China supply babbit alloy metal Babbitt alloy

Product Overview

Description

Babbitt metal, a low melting point bearing alloy with a hard particle phase distributed on a soft substrate. There

are three series of tin base, lead base and cadmium base. The representative composition (mass fraction) of tin-

based babies is:  3%~15%, copper 2%~6%, cadmium <1%, tin balance. Tin-based and lead-based bearing

alloys with antifriction properties are named after the American Babbitt invention, because it is white, also known as white alloy, Wujin.

The solid phase temperature of the cast tin-based Babbitt ZSnSb11Cu6 is 240 ° C, the liquidus temperature is 370 ° C, the maximum use temperature must not exceed 100 ° C, the friction coefficient is 0.005 when there is oil, and 0.28 when there is no oil.

Characteristics

Babbitt alloys (including tin-based bearing alloys and lead-based bearing alloys) are the most well-known bearing materials, tin-based and lead-based bearing alloys with antifriction properties. Named after the invention of American Babbitt, it is white, also known as white alloy, and its application can be traced back to the era of industrial revolution. Tin-based babbitt and lead-based babbitt with anti-friction properties are the only materials that are suitable for rotation relative to low-hardness shafts. They have better adaptability and press-fit properties compared to other bearing materials and are widely used in large scales. Marine diesel engines, turbines, alternators, and other mining machinery and large rotating machinery.

 

The main alloy components are tin, lead, antimony and copper. Niobium and copper are used to increase the strength and hardness of the alloy. The microstructure of the Babbitt alloy is characterized by a uniform distribution of hard phase particles on the soft phase matrix. The soft phase matrix gives the alloy a very good adhesion, compliance and seizure resistance, and after running in, the soft matrix is concave. The hard point is convex, so that a slight gap is formed between the sliding surfaces, which becomes an oil storage space and a lubricating oil passage, which is advantageous for reducing friction; the convex hard point plays a supporting role and is favorable for carrying. Babbitt alloy is divided into tin base (see tin alloy) and lead-based alloy. The latter contains 10% to 20% bismuth and 5% to 15% tin. In order to prevent segregation and refine grains, a small amount of arsenic is often added. Lead-based alloys have lower strength and hardness than tin-based alloys and poor corrosion resistance.

 

The characteristic of the structure is that the hard phase particles are evenly distributed on the soft phase matrix, and the soft phase matrix makes the Babbitt alloy have very good adhesion, compliance and seizure resistance.
use

Babbitt alloy is mainly used for bushings, bearings, bushings and bushings of large mechanical spindles. Such as: cement machinery, steel machinery, chemical machinery, paper machinery, petroleum machinery, ship machinery, compression machinery, coal mining machinery, mineral processing equipment, etc., can also be used on large machine tools to replace brass, the effect is also very good.

 

In addition to the manufacture of plain bearings, the Babbitt alloy is often used for the production of bushings by spraying its wire or powder on a substrate such as steel because of its soft texture and low strength. In order to prevent segregation of components and refine grains, a small amount of arsenic is often added.

 

According to national standards, babbitt alloys can be classified into tin-based alloys and lead-based alloys. Lead-based alloys have lower strength and hardness than tin-based alloys and poor corrosion resistance.

 

Therefore, when customers use babbitt, tin-based alloys are usually used. The commonly used grades are ZChSnSb11-6, ZChSnSb8-4, ZChSnSb8-8 and so on. Although the performance of lead-based alloys is not as good as that of tin-based alloys, many customers still choose to use them because they are economical to use, and their commonly used grades are ZChPbSb16-16-2, ZChPbSb1-16-1 and so on.