Products Description

Ceramic bearings are advanced bearings that utilize ceramic materials (primarily silicon nitride or zirconia) to form the rolling elements, and sometimes even the inner and outer rings. They represent a significant technological innovation over traditional steel bearings, designed to meet the demands of extreme operating conditions and high-performance applications. Their core value lies in leveraging the unique physical and chemical properties of ceramic materials to overcome many inherent limitations of steel bearings.

ceramicstimes

Product name	Ceramic bearing
Material	Alumina ceramic, Silicon carbide ceramics Silicon nitride ceramics
Color	Customized according to the client's requirements
size	Customized according to the client's requirements
Machining accuracy	±0.001mm
Packaging	Carton /Pallet/Wooden case (According to client requirement )
Delivery time	Standard Product-Within 3 days
Items Design	According to the client's drawing or samples
Features	Good quality, low price, Multiple factories, deliver to you based on the one closest to your location
Application	Industrial Ceramics
Certificate	ISO, CE

Ceramics performance parameter

Number	Performance	Unit
			99 Porcelain	99 Porcelain	995 Porcelain	Zirconia	Silicon Carbide	Silicon Nitride	Advanced Ceramics
			Al2O3	Al2O3	Al2O3	Zirconia	SiC	Si3N4	Superior ceramics
1	Density	g/cm3	3.85	3.9	3.9	6.00~6.10	3.0-3.1	3.1~3.26	4.4
2	Flexural strength	MPa	340	450	370	≥1100	450～500	700~900	1000
3	Fracture toughness	MPa·m1/2	5.6-6	6.2	5.6-6	8	4	6.4	5
4	Dielectric constant	εr(20℃,1MHz)	9.5	9.5	9.7	10.6	9~10	/	10~30
5	Hardness	GPa	15-16			15	24	15~19	17.1
	Hardness	HRC	79-80			79	87	79-83	82
6	Volume resistivity	Ω·cm(20℃)	10 14	10 14	10 14	10 14	10-2~103	10 14	10 14
7	Elastic modulus	GPa	330	350	380	220	440	320	220
8	Coefficient of thermal expansion	×10-6/k	7.6	7.6	7.6	10.2	4.1	3.0~3.2	9
9	Compressive strength	MPa	2210	2500	2300	2500	2500	2300	2500
10	Abrasions	g/cm2	0.1	0.1	0.1	0.01	0.01	0.01	0.1
11	Thermal conductivity	W/m×k(20℃)	34	38	35	27	84	77~87	2.2
12	Poisson's ratio	/	0.22	0.22	0.22	0.3	0.16	0.24	0.18
13	Insulation strength	kv/mm	28	28	28	32	100	20	24
14	Temperature	℃	1650	1650	1650	1520	1600	2200	1700- 2200

Performance Characteristics

The performance advantages of ceramic bearings primarily stem from the inherent properties of ceramic materials:

Exceptional Lightweight: Ceramics have a much lower density than bearing steel (silicon nitride is about 40% the density of steel). The significantly reduced mass of the rolling elements dramatically decreases centrifugal force during high-speed rotation, thereby reducing friction, heat generation, and skidding, creating conditions for high-speed operation.
Superior Rigidity: The elastic modulus of ceramics is higher than that of steel, meaning less deformation under load. Increased rigidity leads to higher system stiffness, which benefits the host equipment's rotational accuracy and dynamic response speed.
Outstanding Temperature Resistance: Ceramics can withstand temperatures above 500°C without grease lubrication, with an even wider temperature range using special lubricants. They also exhibit no cold brittleness at low temperatures, giving them a far wider applicable temperature range than steel bearings.
Excellent Corrosion Resistance: Ceramic materials are highly inert to most corrosive media such as acids, alkalis, and salts. They can operate stably for long periods in highly corrosive environments without requiring special surface treatments.
Excellent Electrical Insulation: Ceramics are good electrical insulators, completely preventing electrical erosion caused by shaft currents. This is crucial for applications like variable-frequency motors and generators.
Low Thermal Expansion: The coefficient of thermal expansion for ceramics is much lower than that of steel. This means changes in bearing preload and clearance due to temperature fluctuations are minimized, resulting in better system thermal stability.
Long Life and High Reliability: Ceramics are hard and wear-resistant, and they do not suffer from the fatigue spalling issue inherent to steel. Under clean lubrication and appropriate loads, their fatigue life far exceeds that of steel bearings. Additionally, their self-lubricating properties offer a degree of safety in harsh conditions like oil starvation.
Non-Magnetic: Ceramics are completely unaffected by magnetic fields, making them suitable for precision instruments and special equipment requiring absolute non-magnetism.