【摘要】 通过化学气相沉积方法在氧化铝颗粒表面分别获得了Ni、TiN涂层.用不同涂层的氧化铝颗粒制备了氧化铝颗粒/耐热钢基复合材料,考察了复合材料在900℃下的磨料磨损抗力,结果表明:包Ni氧化铝复合材料的耐磨性是耐热钢的3 27倍,包TiN氧化铝复合材料的耐磨性是耐热钢的2 66倍.进一步的分析表明,包Ni氧化铝与耐热钢的界面结合强度可由无涂层时的0 67MPa提高到4 05MPa,而包TiN氧化铝与耐热钢的界面结合强度只提高到1 80MPa.较低的界面结合强度会导致氧化铝颗粒整体从基体中脱落,而包TiN氧化铝/耐热钢基复合材料的界面抗高温氧化性较差,也导致氧化铝颗粒易从基体中脱落,这两方面的作用是导致包TiN氧化铝复合材料高温磨料磨损抗力低的主要原因.更多还原

【Abstract】 The heatresistant steel (HRS) matrix composites reinforced by alumina particles coated with Ni and TiN respectively by means of chemical vapor deposition method are fabricated. The abrasive resistance of the composites at 900 ℃ is investigated. The results show that the abrasive resistance of the composite with Ni coated alumina is as 327 times as that of HRS,and the abrasive resistance of the composite with TiN coated alumina is as 266 times as that of HRS.Further study reveals that the interfacial strength between HRS and Ni coated alumina reaches 405 MPa instead of 180 MPa of TiN coated one, compared with 067 MPa of the bare alumina. The alumina particles coated with Ni do not drop out easily from matrix.更多还原