Titanium alloy drill tool surface wear resistant coating and method of making same

Abstract

This invention discloses a wear-resistant coating for titanium alloy drill bits and its preparation method. The method includes a multi-layer mixed powder, comprising a matrix powder and a reinforcing powder mixed in a gradient ratio. The mixed powder is laid on the surface of the titanium alloy drill bit in descending order of matrix powder content, followed by cladding to obtain the wear-resistant coating. The matrix powder has the same alloy composition as the titanium alloy drill bit, specifically comprising a first alloy powder and a second alloy powder with different particle sizes. The wear-resistant coating obtained by this invention enables titanium alloy drill bits to possess not only high hardness, wear resistance, and impact resistance during downhole drilling, but also a certain degree of corrosion resistance, meeting the requirements for titanium alloy drill bits used in deep and ultra-deep well drilling.