Application and classification of nickel alloys
① Nickel-based superalloy. The main alloy elements are chromium, tungsten, molybdenum, cobalt, aluminum,titanium.html> titanium, boron, zirconium and so on. Among them, chromium plays the role of anti-oxidation and anti-corrosion, and other elements play the role of strengthening. It has high strength, oxidation resistance and gas corrosion resistance at 650 ~ 1000℃. It is the most widely used alloy with the highest high temperature strength. This aspect of talent is scarce mainly concentrated in the iron and steel talent network. It is used in the manufacture of aircraft engine blades and high-temperature components for rocket engines, nuclear reactors and energy conversion equipment.
② Nickel-based corrosion resistant alloy. The main alloying elements are copper, chromium and molybdenum. With good comprehensive performance, can withstand various acid corrosion and stress corrosion. The first was nickel-copper alloy, also known as Monel; In addition to nichrome alloy, nichrome molybdenum alloy, nichrome molybdenum alloy and so on. Used for manufacturing various corrosion resistant parts and components.
③ nickel-based wear resistant alloy. The main alloying elements are chromium, molybdenum and tungsten, with small amounts of niobium, tantalum and indium. In addition to wear resistance, its oxidation resistance, corrosion resistance, welding performance is good. It can make wear-resistant parts and can also be used as cladding material, which can be coated on the surface of other substrate materials by surfacing and spraying process.
④ nickel base precision alloy. Including nickel - based soft magnetic alloy, nickel - based precision resistance alloy and nickel - based electric heating alloy. The most commonly used soft magnetic alloy is about 80% nickel Permo alloy, its maximum permeability and initial permeability is high, low coercivity, is an important core material in the electronics industry. The main alloying elements of nickel base precision resistance alloy are chromium, aluminum and copper. This alloy has high resistivity, low resistivity temperature coefficient and good corrosion resistance, which is used to make resistors. Nickel base electric heating alloy is 20% nickel alloy containing chromium, has good oxidation resistance, corrosion resistance, can be used for a long time at 1000 ~ 1100℃ temperature.
⑤ Nickel-based shape memory alloy. Nickel alloy containing 50 (at)% titanium. Its recovery temperature is 70℃, shape memory effect is good. The recovery temperature can be changed in the range of 30 ~ 100℃ by changing the proportion of Ni - Ti composition slightly. It is widely used in the manufacture of automatic opening structures for spacecraft, self-stimulating fasteners for aerospace industry, artificial heart motors for biomedical applications, etc.
