Sliding wear behaviour of SiC–Al2O3 nanocomposites
Sliding wear behaviour of SiC–Al2O3 nanocomposites
复制标题
DOI：
10.1016/j.wear.2005.02.027
复制
发表时间：
2005-07
期刊：
影响因子：
5
通讯作者：
S. Bajwa;W. M. Rainforth;William E Lee
中科院分区：
文献类型：
--
作者：
S. Bajwa;W. M. Rainforth;William E Lee
陶瓷纳米复合材料，特别是Al_2O_3-SiC纳米复合材料的上级力学性能已被广泛研究。与整体式Al 2 O3相比，其在磨损性能方面具有显著优势，特别是在侵蚀和磨损条件下。纳米复合材料倾向于表现出覆盖在塑性变形凹槽中的表面，而对于相同的条件，整料表现出沿晶断裂。然而，对纳米复合材料的滑动磨损行为进行的研究相对较少，磨损研究没有明确检查与氧化铝中发生的众所周知的时间依赖性磨损转变相关的磨损行为。本文报道了含5，10和15%SiC的SiC-Al_2 O_3复合材料的干滑动磨损性能，并与整体氧化铝作了比较。选择0.24m/s的滑动磨损试验条件和20- 100 N的载荷，以便在最高载荷下，在整体氧化铝中的时间依赖性磨损转变迅速发生，但对于最低载荷，仅在相当长的距离之后发生。在任何载荷下，复合材料都没有观察到随时间变化的磨损转变。整体材料和所有复合材料的转变前比磨损率（0.1 -2×10− 8 mm 3/Nm）相似，这意味着添加SiC并没有显著改变这些材料的轻度磨损机制。然而，所有复合材料的比磨损率都随着滑动距离的增加而降低，SiC含量没有显著影响，与观察到的整体材料的比磨损率显著增加（高达1×10− 6 mm 3/Nm）相反。复合材料的轻度磨损与表面的平滑有关，尽管存在微磨粒凹槽，这似乎是由于偶尔拉出SiC颗粒。磨损机制作为一个功能的组成进行了讨论。
The superior mechanical properties of ceramic nanocomposites, in particular Al2O3–SiC, have been extensively investigated. The significant benefits in wear behaviour compared to monolithic Al2O3have been demonstrated, particularly for erosive and abrasive conditions. Nanocomposites tend to exhibit a surface covered in plastic deformation grooves, while for the same conditions the monolith exhibits intergranular fracture. However, relatively little research has been undertaken on the sliding wear behaviour of nanocomposites, and wear studies have not explicitly examined the wear behaviour in relation to the well known time-dependent wear transition that occurs in alumina. The current work reports the dry sliding wear behaviour of SiC–Al2O3composites with 5, 10 and 15% SiC and compared with monolithic alumina. Sliding wear test conditions of 0.24m/s and loads of 20–100N were chosen in order that the time-dependent wear transition in monolithic alumina occurred rapidly for the highest load, but only after a considerable distance for the lowest load. No time-dependent wear transition was observed for the composites at any load. Pre-transition specific wear rates (∼1–2×10−8mm3/Nm) were similar for monolith and all composite materials, implying the addition of SiC did not substantially modify the mild wear mechanism in these materials. However, specific wear rate decreased with sliding distance for all composites, with no significant effect of SiC content, in contrast to the substantial increases observed for the monolith (up to 1×10−6mm3/Nm). The mild wear of the composites was associated with smoothing of the surface, although microabrasive grooves were present, which appeared to result from occasional pull-out of SiC particles. The wear mechanisms as a function of composition are discussed.