Graphite lubricant mechanism structure

Graphite has a flaky crystal structure with good lubricating properties. And it also has good electrical conductivity, thermal conductivity, wear resistance, pressure resistance, temperature resistance (the temperature can be as high as 450 ℃) and chemical stability, so graphite is widely used in the machinery industry to make various lubricants.

Used as a lubricant, it is mainly to uniformly distribute graphite fine particles in water, oil or other media to form a stable colloidal substance. It can be directly applied to the parts that need lubrication by means of spinning, dipping or spraying. It can be added to various lubricants and used together. When it contacts the metal surface, it can not only form a firm lubricating film, but also improve the wetting performance of the metal surface to other lubricants, thereby maintaining long-term lubrication. In addition, because graphite exists as extremely fine particles, it can easily penetrate into closely fitting sliding or rotating parts to provide good lubrication.

Graphite lubricant mechanism

Graphite has a hexagonal crystal structure. Because the bonding force between the surfaces parallel to the foundation surface is weak, these crystals are easy to shear between the surfaces, that is, the friction force is small, and at the same time, it can support the load perpendicular to the foundation surface, so the bearing capacity is strong, and the friction coefficient is small. It has the best properties as a solid lubricant.

The friction and wear of graphite is dominated by adsorbed gas. The wear rate of graphite decreases with the increase of water vapor pressure. When the pressure increases to above 466Pa, blind damage cannot be observed, indicating that the lubricating properties of graphite are affected by adsorbed gas.

The reason why the wear characteristics of graphite depend on gas adsorption is that the surface energy of the graphite edge surface (side surface) is 100 times higher than that of the base surface, so the edge surface is easier to adhere to the bottom metal surface in vacuum than the base surface. Even if the tangential force increases, shear will not occur between the foundation surfaces that are easy to slip. This leads to an increase in the coefficient of friction and increased wear. The friction coefficient of graphite in vacuum is twice that in air, and the wear is even as high as 100 times.

If there is gas, the edge surface first adsorbs the gas and reaches saturation, then its adhesion to the metal surface occurs on the base surface, and under the action of shearing force, the slip between the base surfaces becomes easy.

The higher the crystallinity of graphite, the more it can protect the lubricated material from wear. In addition, the content of impurities must be controlled below 1%, otherwise significant abrasive wear will easily occur. However, this effect is actually different depending on the type of impurity.

Taking advantage of graphite's ability to easily absorb gas, fluorine, metals or metal compounds can be introduced between the layers to form interlayer compounds, or to form a honeycomb structure through electrolytic oxidation and reduction. Figure 2 is a graph showing the relationship between metals and metal chlorides on the life of the graphite intercalation compound coating film. As a substance introduced into the interlayer, metal chloride has a better effect than metal, and the more the amount of inclusion, the more obvious the effect. It can be seen that cobalt chloride (CoCl2) is the most effective way to improve the density-resistant life, which can extend the life to more than 5 times that of the original graphite. Such new materials can maintain good lubricating properties even under changing sliding conditions.

Overview of graphite lubricants:

A suspension of graphite powder dispersed in water, oil or solvent. It is often used as a lubricating release agent for metal thermoplastic pressure processing. As a thickener of grease, graphite can increase load-bearing capacity, wear resistance and heat resistance, and has good high-temperature adhesion.

Application of graphite lubricant

Graphite can be used as a lubricant, mainly by uniformly distributing graphite particles in water, oil or other media to form a stable colloid. It can be directly applied to the parts that need lubrication by spin coating, dip coating or spraying. It can be used together with various lubricants. It can not only form a strong lubricating film, but also improve the lubrication of the metal surface to other surfaces. The wetting properties of the agent, so as to maintain long-term lubrication. In addition, because graphite exists in very fine particles, it is easy to penetrate into the tightly fitting sliding or rotating parts, providing good lubrication.

Graphite lubricant price

The price of graphite powder graphite lubricant and dry graphite lubricant will vary randomly with the production cost, transportation cost, international situation, and the supply and demand of graphite powder graphite lubricant and dry graphite lubricant market. Tanki New Materials Co., Ltd. aims to help various industries and chemical wholesalers find high-quality, low-cost nanomaterials and chemicals by providing a full set of customized services. If you are looking for graphite powder graphite lubricant dry graphite lubricant, please contact free delivery inquiry to get the latest price Ø ˚F graphite lubricant.

Graphite lubricant supplier

As a global graphite powder graphite lubricant dry graphite lubricant supplier, Tanki New Materials Co., Ltd. has extensive experience in the performance, application and cost-effective manufacturing of advanced engineering materials. The company has successfully developed a series of powder materials (the best engine oil additives for nano-diamond, lithium stearate, nano-copper and nano-oil additives), high-purity targets, functional ceramics and structural devices, and provide OEM services.

Physical and Chemical Data of Graphite

Properties of Graphite