Red Sapphire Crystal Workpiece – Hardness 9 Mohs, Anti-Scratching,
99.99% Purity
Red sapphire crystal workpieces represent the ultimate engineering
excellence. Crafted from 99.99% pure chromium-doped aluminum oxide
(Al₂O₃:Cr³⁺), these components combine the legendary Mohs 9 hardness (second
only to diamond) with breathtaking ruby-red coloration for
applications demanding both uncompromising durability and visual
sophistication.
Through advanced Czochralski crystal growth and diamond-tool
precision machining, we achieve:
- Atomic-level surface finishes (Ra <0.5nm)
- Near-theoretical density (3.98 g/cm³)
- Optical-grade clarity (>90% transmission in visible spectrum)
- Consistent chromaticity (CIE color coordinates x=0.680, y=0.310
±0.005)
These workpieces maintain their vibrant red hue indefinitely,
unaffected by UV exposure or thermal cycling up to 1000°C, making
them ideal for high-end watchmaking, luxury instrumentation, and
aerospace viewports.
Key Features
1. Material Superiority
- Single-crystal structure (zero grain boundaries)
- Vickers hardness 2200 HV (3× harder than tungsten carbide)
- Flexural strength 895 MPa
2. Optical Excellence
- Refractive index 1.76 for brilliant light refraction
- Pleochroism: Deep red (E∥c) to purplish-red (E⊥c)
- Fluorescence: Intense red under UV (694nm emission line)
3. Precision Manufacturing
- Dimensional tolerances ±0.005mm
- Angular accuracy ±0.01°
- Surface flatness λ/8 @ 633nm
4. Environmental Resistance
- Thermal shock resistance >800°C quench
- Chemical inertness (pH 0-14 except HF)
- Radiation stability (10⁸ rad gamma)
5. Customization Options
- Shapes: Round, square, polygonal, complex 3D
- Finishes: Mirror, satin, anti-glare textured
- Coatings: AR, hydrophobic, conductive
Applications
1. Horology & Jewelry
- Luxury watch crystals
- High-end chronograph pushers
- Transparent casebacks
2. Industrial Design
- Premium control knobs
- Aircraft instrument windows
- Executive pen clips
3. Optical Engineering
- Laser cavity endplates
- Spectrometer reference cells
- Interferometer optics
4. Medical Technology
- Surgical instrument windows
- Dental handpiece optics
- Implantable sensor covers
5. Defense Systems
- Rangefinder optics
- Tactical sight windows
- Missile guidance domes
Specifications
Parameter | Specification |
|---|
| Crystal Structure | Hexagonal (R3c space group) |
| Dopant Concentration | 0.8-1.2 wt% Cr₂O₃ |
| Density | 3.98 g/cm³ |
| Young's Modulus | 345 GPa |
| Poisson's Ratio | 0.25 |
| Fracture Toughness | 2.5 MPa·m½ |
| CTE (∥c-axis) | 5.3×10⁻⁶/K |
| Dielectric Constant | 9.3-11.5 (1kHz-10GHz) |
Q&A
Q1: How does red sapphire compare to synthetic ruby?
A1: While chemically similar, our red sapphire has tighter color
control (±2% ΔE) and lower inclusion density (<0.1ppm) versus
standard rubies.
Q2: Can the red color fade under sunlight?
A2: No - the Cr³⁺ coloration is permanent, stable up to 1200°C with no UV degradation.
Q3: Are conductive coatings available?
A3: Yes - ITO coatings with <20Ω/sq resistivity maintain >80%
transmission.
