Fabrication and properties of the abradable sealing Al2024/hBN composite by hot-pressing sintering
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摘要: 采用球磨工艺和热压烧结技术制备可磨耗封严Al2024/hBN复合材料,研究了不同球磨时间对复合材料微观组织和力学性能的影响。结果表明,通过球磨和热压烧结技术制备的Al2024/hBN复合材料具有较高的密度和硬度,分别达到2.52 g·cm-3和90 HR15Y以上。随着球磨时间的延长,热压烧结样品微观组织发生显著变化,由颗粒状变为层片组织结构;摩擦系数和体积磨损量分别降低,最低为0.32和2.3×10-3 mm3·m-1·N-1; 室温三点抗弯性能随着球磨时间的延长而增强,三点弯曲力由1.2 kN提高到2.3 kN。
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关键词:
Abstract: Abradable sealing technique has been extensively used to realize the dynamic seal between rotating and stationary parts of the industrial aircraft engines, and it plays an important role in reducing the heat rate and increasing power output. The Al2024/hBN composite has been produced by hot-pressing sintering process, showing a high density of 2.52 g/cm3 and a Rockwell hardness value up to 90 HR15Y. After ball milling for 120h under an argon atmosphere, the composite’s microstructure significantly changes from spherical particle structure to lamellar structure, and the friction coefficient and volume wear rate reduce to 0.32 and 2.3*10-3 mm3/m*N, respectively. The maximum bending force increases from 1.2 kN to 2.3 kN in the three-point bending test at room temperature.-
Key words:
- Al2024/hBN /
- abradable sealing /
- ball milling /
- hot-pressing sintering /
- Rockwell hardness
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