Areas of babbitt and babbitt alloy use

Among widely used materials there are often those that an ordinary consumer may never have heard of. One of these materials is babbitt, a metal alloy based on lead or tin with a small amount of alloying substances. Both in industry and in everyday life it occupies an important place, which determines its unique areas and fields of application.

Babbitt Characteristics

Babbitt is a metal alloy based on tin or lead in different proportions. Babbitt is an anti-friction material. This means that it has an extremely low coefficient of friction and is therefore widely used for stabilization under high loads.

Metals such as copper, antimony, cadmium, sodium, arsenic and some others are used as alloying substances. It has a low melting temperature, from 280 °C to 400 °C depending on the alloy components. To understand the technical characteristics of babbitt, it is necessary to consider its types and grades.

Types and Grades of Babbitt

All used babbitt is divided into types and grades. The main types are lead, tin and calcium babbitt. The names correspond to the metal that predominates in the alloy. Lead babbitt, although not elastic, withstands high temperatures well, which is why it is widely used as an engine component.

Tin babbitt is characterized by greater resistance to external effects and corrosion, and it is also more plastic. However, this also results in its relatively high cost. Calcium babbitt is the most affordable type because of its low cost, but it should be considered that it is susceptible to corrosion and oxidation, so it wears out quickly.

Babbitt is also divided into grades for convenient use in industry. The most common are B16, based on lead, B83, based on tin, and SOS6, calcium-based. The numbers indicate the percentage share of the main metal in the alloy.

Areas and Fields of Application

Because babbitt has unique technical characteristics, it is actively used in industry. Its areas of application are limited to only a few fields where it is simply irreplaceable. The main areas and fields of babbitt use are:

• bearing production. A thin babbitt layer is formed at the base of the bearing. If the bearing is exposed to high temperatures, tin babbitt is used; if durability is the priority, lead babbitt is used. It is important to know that the thinner the layer of this alloy, the longer the bearing service life will be;

• heavy engineering. In almost all machines of metallurgy and mining industry it is used in pistons, bearings and other moving structures. Calcium babbitt is widely used in easily replaceable parts because of its low cost;

• automotive industry. Babbitt is an indispensable component of diesel engines in cars and agricultural machinery; lead babbitt is used because of its relative resistance to high temperatures. It is also used in moving assemblies of passenger and freight railway cars.

Babbitt is a material with unique properties. Throughout its one-and-a-half-century history, it has not lost its relevance and importance in mechanics. This material has both advantages and disadvantages, but proper use ensures long and stable operation of a mechanical structure.