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
The types and concentrations of suitable foliar spray fertilizers are: (1) Urea has urea and the concentration is 0.3%. (2) Phosphate fertilizer has ammonium phosphate and potassium phosphate, and the concentration is 0.5-1%. (3) Potassium fertilizer has potassium chloride and potassium sulfate, and the concentration is 1%.
Foliar spray application period: It can be used from the beginning of the fruit tree to the leaf before it stops growing.
The method of use is as follows: the fertilizer can be directly added with water according to the required concentration, and then sprayed after being dissolved. The jet should be avoided at noon with strong sunlight, from 8:00 am to 11:00 pm, from 2 pm to 6:30 pm. When spraying, focus on the back of the sprayed surface, because the back of the leaves has less horniness and is easy to absorb. The number of sprays is usually sprayed once every 10-15 days. It can be combined with spraying pesticides, and the fertilizer is sprayed together in the pesticide.
The type of fertilizer can be determined according to the nutritional status of the tree and the amount of fruit. The results are many, consume more nutrients, can be sprayed with nitrogen fertilizer to supplement nutrition, can significantly enhance the next year's flower yield, improve the fruit yield and quality of the year; Wangshu, saplings have no output in the current year, should spray phosphorus, potassium fertilizer, promote The formation of flower buds, in order to achieve early results, the purpose of early yield. 
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.
Fruit leaf surface spraying technology
Fruit leaf surface spray fertilizer technology Foliar spray fertilizer, also known as root dressing, is a kind of fertilization measure that can not be ignored in fruit tree production. This method saves labor, labor, and quick results, and has high utilization rate. Fruit trees such as apples, pears, hawthorns, etc., can increase the fruit set rate during flowering period; the leaves and fruits can be sprayed during the growth period to promote fruit enlargement and increase chlorophyll content.
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