This study investigates the efficiency of recovered brown alumina (RBA) particles filled in epoxy glass-fiber composites. The RBA particles were obtained from grinding wheel rejects with the help of the mechanical crushing process. Recovered particles finer than 120 grit were used as particulate filler for composite preparation. Composites were processed through a hand-layup technique by varying RBA filler loading percentages (0, 5, 10, 15, and 20 wt.%) in a glass fiber–reinforced epoxy matrix. Physical, mechanical, water absorption, and thermal properties of the composites were tested experimentally. By suitable addition of RBA, it is possible to tailor the shore-D hardness, tensile modulus, flexural strength, flexural modulus, and maximum degradation temperature. The 20%-filled RBA composite shows the maximum flexural strength of 382 MPa, and the shore-D hardness value was 85. The fracture surface shows a failure mechanism dominated by matrix cracking and debonding of fiber/particles from the interface. Hygrothermal testing of the RBA20-filled composite reveals 9% and 4% reduction in tensile and flexural properties. The thermal stability of the glass fiber–reinforced composite improves as the filler percentage increases. Maximum thermal stability of 435°C was observed in 20%-filled RBA polymer composite.

本研究调查了填充在环氧玻璃纤维复合材料中的回收棕色氧化铝 (RBA) 颗粒的效率。RBA 颗粒是在机械破碎过程的帮助下从砂轮废料中获得的。回收的小于 120 粒度的颗粒用作复合材料制备的颗粒填料。通过改变玻璃纤维增​​强环氧树脂基质中的 RBA 填料填充百分比（0、5、10、15 和 20 重量%），通过手工铺层技术加工复合材料。通过实验测试了复合材料的物理、机械、吸水性和热性能。通过适当添加 RBA，可以定制肖氏 D 硬度、拉伸模量、弯曲强度、弯曲模量和最大降解温度。20% 填充的 RBA 复合材料的最大弯曲强度为 382 MPa，肖氏硬度值为 85。断裂面显示出以基体开裂和纤维/颗粒从界面脱粘为主的破坏机制。RBA20 填充复合材料的湿热测试显示拉伸和弯曲性能分别降低 9% 和 4%。玻璃纤维增​​强复合材料的热稳定性随着填料百分比的增加而提高。在 20% 填充的 RBA 聚合物复合材料中观察到 435°C 的最大热稳定性。