2019/02/26 by Maxim Sokol, Jian Wang, Sokol, Maxim +5
Engineering · Materials Science · #Advanced ceramic materials synthesis #Aluminum Alloys Composites Properties #FOS: Physical sciences #MXene and MAX Phase Materials #Materials Science (cond-mat.mtrl-sci)
paper · pdf · doi:10.48550/arxiv.1902.10001
openalex publication_date 2019/02/26 · openalex created_date 2022/07/29 · openalex updated_date 2026/07/28
Alumina forming, oxidation and thermal shock resistant MAX phases are of a\nhigh interest for high temperature applications. Herein we report, on bonding\nand resulting interactions between a Ni-based superalloy, NSA, and two alumina\nforming MAX phases. The diffusion couples Cr2AlC/Inconel-718/Ti2AlC\nwere assembled and heated to 1000 or 1100\degC in a vacuum hot press under\nloads corresponding to stresses of either 2 MPa or 20 MPa. The resulting\ninterfaces were examined using X-ray diffraction, scanning electron microscopy\nand energy-dispersive X-ray spectroscopy. Good bonding between Cr2AlC and\nNSA was achieved after hot pressing at 1000\degC and a contact pressure of\nonly 2 MPa; in the case of Ti2AlC a higher temperature (1100\degC) and\npressure (20 MPa) were needed. In both cases, a diffusion bond was realized\nwith no evidence of interfacial damage or cracking after cooling to room\ntemperature. Twenty thermal cycles from room temperature to 1000\degC showed\nthat Ti2AlC is a poor oxidation barrier for Inconel-718. However, in the\ncase of Cr2AlC no cracks, delamination nor surface degradation were\nobserved, suggesting that this material could be used to protect Inconel-718\nfrom oxidation.\n