Explanation

Refers to the use of cobalt as the matrix, with a cobalt content generally of 35%? Between 70% and adding 5%? 25% nickel to stabilize y austenite. Add 20%? 25% Cr is a high temperature alloy to improve oxidation resistance and corrosion resistance. Therefore, cobalt based alloy is actually a Co ^ Ni Cr=element based alloy. The drill base alloy takes tungsten as the main strengthening element. Whether it is a cobalt base deformed alloy or a cobalt-basc cast superalloy, it contains 7%? 15% tungsten. Some alloy use tantalum or niobium to replace part of tungsten as the same solution strengthening element. The carbon content of cobalt based alloy is much higher than that of nickel based alloy. The carbon content of cobalt based foundry alloy is 0.25%? The range of 1.0% is 5 times that of nickel-base cast superalloy, and the carbon content of cobalt-base wrought superalloy is also high? 1%? 0.5% range. Carbon is an indispensable key element in drill base alloy. Carbon can form different types of carbide for precipitation strengthening. Therefore, the strengthening mechanism of drill base alloy is interstitial strengthening and carbide precipitation strengthening, especially intermetallic compound phase strengthening. Cobalt based high-temperature alloys, due to their high melting point, excellent oxidation resistance and corrosion resistance, gentle changes in the endurance curve (L-JW curve), good thermal fatigue resistance and welding performance, are still widely used in parts such as turbine guide blades in aviation engines and gas turbines in Western countries despite their high prices. Cobalt based alloys are excellent biomedical materials, suitable for manufacturing weight-bearing implants in the body, and mainly used for various people_ Manufacturing of X-joints, artificial bones, and orthopedic internal and external fixation; Manufacturing of demure, various foundry crowns and embedded volume fixed bridges in dental restoration; Also used in cardiovascular surgery and plastic surgery. Cobalt based alloy used for biomedical materials include foundry CoCrMo alloy, forged CoCrMo alloy, forged CoNiCrMo alloy, forged Co CrWNi alloy, forged ('oONIMoFe alloy, forged CoNi CrMoWFe alloy, etc.

Classification