The development of electroconductive ceramic materials to replace conventional metal parts allows the production of high-performance electronic devices, wear parts, electrodes, high temperature heathers, heat exchangers, and so on. In particular the addition of 30% TiB2 on Al2O3 matrix can lower its electrical resistivity down 10-3 Ohm.cm and at the same time can increase its hardness strength and fracture toughness. Since applications require a suitable corrosion resistance, it is important to evaluate the corrosion behaviour of these electroconductive ceramic materials towards common aggressive environments, such neutral or acidic chloride solutions. In this work, two different composites (50%Al2O3-50%TiB2 and 70%Al2O3-30%TiB2) were exposed to 3.5%NaCl solutions at pH 7 and 3; the corrosion was studied by electrochemical tests and chemical analyses and was compared to the behaviour of monolithic TiB2 material
The corrosion behaviour of alumina/titanium diboride composites in neutral and acidic chloride solutions
MONTICELLI, Cecilia;BALBO, Andrea;
2001
Abstract
The development of electroconductive ceramic materials to replace conventional metal parts allows the production of high-performance electronic devices, wear parts, electrodes, high temperature heathers, heat exchangers, and so on. In particular the addition of 30% TiB2 on Al2O3 matrix can lower its electrical resistivity down 10-3 Ohm.cm and at the same time can increase its hardness strength and fracture toughness. Since applications require a suitable corrosion resistance, it is important to evaluate the corrosion behaviour of these electroconductive ceramic materials towards common aggressive environments, such neutral or acidic chloride solutions. In this work, two different composites (50%Al2O3-50%TiB2 and 70%Al2O3-30%TiB2) were exposed to 3.5%NaCl solutions at pH 7 and 3; the corrosion was studied by electrochemical tests and chemical analyses and was compared to the behaviour of monolithic TiB2 materialI documenti in SFERA sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
