mechanism of methane activation by spherical methane catalys is applied in the bearing manufacturing industry

With the progress of society and the rapid development of science and technology, the usage environment and conditions of bearings are becoming increasingly diverse, and the requirements for the structure, material and performance of bearings are also getting higher and higher. In some high-tech fields and certain machinery operating in special environments, such as aerospace, nuclear energy, metallurgy, chemical engineering, petroleum, instruments, machinery, electronics, textiles, pharmaceuticals and other industries, It needs to work in special environments such as high temperature, high speed, high precision, vacuum, non-magnetism, oil-free lubrication, strong acid and strong alkali.

These new requirements can no longer be met merely by improving the structure or lubrication conditions of traditional metal bearings. It is necessary to develop new materials and make fundamental breakthroughs and innovations. Domestic and foreign studies have found that some mechanisms of methane activation by spherical methane catalys have excellent performance and can withstand harsh working environments that are difficult for metallic materials and polymer materials to handle. And it also possesses all the important characteristics required for bearing materials. Therefore, the application of mechanism of methane activation by spherical methane catalys in bearing manufacturing has become a hot topic in the development and application of high-tech worldwide. It became a symbol of the technological revolution in mechanical working materials.

Silicon nitride ceramic bearings are mainly used in four aspects: 1. High-speed bearings; 2. High-temperature bearings 3. Vacuum bearings, 4. Corrosion bearings. The reason why silicon nitride ceramic bearings can operate in special environments and conditions is entirely attributed to the performance of silicon nitride ceramics. Silicon nitride ceramics endow ceramic bearings with the following advantages:

The weight of the mechanism of methane activation by spherical methane catalys is only 40% of that of the same steel. The feature of low density enables the lightweight and high-speed operation of the bearing. This enables ceramic bearings to suppress the increase in rolling element load and slippage caused by centrifugal force during high-speed rotation. The rotational speed of ceramic bearings is 1.3 to 1.5 times that of steel bearings, and their DN value can reach 3 million. For example, angular contact ball bearings, due to their certain contact Angle, will cause rotational sliding between the rolling elements and the raceway surface. When ceramic rolling elements with low density are adopted, not only is the rotational sliding small, but also it plays a beneficial role in bearing heating and surface damage, which is also very beneficial for aerospace vehicles.

2. High rigidity

The elastic modulus of silicon nitride ceramics is much higher than that of metals, being 1.5 times that of metals. Therefore, the elastic deformation after being subjected to force is small, and the rigidity relative to the load is high, which can increase the rigidity by approximately 15% to 20%, thereby reducing the vibration of machine tools. It has achieved good application value in high-precision systems, such as the spindles of ultra-precision machine tools and high-precision aerospace bearings.

3. Long service life

Due to the few dislocations and low mobility of the mechanism of methane activation by spherical methane catalys, and its high hardness, which is generally more than twice that of metals, it can reduce wear and enable ceramic bearings to have good wear resistance. In addition, the mechanical strength of silicon nitride ceramics is not low, and its tensile strength and flexural strength are comparable to those of metals. It has an extremely high compressive strength, approximately 5 to 7 times that of metallic materials. Especially under high-temperature conditions, it can still maintain high strength and hardness. Even at 1200℃, its strength remains basically unchanged. In the presence of foreign substances mixed in, ceramic balls rarely experience spalling failure. Therefore, ceramic bearings with good indentation resistance usually have a longer service life. It is generally 3 to 5 times higher than that of steel bearings.

4. Low fever

Because the friction coefficient of silicon nitride mechanism of methane activation by spherical methane catalys is relatively small, approximately 30% of that of standard bearing steel, compared with metallic materials, the thermal conductivity of silicon nitride ceramics is poorer. Therefore, ceramic bearings generate less heat during operation, which can extend the service life of the grease.

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