High-temperature lubricating oil detection method (lubricating oil high temperature and high shear index)
The heat resistance temperature of high-temperature lubricating oil varies depending on its type and brand, usually between 200°C and 300°C. This oil is often used in high-temperature industrial environments, such as steel manufacturing, metal processing, automobile manufacturing and oil refining. In steel manufacturing, high-temperature lubricating oil is used for equipment such as rolling mills, high-temperature ovens and steelmaking furnaces. In automobile manufacturing, engine parts and transmission systems also require high-temperature lubricating oil to ensure smooth operation at high temperatures. In addition, in the oil refining industry, high-temperature lubricating oil is used for high-temperature and high-pressure equipment such as compressors and oil refining furnaces. These industries and equipment require lubricating oils that can withstand high-temperature environments to ensure the normal operation and life of the equipment.
I. What are the high-temperature lubricating oil detection methods?
1. Viscosity test
Viscosity at high temperature is an important indicator for evaluating lubricating oil performance. Commonly used test methods include using a viscometer to measure the fluidity of the oil under high temperature conditions.
2. Oxidation stability test
Oxidation stability test can evaluate the stability of lubricating oil at high temperatures. For example, by simulating oxidation under high temperature conditions, it is possible to detect whether the oil will deteriorate under such conditions.
3. Flash point test
The flash point refers to the temperature at which the lubricant begins to release flammable vapors at high temperatures. Testing the flash point of lubricants can assess their safety at high temperatures.
4. Oil quality analysis
The oil samples are sent to the laboratory for analysis, including wear particle detection, acid value, base value, moisture content, metal element content and other indicators to assess the condition and service life of the oil at high temperatures.
5. Infrared spectroscopy analysis
Infrared spectroscopy can be used to detect the chemical composition and possible contaminants in the oil to determine whether the oil has changed or contaminated at high temperatures.
6. Volatility loss test
By simulating the volatility under high temperature conditions, it is possible to test whether the oil is easy to volatilize at high temperatures.
II. Evaluation indicators of high temperature performance of grease
1. Oxidation stability
Grease may oxidize and lose its performance due to contact with air at high temperatures. Testing the oxidation stability of grease can evaluate its stability and life in high temperature environments.
2. Dropping Point
The dropping point refers to the temperature at which grease begins to flow at high temperatures. It reflects the flow properties of grease under high temperature conditions.
3. High temperature extreme pressure performance
Under high temperature and high load conditions, grease needs to maintain protection and lubrication of metal surfaces. Evaluating the extreme pressure performance of grease can understand its ability to protect mechanical parts under high temperature environments.
4. Anti-corrosion performance
Grease should have good anti-corrosion performance in high temperature environments to protect mechanical parts from corrosion and oxidation.
5. Mechanical stability
Grease should have good mechanical stability under high temperature conditions to maintain its viscosity and lubrication properties, and not easily decompose or fail.
6. Dropping Point
The dropping point of grease is an indicator of the thermal stability of sodium fatty acids or other additives under high temperature conditions. The dropping point refers to the temperature at which grease drips from a conical container during heating. This indicates the temperature at which grease begins to soften, flow or fail at high temperatures.
The evaluation of these indicators can be completed through laboratory testing, performance data provided by manufacturers, and observation and use under actual working conditions. These high temperature performance indicators need to be considered when selecting grease for specific applications and requirements.
III. Lubricant high temperature and high shear indicators
When evaluating the performance of lubricants under high temperature and high shear conditions, some important indicators include.
1. Viscosity Index (VI)
The viscosity index is an indicator for evaluating the degree of viscosity change of lubricants at different temperatures. A high viscosity index means that under high temperature conditions, the viscosity of the lubricant changes less and maintains a relatively stable lubrication performance.
2. Shear stability
The stability of lubricants under high temperature and high shear conditions is very important. At high temperatures, the shear stability of the oil indicates whether it can maintain a stable lubricating film when it moves at high speed between mechanical parts.
3. Oxidation stability
Under high temperature and high shear conditions, lubricants are susceptible to oxidation. The oxidation stability index evaluates the anti-oxidation ability of lubricants in this environment and whether they can maintain stability between mechanical parts.
4. Extreme pressure performance
Under high temperature and high shear conditions, the extreme pressure performance of lubricating oil is an important indicator used to evaluate its ability to protect metal surfaces under heavy load and high speed conditions.
5. Shear stability
Under high temperature, lubricating oil needs to maintain the stability of its molecular structure to ensure that it is not easy to decompose or fail under high shear conditions.
These indicators can be evaluated through laboratory testing, performance data provided by manufacturers, and observation and use under actual working conditions. Different types of mechanical equipment and working environments may require specific high temperature and high shear performance indicators of lubricating oil.
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