A study of ceramic-lined compound copper pipe produced by SHS-centrifugal casting

摘要

In this study ceramic-lined compound copper pipe (CLCCP) was produced by self-propagating high-temperature synthesis (SHS) and centrifugal casting technology. The effects of additives such as SiO_2, CrO_3 Na_2B_4O_7 and ZrO_2 on the densification degree, combining strength and the toughness of the ceramic layer were of prime interest. The results show that the densification degree of the ceramic layer can be improved by adding SiO_2 and CrO_3 in the thermite. This improvement correlated with the reduction of porosity of ceramic layer. The combining strength is increased through the addition of a suitable amount of Na_2B_4O_7. The highest fracture toughness of ceramic layer is obtained at 7 wt. percent of ZrO_2 in thermite. The CLCCP shows excellent sendee properties when it is used in tubular billet crystallizer, including the prevention of cracks and flakes.