About this Abstract |
Meeting |
MS&T21: Materials Science & Technology
|
Symposium
|
Manufacturing and Processing of Advanced Ceramic Materials
|
Presentation Title |
Spark Plasma Joining of HfB2-ZrB2-SiC Composites Using Ni as a Filler |
Author(s) |
Shipra Bajpai, Alok Bhadauria, T. Venkateswaran, Sudhanshu Shekhar Singh, Kantesh Balani |
On-Site Speaker (Planned) |
Shipra Bajpai |
Abstract Scope |
Real-life applications of Ultra-high temperature ceramics require them to be joined into the final complex shapes. Herein, pre-sintered HfB2-ZrB2-SiC (HZS) composite was diffusion bonded by spark plasma joining (1100 °C, 18 MPa) with pure Ni powder interlayer. The interfacial microstructure evolution and its effect on the hardness were investigated. Microstructure and phase analysis shows that Ni reacted preferentially with SiC and formed Ni2Si phase that leads to a large interaction layer (~ 200 µm) and smaller Ni joint layer (~ 40 µm). Uniform micro-hardness of 16 GPa was obtained at HZS composite, interaction layer, and Ni joint region, owing to good bonding, no apparent cracking, and compositional homogeneity at the interface. Modulus distribution and wear mechanism were also investigated by dynamic modulus mapping and micro-scratch testing, which demonstrates spark plasma joining as a useful approach to produce complex components without compromising mechanical and tribological properties across the joint. |