Abstract:

Cu-10vol%C powder mixture was fabricated by Mechanical Alloy (MA) technology, nano-sized γ-Al₂O₃ grains (average size 12 nm) were synthesized by sol-gel-sintered technology and nano-sized Al₂O₃ particles reinforced Cu-C matrix composites were fabricated by Spark Plasma Sintering (SPS) method. The crystalline structure of powders and size of Al₂O₃ particles were determined by X-ray diffraction. The morphologies of wear surfaces were observed by SEM particles. The dry sliding wear test is carried out on MG-2000 high-temperature wear tester to research tribological properties of composites prepared. The results show that the volume fraction and applied load have significant influence on as-fabricated composites. As the volume fraction of nano-sized Al₂O₃ particles increases from 0 % to 2 %, the abrasion mass of as-fabricated composites decreases from 6.2 mg to 2.1 mg.

Key words: composites, nano-sized Al₂O₃, Cu-C solid solution, tribological property