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Zhao Y.-W.,Harbin Institute of Technology | Zhao Y.-W.,Aerospace Research Institute of Materials And Processing Technology | Wang Y.-J.,Harbin Institute of Technology | Jin X.-Y.,Harbin Institute of Technology | And 7 more authors.
Materials Chemistry and Physics | Year: 2015

Dense ZrC-W composite with 55.3 vol% ZrC and 44.7 vol% W was fabricated by reactive infiltration of molten Zr2Cu alloy into porous and rigid WC/W preform at low temperature (1300 °C) in vacuum. The liquid Zr2Cu alloy spontaneously infiltrated into the porous preform and underwent a displacement reaction with WC to fully form ZrC-W composite by substituting WC preform to WC/W perform. The formed ZrC-W composite had a flexural strength of 489 MPa, a Vickers hardness of 8.3 GPa, a Young's modulus of 352 GPa, and a fracture toughness of 9.8 MPa m1/2, which was two times higher than monoclinic ZrC. © 2014 Elsevier B.V. All rights reserved. Source


Zhao Y.-W.,Aerospace Research Institute of Materials And Processing Technology | Zhao Y.-W.,Harbin Institute of Technology | Wang Y.-J.,Harbin Institute of Technology | Chen L.,Harbin Institute of Technology | And 4 more authors.
International Journal of Refractory Metals and Hard Materials | Year: 2013

Fully dense ZrCW matrix composite was fabricated by reactive infiltration technique, where molten Zr2Cu alloy infiltrated into a porous WC preform at 1300 °C in vacuum. The ZrCW composite exhibits a core-shell structure feature: gray WC cores were enveloped by bright tungsten shells, which are homogeneously distributed in the ZrC matrix. X-ray diffraction and transmission electron microscopy investigation show that nano-sized Zr xCuyCz particles were formed in the ZrC matrix. The Vicker's hardness, flexural strength and fracture toughness of the ZrCW composite are measured as 14.5 GPa, 615 MPa and 11.7 MPa m1/2, respectively. Crown Copyright © 2012 Published by Elsevier Ltd. All rights reserved. Source


Chen L.,Harbin Institute of Technology | Wang Y.,Harbin Institute of Technology | Cui L.,Harbin Institute of Technology | Zhou Y.,Harbin Institute of Technology | And 2 more authors.
Journal of the American Ceramic Society | Year: 2012

The ZrB 2-BN composite without ZrC impurity was prepared successfully using reactive hot pressing via carbothermal reduction of ZrO 2 with B 4C, C, and BN powders. The influences of additives and sintering temperature on the phase and microstructure of composites were investigated. The formation reaction of ZrC was inhibited by decreasing the evaporation of intermediate product B 2O 3 due to forming a SiO 2-B 2O 3 eutectic system with the addition of SiO 2 or SiO 2-CaF 2. In comparison, SiO 2-CaF 2 exhibited better inhibition capacity of ZrC. ZrB 2-BN composite without impure ZrC phase was achieved. In addition, the content of ZrO 2 decreased with increasing sintering temperature, and finally disappeared when sintered at 1800°C. Moreover, the relative density of the ZrB 2-BN composite reached 96.9%. © 2012 The American Ceramic Society. Source


Wang D.,Harbin Institute of Technology | Wang Y.,Harbin Institute of Technology | Rao J.,Harbin Institute of Technology | Ouyang J.,Harbin Institute of Technology | And 2 more authors.
Materials Science and Engineering A | Year: 2013

Cf/ZrC composites were fabricated at temperatures of 1200-1400°C by reactive melt infiltration (RMI) using C/C as the preforms and Zr2Cu as the infiltrator. The effects of infiltration time and temperature on microstructure and properties of the composites were investigated. Results show that there was still un-reacted Zr2Cu left in the matrix when the reaction time was not long enough. ZrC grains coarsened and partial Cu evaporated when the time became longer. The infiltration time could be shortened as the infiltration temperature increased, whereas the morphology of ZrC changed from irregular polyhedra to octahedra with faceted surfaces. Composites prepared at 1200°C for 4h exhibit superior fracture work (~103J/m2) and ablation resistance. The linear ablation rate of the composites is 0.00024mm/s. Such a low value is attributed to the formation of a ZrO2 protective layer and the cooling mechanism via evaporation of residual Cu in the matrix. © 2013 Elsevier B.V. Source

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