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Si-Al固溶对Ti3AlC2陶瓷300℃干摩擦行为的影响
Effects of Si-Al Solid Solution on the Dry Sliding Behaviors of Ti3AlC2 at 300 ℃
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- DOI:
- 作者:
- 曾庆妍 1，2 ，薛垄琦 1，2，3 ，王传超 1，2 ，王金金 1，2 ，杜乘风 1，2，3 ，余 泓 1，2
ZENG Qingyan1,2, XUE Longqi1,2,3, WANG Chuanchao1,2, WANG Jinjin1,2, DU Chengfeng1,2,3, YU Hong1,2
- 作者单位:
- 1. 西北工业大学 凝固技术国家重点实验室，陕西 西安 710072；2. 西北工业大学 先进润滑与密封材料研究中心，陕西 西安 710072；3. 西北工业大学 伦敦玛丽女王工程学院，陕西 西安 710072
1. State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072, China; 2. Center of Advanced Lubrication and Seal Materials, Northwestern Polytechnical University, Xi'an 710072, China; 3. Queen Mary University of London Engineering School, Northwestern Polytechnical University, Xi'an 710072, China
- 关键词:
- MAX 陶瓷；固溶；晶粒尺寸；相组成；干摩擦行为
MAX ceramics; solid solution; grain size; phase composition; dry-sliding behaviors
- 摘要:
- 利用元素粉体热压烧结工艺制备了具有不同 Si 固溶含量的系列 Ti3Al1-xSixC2 (x=0.2、0.4、0.6)陶瓷材料，采
用 X 射线衍射技术及 Rietveld 结构精修对所得产物的结构及相组成进行了分析，利用共聚焦显微镜、扫描电子显
微镜研究了产物的表面形貌和晶粒结构，使用球-盘型摩擦实验机评估了材料的干摩擦行为。 结果表明，Si 的引入极大
细化了 Ti3Al1-xSixC2 陶瓷的晶粒，并降低其相纯度。 随着 Si 加入量的增加，大量 Ti5Si3 和 TiC 杂相出现，Ti3Al1-xSixC2 陶瓷
的硬度逐步提升。 而当 Si 加入量为 0.4 时，所得 Ti3Al0.6Si0.4C2 陶瓷表现出了最低的摩擦系数(COF)，为 0.27，抗磨减摩效
果最好。
Hot-pressing of elemental powders has been applied for preparing a series of Ti3Al1-xSixC2(x=0.2,0.4,0.6) ceramics with different Si contents. The crystal structure and phase composition of the products were characterized by X-ray diffraction and Rietveld refinement. Meanwhile, the surface morphologies and grain distribution were analysed via confocal microscopy and scanning electron microscopy. The tribological performance of the products was evaluated through dry sliding on a tribometer with a ball-on-disk configuration. Consequently, the addition of Si greatly reduces the grain size of Ti3Al1-xSixC2, whereas the purity of the sample decreases as well. The contents of Ti5Si3 and TiC impurities increase with increasing Si content. Meanwhile, the hardness of the ceramics increases with a higher Si addition. With an optimal Si content of 0.4, Ti3Al0.6Si0.4C2 presents the lowest coefficient of friction (COF), which is only approximately 0.27, showing the best lubricating and anti-wear performance.