Abstract The effects of the binder resin and potassium titanate components of brake linings on the amounts of particulate matter (PM) emitted during brake applications were investigated. The studied lining specimens contained phenolic resins with different molecular weights and potassium titanate whiskers and granules. Brake emission tests were performed using a Krauss-type brake tester enclosed within a ventilated chamber, and the PM concentration was measured by an optical particle counter. The obtained results showed that the airborne PM produced during brake applications had a unimodal particle size distribution with a peak centered at approximately 2.5 μm regardless of the lining composition. However, the wear particles settled inside the chamber were composed of agglomerated ultrafine particles, suggesting their further possible resuspension as airborne ones. The linings fabricated from the high-molecular-weight resin and granular potassium titanate exhibited low brake emissions, and the PM reduction observed for granular potassium titanate was greater at higher temperatures due to the facilitation of contact plateau formation on the lining surface.

中文翻译：

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酚醛树脂平均分子量和钛酸钾形貌对刹车颗粒排放的影响

摘要 研究了制动衬片的粘合剂树脂和钛酸钾成分对制动应用过程中排放的颗粒物 (PM) 量的影响。所研究的内衬试样含有不同分子量的酚醛树脂和钛酸钾晶须和颗粒。使用封闭在通风室内的克劳斯型制动测试仪进行制动排放测试，并通过光学粒子计数器测量 PM 浓度。获得的结果表明，在制动应用过程中产生的空气悬浮颗粒物具有单峰粒径分布，峰值集中在大约 2.5 μm，而与衬里成分无关。然而，沉积在腔室内的磨损颗粒是由超细颗粒团聚而成的，表明它们进一步可能作为空中悬浮物重新悬浮。由高分子量树脂和粒状钛酸钾制成的衬里表现出较低的制动排放，并且在较高温度下观察到颗粒状钛酸钾的 PM 减少更大，这是由于衬里表面上形成接触平台的促进作用。