In situ decomposition of Ti₂AlN promoted interfacial bonding in ZnAl-Ti₂AlN biocomposites for bone repair

Abstract

In this study, in situ decomposition of Ti 2 AlN was used to obtain strong interfacial bonding in Zn7Al-Ti 2 AlN composites prepared via laser melting. During the preparation process, the Al atoms in Ti 2 AlN could diffuse out of the lattice due to the weak bonding between Al and Ti, followed by easily diffusing into the liquid Zn7Al matrix. Consequently, the diffused Al could bond with the Al in Zn7Al matrix owing to their inherent chemical affinity, leading to a strong interfacial bonding in Zn7Al-Ti 2 AlN composites. This significantly improved the load transfer ability and prohibited the motion of dislocations in the composites. As a result, the hardness and compressive strength of Zn7Al-Ti 2 AlN composites were enhanced from 74 HV and 155 MPa to 80 HV and 205 MPa, respectively, which were more suitable for bone repair application. What's more, the composites also showed improved accelerated degradation and cytocompatibility.

Advances in biocermets for bone implant applications

“…Therefore, the tensile strength increased from 203 of ZA27 to 310 MPa of ZA27-Ti 3 AlC 2 biocermets, and the bending strength of ZA27-Ti 3 AlC 2 biocermets increased by 55% than Ti 3 AlC 2 . Similarly, our recently study reported Zn-based biocermet with strong interface bonding ascribed to the in situ reaction between the Zn alloys and Ti 2 AlN [167]. Qia et al [168] fabricated Ti 3 SiC 2 and TiC reinforced Al 2 O 3 -based cermets by the in situ reaction between ceramics reinforcement and Ti matrix.…”

Advanced production routes for metal matrix composites

“…In this matter, using the selective laser melting technique, a study found that this process resulted in diffusion of the Al atoms in Ti 2 AlN out of the lattice so that the Al atoms could bond with the matrix forming Zn 7 Al. 99 Also, due to atom diffusion, Ti atoms separated from the Ti 2 AlN. The resulting Zn 7 Al-Ti 2 AlN composite had besides the main Zn enrich phase, Al enrich phase, and Ti 2 AlN phase, two new phases of TiN and Al 0.64 Ti 0.36 which were present at the interface and contributed to improved load transfer.…”

“…The resulting Zn 7 Al-Ti 2 AlN composite had besides the main Zn enrich phase, Al enrich phase, and Ti 2 AlN phase, two new phases of TiN and Al 0.64 Ti 0.36 which were present at the interface and contributed to improved load transfer. 99 A disadvantage of in-situ processing of MMCs is that dispersed materials are limited to only those that are thermodynamically stable in a particular matrix. Also, the size and shape of particles are determined by the kinetics of the process during the nucleation and growth activities.…”

“…The in situ decomposition reaction can be used to obtain strong interfacial bonding. In this matter, using the selective laser melting technique, a study found that this process resulted in diffusion of the Al atoms in Ti 2 AlN out of the lattice so that the Al atoms could bond with the matrix forming Zn 7 Al 99 . Also, due to atom diffusion, Ti atoms separated from the Ti 2 AlN.…”