Yu Shengwang introduced that using hydrogen and methane as raw materials, diamond synthesized by chemical vapor deposition has excellent physical and chemical properties, and has been widely used in the fields of machining, automotive, aerospace, defense and nuclear industries. However, the two problems of high production cost and high quality diamond preparation technology are the main reasons for limiting the large-scale replacement of other materials by CVD diamond. "This technology is strictly protected by technology. Some domestic enterprises need to buy three or four million yuan of related equipment abroad, and the equipment that is returned is often not used normally." Yu Shengwang said. The microwave plasma CVD diamond device with independent intellectual property rights developed by the Superhard Materials Laboratory of the Institute of Surface Engineering of Taiyuan University of Technology, which is located in Shengwang, is only one-fifth of the cost of similar foreign equipment. The rate is 2-4 times that of the peer. Yu Shengwang also told reporters that the high-end diamond products produced by the project have passed professional testing and were used in major defense projects undertaken by the University of Electronic Science and Technology (Chengdu) and the China Institute of Engineering Physics. At present, the project has applied for 14 invention patents and has authorized 4 projects.
Yu Shengwang is a lecturer, master and doctor of engineering at the Institute of Surface Engineering at Taiyuan University of Technology. This Shandong graduated from Taiyuan University of Science and Technology has a deep affection for Shanxi. In 2012, he obtained a doctorate in materials science from Beijing University of Science and Technology. He chose to return to work in Taiyuan. Yu Shengwang introduced that his team is currently composed of more than a dozen teachers and students, and the research and development of this project has been carried out for four or five years. During this period, the research and development expenses of the project were all invested by the team members. Everyone invested more than 100,000 yuan to several thousand yuan, and has already invested several million yuan.
To continue research, there must be sustained capital investment. According to Shengwang, they currently have three machines, but their production capacity is limited. Their technological achievements can only be realized if they are transformed by the market, and their technological innovation can continue. “A lot of companies outside the province contact us. One Shenzhen company is willing to invest 5 million yuan, and Ningbo enterprises also want to buy our technology, but we still want this result to be transformed in Shanxi.†Yu Shengwang It is said that Shanxi has a very rich coalbed methane resources. With the improvement of mining technology, the deep processing and utilization of coalbed methane has become an urgent problem for the industry. The market for synthetic diamonds is also in Shanxi, and the demand for coal mining equipment manufacturing and tool manufacturing is also great. Therefore, this project not only solves the problem of efficient utilization of coalbed methane resources, but also greatly reduces the production cost of diamond products, realizes deep processing of coalbed methane, promotes the progress of CVD diamond synthesis technology, and promotes the traditional coal industry to high-tech industries. change.
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:
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.
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.longsbearings.com