Babbitt wire, tin-based and lead-based bearing alloys have good wear resistance. It was invented by American Babbitt. Because it is white, it is also called white metal wire, oojin.

 

Babbitt wire is a low melting point bearing alloy with hard particles distributed on a soft substrate. There are three series: tin-based, lead-based and cadmium-based. The representative components (mass fraction) of tin-based Babbitt wire are antimony 3%~15%, copper 2%~6%, cadmium <1%, tin dross.

 

Babbitt wire

 

Introduction of melting point

 

The solid point temperature of ZSnSb11Cu6 cast tin-based babbitt alloy wire is 240℃, and the liquid point temperature is 370℃. The service temperature of ZSnSb11Cu6 cast tin-based babbitt alloy wire should not exceed 100℃. The friction coefficient is 0.005 in the oil state and 0.28 in the oil-free state.

 

 

Basic Features

 

Babbitt wire (including tin-based bearing alloy and lead-based bearing alloy) is the most famous bearing material. Babbitt wire and lead-based bearing alloy have good anti-friction properties. It was invented by American Babbitt, named for its white color, and is also called white metal wire. Its application can be traced back to the industrial revolution. Tin-based babbitt wire and lead-based babbitt wire are materials suitable for rotation relative to low-hardness shafts. Compared with other bearing materials, it has better adaptability and indentation, and is widely used in large-scale marine diesel engines, steam turbines, alternators and other mining machinery and large-scale rotating machinery.

 

Its microstructure is characterized by the uniform distribution of hard particles on the soft matrix. The soft matrix makes the babbitt alloy wire have good embedding, compliance and seizure resistance; after running-in, the soft matrix is ​​concave and the hard particles are convex, so that the sliding surface gap is small, and it becomes an oil storage space and lubrication. The oil channel helps reduce friction. The convex hard particles play a supporting role and are beneficial to load-bearing.

 

Basic ingredients

 

The main alloys are tin, lead, antimony, copper, antimony and copper are used to improve the strength and hardness of the alloy. The babbitt alloy wire has evenly distributed hard particles on the soft phase matrix, and has good embedding, flexibility and seizure resistance. After running-in, the soft matrix is ​​concave, and the hard particles are convex, so that the sliding surface gap is small, which becomes the oil storage space and lubricating oil passage, which is beneficial to reduce friction. The convex hard particles play a supporting role, which is beneficial to reduce friction and is beneficial to load. In addition to making sliding bearings, babbitt alloy wire is often sprayed on the steel substrate to make bearing bushes due to its soft texture and low strength. Babbitt wire can be divided into tin-based alloy (see tin alloy) and lead-based alloy. The latter contains 10%-20% antimony and 5%-15% tin. In order to prevent component segregation and refine grains, a small amount of arsenic is often added. The strength, hardness and corrosion resistance of lead-based alloys are lower than tin-based alloys.

 

Basic use

 

Babbitt metal wire is mainly used for bushings, bearings, bushings and bushings of large mechanical spindles. For example: cement machinery, steel machinery, chemical machinery, paper machinery, petroleum machinery, ship machinery, compressor machinery, coal mining machinery, mineral processing equipment, etc., can also be used on large machine tools instead of brass, and the effect is also very good.

 

In addition to making sliding bearings, babbitt alloy wire is often sprayed on the steel substrate to make bearing bushes due to its soft texture and low strength. In order to prevent the separation and refinement of crystal grains, a small amount of arsenic is usually added.