| 霍俊昊,何美凤.六钛酸钾晶须对摩擦材料的影响及磨损机制[J].有色金属材料与工程,2020,41(4):8-16. |
| 六钛酸钾晶须对摩擦材料的影响及磨损机制 |
| Effect of Potassium Hexatitanate Whiskers on Friction Materials and Wear Mechanism |
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| DOI：10.13258/j.cnki.nmme.2020.04.002 |
| 中文关键词: 六钛酸钾晶须 衰退恢复曲线 抗热衰退性 磨损机制 |
| 英文关键词:potassium hexatitanate whisker fade and recovery curve heat fade resistance wear mechanism |
| 基金项目:国家自然科学基金资助项目（51771120） |
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| 中文摘要: |
| 主要研究添加六钛酸钾晶须的摩擦材料的摩擦磨损性能和表面磨损机制。试样中摩擦性能调节剂和改性酚醛树脂等其他材料的含量不变，仅改变六钛酸钾晶须和空间填料硫酸钡的含量，采用JF-645T型热压机压制试样。将制得的试样进行衰退和恢复、剪切强度和硬度等性能测试，场发射扫描电子显微镜（scanning electron microscope, SEM）和能谱仪（energy dispersive spectrometer, EDS）分析材料摩擦表面形貌以及成分。研究发现：六钛酸钾晶须能显著提高材料的摩擦因数（μ）、抗高温衰退性和耐磨性；当材料表面初始凸台被破坏后，适量的六钛酸钾晶须附着于芳纶纤维表面能团聚磨粒和磨屑并促进二次凸台的形成；团聚作用是六钛酸钾晶须在摩擦材料中起到优异性能的根本原因；过量的六钛酸钾晶须（质量分数≥16%）会在混料中直接结团，结团体在接触面剪切力作用下会被轻易拉出表面，增大磨损率。 |
| 英文摘要: |
| The friction properties and surface wear mechanism of potassium hexatitanate whisker friction materials were studied. The samples were pressed in a JF-645T hot press by just changing the contents of potassium hexatitanate whiskers and space filler barium sulfate with the contents of other materials such as friction modifiers and modified phenolic resins unchanged. The fade and recovery, shear strength and hardness of the samples were evaluated. The morphology and composition of the friction surface were analyzed by scanning electron microscope (SEM) and energy dispersive spectrometer (EDS). The results show that the friction coefficient (μ), high temperature decay resistance and wear resistance of the material were significantly improved by potassium hexatitanate whisker. When the initial plateaus on the material surface are damaged, an appropriate amount of potassium hexatitanate whiskers attached to the surface aramid fiber can agglomerate the abrasive particles and debris and promote the formation of the secondary plateaus. Agglomeration is the fundamental reason why potassium hexatitanate whiskers play excellent performance in friction materials. Excessive potassium hexatitanate whiskers (mass fraction ≥16%) will directly agglomerate in the mixture, and the agglomerates will be easily pulled out of the surface under the shearing force of the contact surface resulting in the increase of wear rate. |
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