Microglial BDNF regulates susceptibility to the behavioral and synaptic effects of chronic stress

Abstract

Wear is a critical problem and common in several mechanical components, and it reduces the service span of the machine. To prevent the wear is a challenging job, especially in adverse working conditions. Coating of hard metals prevents the components from wear and increases the machine's service life. This current work studied experimentally the abrasive wear behaviour of HVOF sprayed WC-12Co and WC-20Cr₂C3-7Ni coatings. X-ray diffraction (XRD) and scanning electron microscopy(SEM) was used to characterize corresponding coatings for phase identification and microstructural investigation. Vickers hardness and a pin on the disc tester were used for microstructure and abrasive wear study. The Silicon carbide abrasive media was used as a counter surface and mounted on the circular disc by a suitable adhesive. SEM images with 3-D morphology were used to identify worn-out surface wear mechanisms. The result indicates that WC-12Co coating possesses a comparatively dense microstructure due to a strong Co binder. The WC-12Co coatings display higher microhardness and wear resistance due to dense microstructure. WC-12Co coating reveals 39 % & 38% minimum weight loss than WC-20Cr₂C3-7 N coating at both 20 N and 40 N load WC-12Co coating shows a higher Coefficient of friction. Cutting and delamination were identified as main wear mechanisms.