ABSTRACT

For shock-absorbing and wear-resistant devices, there is an urgent need for monomer casting nylon (MC nylon) with excellent friction properties and mechanical properties simultaneously. Liquid lubricating oil is known to reduce friction effectively, but it will cause a dramatical decline in the mechanical properties of oil-impregnated monomer casting nylon (OMC nylon). Herein, α-Al₂O₃ nanoparticles modified by γ-aminopropyl triethoxy silane (APTS) were filled into OMC nylon, and the tribological and mechanical properties of APTS-α-Al₂O₃/OMC nylon composite were investigated systematically. Compared with OMC nylon, the addition of 0.1 wt% APTS-α-Al₂O₃ resulted in 19.5% increase in the tensile strength, 33.4% and 29.1% growth in compressive strength and modulus, 30.8% and 33.1% growth in flexural strength and modulus, respectively. Meanwhile, over 44% and 64.8% reduction in the friction coefficient and abrasion quality, respectively, were achieved for the nanocomposite. And the worn surface displayed smooth features, confirming the abrasion resistance of APTS-α-Al₂O₃. Hence, the combination of lubricating oil and α-Al₂O₃ is an appropriate choice when excellent mechanical and tribological properties are required to broaden the application field of MC nylon much further.

摘要

对于减震和耐磨装置，迫切需要同时具有优异的摩擦性能和机械性能的单体浇铸尼龙（MC尼龙）。已知液态润滑油可有效减少摩擦，但会导致油浸单体铸造尼龙（OMC尼龙）的机械性能急剧下降。在本文中，α-Al系_2个ö ₃通过改性的纳米粒子γ氨基丙基三乙氧基硅烷（APTS）填充到OMC尼龙和的摩擦性能和机械性能APTS-的α-Al ₂ ö ₃ / OMC尼龙复合进行了系统的研究。与OMC尼龙，添加0.1重量％的比较APTS-的α-Al ₂ ö ₃导致抗张强度增加19.5％，抗压强度和模量增加33.4％和29.1％，抗弯强度和模量分别增加30.8％和33.1％。同时，该纳米复合材料的摩擦系数和磨损质量分别降低了44％和64.8％。和磨损表面显示平滑的功能，在确认APTS-α-Al系的耐磨性₂ ö ₃。因此，润滑油和α-Al的组合₂ ø ₃是当需要优异的机械和摩擦学特性得多进一步拓宽MC尼龙的应用领域的合适的选择。