Microstructure, hardness and fracture toughness of spark plasma sintered ZrB2-SiC-Cf composites

被引：79
作者：
Asl, Mehdi Shahedi [1 ]
机构：
[1] Univ Mohaghegh Ardabili, Dept Mech Engn, Ardebil, Iran
来源：
CERAMICS INTERNATIONAL | 2017年 / 43卷 / 17期
关键词：
ZrB2 SiC composite; Carbon fiber; Nano-particles; Taguchi method; Mechanical properties; THERMAL-SHOCK RESISTANCE; HOT-PRESSING PARAMETERS; MECHANICAL-PROPERTIES; FRACTOGRAPHICAL CHARACTERIZATION; ZRB2-BASED COMPOSITES; ZIRCONIUM DIBORIDE; ZRO2/SIC RATIO; CARBON-FIBERS; DENSIFICATION; MATRIX;
D O I：
10.1016/j.ceramint.2017.08.030
中图分类号：
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
The combined effects of SiC particles and chopped carbon fibers (C-f) as well as sintering conditions on the microstructure and mechanical properties of spark plasma sintered ZrB2-based composites were investigated by Taguchi methodology. Analysis of variance was used to optimize the spark plasma sintering variables (temperature, time and pressure) and the composition (SiC/C-f ratio) in order to enhance the hardness of ZrB2-SiC-C-f composites. The sintering temperature was found as the most effective variable, with a significance of 83%, on the hardness. The hardest ZrB2-based ceramic was achievable by adding 20 vol% SiC and 10 vol% Cf after spark plasma sintering at 1850 degrees C for 6 min under 30 MPa. Fracture toughness improvement were related to the simultaneous presence of SiC and Cf phases as well as the in-situ formation of nano-sized interfacial ZrC particles. Crack deflection, crack branching and crack bridging were detected as the toughening mechanisms. A Vickers hardness of 14.8 GPa and an indentation fracture toughness of 6.8 MPa m(1/2) were measured for the sample fabricated at optimal processing conditions.
引用
收藏
页码：15047 / 15052
页数：6
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