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摘要: 通过化学气相渗透法(CVI)结合反应熔体浸渗法(RMI)制备了低成本、高性能的三维针刺C/SiC摩擦材料，并对材料的组织结构、拉伸行为以及拉伸后的微结构进行了分析和研究。结果表明，材料由C、Si以及SiC等三种物相组成，密度约为2.1g/cm3，开气孔率约为4.4%；材料的拉伸强度约为114MPa~154MPa，弹性模量约为40GPa~63GPa；具有类似于金属的“塑性”，其增韧机理主要有纤维拔出、界面脱粘、裂纹偏转、纤维桥联以及裂纹分叉等。
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关键词:
- C/SiC,摩擦材料,微结构,拉伸性能
Abstract: Cost effective and high performance 3D needled carbon/silicon carbide friction materials were prepared by a combination of chemical vapor infiltration and reactive melt infiltration. The microstructures and tensile properties of the composites were studied. Results indicated that the composites consisted of carbon, silicon and silicon carbide. The density and porosity of the composites were about 2.1g·cm-3 and 4.4% respectively, and the tensile strength and Young’s modulus were about 114-154MPa and 40-63GPa respectively. The composites exhibited excellent pseudo-plastic behavior similar to that of metal. The main toughening mechanism of the as-prepared composites was fiber pull-out, interfacial debonding, deflection of cracks, bridging of fibers and bifurcation of cracks. -
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