (which triggers early devitrification), QCM-15’s ultralow alkali profile delays cristobalite formation by >30%. This yields 15–20% more pulling cycles per crucible and reduces bubble-induced dislocation defects by over 40% compared to standard quartz feedstocks.

• Efficiency/cost advantage: Crucible manufacturers report 18% lower scrap rates during arc-fusion forming and a 12% reduction in post-casting surface grinding due to superior particle flow uniformity.

4. Competitive Advantages

• Quality consistency: Statistical process control with lot-to-lot impurity variation < ±2 ppm; each batch certified via ICP-MS and XRF. ISO 9001:2024 certified facility.

• Supply reliability: Vertically integrated mining-to-processing; dual-continent production (Asia + Europe) ensuring <10-day lead time for emergency replenishment.

• Logistics capability: Dedicated hazardous-free, moisture-controlled container fleet; real-time GPS tracking for all B2B orders.

• Price competitiveness: 8–12% lower total landed cost than European or Japanese equivalents for bulk contract volumes (20 MT+), achieved via optimized sea-freight consolidation and port-side warehousing.

• Sustainability: 100% recycled process water; zero heavy-metal discharge; compliant with EU Conflict-Free Minerals Regulation and RoHS.

• Technical support: Full crucible formation simulation service (Arc-FEM analysis) and on-site material qualification assistance provided by application engineers.

5. Commercial & Supply Information

• Minimum Order Quantity (MOQ): BULK 20 MT (twenty metric tons) per order line

• Loading capacity: 20 MT per standard 20-foot dry container (floor-loaded or big bags); 26 MT per 40-foot high-cube container when palletized