Effective raw materials for mechanical products – carbon graphite

Carbon graphite is an excellent lubricating material, especially its dispersion systems and composite materials have a wide range of application values in the fields of transportation power, manufacturing and high technology. So that carbon graphite products have excellent high temperature resistance, self-lubricating properties, low friction coefficient, wear resistance, chemical medium corrosion resistance and good thermal conductivity, small thermal expansion coefficient, adaptability to high and low temperature alternating performance and Physical and mechanical properties of materials.

Due to the excellent material properties, and the raw materials for manufacturing are mostly derived from the by-products of oil refining and chemicals – carbon graphite, which are widely used in various industries, the manufacturing of carbon graphite products has developed rapidly in my country.

Coarse structure carbon graphite products

Usually 2-10mm particle size coke or anthracite is used as the skeleton structure, and the voids are filled with 60-70% fine powder. The larger the size of the product, the coarser the particle size of the selected aggregate, which is usually extruded or vibrated with a uniformly mixed hot paste, and the surface of the finished product is rough. Products produced by the same process have lower strength and wider pore size distribution than those with fine particle structure. The raw materials used are low, the binder is less, the roasting is easy, the graphitization and heat treatment process is not easy to crack, and it is not suitable for high-quality impermeable mechanical sealing products.

Ultrafine structure carbon graphite products

Usually, 4-10μm grade superfine carbon powder is used as the main raw material, which is produced by superfine powder grinding machine powder, isostatic pressing, and special technology or advanced roasting kiln heat treatment. The distinctive feature of the product is that the internal structure is finer, more uniform, and the strength is high. It can process high-performance mechanical seal products with high surface precision and smoothness that are resistant to friction and wear, but the production cost is high. It is a military and aerospace product and other high-performance mechanical seals materials required.

Potential problems with carbon graphite

Some potential problems may arise, The following answers are explained by our experts.

①The carbon graphite substrate has rough particle size, high porosity, uneven distribution, and different pore sizes. When re-inspecting the 0.6MPa air pressure test, each batch has different degrees of leakage, and the failure rate is more than 30%. Some products have flexural and compressive strengths that do not meet the mechanical performance requirements specified in the technical standards, and some have friction coefficients higher than those specified in the standards, with large fluctuations in hardness and unbalanced bulk density. Therefore, it adds a lot of trouble to the high-quality manufacturing of carbon-graphite products. If you are not careful during handling, processing and installation, it will crack or break.

②For users who require high-performance equipment, to ensure the service life of the machinery, some carbon graphite products are difficult to meet this requirement. The problem reflected in the use site is that the hardness is low and the wear resistance is high, and the wear resistance is high although the hardness is high. Some of them are better, but they are too brittle. Some of them break into irregular pieces without much wear. The hardness stability is poor and the service life fluctuates greatly. The use of Franli’s carbon graphite products greatly reduces the crushing phenomenon caused by mechanical vibration and axial force, and customers report that the use effect is good.

Carbon graphite material can not only significantly improve the compressive strength, flexural strength and modulus of mechanical products, reduce friction coefficient, but also greatly improve the friction and wear performance and impact strength of carbon graphite, which can meet the use of products under more complex working conditions. Require. Franli Factory has made certain technological progress in the research of carbon graphite, in order to meet the needs of the rapid development of the national economy.

In order to guide carbon graphite, the Franli factory strictly controls the raw material particle size, batching, mixing, pressing, roasting, impregnation and other process links, strengthens mechanical property testing, updates industry technical standards, and provides reasonable pricing to improve the application of carbon graphite. quality and promote the rapid development of the national economy.