Titanium alloy is a good structural and functional metal material with low density, high specific strength, corrosion resistance, non-magnetic property, and good biocompatibility. With the rapid development of the chemical industry, new energy, electronics, and other industries, precise titanium foil strips and their products are widely used. Conventional titanium strips and sheets are generally over 0.3mm thick, and their applications are relatively mature at present. In industry, the thickness of 0.01~0.3mm titanium strip is generally called a precision titanium foil strip. Precision titanium foil strip has excellent chemical properties, mechanical properties, dimensional accuracy, and surface characteristics, and its thickness is even measured in micrometers to meet the application requirements. It is mainly used in the chemical filler, new energy, 3C electronics, and other fields. In 2018, the domestic production of titanium coils is about 18000 t, accounting for 30% of the national production of titanium processing materials, which is one of the major domestic titanium products. However, precise titanium foil strips with thicknesses below 0.3mm account for less than 5% of the total production of titanium coils.
Compared with stainless steel, titanium has high strength, large rolling resilience, remarkable work hardening, poor thermal conductivity, and is prone to plate defects such as strip breakage, rolling cracking, and wave, as well as quality problems such as skin and hole caused by metallurgical defects, so it is difficult to prepare titanium coil material. Especially for precise titanium foil strips with a thickness < 0.3mm, it is more difficult to control the shape and internal and external quality.
