Wear alumina-based ceramics

Ceramic materials are also utilized in nuclear reactor components. Applications include insulation of pressure vessels with linings fabricated from silica and alumina-base ceramic bricks or fiber insulation pressure vessels made of prestressed concrete structures that enclose the entire reactor and secondary system wear-resistant surfaces produced by means of coatings such as chromium oxide or chromium carbide and shielding applications, which include materials such as concrete, graphite, and leaded glass ... 

Masuda, M., Sato, T., Kori, T. and Chujo, Y. (1994) Cutting performance and wear mechanism for alumina-based ceramic tools when machining austempered ductile iron. Wear 174 147-153. 

Kumar AS, Durai AR, Somakumar T (2006) The effect of tool wear on tool life of alumina-based ceramic cutting tools while machining hardened martensitic stainless steel. J Mater Process Technol 173(2) 151-156... 

The aim of the work is to fabricate alumina-based ceramics with high wear resistance. It is achieved by the usage of weakly aggregated nanopowders and by the apphcation of magnetic-pulsed compaction as well as by the addition of titania, magnesia and zirconia. 

The sintering at reduced down to 1450°C temperatures allowed to obtain the alumina-based ceramics which is 2.5-3 times more resistant to abrasive-erosive wear comparing with the best industrial ceramics with the same composition. Such ceramics combine high density, 0.97, small grain size of the alumina (<300 nm) and MgAl204 spanel (20 nm), high... 

Remarkable characteristics of nanocomposites observed by many researchers are summarized " Drastic change of fracture mode is observed from intergranular fracture of monolithic ceramics to transgranular fracture of nanocomposites, especially in alumina-based nanocomposites. Several mechanical properties were also improved, such as fracture strength, " " fracture toughness, " thermal shock resistance, creep resistance, " hardness, " and wear resistance." ... 

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