The rule of high alumina advance engineering ceramics as wear resistance materials

Progressing of technology and production in iron industries especially steel, iron oxide processing and coal in Iran causes to increase costs for preventing corrosion of equipments in those industries. There are different materials such as hard metals and polymers to protect wearing problems. One of the most hardest and economic materials that can be used for protection of equipments from corrosion is high alumina ceramic parts. By establishment of a factory to produce high alumina ceramics in Iran and installing these ceramic parts in one of iron oxide processing plan, Gohar Ravesh Sirjan Co., it was possible to increase production capacity., This was occurred by extending the repairing period time and also feeding of raw materials to the processing system. Except hardness of high alumina ceramics, there are different properties that make these materials more valuable and interesting to use. In this industrial experiment, wear resistance high alumina ceramics is used with Al(2)O(3) content of more than 92 wt%. In this practical study physical and chemical properties and also the life time of these kinds of ceramic materials are investigated. Also the hardness and life time of these ceramics are compared with trading hard metals. To provide scientific data some properties of high alumina ceramic like, density, hardness, microstructure and mechanical strength were studied. For example, it was found that the hardness of high alumina ceramic is 1800 to 2000 HV with compare to hard metal which in same scale is 550 to 630; this is showing that the wear resistance of high alumina ceramic is almost four times more than hard metals. In practice depend on place of application; the life. time of ceramic can be increased more than eight times. Ceramics also have some limitation to use such as low toughness and installation methods.