The wear resistance of MMCs can be improved by increasing the volume fraction of the reinforcing ceramic phase (HRC) by as much as 70%. Among the various types of HRC composites, a new Al2O3-Al co-continuous ceramic/metal composite (referred to as C4 composite) has been recently produced at The Ohio State University. A new method of preparation, based on a displacement reaction between a silica precursor (whose frame is faithfully reproduced in the composite product) and molten aluminum, allows the production of a MMC where both the Al2O3 and Al phases are continuous and interpenetrating. The aim of the present work was to investigate the tribological behavior of C4 Al2O3/Al composites under dry sliding conditions using a computer-controlled slider-on-cylinder tribometer. The tests were carried out at applied loads in the range 5-30 N and sliding speeds in the range 0.3-1.8 m/s, for sliding distances up to 10 km. Wear scars and debris were characterized by means of scanning electron mi...
Friction and wear behaviour of C4 Al2O3/Al composites under sly sliding conditions
GARAGNANI, Gian Luca;
1998
Abstract
The wear resistance of MMCs can be improved by increasing the volume fraction of the reinforcing ceramic phase (HRC) by as much as 70%. Among the various types of HRC composites, a new Al2O3-Al co-continuous ceramic/metal composite (referred to as C4 composite) has been recently produced at The Ohio State University. A new method of preparation, based on a displacement reaction between a silica precursor (whose frame is faithfully reproduced in the composite product) and molten aluminum, allows the production of a MMC where both the Al2O3 and Al phases are continuous and interpenetrating. The aim of the present work was to investigate the tribological behavior of C4 Al2O3/Al composites under dry sliding conditions using a computer-controlled slider-on-cylinder tribometer. The tests were carried out at applied loads in the range 5-30 N and sliding speeds in the range 0.3-1.8 m/s, for sliding distances up to 10 km. Wear scars and debris were characterized by means of scanning electron mi...I documenti in SFERA sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
