Unlubricated fretting wear of TiB2-containing composites against bearing steel
Unlubricated fretting wear of TiB2-containing composites against bearing steel
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DOI：
10.1007/s11661-002-0257-4
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发表时间：
2002-12
期刊：
影响因子：
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通讯作者：
J. Vleugels;K. Hari Kumar;R. Vitchev;O. Biest;B. Basu
中科院分区：
文献类型：
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作者：
J. Vleugels;K. Hari Kumar;R. Vitchev;O. Biest;B. Basu
在干无润滑条件下(22°C~25°C，50%~55%RH)对块状TiB_2、含Ni3(Al，Ti)粘结剂的TiB_2基金属陶瓷、Sialon-TiB_2和ZrO_2-TiB_2复合材料进行了微动磨损试验，以评价它们与轴承钢的相对磨损性能。基于测量的摩擦磨损数据，建立了所研究的微动副的相对排名。研究发现，所有摩擦副的微动磨损均属于摩擦化学磨损区域。摩擦化学反应的程度强烈地依赖于TiB_2的化学溶解度和钢中摩擦接触处的粘结相，并伴随着摩擦氧化。然而，对于块状TiB_2和TiB_2基金属陶瓷材料，除了摩擦化学反应外，磨损和粘着磨损是造成这些摩擦系统高体积磨损的原因。另一方面，轻微的磨损和减少的摩擦化学反应是造成ZrO2-TiB2/钢微动副低磨损的主要原因。拉曼光谱和X射线光电子能谱(XPS)分析表明，TiB_2/钢摩擦副中形成了以锐钛矿型TiO_2、B_2O_3和Fe_2O_3为主的混合氧化物。在热力学计算和实验观察的基础上，提出了一个摩擦化学磨损模型来解释所研究的摩擦系统的摩擦学行为。
Fretting tests under dry unlubricated conditions (22 °C to 25 °C, 50 to 55 pct RH) were performed on monolithic TiB2, TiB2-based cermet with a Ni3(Al,Ti) binder, sialon-TiB2, and ZrO2-TiB2composites to assess their relative wear performance against bearing-grade steel. Based on the measured friction and wear data, the relative ranking of the investigated fretting couples is established. The fretting wear of all investigated tribocouples was found to fall in the tribochemical wear regime. The extent of the tribochemical reaction was observed to be strongly dependent on the chemical solubility of TiB2and the binder phases in steel at the tribocontacts and was accompanied by tribo-oxidation. For the monolithic TiB2and TiB2-based cermet materials, however, abrasion and adhesive wear, in addition to the tribochemical reactions, are found to be the cause for the high volumetric wear loss of these tribosystems. On the other hand, mild abrasion coupled with reduced tribochemical reactions is observed to play a major role in the low wear loss of the ZrO2-TiB2/steel fretting couple. Raman spectroscopy and X-ray photoelectron spectroscopy (XPS) analysis of the tribochemical layer formed in the monolithic TiB2/steel tribocouple revealed the formation of mixed oxides containing predominantly TiO2(anatase), B2O3, and Fe2O3. Based on the thermodynamic calculations and the experimental observations, a tribochemical wear model is proposed to explain the observed tribological behavior of the investigated tribosystems.