Tribological study on a novel wear-resistant AlMgB14-Si composite
Tribological study on a novel wear-resistant AlMgB14-Si composite
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新型耐磨AlMgB14-Si复合材料的摩擦学研究
DOI：
10.1016/j.ceramint.2017.06.102
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发表时间：
2017-10-15
影响因子：
5.2
通讯作者：
Liu, Weimin
中科院分区：
文献类型：
--
作者：
Chen, Jiao;Cheng, Jun;Liu, Weimin
AIMgB（14）基复合材料是一种很有前途的刀具材料。在这方面，摩擦学性能是所有指标中最重要的性能之一。采用放电等离子烧结法制备了AlMgB 14 - 30wt%Si复合材料（简称BMAS 30）。在不同的摩擦副材料（316 L和Si 3 N4）和载荷下，考察了其在环境中的摩擦学性能。此外，还测定了其断裂韧性和硬度。BMAS 30具有良好的断裂韧性（5.90 MPa m（1/2））和超高硬度（27 GPa）。在摩擦学性能方面，BMAS 30在与316 L摩擦时表现出良好的摩擦学性能，即，较低的摩擦系数为0.19-0.28，磨损率为7.00-8.00 x 10（-6）mm（3）/N m，而与Si 3 N4滑动时，摩擦系数较高，为0.35-0.46，磨损率为3.80-9.00 x 10（-5）mm（3）/N m。前者在磨损表面形成大量的Si颗粒脱出坑，储存磨屑，有利于降低摩擦磨损;后者在高Hertz接触应力下产生严重的疲劳断裂，加剧摩擦磨损。
AIMgB(14) based composites are promising candidates for use as cutting tool etc. In this respect, tribological behavior is one of the most important performances among all the criteria. In this work, a novel AlMgB14-30 wt % Si composite (referred to as BMAS30) was prepared by Spark Plasma Sintering. and its tribological property was investigated under different counterface materials (316 L and Si3N4) and loads in ambient environment. Besides, the fracture toughness and the hardness were measured. We found that BMAS30 has a good fracture toughness of 5.90 MPa m(1/2) and a super-high hardness of 27 GPa. In terms of the tribological properties, BMAS30 shows good tribological properties when sliding against 316 L, i.e., a lower friction coefficient of 0.19-0.28 and wear rate of 7.00-8.00 x 10(-6) mm(3)/N m, while it presents a relatively high friction coefficient of 0.35-0.46 and wear rate of 3.80-9.00 x 10(-5) mm(3)/N m when sliding against Si3N4. In the former case, large numbers of Si grains pull-out pits formed on the worn surface that can store wear debris, which is conducive to lower the friction and wear; the latter produces severe fatigue fracture under high Hertz contact stress and thereby aggravates the friction and wear.