Zirconia ceramic balls (ZrO2) and silicon nitride ceramic balls (Si3N4) are White Zirconia Ceramic both types of ceramic balls. They are usually widely used in the field of high-precision machinery industry, or in the field of abrasive materials. The main differences between zirconia ceramic balls and silicon nitride ceramic balls are:
1. Color.
More than 80% of zirconia ceramic balls are mainly white, and white Machinable Ceramic zirconia ceramic balls are their natural color. But sometimes it is seen that the ceramic ball is pale yellow or gray, because the zirconia material contains a small amount of impurities. Zirconia ceramic balls have the advantages of high toughness, high flexural strength and high wear resistance, excellent thermal insulation performance, and Macor Ceramics thermal expansion coefficient close to that of steel balls.
The silicon nitride ceramic ball is mainly made of carbon black. It is extremely resistant to high temperature, and its strength can be maintained at a Silicon Nitride Parts high temperature of 1200 ° C without falling. After being heated, it will not melt into a melt. It is one of the hardest materials in the world.
2. Comparison of physical properties.
In terms of physical properties of zirconia ceramic balls, they are excellent in wear resistance and corrosion resistance, while silicon nitride ceramic balls also have the same excellent performance. At the same time, silicon nitride ceramic balls also perform well in machining accuracy. Therefore, in the application field of high-precision machinery industry, such as super-precision bearings, in addition to the wide application of steel balls, Silicon Nitride Ceramics ceramic balls have also begun to be popularized in precision bearings. Compared with the bearing steel ball, the ceramic ball has the characteristics of anti-corrosion and anti-rust, and the processing accuracy is even better than that of the steel ball. At the same time, it can withstand high temperature in high temperature environment. Therefore, ceramic balls have appeared in bearings and other ultra-precision machinery fields, such as guide rails, linear sliding accessories, etc., and have a tendency to replace steel balls
What are the requirements for zirconia ceramic bearings for motors?
Geometric accuracy: The geometric accuracy of zirconia ceramic bearing parts mainly refers to the roundness, cylindricity, etc. of the journal, outer tapered surface, Morse taper hole, etc., and its tolerance should generally be limited within the dimensional tolerance range. For the inner and outer circular surfaces with high precision requirements, the allowable deviation should be marked on the drawing.
Dimensional accuracy: In order to determine the position of the shaft, the journal of the zirconia ceramic bearing that supports the bearing usually requires high dimensional accuracy (IT5~IT7). The dimensional accuracy of the journal for assembling transmission parts is generally low (IT6~IT9).
Mutual position accuracy: The position accuracy requirements of zirconia ceramic bearing parts are mainly determined by the position and function of the zirconia ceramic shaft in Ceramic Tubes the machine. Usually, it is necessary to ensure the coaxiality requirements of the journal of the assembly transmission part to the support journal, otherwise the transmission accuracy of the transmission part (gear, etc.) will be affected, and noise will be generated. For ordinary precision zirconia ceramic shafts, the radial runout of the matching shaft section to the bearing journal is generally 0.01~0.03mm, and the high-precision shaft (such as the main shaft) is usually 0.001~0.005mm.
What is the difference between zirconia ceramic balls and silicon nitride ceramic balls?
2022 06/16