TY - GEN
T1 - In-situ preparation and mechanical properties of (ZrB2+ZrC)/ Zr3[Al(Si)]4C6 composites
AU - Yu, Lei
AU - Yang, Jian
AU - Qiu, Tai
PY - 2014
Y1 - 2014
N2 - Fully dense (ZrB2+ZrC)/Zr3[Al(Si)]4C 6 composites with ZrB2 content varying from 0 to 15 vol.% and fixed ZrC content of 10 vol.% were successfully prepared by in situ hot-pressing in Ar atmosphere using ZrH2, Al, Si, C and B 4C as raw materials. With the increase of ZrB2 content, both the bending strength and fracture toughness of the composites increase and then decrease. The synergistic action of ZrB2 and ZrC as reinforcements shows significant strengthening and toughing effect to the Zr3[Al(Si)]4C6 matrix. The composite with 10 vol.% ZrB2 shows the optimal mechanical properties: 516 MPa for bending strength and 6.52 MPa·m1/2 for fracture toughness. With the increase of ZrB2 content, the Vickers' hardness of the composites shows a near-linear increase from 15.3 GPa to 16.7 GPa. The strengthening and toughening effect can be ascribed to the unique mechanical properties of ZrB2 and ZrC reinforcements, the differences in coefficient of thermal expansion and modulus between them and Zr 3[Al(Si)]4C6 matrix, fine grain strengthening and uniform microstructure derived by the in situ synthesis reaction.
AB - Fully dense (ZrB2+ZrC)/Zr3[Al(Si)]4C 6 composites with ZrB2 content varying from 0 to 15 vol.% and fixed ZrC content of 10 vol.% were successfully prepared by in situ hot-pressing in Ar atmosphere using ZrH2, Al, Si, C and B 4C as raw materials. With the increase of ZrB2 content, both the bending strength and fracture toughness of the composites increase and then decrease. The synergistic action of ZrB2 and ZrC as reinforcements shows significant strengthening and toughing effect to the Zr3[Al(Si)]4C6 matrix. The composite with 10 vol.% ZrB2 shows the optimal mechanical properties: 516 MPa for bending strength and 6.52 MPa·m1/2 for fracture toughness. With the increase of ZrB2 content, the Vickers' hardness of the composites shows a near-linear increase from 15.3 GPa to 16.7 GPa. The strengthening and toughening effect can be ascribed to the unique mechanical properties of ZrB2 and ZrC reinforcements, the differences in coefficient of thermal expansion and modulus between them and Zr 3[Al(Si)]4C6 matrix, fine grain strengthening and uniform microstructure derived by the in situ synthesis reaction.
KW - Mechanical properties
KW - Ultra-high temperature ceramics
UR - http://www.scopus.com/inward/record.url?scp=84899013631&partnerID=8YFLogxK
U2 - 10.4028/www.scientific.net/KEM.602-603.438
DO - 10.4028/www.scientific.net/KEM.602-603.438
M3 - 会议稿件
AN - SCOPUS:84899013631
SN - 9783038350415
T3 - Key Engineering Materials
SP - 438
EP - 442
BT - High-Performance Ceramics VIII
PB - Trans Tech Publications Ltd
T2 - 8th International Conference on High-Performance Ceramics, CICC 2013
Y2 - 4 November 2013 through 7 November 2013
ER -