Work

Microstructure and interfacial stability of diffusion bonded HfB2-SiC and ZrB2-SiC based composites

Year: 2025

Type: article

Abstract: Manufacturing of complex-shaped UHTCs occasionally requires joining of dissimilar materials. Herein diffusion bonded (1800 °C and 40 MPa) two dissimilar composites, ZrB 2 -20vol%SiC (ZS) and HfB 2 -20vol% SiC (HS), are compared with similar ones i.e., ZS-ZS. The ZS-ZS joints exhibit a seamless interface with uniform hardness (∼20 GPa) and Young’s Modulus (∼366 GPa). For ZS-HS, diffusion and reactivity between Hf and Zr created an interface with (Zr, Hf)B 2 solid solution , thus, decreasing interfacial hardness and Young’s modulus (by ∼17 %, ∼3 %) from HS sides, but were similar to that of ZS side. Under compressive stresses, both joints exhibited interfacial stability and comparable bending and shear strength , i.e., (∼259 MPa, ∼87 MPa for ZS-HS, and ∼296 MPa, ∼113 MPa for ZS-ZS). Though good thermal stability of joints is observed when oxidized at 1400 °C, 60 min, ZS-ZS joints with uniform mechanical properties and good structural and thermal stability are more promising for complex shape applications.

Source: Journal of the European Ceramic Society

DOI: 10.1016/j.jeurceramsoc.2025.117489

Authors: Shipra Bajpai, Kunwar Pratap Singh, Prince Setia, T. Venkateswaran, Kantesh Balani

Institutions: Indian Institute of Technology Kanpur, Vikram Sarabhai Space Centre

Language: English

Topic: Advanced ceramic materials synthesis

Subfield: Ceramics and Composites

Field: Materials Science

Domain: Physical Sciences

Open Access status: hybrid

Estimated APC paid: $3,900

Funders: Indian Institute of Technology Kanpur, Indian Space Research Organisation