Alumina-silicon carbide (Al₂O₃–SiC) composites of varying compositions (15, 20, 25 and 30 vol.%)–SiC were produced by the ball milling of Al₂O₃ and SiC powders, followed by spark plasma sintering. The samples were sintered at a temperature and pressure of 1600 °C and 50 MPa, respectively, thermally etched at 1400 °C and mechanically fractured by hammer impact. The effect of SiC additions to monolithic Al₂O₃ on the densification response, microstructural and phase evolutions, and fracture morphologies were evaluated. The wear performance of the composites using a ball-on-sample configuration was evaluated and compared to that of monolithic Al₂O₃. In addition, the corrosion performance of the composites in a 3.5% NaCl solution was examined using open circuit potential and potentiodynamic polarization assessments. SiC additions to monolithic Al₂O₃ delayed densification due to the powder agglomeration resulting from the powder processing. SiC particles were observed to be located inside Al₂O₃ grains and some at grain boundaries. Intergranular and transgranular fracture modes were observed on the fractured composite surfaces. The study has shown that the Al₂O₃–SiC composite is a promising material for improved wear resistance with SiC content increments higher than 15 vol.%. Moreover, the increase in SiC content displayed no improvement in corrosion performance.

中文翻译：

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添加超细SiC对SPS烧结生产氧化铝-碳化硅复合材料腐蚀和磨损性能的影响

通过对Al ₂ O ₃和SiC粉末进行球磨，然后进行电火花等离子烧结，生产出不同成分（15、20、25和30％（体积））-SiC的氧化铝-碳化硅（Al ₂ O ₃ -SiC）复合材料。分别在1600°C和50 MPa的温度和压力下烧结样品，在1400°C进行热蚀刻，并通过锤击机械断裂。评估了将SiC添加到整体式Al ₂ O _3中对致密化响应，微观结构和相演变以及断裂形态的影响。评价了使用样品球结构的复合材料的磨损性能，并将其与整体式Al ₂ O ₃的磨损性能进行了比较。。另外，使用开路电势和电位动力学极化评估检查了复合材料在3.5％NaCl溶液中的腐蚀性能。由于由粉末加工导致的粉末团聚，向整体式Al ₂ O _3中添加SiC延迟了致密化。观察到SiC颗粒位于Al ₂ O ₃晶粒内部，并且一些位于晶界。在断裂的复合材料表面观察到晶间和跨晶断裂模式。研究表明，Al ₂ O ₃–SiC复合材料是一种改善耐​​磨性的有前途的材料，其SiC含量的增加量高于15 vol。％。而且，SiC含量的增加没有显示出腐蚀性能的改善。