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What is tin-bismuth alloy?

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Update time : 2022-11-02 21:04:37
Tin-bismuth alloy is a kind of metal, which is relatively common in our daily life. Its name is called tin-bismuth alloy because its inventor is Babbitt in the United States, and its color is white, so it becomes a tin-bismuth alloy in combination.
Its melting point is relatively low. We all know that the melting point of iron can reach nearly 1,000 degrees, while the maximum temperature of tin-bismuth alloy cannot exceed 100 degrees Celsius when used.
Its most well-known use today is that it can be used as a bearing material. And its hardness is not as high as other metals, so if it is used as a bearing, it can be well adapted to other parts and can be pressed in better. Therefore, it is generally used for various types of generators and some large-scale machinery, such as machinery used in mining mines.
Of course, tin-bismuth alloy is soft and hard in structure. It has both a soft phase matrix and other metal components with relatively high hardness, such as copper and antimony, so it can better withstand weight when used. At the same time, it can ensure smooth operation. 
Low temperature tin alloy product performance
     Low-temperature tin alloys are alloys composed of tin-based and other elements. The most used alloys in tin alloys are tin-based bearing alloys and tin solders. The melting point of tin alloys is low, and the melting temperature of most tin alloys is between 183 and 370 °C, and some can be as low as 138 °C. Tin alloys have high thermal conductivity and low thermal expansion coefficient, and are resistant to atmospheric corrosion; but their strength is not high, and the tensile strength of typical tin-based bearing alloys is 6 to 9 kgf/mm2 (20°C). Tin alloy also has excellent anti-friction properties, and it is easy to weld with steel, copper alloy, aluminum alloy and other materials. It is a good anti-friction material and solder.
     Common alloying and impurity elements in tin alloys are antimony, lead, copper, bismuth and arsenic. Antimony is the main element for strengthening tin alloys. Lead can improve the casting properties of tin alloys, reduce pores in castings, and refine grains. However, lead reduces the specific heat of the tin alloy and deteriorates the thermal conductivity. Both bismuth and arsenic as impurities make the alloy brittle, so their content should be controlled at a low value.
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