碳化硅纳米材料用于盘式刹车片实验：添加0.5%时平均制动力最高提升19%，130摄氏度内抗热衰减
《科学报告》11月14日刊出的一项实验研究显示，在盘式刹车片中加入碳化硅纳米颗粒作为磨料添加剂，可以在实验室测试中提升制动表现。研究比较了四种配方，纳米碳化硅的添加比例分别为0、0.5%、1.5%与3%，所用颗粒尺寸为44纳米。
结果显示，添加0.5%碳化硅的配方改善最为明显：与未改性的刹车片相比，平均制动力最高提升19%，摩擦系数也有所提高。加入碳化硅的样品在高达130摄氏度的温度下表现出更好的热稳定性与抗热衰减能力。研究人员在专用试验台上完成测试，所用刹车盘为标准灰铸铁通风盘，外径241毫米、名义厚度19毫米，规格与2005款 Hyundai Excel 所用刹车盘一致。
研究团队在不同滑动速度、工作温度、制动时间与制动油压条件下，评估了各配方的摩擦与制动表现。作者指出，刹车片的磨损率、摩擦率、冷却率与整体制动性能都取决于其复合材料构成，这正是该研究以纳米碳化硅改性刹车片的原因。
需要说明的是，上述结果来自受控的实验室测试，并非道路实测数据。研究结论指向一个明确的方向：低比例的纳米添加剂可能带来可量化的摩擦与耐热收益，但量产刹车片是否采用此类配方，仍取决于后续的耐久与成本验证。
Silicon Carbide Nanomaterials in Disc Brake Pads: 0.5% Loading Raised Average Brake Force by Up to 19%, With Fade Resistance Up to 130°C
An experimental study published in Scientific Reports on November 14 found that adding silicon carbide nanoparticles to disc brake pads as an abrasive additive can improve braking performance in laboratory testing. The study evaluated four brake pad formulations containing silicon carbide at concentrations of 0, 0.5, 1.5 and 3 weight percent, using particles of 44 nanometres.
The 0.5% formulation achieved the most significant improvement, increasing the average brake force by up to 19% compared with unmodified pads, and enhancing the friction coefficient. The silicon carbide-infused samples also showed superior thermal stability and fade resistance at temperatures up to 130°C, outperforming the other tested formulations under different operating conditions.
Testing was conducted on a specialized rig utilizing a standard grey cast iron ventilated disc with an outer diameter of 241 mm and a nominal thickness of 19 mm, consistent with the specifications of a 2005 Hyundai Excel. The researchers evaluated frictional and braking performance under different sliding speeds, operating temperatures, braking times and brake oil pressures. The authors note that a brake pad's wear rate, friction rate, cooling rate and overall brake performance all depend on its composite material composition.
The findings come from controlled laboratory testing rather than on-road measurement. They point to measurable gains in friction and heat resistance from a low loading of nanoparticle additive, while durability and cost validation would still be needed before any production application.
来源：《科学报告》
发布：GSM·美国（发布链接）
图片来源：图：盘式刹车特写（2020 款 Chevrolet Bolt EV 前制动盘）。作者：4300streetcar，CC BY 4.0，维基共享资源。 / Photo: Close-up of a disc brake (2020 Chevrolet Bolt EV front disc). Credit: 4300streetcar, CC BY 4.0, via Wikimedia Commons.
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