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Solid Bronze Bushing | Shop Online

Solid bronze bushings are available in metric sizes as straight or flanged bushings at Viiplus.

Aerospace bearing

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Solid lubricants for the aerospace industry

Solid lubricants also function at extreme temperatures where the viscosity of oils and greases is too high or low to be effective. These lubricants are used in cryogenic liquid hydrogen–oxygen rocket fuel systems. Turbopumps force the pressurized liquid fuel components into the engine where an electrical spark ignites them. Finding a lubricant that will work with the pump bearings is challenging.  Liquid lubricants will freeze, and hydrocarbon lubricants can explode in this type of liquid fuel environment. Thus, the bearing cages and retainers use solid materials that form lubricating transfer films to the rings and balls that they slide against.

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The Mechanism Of Solid lubricating material

The main purpose of solid lubrication is to adhere the solid lubricant on the friction surface to form a solid lubricating film by plating, coating, and other methods. During friction, a transfer film is formed on the surface of the dual material, so that the friction occurs inside the lubricant, thereby reducing friction and wear. . On the one hand, the lubricating film can prevent direct contact between the surfaces of the paired materials, and on the other hand, it can reduce the shear strength of the contacting thin layer, thereby significantly reducing the friction coefficient.

oil free slide plate
oil free slide plate

Application of lubricants in machining

In pressure processing, the primary role of lubricants should be lubrication. Sometimes, in order to improve the quality of processing or improve the efficiency of production processing, it is necessary to increase the temperature during processing. However, high temperature will put higher requirements on the hardness and strength of the tool, and adhesion wear and occlusion are prone to occur between the tool and the blank. At this time, the lubrication and cooling of the press working are very important. In the cutting process, the friction in the cutting will generate a lot of heat, resulting in an increase in the cutting temperature, which can sometimes be as high as 1 000 °C or more. In order to ensure the quality of cutting, lubrication and cooling are equally important at this time. Solid lubricants used in mechanical processing are generally added as additives to oil-based or water-based lubricating coolants. Commonly used solid additives are graphite, bentonite, kaolin, calcium carbonate, sodium silicate, borate, MoS2, glass and lead, etc.

Solid Lubricanting Material – Find Inlaid Solid Lubricating bearing

Inlaid solid lubricating bearing takes metal material as the base, and holes in the base (brass, tin bronze, aluminum bronze, cast iron, GCr15, and other alloy materials) are arranged in an orderly and appropriate size, and then embed oily graphite, PTFE, molybdenum disulfide particles as solid lubricating material. When the bearing works under oil-free lubrication conditions, due to the effect of frictional heat, the solid lubricating material will gradually be transferred to the working surface of the friction pair, thereby reducing the friction factor.

oilless bushing

Properties of solid lubricants

  • 1. Easy shearability
    One of the purposes of using a solid lubricant is to reduce friction, so it must be easy to shear, that is to say, the solid lubricant must have a slip surface that is easy to slide.
  • 2. Easy to adhere
    If the solid lubricant located on the friction surface is sheared, it will be scattered outside of the friction system as a fine abrasive, and the result is that its lubricating effect disappears. If the solid lubricant powder which becomes fine in each shear is excluded continuously, the life of solid lubricant will end soon; to maintain the performance of solid lubricant for a long time, the solid lubricant must have the property of easy adhesion to the anti-friction surface, and be able to shear sufficiently until the lubricating effect disappears。
  • 3. Wide temperature range

    The nature of solid lubricant does not change in a wide temperature range, so it can be applied to a wider range of applications.

  • 4. Small aging change, non-toxic and non-harmful

    Lubricity has the weakness of disappearing with time, so it is difficult to use for a long time, the chance of failure is small and the use time is long. Likewise, causing the failure of the lubricating material change is also a problem for any kind of lubricating material. No matter how good its lubricating characteristic is, as long as it is corrosive to the bearing and related parts, it cannot be used as a lubricant. In addition, solid lubricant also requires non-toxic and non-hazardous.

flange graphite plugged bronze bushing

Advantages Of Solid Lubricants

In addition to providing reduced friction and wear, solid lubricants offer the advantage of permanent lubrication with no leakages. They generate low amounts of heat and offer low startup torque.

Solid lubricants are ideal for use in the food industry, as they are NSF certified for food processing. This type of lubrication will keep contaminants out, and it is compatible with acids and other corrosive chemicals. As such, it functions well in wash-down applications.

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VIIPLUS Graphite Bearings & Bushings

Viiplus is proud to offer self-lubricating bushings and bearings in a variety of material grades to meet the specific need of each client. We offer not only standard replacement styles but also offer custom-designed parts for specific operating needs. Our parts selection ranges from simple sleeve bushings to more complex styles that can incorporate notches, grooves, or metal reinforced sleeves.

Our high-quality plugged materials are made from graphite materials because they offer superior strength, hardness, and wear-resistant that carbon is known for as well as the lubricity that graphite is known for. Graphite solid lubricants are optimal because they are strong, thermally stable, and inert in most chemical and corrosive applications. Where even better wear performance, and increased heat resistant or impervious materials are desired, performance properties can be enhanced by impregnating the carbon graphite with resins, metals, and oxidation inhibitors. We offer metal-backed carbon graphite bearings for use in extreme service needs. The metals we select will depend on need but should offer excellent corrosion resistance and thermal conductivity.

The way of inlaying solid lubricant

Most of the low-speed and heavy-load sliding bearings in the actual production area are in the state of boundary lubrication. At this time, the lubrication cannot establish a thick enough oil film to reduce friction and wear. The bearings often experience accidents such as shaft holding, serious wear and even burning of tiles, which seriously affects the normal production. Bearings operating at high temperatures are even worse. Grease can be used at most at 250 °C, so bearings operating above 250 °C are often dry friction. A class of metal damascene has been developed for this situation.
Body self-lubricating material sliding bearing, that is, the solid lubricant is embedded in the metal matrix. The solid lubricant embedded in this kind of bearing can repair and regenerate the lubricating film at any time, which can form effective lubrication.

There are three ways to metal inlay solid lubricants

  • a is the method of first drilling holes on the metal substrate and then burying the solid lubricant, referred to as the embedded type.
  • b is a certain shape of solid lubricant cast together with the base metal, referred to as casting mold.
  • c is the method of first dispersing the solid lubricant in the molten metal and then casting, referred to as the dispersion type.

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