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　　Silicon carbide ceramic raw materials are quite familiar to everyone and are increasingly used in industrial production. So, what are the advantages of using silicon carbide ceramic raw materials for hydraulic seals, and what are the key application points of carbon-carbon composite hydraulic seals? Today, let's explore together!

　　I. Advantages of Carbon-Carbon Composite Hydraulic Seals Carbon-carbon composites have characteristics such as heat resistance, corrosion resistance, thermal shock resistance, and no deformation during long-term use. The application temperature is 1380℃, and the tensile strength at 1400℃ is the same as the tensile strength at room temperature. Therefore, carbon-carbon composites can be used in high-temperature operating conditions of mechanical seals. High temperatures easily cause changes in the material properties of the friction pair, causing the sealing bore to deform and reducing strength, thus reducing the service life of the mechanical seal. Therefore, the thermal deformation, high-temperature compressive strength, and wear resistance of high-temperature rubber seals are crucial considerations when selecting rubber seals. Carbon-carbon composites have the advantages of low relative density, good corrosion resistance and heat transfer properties, low friction resistance when matched with high-purity graphite or self-matched, and extremely high strength, making them ideal as seal ring materials for mechanical seals. Therefore, they are widely used in mechanical seals operating under high PV values, high temperatures, corrosive substances, and substances containing solid particles.

　　At present, nearly half of the commonly used mechanical seal bore materials in industrial production use carbon-carbon composites. There are many methods for producing carbon-carbon composites, and their properties vary. According to different production methods, there are the following types: overheated steam calcined carbon-carbon composites, reaction calcined carbon-carbon composites, pressed and calcined carbon-carbon composites, chemical vapor deposition carbon-carbon composites, and chemical liquid phase deposition carbon-carbon composites. As mechanical rubber seals, the first three are more widely used. A mechanical seal is a radial seal device that relies on a damper to provide a sealing pair moment, and achieves sealing by clamping the sealing pair under the combined action of the medium and damper pressure. The application of carbon-carbon composite hydraulic seals is becoming increasingly widespread.

　　II. Key Application Points of Carbon-Carbon Composite Hydraulic Seals

　　Carbon-carbon composite hydraulic seals are materials or components that prevent leakage of liquids or solid particles between adjacent bonded surfaces, and prevent external debris such as dust and moisture from entering equipment and machinery components.

　　1. Select suitable hydraulic seal materials and lubricants, as well as compatibility with the operating temperature and oil.

　　2. High precision (coaxiality) of the geometry of the relatively sliding parts with the hydraulic seal, good material (such as hard chromium plating), and fine surface roughness can extend the service life.

　　① For skeleton seals used on hydraulic pumps and motor shafts, not only is the surface roughness of the sliding surface required to be within Ra 0.25m, but hard chromium plating is also required on its surface. During actual use, it is also necessary to appropriately adjust the axial spring force of the skeleton seal lip according to the specific situation, making it appropriately tight. During installation, an installation sleeve or thin gasket should also be used to protect the sealing ring to prevent the lip from rolling up and warping, causing the spring to slip off.

　　② The inner surface of the hydraulic cylinder is commonly processed by extrusion, which not only improves the surface roughness but also cold works the surface, which helps increase the service life of the sealing ring. In addition, the working pressure, length, and type of the sliding surface also have a significant impact on the service life. Therefore, the "regular inspection" time should be determined based on these criteria.

　　③ Requires good surface lubrication and prevention of debris intrusion. Use hydraulic oil that meets the required cleanliness level and proper installation methods. The above detailed content is what I want to share with you today about the detailed content of "Advantages and Key Application Points of Carbon-Carbon Composite Hydraulic Seals", hoping it can help you!