Heat-resistant grease is designed to protect various mechanisms during operation at high temperature values. It prevents wear of parts for a long time and is effective at a temperature of at least 150 degrees. Most of the equipment in industrial plants and enterprises does not require the use of such materials, so they are available in limited quantities and, as a rule, by order.
Description
Materials differ significantly from conventional lubricants, primarily the raw materials used. It is much more expensive and includes special additives necessary to increase heat resistance, and synthetic thickeners with an oil base. This is due to the fact that conventional lubricants are ineffective in such conditions and are consumed too quickly.
Types
There are many varieties, among which are the following:
- Heat-resistant sodium grease over time is becoming less and less popular, as it is inferior in characteristics to modern options that can withstand a wider temperature range.
- Calcium complex materials are reasonably priced and widely distributed. They are made on the basis of calcium soaps obtained from fatty acids, contain thickeners and disulfide, due to which they have increased adhesion ability and antifriction characteristics.
- Silica gel heat-resistant grease for bearings is suitable for various equipment. It is cheaper than synthetic analogues due to the oil base.
- Pigment compositions are made from special thickeners and are ideally suited for bearings of electric machines operating at high speed.
- Polymer materials have distinctive anti-friction characteristics and are made from materials such as fluoroplastic and polyurethane.
- Heat-resistant graphite grease is designed for low-speed elements and retains its previous characteristics at temperatures above 350 degrees. Distinctive features are minimal evaporation, excellent extreme pressure and technical characteristics.
Today, there are more than 30 brands of heat-resistant lubricants that are constantly being improved and have replaced obsolete products.
Scope of use
Heat-resistant silicone grease, resistant to heat, is indispensable in the enterprises of the ceramic, baking, paper and energy industries, it also provides bearings in the elements of vehicles and agricultural vehicles, tracked vehicles. It is possible to use in mechanisms and components that are constantly exposed to moisture due to high waterproof characteristics. Without these materials, it is impossible to imagine the work of locks of drying chambers, kilns, conveyor belts, fan bearings and pumps.
Due to the use of the compositions, the load on the friction surfaces is reduced, which increases the period of operation. At the same time, the presence of special additives and viscosity characteristics ensures a minimum consumption. To maintain the previous characteristics, it is undesirable to mix compositions of various types, since each of them has a specific purpose and properties.
Heat-resistant grease for bearings
The material is divided by area of use, ingredients and consistency. The structure may be solid, plastic or liquid. The last two options are colloidal compositions containing the dispersed phase and various additives. Plastic materials find their application in cables with a large number of cores, screw gears, joints and various bearings. When using them, several points should be taken into account that determine the efficiency of operation:
- Ability to mix multiple materials.
- Combination of lubricants and service materials.
- Application conditions (pace, load, temperature range).
Solid high-temperature grease for bearings acquires its properties after evaporation of the solvent and has a minimum value of dry friction. It consists of binders (resins), a thickener and a solvent. Also, carbon and graphite may be included.
Composition
Composition materials are classified into several types:
- Inorganic lubricants are made from highly dispersed materials that are stable when exposed to any temperature. These include asbestos, graphite and silica gel materials.
- Heat-resistant soap grease contains salts of carboxylic acids and is further divided into complex and simple, depending on the soap used. A separate variety is the material on a mixed basis. The soap anions used determine the type of material that can be fatty or synthetic.
- Hydrocarbon-based formulations contain thickeners in the form of synthetic and natural waxes, paraffin and ceresin.
- Heat resistant organic grease It is made of dispersed heat-resistant materials and can have a carbon black, pigment and polymer base.
Destination classification
There are many areas of application of the compositions, in order to simplify the choice of a particular option, they were divided into several types according to their purpose:
- Cable cars provide corrosion protection and reduce wear.
- Sealing can achieve the necessary sealing on movable and threaded joints, simplify the work with fittings and close the gaps.
- Preservation prevent the formation of corrosion on steel elements during storage, transportation and operation.
- Antifriction reduces the friction of adjacent elements and overall wear.
The main purpose of bearings is the formation of movement in systems and mechanisms. But without proper care, it is impossible to ensure quality work and a long service life. High-temperature grease for bearings is an indispensable material for full functioning. A similar composition is designed specifically for use at high temperatures. When used in other conditions, it begins to thicken and crystallize.
How to choose
When choosing, it is necessary to take into account the loads attributable to the mechanism, the materials used and the speed of rotation of the elements. The lubricant structure becomes too fluid when the speed limit is exceeded. Because of this, it spreads around the edges, and excessive friction occurs on the dry interior of the part.
The speed limit of various mechanisms varies widely. Synthetic materials are optimally suited for units operating at high speed. Environmental factors, in particular exposure to steam, acids and dust, must also be considered. To work under conditions of constant influence of solvents and acids, more stable formulations are required.
What you need to know
The functions of lubricants include not only minimizing friction between adjacent structural elements and the formation of a protective layer. They prevent the ingress of pollution from the environment, the formation of corrosion, provide cooling of the structure and heat distribution. This increases the life of the equipment and reduces the degree of damage during excessive loads.
Rolling bearings
This variety is indispensable for many types of equipment. Solid, liquid and plastic heat-resistant greases are suitable for them, which are selected individually, depending on the functional purpose of the mechanism. Also, not only the main criteria should be taken into account, but also the possibility of application in the food industry and requirements for the purity of the unit. In addition to the main functions, they must be environmentally friendly and provide a minimum level of noise during operation.
Despite the fact that various options with any consistency can be used, liquid lubricant is most preferable, due to characteristics such as a high degree of removal of worn-out items of equipment that appear during friction, and heat distribution. The oil structure has excellent penetrating properties, but is less economical due to possible leakage of the composition. Plastic and synthetic heat-resistant lubricants are deprived of this drawback. They are more economical and in their characteristics are not inferior to oil analogues.