ZTA颗粒增强铁基复合材料的高温磨料磨损性能研究
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摘要
采用铸渗法制备了0.5~1、1~2、2~3 mm不同粒径ZTA(氧化锆增韧氧化铝)陶瓷颗粒增强的高铬铸铁基复合材料,并研究了基体与复合材料在500、700、900℃高温条件下的磨料磨损性能,结合SEM等手段分析了其磨损机理。结果表明,高铬铸铁在高温磨损作用下,失重量随磨损时间增加先急速增加后逐渐放缓,特别是2~3 mm粒径颗粒增强的复合材料,经过同样的磨损条件,其失重量约是高铬铸铁的1/4;随着实验温度的进一步升高,高铬铸铁在高温高载荷下发生软化,强度硬度降低,磨损量显著增加,但对ZTA性能的影响不大,复合材料的优势越发凸显,900℃条件下复合材料的耐磨性可以达到高铬铸铁的4倍左右。
The high chromium cast iron matrix composites with different sizes 0.5-1, 1-2 and 2-3 mm of ZTA(zirconia toughened alumina) ceramic particles were prepared by casting infiltration method. The abrasive wear properties of the matrix and composite materials at 500 ℃, 700 ℃ and 900 ℃ were studied. The wear mechanism was analyzed by means of SEM and so on. The results show that the weight loss of high chromium cast iron increases rapidly and then slows down with the increase wear time under the action of high temperature wear. Especially the for 2-3 mm particle reinforced composites, the weight loss is about 1/4 of that of high chromium cast iron after the same wear condition. With the further increase of test temperature, the high chromium cast iron softens under high temperature and high load, the strength and hardness decrease,and the wear amount increases significantly. However, the effect on the properties of ZTA is not significant, and the advantages of the composite materials become more prominent. The wear resistance of the composite at 900 ℃ is about 4 times that of the high chromium cast iron.
The high chromium cast iron matrix composites with different sizes 0.5-1, 1-2 and 2-3 mm of ZTA(zirconia toughened alumina) ceramic particles were prepared by casting infiltration method. The abrasive wear properties of the matrix and composite materials at 500 ℃, 700 ℃ and 900 ℃ were studied. The wear mechanism was analyzed by means of SEM and so on. The results show that the weight loss of high chromium cast iron increases rapidly and then slows down with the increase wear time under the action of high temperature wear. Especially the for 2-3 mm particle reinforced composites, the weight loss is about 1/4 of that of high chromium cast iron after the same wear condition. With the further increase of test temperature, the high chromium cast iron softens under high temperature and high load, the strength and hardness decrease,and the wear amount increases significantly. However, the effect on the properties of ZTA is not significant, and the advantages of the composite materials become more prominent. The wear resistance of the composite at 900 ℃ is about 4 times that of the high chromium cast iron.
引文
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