李坤
,
裴志亮
,
宫骏
,
石南林
,
孙超
金属学报
利用Sol-Gel方法, 通过优化溶胶的配置、纤维提拉过程和干燥烧结等工艺过程,在碳纤维表面制备出均匀的、无裂纹的SiO2涂层. 采用SEM、XPS和TEM表征了碳纤维表面SiO2涂层的结构、形貌、元素分布以及涂层碳纤维/镁基体的界面结构. 结果表明, 涂覆SiO2的碳纤维, 抗氧化能力提高, 拉伸性能略有降低, 但与镁基体复合后其拉伸强度降低了20%. SiO2涂层改善了Mg对碳纤维的润湿能力, 有效地促进了熔融Mg液对碳纤维的浸渗.
关键词:
溶胶-凝胶
,
SiO2 coating
,
Carbon fibre
,
Cf/Mg composite
Kun LI
,
Nanlin SHI
,
Jun GONG
,
Chao SUN
,
null
,
null
,
null
,
null
材料科学技术（英文）
Four kinds of Mg alloys reinforced with carbon fibres were fabricated by a gas pressure infiltration technique. The fibres were pre-coated a SiO2 layer prior to fabrication. Different microstructures and interactions in the fibre-matrix interface of these composites were observed by transmission electron microscopy (TEM). The results showed that the interfacial interaction strongly depended on the content of Al in the Mg-based matrices. The microstructure of the interface could then be controlled by adjusting the Al content of the Mg-based matrix. In addition, fibres extracted from different Mg-based matrix all had some degradation owing to the interfacial reaction and the fibre-matrix interdiffusion.
关键词:
Carbon fibre
,
null
,
null
,
null
