Silicon carbide (SiC) whiskers

Description

1. Product Overview
Silicon carbide (SiC) whiskers are high-aspect-ratio, single-crystal ceramic reinforcements engineered for extreme-performance composites. Primary industrial use lies in aerospace armor, cutting tool inserts, and high-temperature structural ceramics, where they impart unmatched fracture toughness and thermal stability. The key value proposition is a 300–400% increase in material strength and wear resistance over conventional ceramics. Strategically, SiC whiskers are critical for manufacturers transitioning to lightweight, durable systems that reduce lifecycle costs and enable next-generation propulsion and ballistic protection.

2. Key Specifications & Technical Characteristics

• Chemical composition: β-SiC (cubic polytype) with trace sintering aids ≤0.5%

• Purity level: ≥98.5% (standard grade); ≥99.9% (high-purity electronics grade)

• Physical form: Acicular (needle-like) monocrystalline whiskers

• Color: Light gray to dark green

• Typical diameter: 0.5 – 2.0 µm

• Typical length: 10 – 80 µm

• Aspect ratio (L/D): 20:1 to 60:1 (user-specifiable)

• Density: 3.21 g/cm³

• Melting point (decomposition): ~2,730°C

• Packaging options: 1 kg, 5 kg, 10 kg vacuum-sealed aluminum-lined bags; 25 kg fiber drums with desiccant; bulk super sacks (500 kg)

• Shelf life: 24 months in unopened, dry, inert atmosphere (RH <40%, T <35°C)

3. Core Industrial Applications

• Aerospace & defense: Ceramic matrix composites (CMCs) for turbine engine shrouds, nozzle flaps, and lightweight vehicle armor panels. SiC whiskers outperform continuous fibers in complex-shaped components and offer 2x higher interlaminar shear strength than SiC particle reinforcements.

• Metalworking & machining: High-speed cutting tool inserts (Al₂O₃/SiCw ceramics). Achieves 3–5x longer tool life compared to carbide tools on Inconel, hardened steel, and cast iron; maintains hardness >20 GPa at 1,000°C.

• Electronics thermal management: Reinforced aluminum (Al/SiCw) heat spreaders for IGBT modules and 5G base stations. Thermal conductivity exceeds 200 W/m·K while matching silicon’s CTE (4–6 ppm/K), eliminating solder fatigue.

• Wear components: Mechanical seals, slurry pump liners, and extrusion dies. Reduces friction coefficient to 0.2–0.3 against steel, cutting maintenance intervals by 60%.

4. Competitive Advantages

• Quality consistency: Each batch undergoes SEM aspect-ratio verification, XRD phase analysis, and ICP-OES purity validation; COA provided with every shipment.

• Supply reliability: Dual-source production lines (China + Southeast Asia) with 200+ MT annual capacity; buffer stock maintained at three regional hubs.

• Logistics capability: EXW, FOB, CIF, and DDP terms available; express air (1–2 weeks) or sea freight (20–35 days) with hazardous material (Class 9, UN 3089) certified packaging.

• Price competitiveness: 12–18% below European and U.S. equivalents at equivalent purity and aspect ratio distribution.

• Sustainability: Production uses closed-loop acid washing (zero liquid discharge); whiskers are recyclable within CMC scrap streams.

• Technical support: Full dispersion protocols (sonication, pH adjustment for aqueous slurries), safety handling guides (respiratory protection mandatory), and formulation consulting included.

5. Commercial & Supply Information

• Minimum order quantity (MOQ): 20 MT (bulk industrial grade); high-purity grade: 5 MT

• Loading capacity: 20 MT per 20-ft standard container (palletized, 1,000 kg net per pallet, 20 pallets per container)

• Lead time: 14 days for sample quantities (≤50 kg); 30–45 days for MOQ bulk orders

• Payment terms: Letter of credit (L/C at sight) or 30% TT advance + 70% against copy of bill of lading