Product Introduction

In the field of precision transmission under extreme working conditions, silicon nitride ceramic bearings have become a high-end solution to replace traditional metal bearings due to their unique material characteristics and excellent performance. It uses silicon nitride (Si ∝ N ₄) ceramics as the core material, integrates precision manufacturing processes, and exhibits irreplaceable advantages in harsh environments such as high temperature, corrosion, high speed, and no lubrication. It is widely used in high-end industrial fields such as aerospace, semiconductor manufacturing, and new energy equipment. ​

1、 Core materials and structural characteristics

The core components of silicon nitride ceramic bearings (rolling elements, inner and outer rings) are made of high-density silicon nitride ceramics, supplemented by high-strength engineering plastics or metal retainers, and some models are equipped with ceramic fiber sealing structures. Silicon nitride ceramics have characteristics such as low density (only 40% of bearing steel), high hardness (HV1500-1800, far exceeding HV800 of bearing steel), and low thermal conductivity. The rolling element surface is processed with ultra precision grinding, and the roundness error is ≤ 0.001mm, ensuring precise contact with the raceway. Compared with traditional bearings, the insulation properties (volume resistivity>10 ¹⁴Ω· cm) and non-magnetic characteristics of ceramic materials make them unnecessary for additional protection in electromagnetic sensitive environments. ​

2、 Key performance advantages

1. Extreme temperature adaptability and excellent high-temperature stability

Silicon nitride ceramics can maintain stable mechanical properties within the range of * * -200 ℃ to 800 ℃ * *, without the thermal expansion problem of metal bearings (with a linear expansion coefficient only one-third of that of bearing steel). Even in environments without lubrication or high-temperature oxidation (such as aviation engine auxiliary systems and metallurgical furnace conveyors), it can still operate normally, avoiding problems such as grease failure and metal softening caused by high temperatures in traditional bearings, and increasing its service life by 3-5 times. ​

2. Strong corrosion resistance, suitable for harsh media environments

Ceramic materials have natural inertness to corrosive media such as acids, bases, organic solvents, and seawater, and do not require surface coating protection. In the stirring shaft of chemical equipment and the transmission system of semiconductor cleaning equipment, it can resist the erosion of strong corrosive media such as fluoride acid and strong alkali, solve the problem of metal bearings easily rusting and contaminating media, and extend the maintenance cycle to more than 10 times that of traditional bearings. ​

3. High speed and low friction, higher operating accuracy

Low density ceramic rolling elements can significantly reduce centrifugal force (reducing centrifugal load by 60% during high-speed rotation), coupled with optimized raceway curvature design, can still maintain stable operation at speeds above 30000r/min, and reduce temperature rise by 40% compared to metal bearings of the same specifications. Its friction coefficient is as low as 0.001-0.002 (about 0.008 for metal bearings), which can reduce wear and achieve long-term maintenance free operation even under dry friction or thin lubrication conditions. ​

4. Non magnetic insulation, suitable for special working conditions

The completely non-magnetic characteristic ensures that it does not generate magnetic field interference in magnetic resonance equipment and maglev systems; Excellent electrical insulation performance can block shaft current, protect wind turbines, high-speed motors and other equipment from electrochemical corrosion, especially suitable for strong electromagnetic environments such as new energy vehicle drive motors and rail transit traction systems. ​

3、 Typical application scenarios

Silicon nitride ceramic bearings play a core role in the following high-end fields due to their unique performance:

Aerospace: High speed motors for unmanned aerial vehicles, attitude control mechanisms for spacecraft, suitable for high-altitude, low-temperature, and low-pressure environments; ​

Semiconductor manufacturing: wafer transfer robotic arm, vacuum coating equipment, resistant to plasma corrosion and vacuum environment; ​

New energy equipment: wind power variable pitch bearings, photovoltaic tracking system drive shafts, resistant to outdoor wind and sand and temperature difference impacts; ​

Medical equipment: CT machine rotating frame, MRI machine spindle, no magnetic interference and resistant to corrosion by disinfectant media; ​

High end machine tools: high-speed electric spindles, precision grinders, achieving micrometer level machining accuracy at high speeds. ​

Whether it is a highly corrosive chemical workshop or a high-temperature radiation metallurgical environment, it can operate stably and maintain long-term reliability.