PROCESS FOR THE MANUFACTURE OF LOW-DENSITY COMPONENTS, HAVING A POLYMER OR METAL MATRIX SUBSTRATE AND CERAMICS AND/OR METAL-CERAMICS COATING AND LOW DENSITY COMPONENTS OF HIGH SURFACE STRENGTH THUS OBTAINED

摘要

Process for the manufacture of low density components of high surface strength having a polymer or metal matrix substrate and ceramics and/or metal-ceramics coating, wherein the low density substrate to be coated is subjected to the following steps: optionally, machining the surface in order to generate residual compressive stress in the outer layers; optionally, thermal stabilising at a temperature lower than 350 °C; depositing onto the outer surface, with hot spraying techniques at a temperature ranging from 70° to 350 °C, of a coating layer in ceramics and/or metal-ceramics material of a surface strength higher than that of the component to be coated, the surface of the coating layer being optionally subjected to a finishing treatment. The invention also relates to the low density components of high surface strength thus obtained.The figure is a persepective view of a recirculating ball unit with the raceway P coated in conformity with an embodiment according to the invention.