Sliding Wear Characteristics of Iron Containing Multiple Boride Base Cermet

Abstract

An advanced iron containing multiple boride base cermet has been developed. This new type of cermet consists of a Mo₂FeB₂ type complex boride as a hard phase and a ferrous binder phase has excellent wear and corrosion resistance. The dry adhesive wear properties of the cermet against mild steel and alloy steels were studied by Ogoshi wear tester (a ring-on-block type) at sliding velocities of 0.1 m/s to 4.39 m/s. The wear characteristics were compared with that of high speed steel and cemented carbide. From the experiments, results were summarized as follows ;
(1) The sliding wear characteristics of the boride cermet against mild steel at low sliding velocity are very similar to that of steels due to the ferrous binder phase, however, quite different from that at middle and high sliding velocity range presumably due to its hard phase.
(2) The wear characteristics of the boride cermet and cemented carbide against hard steels (SKH3, SUJ2, SKD11 and SUS440C ) significantly depend on the counter materials. The specific wear rate ( W_s) of the boride cermet against SKH3 and SUJ2 is nearly the same as cemented carbide, and the W_s of this cermet against SKD11 and SUS440C is less than that of cemented carbide.