What kind of Slew bearings can withstand high temperature?

In the field of modern industry, numerous production processes involve high-temperature environments. In the high-temperature scenarios, ordinary bearings struggle to function properly. Thus, bearings capable of withstanding high temperatures have emerged. These bearings enable equipment to operate stably in high-temperature environments.

What are High-Temperature Slew Bearings?

The primary characteristic of High-Temperature Slew Bearings is their excellent high-temperature resistance. They can maintain structural stability and mechanical properties for extended periods in high-temperature environments. Their materials are usually special alloys, such as alloy steels containing elements like chromium, molybdenum, and vanadium. These alloys can form a dense oxide film at high temperatures, preventing further oxidation and maintaining material strength. For example, at a high temperature of 1000°C, some nickel-based alloy bearing materials can still maintain high hardness and strength, meeting the operational requirements of equipment.

High-Temperature Slew Bearings also require a reliable lubrication system. Ordinary lubricating greases are prone to evaporation and carbonization at high temperatures and cannot provide lubrication. High-Temperature Slew Bearings often use high-temperature-resistant solid lubricants, such as molybdenum disulfide and graphite. These can form a lubricating film at high temperatures, reducing the coefficient of friction. Some High-Temperature Slew Bearings are also equipped with a forced lubrication system, which uses circulating and cooled lubricating oil to dissipate heat and ensure lubrication effectiveness.

Main Types and Characteristics

Ceramic Bearings

Ceramic bearings are outstanding among High-Temperature Slew Bearings. Commonly used ceramic materials include silicon nitride and silicon carbide. These ceramic materials have a low density, approximately one-third that of metals, which can effectively reduce the weight of equipment. They have extremely high hardness, with the hardness of silicon nitride ceramics reaching 2000 – 3000 HV, much higher than that of metals, and excellent wear resistance. In high-temperature environments, ceramic bearings have good chemical stability, are not prone to reacting with other substances, and have strong oxidation resistance. For example, in the high-temperature furnace equipment of the glass manufacturing industry, ceramic bearings can operate stably at around 1500°C, reducing maintenance costs and improving production efficiency. However, ceramic bearings are relatively brittle, prone to damage in impact environments, and have high processing difficulty and costs.

High-Temperature Alloy Bearings

High-temperature alloy bearings use nickel-based and cobalt-based alloys as their main materials. These alloys contain multiple alloying elements such as chromium, molybdenum, and tungsten. They have good oxidation resistance and thermal strength at high temperatures and can withstand high temperatures and heavy loads. Nickel-based alloy bearings can operate normally at 800 – 1000°C and are commonly used in critical components such as aircraft engines and gas turbines. High-temperature alloy bearings have good strength and toughness and can adapt to complex working conditions. However, the alloy composition is complex, resulting in high manufacturing costs.

Self-Lubricating Bearings

Self-lubricating bearings achieve self-lubrication by adding solid lubricants to the metal matrix. Commonly used solid lubricants include molybdenum disulfide and polytetrafluoroethylene. In high-temperature environments, the solid lubricant in this type of bearing can slowly release and form a lubricating film on the friction surface, reducing friction and wear. In the continuous casting equipment of the metallurgical industry, self-lubricating bearings can operate stably in high-temperature, high-load, and difficult-to-lubricate environments, reducing maintenance frequency and improving equipment operation reliability. However, the self-lubricating performance of self-lubricating bearings weakens over time, and lubricants need to be replaced or replenished regularly.

Application Fields

In the aerospace field, parts such as engine combustion chambers and turbines are exposed to extremely high temperatures. The performance of High-Temperature Slew Bearings directly affects the safety and performance of aircraft. For example, High-Temperature Slew Bearings in aircraft engines need to operate at temperatures above 1200°C, withstanding high speeds and heavy loads. Ceramic bearings and high-temperature alloy bearings meet these requirements with their excellent performance, ensuring the stable operation of engines.

In the metallurgical industry, High-Temperature Slew Bearings are widely used in various heating furnaces, rolling mills, and other equipment. During the steel rolling process, the roll bearings need to withstand huge pressure and friction at 500 – 800°C. High-temperature alloy bearings and self-lubricating bearings can adapt to such harsh working conditions, ensuring the continuity of steel rolling production and product quality.

Equipment such as furnaces and annealing furnaces in the glass manufacturing industry also rely on High-Temperature Slew Bearings. In the stirrers and discharge devices of glass furnaces, ceramic bearings can operate stably near high-temperature glass melts at 1400 – 1600°C, preventing metal impurities from contaminating the glass and improving the quality and production efficiency of glass products.

With the continuous development of industrial technology, High-Temperature Slew Bearings also have new application requirements in emerging fields such as new energy and electronic manufacturing. In the concentrator tracking devices of solar thermal power generation systems, High-Temperature Slew Bearings need to operate for long periods in high-temperature and harsh outdoor environments. In high-temperature process equipment for semiconductor manufacturing, High-Temperature Slew Bearings must meet the requirements of high precision and low pollution.

High-Temperature Slew Bearings are indispensable in modern industry. Different types of High-Temperature Slew Bearings have their respective advantages and disadvantages. In practical applications, the appropriate bearing type needs to be selected according to specific working conditions and requirements. With the continuous progress of materials science, manufacturing processes, and lubrication technologies, the performance of High-Temperature Slew Bearings will continue to improve, and their application fields will be further expanded, providing more reliable support for industrial production in high-temperature environments.

Price of High-Temperature Slew Bearings

The price of High-Temperature Slew Bearings are affected by multiple factors. The material is a key factor. High-performance, high-temperature-resistant special alloy materials have high costs, resulting in high prices. In terms of accuracy levels, high-precision High-Temperature Slew Bearings have complex manufacturing processes and are more expensive than ordinary-precision ones. Regarding specifications and dimensions, large-sized or special-specification High-Temperature Slew Bearings are difficult to produce, and their prices will increase accordingly. Market supply and demand relationships also affect prices. When supply is in short supply, prices rise, and when there is an oversupply, prices fall.

Supplier of High-Temperature Slew Bearings

Ldb bearing company has always stood out since its establishment. It is rooted in Luoyang, Henan, a fertile ground for the bearing industry. With its professional design and R&D capabilities, it has created numerous high-quality products. The company offers a wide range of product specifications, and both standard and non-standard products showcase exquisite craftsmanship. From the incoming inspection of raw materials to the output of finished products, strict process control and quality management are implemented at every step.