Dry sliding wear behavior of Al-based composites fabricated by exothermic dispersion reaction in an Al-ZrO2-C system

作者：Zhu H G^*; Ai Y L; Min J; Wu Q; Wang H Z

来源：Wear, 2010, 268(11-12): 1465-1471.

DOI：10.1016/j.wear.2010.02.023

• Sliding wear
• Sliding friction
• Metal-matrix composite
• Wear

In situ Al-based composites were fabricated by exothermic dispersion method. Dry sliding wear results showed that the original C/ZrO2 mole ratio is a key factor to the wear behavior of the composites. When the ratio of C/ZrO2 = 0, the reinforcements are mainly composed of Al3Zr particles and alpha-Al2O3 particles, and it is suggested that the dominant wear mechanism is abrasive wear. The wear resistance of the composites is not satisfactory due to the low mechanical strength and brittleness of the Al3Zr phase. When the C/ZrO2 ratio increases from 0 to 1, the wear resistance is significantly improved by the increased volume fraction of alpha-Al2O3 and decreased volume fraction of Al3Zr, plus newly formed nanosized ZrC particles. Moreover, experimental results showed that the mass loss of the composites linearly increases with the sliding distance. The wear rates decrease with the increment of the sliding velocity, but increase with the C/ZrO2 mole ratios. When the C/ZrO2 mole ratio is increased, the friction coefficients of the composites reduce, and the wear surface becomes smoother. When the C/ZrO2 = 1, the produced ceramic reinforcements are composed of nanoscaled alpha-Al2O3 phase and ZrC phase, without Al3Zr phase. Under this circumstance, it is proposed that the adhesive wear becomes the predominant, and the composites have the best wear resistance and friction properties.

• 出版日期2010-5-12
• 单位南京理工大学