MWCNT/HDPE nanocomposite spur gears prepared in concentrations of 0, 0.5, 1, 1.5, 2, and 2.5% by weight using centrifugal ball milling dispersion method followed by CNC milling. SEM examination revealed a sound dispersion of the MWCNT in the HDPE matrix until 2 wt.%. Nanocomposites exhibited higher decomposition temperature and thermal stability than neat HDPE. Yield strength increased linearly in nanocomposites up to 2 wt.%, and then it saturated. Nanofillers' addition steadily increased the young’s modulus up to a weight fraction of 1.5 %, surging rapidly between 1.5 to 2 wt.%. In contrast, its rate of increase declined between 2 and 2.5 wt.%. The Taber abrasion test showed a reduction in wear loss of nanocomposites. The nanocomposites' toughness increased between 0 (neat HDPE) and 1.5 wt.% of MWCNT but declined at higher concentrations due to transition from ductile to brittle nature. At a torque of 5 N-m, the wear performance increased consistently with the increase in the concentration of nanofillers. At 10 N-m, 2.5 wt.% nanocomposite gears displayed a decline due to the increased brittleness. Satisfactory dispersion and developed interphase fervently contributed to the load transfer and mechanical properties. Nanofillers improved the wear resistance, hardness, and lowered plastic deformation. The gear damage mechanism changed from thermal bending to tooth cracking and deflection in the nanocomposite gears. The 2 wt.% MWCNT/HDPE nanocomposites emerged as potential gearing materials with enhanced hardness, tensile properties, uniform dispersion, thermal stability, wear performance, and reasonable toughness.

MWCNT / HDPE纳米复合正齿轮采用离心球磨分散法制备，浓度为0、0.5、1、1.5、2和2.5％（重量），然后进行CNC研磨。SEM检查显示出MWCNT在HDPE基质中的声音分散直至2重量％。纳米复合材料比纯HDPE具有更高的分解温度和热稳定性。在纳米复合材料中，屈服强度线性增加至2 wt。％，然后达到饱和。纳米填料的添加稳定地增加了杨氏模量，直至重量分数达到1.5％，在1.5至2 wt。％之间迅速上升。相反，其增加率降低了2-2.5重量％。泰伯磨损试验表明，纳米复合材料的磨损减少了。纳米复合材料的韧性在0（纯HDPE）和1.5 wt。％之间增加。MWCNT的％，但是由于从韧性转变为脆性而在较高浓度下下降。在5 Nm的扭矩下，磨损性能随着纳米填料浓度的增加而一致地提高。在10Nm时，由于脆性增加，所以2.5重量％的纳米复合齿轮显示出下降。令人满意的分散性和发达的相间促进了载荷传递和机械性能。纳米填料改善了耐磨性，硬度并降低了塑性变形。齿轮的损坏机理从纳米复合齿轮的热弯曲变为齿裂和挠曲。2 wt。％MWCNT / HDPE纳米复合材料是潜在的齿轮材料，具有增强的硬度，拉伸性能，均匀分散性，热稳定性，耐磨性和合理的韧性。