Reactive hot pressing and mechanical properties of B 4 C/Li 2 O–Al 2 O 3 –SiO 2 composites
Reactive hot pressing and mechanical properties of B 4 C/Li 2 O–Al 2 O 3 –SiO 2 composites
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DOI：
10.1016/j.jnoncrysol.2015.11.012
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发表时间：
2016-01
影响因子：
3.5
通讯作者：
L. Xia;B. Zhong;T. Song;Songsong Wu;Tao Zhang;G. Wen
中科院分区：
文献类型：
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作者：
L. Xia;B. Zhong;T. Song;Songsong Wu;Tao Zhang;G. Wen
采用热压工艺制备了不同B4C含量的B4C/Li2O-Al_2O_3-SiO_2(B4C/LAS)复合材料。研究了B4C/LAS复合材料的力学性能与初始B4C含量的关系。B4C的加入使复合材料的断裂韧性和弯曲强度在初始阶段均有所下降。当初始B4C含量增加到10wt%时，B4C/LAS复合材料的力学性能有所提高。X-射线光电子能谱、X-射线衍射仪和透射电子显微镜分析表明，B4C与LAS发生了化学反应。高相对密度、高结晶度和细晶粒度的协同作用是提高B4C/LAS复合材料力学性能的主要原因。
B4C/Li2O–Al2O3–SiO2(B4C/LAS) composites with different B4C contents were fabricated using hot-pressing technique. Mechanical properties of the B4C/LAS composites were investigated as a function of initial B4C content. The addition of B4C deteriorated both fracture toughness and flexural strength of the composites initially. B4C/LAS composites demonstrated improved mechanical properties when initial B4C content increased to 10 wt.%. XPS, XRD and TEM analyses illustrated that a chemical reaction took place between B4C and LAS matrix. The synergism of high relative density, high crystallinity and fine grain size, was responsible for improved mechanical properties of B4C/LAS composites.