The effect of Ti addition on the microstructure and fracture toughness of BN-Al composite materials synthesized by vacuum infiltration

Abstract

In this paper, we studied the effect of Ti addition on the microstruêture and fracture toughness of Boron nitride-Aluminum (BN-Al) composite materials that were synthesized by vacuum infiltration. The BN-Al composite materials were fabricated by preheating the [Ti+BN] preforms at 1700° for 1 hour before Al alloys were infiltrated into the preforms in a vacuum atmosphere at 1100° for 2 hours. X-ray diffraction (XRD) patterns showed that the diffraction peaks of titanium diboride (TiB2) appeared when the [Ti+BN] preforms were preheated. It is thought that metal Al protected are visible and this could be achieved by the generation of TiB 2 when Al infiltrated into the preform from fractography. The matching fracture toughness of the [Ti+BN] Dreforms eraduallv improve when Ti content was increased.