Structure and Properties of Composites Based on Titanium–Chromium Diboride

Abstract

The composites based on double titanium–chromium diboride are produced by hot pressing. The influence of aluminum nitride additives on the composition, structure, and mechanical and tribotechnical properties of the materials is studied. It is shown that the introduction of up to 10 vol.% AlN into (Ti, Cr)B₂ reduces the porosity and improves the mechanical and tribotechnical properties of the materials. The (Ti, Cr)B₂–AlN composites were wetted by NiAl alloy and the interaction areas were analyzed. The contact angles of wetting are close to zero in this system and terminal solid solutions form in the interaction area. This allowed (Ti, Cr)B₂–AlN–NiAl metal ceramics to be obtained. The metal ceramics sintered in vacuum have fine structure consisting of (Ti, Cr)B₂, AlN grains and NiAl alloy.