Affiliation:
1. Key Laboratory of Solidification Control and Digital Preparation Technology (Liaoning Province) School of Materials Science and Engineering, Dalian University of Technology Dalian P. R. China
2. Key Laboratory of Advanced Technology for Aerospace Vehicles (Liaoning Province) School of Aeronautics and Astronautics, Dalian University of Technology Dalian P. R. China
Abstract
AbstractThe densification behavior and mechanical properties of ZrB2‐based composites were investigated. The results demonstrated that the fully dense ZrB2‐based composites could be obtained at lower sintering temperature (1600°C) and pressure (30 MPa) when the content of HfSi2 was above 20 vol.%. The as‐sintered composite was a special core–shell structure, with ZrB2 as the core and (Zr, Hf)B2 solid solution as the shell. The core–shell structure resulted from the diffusion of Hf atom into the boride matrix, which could accelerate the densification. In addition, the intergranular liquid phase induced by the HfSi2 addition filled the micropores of the composites effectively during the sintering. When the content of HfSi2 increased to 20 vol.%, its compressive strength, hardness, and fracture toughness all reached the maximum values, which were 1617 MPa, 15.99 GPa, and 2.44 MPa m1/2, respectively.
Funder
National Natural Science Foundation of China
Subject
Materials Chemistry,Marketing,Condensed Matter Physics,Ceramics and Composites
Cited by
1 articles.
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