The full ceramic ball bearings listed below are supplied with rings and balls made from zirconium dioxide (ZrO2). These zirconia bearings are available as full complement (no cage) or with cages made from PTFE, PEEK or 316 stainless steel.
These are non magnetic, non-conductive and highly corrosion resistant to most chemicals although ZrO2 bearings are not recommended for prolonged contact with steam. Full complement bearings or those with a 316 stainless cage can be used up to 400°C while bearings with a PEEK or PTFE cage can cope with temperatures of up to 250°C. For temperatures below -70°C, PTFE or 316 stainless steel cages are preferred. Standard radial clearance for full ceramic bearings is C0 but other clearances can be supplied to order.
ZrO2 ceramic bearings are generally used for their extreme temperature capabilities, excellent corrosion resistance or non-magnetic properties. Other sizes can be supplied on request.
The Description of Ceramic Bearings: Cermic Ball Bearing,Full Ceramic Bearing,Hybrid Ceramic Bearing,Self-Aligning Full Ceramic Ball Bearing Shijiazhuang Longshu Mechanical & Electrical Equipment Trading Co., Ltd. , https://www.longsbearing.com
Compared to steel, Ceramic ball Bearings have many specific advantages. They offer superior corrosion and heat resistance, higher dimensional stability, and lower density, which facilitate high speed. Ceramics are superior to steel in heat and corrosion resistance, and are lightweight and extremely hard as well. Consequently, ceramic rolling bearings can be used in environments where conventional steel bearings cannot. That is to say, the superiority of these bearings makes it possible that they can be applied in some special environments.
Firstly, they can be used in corrosive environments. Compared to stainless steel bearings, hybrid and all Ceramic Bearing lasted three and twenty times longer respectively. It is presumed that water readily adheres to silicon nitride and forms a better lubrication film, leading to extended bearing life.
Secondly, they can be performed in corrosive agents. Generally, silicon nitride has excellent corrosion resistance. However, corrosion resistance varies depending on the type and quantity of sintering additives, and certain corrosive agents decrease in hardness and flexural strength. In such situation, it is can be proved that the carbide-based ceramic bearings are the most effective.
Thirdly, they can be used in high-temperature vacuum. An all-silicon nitride Ball Bearing with a self-lubricating laminated cage (mainly composed of MoS2) and with MoS2-coated rings and balls proved superior in durability in a high-temperature vacuum environment. Compared with the hybrid bearings, the all-ceramic bearing was superior in both dynamic frictional torque and life.
Fourthly, they can be performed with poor lubrication. As ceramics are extremely hard and have outstanding wear resistance, they outperform other materials in bearing life without lubrication. According to a test, the steel bearing seized within a short period while the hybrid and all 627 Ceramic Bearings, though sustaining wear, did not. And the all-ceramic bearing sustained considerably less wear than the hybrid bearing, indicating that its endurance life is much longer.
Circular gear pump selection precautions
Circular arc gear pump in today's industrial, chemical, scientific research and other fields have a very important value, but it is also a relatively special equipment, its work not only to consider its own functional characteristics, At the same time also pay attention to arc gear pump work environment and work intensity, in short, arc gear pump selection is not just a few words of sales staff can be summarized. Circular gear pump selection precautions Circular gear pump selection Note: 1, the flow rate is one of the important performance data gear pump gear selection, which is directly related to the entire plant's production capacity and delivery capacity. Cycloid gear pump election to the maximum flow as the basis, taking into account the normal flow, in the absence of maximum flow, it is usually desirable 1.1 times the normal flow as the maximum flow. General industrial pumps in the process can ignore the leakage in the pipeline system, but must consider the impact of process changes on the flow. 2, the pressure required to install the system is another important performance data selected gear pump, the general need to enlarge the 5% -10% margin pressure to choose cycloid gear pump model. This includes: sump pressure, sump pressure, pressure drop in the piping system. 3, arc gear pump system devices by the pipeline layout conditions refers to the height of the liquid, liquid transport distance, the direction of liquid transport. For system pressure calculation and power check. Pipeline system data such as: diameter, length, type and number of pipe fittings, oil sump to the pressure tank geometry and so on. 4, the liquid properties and the physical, chemical and other properties of the liquid medium, the physical properties of the temperature c density d, viscosity u, medium particle diameter and gas content, etc., which involves the system pressure, the required power calculation And the type of suitable pump: chemical properties, mainly refers to the liquid medium chemical corrosion and toxicity, is the choice of gear pump material and choose which type of shaft seal an important basis. Through the above four points of analysis, we can find arc gear pump selection considerations should have what content, in today's rapid technological development of these times, the use of many tools may have been very simplified, but for some devices to Said that still need to continue in the traditional way. Just like the use of arc gear pump, we absolutely can not forget arc gear pump selection considerations. This article is copyrighted industry interconnect (Xiamen) Co., Ltd. All are welcome to reprint, please indicate the source and author of: Asian pumps Network (CEO QQ / micro letter: 18,189,528) Editor: Coco (QQ / micro-channel: 97,129,096) starting: http : //beng.liuti.cn/ (Service Hotline:)