EXSEV for EXTREME SPECIAL ENVIRONMENTS CERAMIC BEARINGS Japan QualityJTEKT JTEKT CORPORATION JTEKT Koyo

World’s first successful practical application of ceramic bearings “Aren’t there any bearings that can be used in seawater?” …One of our customers asked this question, triggering our efforts to develop the ceramic bearing. Initially, we attempted to use alumina as the raw material, but it split quickly and cracks developed… Following this, research stalled and ended after approximately five years. Research resumed again in 1978; this time with the development team consisting of five members. Machine tools Film manufacturing equipment Power generation equipment Industrial furnaces Production equipment...

Introduction to Application Examples CERAMIC BEARINGS Machine tools CERAMIC BEARINGS Spindle (Angular Contact Ball Bearing) Product : Hybrid Ceramic Bearings Machine tool spindle bearings are required to have superior rotational performance at extremely high speeds, quick acceleration/ deceleration, high rigidity, and reduced temperature rises. Hybrid Ceramic Bearings, which satisfy these requirements, are widely used in this application. High temperature Electric field Magnetic field High speed Abrasion resistance High temperature Electric field Magnetic field High speed Abrasion resistance...

Liquid Crystal Panel Bonding and LC Sealing Furnace Product : Hybrid Ceramic Linear Motion Ball Bearings Substrate bonding press jigs for use in furnaces must be low in particle emissions and have a long service life under high temperature conditions. The Clean Pro Hybrid Ceramic Linear Motion Ball Bearings are widely used for such jigs. Suitable for clean environments thanks to low particle emissions ^srConditionrB^^H Stroke speed: 5 mm/s Temperature: 200°C Ambient pressure: Normal pressure Lubrication: Clean pro coating Magnetic field Tube Annealing Furnace Guide Rolls Product: Hybrid Ceramic...

Introduction to Application Examples CERAMIC BEARINGS Production equipment CERAMIC BEARINGS Aluminum Electrolytic Capacitor Manufacturing Equipment Product: High Corrosion Resistant Ceramic Bearings In an aluminum foil electrolytic capacitor manufacturing equipment, a strong acid solution is used to treat the aluminum foils. High Corrosion Resistant Ceramic Bearings are widely used in such highly corrosive environments. ● Corrosion resistance to strong acid solution High temperature Electric field Magnetic field High speed Abrasion resistance Roller Aluminum foil Chemical solution (Hydrochloric...

Introduction to Application Examples Semiconductor manufacturing equipment CERAMIC BEARINGS Transfer Robot for Semiconductor and LCD Manufacturing Equipment High temperature Electric field Magnetic field High speed Abrasion resistance Product: K Series Full-Complement Hybrid Ceramic Ball Bearings For application in transfer robots for semiconductor and liquid crystal manufacturing equipment, bearings are required to be low in particle emissions and have a long service life. Bearings may be delivered incorporated in arm units for improved assemblability and maintainability. ● Applicable to vacuum...

Introduction to Application Examples CERAMIC BEARINGS Semiconductor manufacturing equipment CERAMIC BEARINGS CERAMIC BEARINGS Wafer Transfer Equipment For application in wafer transfer equipment, low particle emissions performance is required. For such devices, Clean Pro Hybrid Ceramic Linear Way Bearing Units are widely used. High temperature Product: Hybrid Ceramic Linear Way Bearing Units (with special features) Clean Electric field Magnetic field High speed Abrasion resistance Electric field Magnetic field Abrasion resistance High temperature Electric field Magnetic field Abrasion resistance...

Introduction to Application Examples CERAMIC BEARINGS Medical equipment CERAMIC BEARINGS Blood Contrifuge Corrosion resistance is required of bearings to be used in blood contrifuge especially to physiological saline. Hybrid Ceramic Bearings with bearing rings coated with a corrosion resistant film are suitable for such corrosive environments. ● Corrosion resistance to physiological saline High temperature Product: Hybrid Ceramic Bearings (with special coating) Clean Electric field Magnetic field High speed Abrasion resistance High temperature Electric field Magnetic field Abrasion resistance...

Introduction to Application Examples CERAMIC BEARINGS Automobiles, Motorcycles CERAMIC BEARINGS Bearings supporting the main shaft of the turbocharger are responsive during acceleration and durable when using low-viscosity, dirty oil. Hybrid ceramic bearings with superior reliability are utilized. High temperature Electric field Magnetic field High speed Abrasion resistance Product: Hybrid Ceramic Bearings Product: Hybrid Ceramic Bearings Excellent abrasion resistance even under severe environmental conditions has improved durability and reliability. Service life three times longer than that...

CERAMIC BEARINGS Properties of ceramic materials CERAMIC BEARINGS 2 Rolling fatigue of ceramic materials Table 1 below lists the mechanical and physical properties of major ceramic materials used as bearing materials. Table 2 compares silicon nitride and high carbon chromium bearing steel. The individual ceramic materials were tested for rolling fatigue under oil lubrication and under water lubrication, to evaluate their applicability as bearing material. Figs. 1 and 2 show the results of the tests. The figures indicate that each ceramic material has a certain level of rolling fatigue strength...

Ceramics Production Processes CERAMIC BEARINGS Ceramic materials suitable for rolling bearings Production processes Table 3 shows the results of evaluating the ceramic materials in terms of their characteristics and the rolling fatigue strength. Among the ceramic materials tested, silicon nitride is the most suitable as rolling bearing material. JTEKT uses the silicon nitride produced by the hot isostatic pressing (HIP) method as the standard ceramic material for bearings. With silicon nitride, characteristics such as density and strength can vary greatly depending on the manufacturing method...