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is a kind of insulating ceramics with high rigidity and melting point, which has been widely used in the preparation of basin-type insulators [1]. Meanwhile, Al 2 O 3 is one of the most commonly used fillers for composites [2]. Filling nano-Al 2 O 3 can improve the mechanical strength [3-6], thermal stability [7,8], wear resistance [9, 10] and other properties of composite materials, but the improvement of surface insulation performance is not obvious [11,12].

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