Hardness and abrasive wear resistance of electron beam coatings cladded by using of “TiB–titanium matrix” composite powders

Abstract

The paper describes the structure, hardness and wear resistance of electron beam coatings cladded by using of “TiB–titanium binder” composite powders. The powders have been synthesized from titanium and boron powder mixtures by self-propagating high temperature synthesis (SHS) at wave burning mode. The SHS powders were cladded on titanium substrate VT1-0 by electron beam surfacing. A phase composition and a structure of the SHS powders and of the cladded coatings were investigated by X-ray diffraction and optical microscopy. According to structure investigation and hardness measurement in the “coating–titanium base plate” transition zone an adhesion between the coating and the substrate was high. The maximum hardness increase of the coatings strengthened by needle-like titanium monoboride inclusions was 2.2 times and abrasive wear resistance—3.7 times as compared with VTl-0 titanium.