Spark plasma sintering and toughening of graphene platelets reinforced SiBCN nanocomposites
Spark plasma sintering and toughening of graphene platelets reinforced SiBCN nanocomposites
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DOI：
10.1016/j.ceramint.2015.05.011
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发表时间：
2015-11
影响因子：
5.2
通讯作者：
Daxin Li;Zhihua Yang;D. Jia;X. Duan;P. He;Jie Yu;Yu Zhou
中科院分区：
文献类型：
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作者：
Daxin Li;Zhihua Yang;D. Jia;X. Duan;P. He;Jie Yu;Yu Zhou
研究了在 SiBCN 纳米复合材料中加入石墨烯片（GPL）作为纳米填料的可能性，以评估机械性能的潜在改进。通过球磨石墨烯片和SiBCN非晶粉末与Al2O3球制备GPL-SiBCN混合粉末，通过放电等离子烧结技术固结成不同石墨烯片含量的块状样品。添加石墨烯片晶对断裂韧性的提高效果尤为显着，并且随着复合材料中GPL含量的增加，断裂韧性迅速增加。 GPL含量为5vol%的GPL/SiBCN陶瓷的断裂韧性提高了近650%，最高达到5.40±0.63MPa·m1/2。结果表明，陶瓷纳米复合材料中的纳米填料保持均匀并在高温下存活。石墨烯片层增强SiBCN陶瓷的主要增韧机制是拔出、桥联、裂纹渗透石墨烯和裂纹偏转。
The possibility of incorporating graphene platelets (GPL) as nanofillers in SiBCN nanocomposites was studied to evaluate the potential improvement on mechanical properties. GPL-SiBCN mixed powders prepared by ball milling of graphene platelets and SiBCN amorphous powders with Al2O3balls was consolidated by spark plasma sintering technique to form bulk samples with different contents of graphene platelets. The effect of added graphene platelets on the improvement of fracture toughness is particularly significant and the fracture toughness increases rapidly with increasing GPL content in the composites. Nearly 650% increase in fracture toughness of GPL/SiBCN ceramic with 5 vol% GPL content, reaching a maximum of 5.40±0.63 MPa·m1/2. Results show that the nanofillers in ceramic nanocomposites remained uniformly and survived at high temperature. Main toughening mechanisms in graphene platelets reinforced SiBCN ceramic are pull-out, bridging, crack penetration graphene and crack deflection.