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Problems in the development of nickel-titanium memory alloys

wallpapers News 2020-05-07
As a kind of shape memory alloy, nickel-titanium memory alloy has an expansion rate of more than 20%, a fatigue life of 1 * 10 to the 7th power, damping characteristics 10 times higher than ordinary springs, and its corrosion resistance is better than the current It is a popular medical stainless steel, so it can meet the needs of various engineering and medical applications, and is a very excellent functional material.

Especially for memory alloy materials, in addition to the unique shape memory function, with its excellent characteristics of wear resistance, corrosion resistance, high damping and super elasticity, it has a wide range in bioengineering, medicine, energy and automation. Application prospects.

Nickel-titanium memory alloys facing problems

1. The raw material smelting capacity needs to be further improved. At present, the maximum ingot mass obtained by domestic smelting equipment is less than 50 kg, even if it is remelted many times, it is difficult to eliminate the unevenness of composition between different parts. Moreover, it is difficult to guarantee the consistency of the composition of different ingots obtained with the same quality and ratio of raw materials. This brings trouble to the styling of subsequent products, such as wire or plate, and requires constant adjustment of the process to obtain the best memory or super-elastic performance.

2. The hot and cold processing capacity of the material needs to be further improved. At present, many countries are still unable to produce nitinol pipe and rectangular wire. The thickness of the thin plate produced is about 0.1mm, and the diameter of the wire is as thin as 0.07mm.

3. The product is relatively primary, and the technical content and added value of the product are not very high. In 1999 and 2000, NiTi alloy wire was mainly used for antenna, and in 2001 and 2002, NiTi alloy wire was mainly used for spectacle frame products. Current medical products are limited to implantation in body fluids, muscles, or bone tissues, and intervention products entering the blood environment need to be resolved. The outstanding problem is that it is difficult to form a joint force, it is easy to get quick results, ignore basic work, often do not pay attention to standardization, and the enterprise development lacks stamina.

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Tag: nitinol