Ceramic-Lined Copper Pipes Produced by A Centrifugal-SHS Process

A new technology is proposed for the ceramic lining of a copper pipe inner surface by means of self-propagating high-temperature synthesis(SHS)under the influence of a centrifugal force and additives.The technique is characterized by a large amount of the reaction heat and the centrifugal force applied to the reaction products.With the increase of the centrifugal force,the porosity,the density the compressive strength and the compressive-shear strength of the products are improved,but centrifugal force excel 200G,the compressive-shear strength of the products is decreased.Adding SiO2 in thermite,the porosity,the density and the compressive-shear strength of the products are obviously improved.Increasing preheating temperature of thermite,the speed of thermite reactions quicken,the properties of products can also be improved.