3D interconnected architecture of h-BN reinforced ZrO2 composites: Structural evolution and enhanced mechanical properties for bone implant applications. Issue 1 (January 2019)

• Record Type: Journal Article
• Authors: Gautam, Chandkiram; Gautam, Amarendra; Mishra, Vijay Kumar; Ahmad, Naseer; Trivedi, Ritu; Biradar, Santoshkumar
• Is Part Of: Ceramics international. Volume 45:Issue 1(2019)
• Page Start: 1037
• Page End: 1048
• Publication Date: 2019-01
• Subjects: Biocomposites -- Infrared spectroscopy -- SEM -- TEM -- Mechanical properties -- Cytotoxicity; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2018.09.283
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: The present investigation mainly focused on hexagonal boron nitride (h-BN) substitution for modified physical, mechanical and biological properties of nano zirconia (nZrO2 ).A simple and scalable solid-state reaction method has been used to prepare a three dimensional (3-D) composites in the system [(15+x)BN-(85-x)ZrO2 ] (0 ≤x ≤ 55). A major novel phase of zirconium oxynitrate, ZrO(NO3 )2 was confirmed by X-ray diffraction(XRD) results. The uniform and interconnected distribution of large h-BN nanosheets ensure the significant grain refinement of nZrO2 established by surface morphology study of fabricated composites. This reinforcement of h-BN plays a pivotal role to enhance the ductility of zirconia. The composite sample 70B-30Z has a remarkable mechanical strength and less wear resistance as compared to the natural bone, for this sample (70B-30Z) various mechanical parameters i.e. Young's modulus, fracture toughness, maximum mechanical strength, and density are found to be 9.84 MPa, 4.12 MPa m 1/2, 174.94 MPa, and 2.54 g cm −3 respectively. The noteworthy cell proliferation at 25 µg/ml by MTT assay for the composite 70B-30Z recognizes it as a suitable bone implant material. Graphical abstract: