Custom Through-Hole Sapphire Bearings Precision Sliding Bearing Based on Drawings
A sapphire bearing is a precision sliding bearing that uses synthetic sapphire (single-crystal aluminum oxide, α-Al₂O₃) as its core material, formed through high-temperature melt growth and precision machining. With a Mohs hardness of 9 (second only to diamond), it exhibits an extremely low friction coefficient, excellent wear resistance, and strong corrosion resistance. Recognized as an ideal bearing material for instruments, control devices, and high-precision mechanical systems, it maintains long-term stable operation under harsh conditions such as high temperatures and strong corrosive environments.
Sapphire Bearings Characteristic
- Exceptional Hardness: Its outstanding hardness provides wear and impact resistance, reducing friction loss during equipment operation and extending service life.
- Strong Environmental Adaptability: It can withstand high and low temperatures (-200°C to 500°C), humidity, chemical corrosion, and other complex working conditions.
- Stable Precision: The high surface finish ensures accurate positioning of equipment during high-speed or micro-operation.
Sapphire Bearings Application Fields
- Precision Instruments: In laboratory spectrometers, analytical balances, and medical equipment like CT scanners and blood analyzers, sapphire bearings maintain stability during high-frequency, high-precision operations, preventing measurement errors caused by wear.
- Industrial Automation: Used in servo motors of automated production lines, robotic arm joints, and spindle components of CNC machine tools, their high wear resistance reduces downtime for maintenance and improves production efficiency.
- Equipment for Extreme Environments: Aerospace instruments (e.g., gyroscopes) can withstand high-altitude low temperatures and low pressure; deep-sea exploration equipment (e.g., underwater robots) can resist seawater corrosion; outdoor meteorological monitors can endure weather exposure, ensuring continuous and reliable data acquisition.
- Consumer Electronics & High-End Equipment: In the movements of smartwatches and mechanical watches, sapphire bearings ensure accurate timekeeping; in laser cutting equipment and optical communication modules, they reduce component wear and extend the equipment's service life.
Sapphire Bearings Key Data
| Parameter Category | Specific Value/Characteristic |
| Material Composition | Synthetic Sapphire (α-Al₂O₃), purity ≥99.99% |
| Mohs Hardness | Level 9 |
| Friction Coefficient | 0.08–0.12 (against steel) |
| Temperature Range | -200°C ~ +1800°C |
| Surface Roughness | Ra ≤0.005μm (mirror-grade polish) |
| Corrosion Resistance | Resistant to acids/alkalis (except HF), oxidation |
| Thermal Conductivity | 25.12 W/m·K (@100°C) |
| Dielectric Constant | 11.5 (∥c-axis), 9.3 (⊥c-axis) |
1. Q: How does a jewel bearing work?
A: A jewel bearing operates by allowing a metal spindle to rotate within a pivot hole lined with a hard gemstone material (like synthetic sapphire or ruby), which minimizes friction through its ultra-smooth, hard surface.
2. Q: What are the types of bearings?
A:Bearings are primarily categorized into two main types: rolling element bearings (such as ball bearings and roller bearings) and plain/sliding bearings (like jewel bearings or fluid bearings), each designed to support different load directions and motion requirements.
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