Davin Edouard A T, Cristol Anne-Lise, Beaurain Arnaud, Dufrénoy Philippe, Zaquen Neomy
Univ. Lille, CNRS, Centrale Lille, UMR 9013-LaMcube-Laboratoire de Mécanique, Multiphysique, Multi-échelle, F-59000 Lille, France.
LAPINUS, ROCKWOOL BV, Delfstoffenweg 2, 6045 JH Roermond, The Netherlands.
Materials (Basel). 2021 Sep 24;14(19):5531. doi: 10.3390/ma14195531.
In this study, through severe reduced-scale braking tests, we investigate the wear and integrity of organic matrix brake pads against gray cast iron (GCI) discs. Two prototype pad materials are designed with the aim of representing a typical non-metal NAO and a low-steel (LS) formulation. The worn surfaces are observed with SEM. The toughness of the pad materials is tested at the raw state and after a heat treatment. During braking, the LS-GCI disc configuration produces heavy wear. The friction parts both keep their macroscopic integrity and wear appears to be homogeneous. The LS pad is mostly covered by a layer of solid oxidized steel. The NAO-GCI disc configuration wears dramatically and cannot reach the end of the test program. The NAO pad suffers many deep cracks. Compacted third body plateaus are scarce and the corresponding disc surface appears to be very heterogeneous. The pad materials both show similar strength at the raw state and similar weakening after heat treatment. However, the NAO material is much more brittle than the LS material in both states, which seems to favor the growth of cracks. The observations of crack faces suggest that long steel fibers in the LS material palliate the brittleness of the matrix, even after heat damage.
在本研究中，通过严格的缩尺制动试验，我们研究了有机基体刹车片与灰铸铁（GCI）盘之间的磨损及完整性。设计了两种原型刹车片材料，旨在分别代表典型的非金属无石棉有机（NAO）配方和低钢（LS）配方。通过扫描电子显微镜（SEM）观察磨损表面。在原始状态和热处理后测试刹车片材料的韧性。制动过程中，LS-GCI盘配置产生严重磨损。摩擦部件均保持其宏观完整性，磨损似乎是均匀的。LS刹车片大部分被一层固态氧化钢覆盖。NAO-GCI盘配置磨损严重，无法完成测试程序。NAO刹车片出现许多深裂纹。压实的第三体平台很少，相应的盘表面显得非常不均匀。两种刹车片材料在原始状态下表现出相似的强度，热处理后也有相似程度的弱化。然而，在两种状态下，NAO材料都比LS材料脆得多，这似乎有利于裂纹的扩展。裂纹面的观察表明，即使在热损伤后，LS材料中的长钢纤维也能减轻基体的脆性。
