Customizable 0.15mm Monocrystalline Al2O3 Sapphire Bearing with 9 Mohs Hardness

Product Specification

Product Description:

Engineered for the elite world of horology and micro-mechanical engineering, these 0.15mm synthetic sapphire bearings represent the pinnacle of friction reduction and component longevity. While optical transparency is a natural byproduct of our high-purity single-crystal growth, the true value of these micro-components lies in their mechanical performance.

The defining attribute of our sapphire bearings is an ultra-low surface roughness (Ra < 0.02um). This mirror-polished finish, achieved through proprietary diamond-lapping techniques, ensures a near-zero coefficient of friction against steel pivots. In a mechanical watch movement, this translates to superior energy transmission and reduced power-reserve depletion.

With a Vickers Hardness of 2000HV, these bearings are virtually immune to wear, maintaining their structural geometry for decades without deformation. Unlike traditional metal bushings, our sapphire jewels are chemically inert and non-porous, preventing the oxidation of lubricants and ensuring consistent performance in high-humidity or temperature-variable environments.

Designed with a sub-micron dimensional tolerance, these bearings provide the perfect concentricity required for high-frequency balances and complex gear trains. They are the essential choice for watchmakers and instrument engineers who demand "lifetime" durability and uncompromising precision.

Key Features:

Thermal Resistance:Withstands temperatures above 2000 °C, maintaining stability in extreme heat(continuous use around 1500°C and thermal cycling environments.

Hardness & Durability: Mohs hardness of 9, offering outstanding resistance to scratches, wear, and mechanical damage.

Chemical Stability: Highly resistant to acids, alkalis, and corrosive gases, ensuring long service life in harsh chemical environments.

Fully Customizable Dimensions:Available in customized outer diameter, inner diameter, length, and surface finish touch to meet specific application requirements.

Applications:

1. Micro-Galvanometers and Analog Meters, these bearings act as the pivot points for ultra-lightweight indicator needles. Because sapphire maintains a mirror-polished surface (Ra < 0.02um), it eliminates "stiction," allowing the needle to respond to infinitesimal changes in electrical current with perfect repeatability and zero lag.

2. Critical in Miniature Aerospace Gyroscopes. In high-RPM navigation sensors, these bearings provide the extreme hardness (9 Mohs) required to withstand constant centrifugal force. Unlike metal bushings, sapphire will not thermally expand or "gall" at high speeds, ensuring the gyroscope maintains its orientation during rapid flight maneuvers.

3. In Micro-Fluidic Flow Meters, sapphire bearings support the tiny impellers used to measure aggressive chemical or medical fluids. Being chemically inert, they do not corrode or leach contaminants into the fluid stream, ensuring long-term calibration accuracy in environments that would degrade even high-grade stainless steel.

Specifications:

FAQs:

Q: What material is the sapphire tube made of?

A: It is made from high-purity single crystal aluminum oxide, offering excellent mechanical, thermal, and chemical properties

Q: What is the maximum working temperature?

A: Sapphire tubes can operate continuously at 1500-1700°C, with higher temperatures possible for short-term exposure depending on the environment.

Q: Are the dimensions customizable?

A: Yes, we offer full customization including outer diameter, inner diameter, length, wall thickness and surface finish according to your requirements.

Q: What surface finishes are available?

A: Both polished and as-ground/as-grown surfaces are available. Optical-grade polishing can be provided for applications requiring high transparency.

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