Hybrid Ceramic Bearings 6008-2RZTN9/HC5C3WT with Ceramic Balls

Designation: 6008-2RZTN9/HC5C3WT

Type: Deep Groove Ball Bearings

Dimension: 40*68*15mm

Weight: 0.18kg

Feature: Ceramic balls: silicon nitride (Si3N4)

Suffix of 6008-2RZTN9/HC5C3WT Bearings

TN9: PA66 cage

HC5: Rolling Elements Of Silicon Nitride

WT: Grease for long service life at high speeds and high temperatures

C3: larger than normal clearance.

With the development of the world economy, the machinery industry is progressing faster and faster. With the innovation of new technologies and new materials, hybrid ceramic ball bearings have been developed. The use of hybrid ceramic ball bearings has made up for the bearing steel material and all-ceramic bearings. The cost of chrome steel bearings are low level, but there is almost no corrosion resistance; all ceramic bearings have good corrosion resistance, but they are not impact resistant, and the price is relatively expensive.

Under such circumstances, the hybrid ceramic bearing was born. It not only has a certain corrosion resistance effect, the most important thing is that it has the self-lubricating effect of ordinary bearings, and the price is much lower than that of full ceramic bearings.

Hybrid single row deep groove ball bearings with seals on both sides have rings made of bearing steel and rolling elements made of bearing grade silicon nitride (Si3N4), which make the bearings electrically insulating. The integral sealing can significantly prolong bearing service life because it keeps lubricant in the bearings and contaminants out. The silicon nitride elements not only provide protection from electric current damage but also, when compared to same-sized bearings with steel rolling elements, provide enhanced bearing performance, extended bearing service life, higher speed capability, high wear-resistance, high bearing stiffness, reduced risk of smearing and false brinelling, and less sensitivity to temperature gradients, making them suitable for use in dificult conditions and contaminated environments.

1. What is a hybrid ceramic bearing

Using ceramic materials to replace steel and other metal materials as rolling elements, the purpose is to use ceramic balls that are better than bearing steel balls in wear resistance, corrosion resistance, high temperature resistance, electrical insulation (except SiC), non-magnetic, high strength, high rigidity, Performance such as small proportion.

The use of ceramic materials can make the bearing run normally at higher speeds, harsher environments and low lubrication situations, and can reduce wear, reduce noise, reduce vibration, and make maintenance easier, so as to achieve longer bearing life and greatly improve Its performance and reliability. Ceramic materials suitable for making bearings.

Hybrid ceramic bearings include hybrid ceramic ball bearings and hybrid ceramic cylindrical roller bearings. hybrid ceramic angular contact ball bearings, Hybrid insert bearings (pillow block bearings). Hybrid ceramic bearings are assembled from bearing steel rings and bearing-grade silicon nitride rolling elements (Si3N4). The bearings have electrical Insulation characteristics.

Silicon nitride rolling elements can provide higher bearing performance even under harsh working conditions, thereby prolonging the service life of the bearing.

Hybrid ceramic ball bearings, especially silicon nitride ball hybrid ceramic bearings, have the characteristics of low density, high hardness, low friction coefficient, anti-magnetic and electrical insulation, wear resistance, self-lubricating and good rigidity, good acid and alkali resistance, self-lubricating function, High temperature resistance above 300°C, high wear resistance, high speed greatly reduces rolling, friction and heat generation, long service life is 3 to 5 times that of all-steel bearings, light weight, ceramic material is 60% lighter than steel, and the same rigidity The elastic mold of ceramic material is 50% higher than that of bearing steel.

Hybrid ceramic ball bearings are particularly suitable for high-speed, high-precision and long-life steel-ceramic hybrid bearings rolling elements (the inner and outer rings are made of metal). Generally, the inner and outer rings are made of bearing steel or stainless steel, and the ceramic balls can be made of ZrO2, Si3N4, or SiC.

Among them, Si3N4 has superior comprehensive performance and has become the preferred material for steel-ceramic hybrid ceramic bearings.

Bearing structure: bearing steel ferrule, or stainless steel ferrule + ceramic ball + nylon retainer + rubber seal

Second, the advantages of hybrid ceramic bearings

(1) High temperature resistance

The thermal expansion coefficient of ceramic balls is small, and the bearing balls will not expand due to temperature in high temperature environments, which greatly increases the operating temperature of the entire bearing. The temperature of ordinary bearings is about 160 degrees, and the temperature of ceramic balls can reach more than 220 degrees.

(2) High speed

Ceramic balls have oil-free and self-lubricating properties, and the friction coefficient of ceramic balls is small, so ceramic ball bearings have a very high speed. According to statistics, bearings using ceramic balls are more than 1.5 times the speed of ordinary bearings.

(3) Long lifespan

Ordinary bearings are used in water and high temperature environments, the grease is easy to wash off or dry out, so the bearing will soon be damaged. Using ceramic balls as rolling elements, this avoids the occurrence of premature bearing damage caused by the drying of grease in ordinary bearings; according to our test and some customer feedback, the service life of the bearing after using ceramic balls is 2- 3 times.

(4) Insulation

The rolling elements are made of ceramic balls, which can achieve insulation between the inner ring and the outer ring of the bearing. Because ceramic balls are insulators, using ceramic balls between the inner and outer rings of the bearing can achieve the effect of insulation. In this way, the bearing can be used in a conductive environment. This is also the biggest advantage of hybrid ceramic bearings.

(5) Oil-free and self-lubricating

Ceramic balls have oil-free and self-lubricating properties, that is to say, even if the grease dries out, the bearing can still operate, so ceramic ball bearings can be grease-free.

Third, the use of hybrid ceramic bearings:

1. Car

For the bearings used in automobiles, the turbo charger bearings have the highest requirements for speed, which require the bearings to have good acceleration responsiveness, as well as low torque, low vibration and low temperature rise under high-speed rotation. Due to its low temperature rise during operation, it can reduce the amount of lubricating oil, so the oil stirring resistance is reduced, the bearing torque is reduced, and the speed is increased. In addition, rail vehicles also use it, and its durability and reliability under harsh conditions have been proven.

2. Motor

Electric motors can be used to achieve permanent insulation. When the motors are used for deceleration and energy-saving devices, internal leakage can cause arcing.

3. Aero Engine

In the fuel pump of an aero engine, it can work in liquid oxygen and liquid hydrogen for a long time. It has been proven that it will not be damaged after 50 launches.

4. Aircraft parts

The aircraft manufacturing industry has used ball screws equipped with ceramic balls for aircraft flap adjusters, and has also tried to use hybrid ceramic bearings in gas turbine engines.