Zirconia (ZrO2) ceramic bearing 6909 Xingruida deep groove ball high temperature bearing rolling ceramic bearing supplier

Differences between zirconia and silicon nitride for ceramic bearings

Silicon nitride ceramic ball Bai is a precision ceramic sintered at high temperature in a non oxidizing atmosphere. It has high strength, high wear resistance, high temperature resistance, corrosion resistance, acid and alkali resistance, can be used in seawater for a long time, and has good electrical and magnetic insulation properties. Its density is 3.20g/cm3, which is almost 1 / 3 of the bearing steel. Its weight and centrifugal force are small when rotating. It can realize high-speed operation.

It can be used in the environment without high pollution of lubricating medium. Become the preferred material of ceramic bearing and hybrid ceramic ball bearing. Zirconia ceramic ball has high strength and toughness, good wear resistance, high temperature and corrosion resistance, high stiffness, non-magnetic and electrical insulation at room temperature. When the temperature is 600 ℃, the strength and hardness of zirconia ceramic ball are almost unchanged, and its density is 6.00g/cm3,

The thermal expansion rate is close to that of metal. If the thermal expansion rate is close to that of metal, it can be used in conjunction with metal.

The primary color of high purity ZrO2 is white, yellow or gray when it contains impurities, the density of zirconia is 5.6g/cm3, and the melting point is 2715c. ZrO2 has good heat resistance, insulation and corrosion resistance.

TZP is commonly used as zirconia structural ceramic material. The addition of Y2O3 can inhibit the grain growth and stabilize the crystal transformation of zirconia

In other words, among all polycrystalline ceramics, the toughness is higher.

The density of zirconia ceramics per cubic centimeter is as high as 5.95-6.05g/cm3. Among the four materials (sign4, ZrO2), the toughness of zirconia ceramics is higher, 8Mpa

The thermal expansion coefficient is 10.5x10 * / C, which is close to the thermal expansion coefficient of metal. It can meet the requirements of good bonding with metal, but the size is stable

The rolling fatigue contact failure mode is destructive fragmentation, which is not as stable as silicon nitride in some critical situations.

Zirconia ceramic has self-lubricating property, which can solve the pollution and inconvenience caused by lubricating medium; it has good corrosion resistance, and can be used in medium acid, medium alkali, sea water and other media; it has high temperature resistance, and the strength and hardness of zirconia ceramic are almost unchanged at 600C; it has no magnetic conductivity and insulation, and can also be used in magnetic field, and can not conduct electricity.

The reason of zirconia bead broken?

In the normal use of the sand mill, zirconia beads occasionally break. What are the reasons for zirconia beads breaking? Is it the zirconia beads themselves or the process parameters?

1. Judgment of normal wear and breakage of zirconia beads

In general, the zirconia beads that work for a period of time become smaller and have smooth surface without edges and corners, which should be the wear of normal beads; on the contrary, if there are angular and flake shaped beads in the beads, it should be broken beads.

2. Causes of broken beads

2.1 bead quality

Glass beads, zirconium silicate beads and pure zirconium beads are popular in the market. In terms of production process, they are basically two kinds of electric fusion method and sintering method. Beads are formed in hot air, cold air or electrolyte. If the parameters of a key technology are not well controlled, fragile beads will be produced: bubble beads, snowman beads, tail beads and flat (oval) beads. Due to the stress concentration area, these beads are easy to break during grinding, which is the quality problem of the beads themselves. Therefore, when selecting the beads, we should try to avoid such beads.

2.2 equipment and process parameters

The strength of this kind of bead is not better than that of a certain type of sanding mill. For example, the dyno mill ECM horizontal sanding mill in Switzerland and the DCP vertical sanding mill in Drais in Germany are usually recommended to use pure zirconium beads because of the high energy density input.

In addition, under the normal operation of the sand mill, zirconia beads are subject to a pressure of about 1kg. Compared with glass beads which can bear about 5000kg of force and zirconium silicate beads which can bear 9000 kg of force, the stress of zirconia beads in the sand mill is negligible. Therefore, the reason for bead breaking should be focused on the equipment and technology, and corresponding solutions should be taken.

To sum up, there are two main reasons for zirconia bead breakage: one is the quality problem of the bead itself, which is the secondary reason; the other is that the equipment and process parameters are not suitable for this kind of bead, which is the main problem. Therefore, to fully understand their own equipment parameters and processes, and then to choose the appropriate zirconia beads, in order to achieve the ideal grinding effect.

The zirconia ceramic bearing in domestic CPU radiator stainless steel shaft and copper shaft sleeve have the following disadvantages

1、 Zirconia ceramic bearings are not wear-resistant and cannot be lubricated in use.

2、 Zirconia ceramic bearing CPU radiator mostly runs at high speed, so it is generally noisy, easy to heat, easy to cause the fan burned.

Zirconia ceramic bearings have the following advantages:

1、 Zirconia ceramic bearing is wear-resistant, high hardness, low noise, impact resistant, easy to provide constant quality and long service life.

2、 Zirconia ceramic bearing can increase the winding space, torque, speed and blade space, and improve the fan efficiency.

3、 Zirconia ceramic bearing has high temperature resistance, no deformation and distortion when the temperature is less than or equal to 1000 ℃, and no oil lubrication when running at high speed.

4、 Zirconia ceramic bearing is more suitable for working in harsh environment. Such as acid, alkaline environment, oxidation environment, etc.

5、 Zirconia ceramic bearing has low density, non-magnetic and strong insulation.

6、 Zirconia ceramic bearing has low heat conduction, low CTE and wear resistance only inferior to diamond.

Shenzhen Xingruida Bearing Co., Ltd. is a private high-tech enterprise, which is mainly engaged in R & D and large-scale production of special bearings and structural parts of various materials. It is a manufacturer of special bearings with certain scale strength integrating R & D, design, manufacturing, sales and service, The first-class production equipment and testing instruments and methods can fully meet the processing requirements of various types, specifications, accuracy levels and special use of bearing products.

At present, the product structure is mainly divided into: zirconia ceramic bearings, ceramic structural parts, all ceramic bearings, mixed ceramic ball bearings, high-performance plastic bearings, non-magnetic stainless steel bearings and other kinds of special non-standard special bearings. Products are oil-free self-lubricating, widely used in semiconductor production and assembly, petroleum, chemical, electronics, electroplating equipment, textile, food, medical, aerospace and other fields.

The company has professional senior engineers engaged in the development of all kinds of special high-performance bearings and molds. They have high R & D ability, exquisite design and development ability, superb manufacturing technology and rich experience in solving product applications.