Toughening Fe-based Amorphous Coatings by Reinforcement of Amorphous Carbon.
Toughening Fe-based Amorphous Coatings by Reinforcement of Amorphous Carbon.
复制标题
非晶碳增强增韧铁基非晶涂层
DOI：
10.1038/s41598-017-04504-z
复制
发表时间：
2017-06-22
影响因子：
4.6
通讯作者：
Liu L
中科院分区：
文献类型：
--
作者：
Wang W;Zhang C;Zhang ZW;Li YC;Yasir M;Wang HT;Liu L
在保持良好耐腐蚀性的同时对铁基非晶涂层进行增韧仍然具有挑战性。这项工作报道了一种新方法，该方法通过原位形成非晶碳增强相来提高FeCrMoCBY非晶涂层的韧性，且不降低其耐腐蚀性。采用高速氧燃料（HVOF）热喷涂技术，使用预混合的铁基非晶/尼龙 - 11聚合物原料粉末制备铁基复合涂层。在热喷涂过程中，尼龙 - 11粉末原位碳化形成非晶碳相，其均匀分布在非晶基体中，从而显著提高了涂层的韧性。通过一系列力学测试技术对包括硬度、抗冲击性、弯曲和疲劳强度在内的力学性能进行了广泛研究。结果表明，由非晶碳相增强的复合涂层比单一非晶涂层具有更强的抗冲击性，疲劳强度几乎提高了一倍。冲击韧性和疲劳性能的提高归因于软质非晶碳相的缓冲作用，它缓解了应力集中并降低了裂纹扩展驱动力。
Toughening of Fe-based amorphous coatings meanwhile maintaining a good corrosion resistance remains challenging. This work reports a novel approach to improve the toughness of a FeCrMoCBY amorphous coating throughin-situformation of amorphous carbon reinforcement without reducing the corrosion resistance. The Fe-based composite coating was prepared by high velocity oxy-fuel (HVOF) thermal spraying using a pre-mixed Fe-based amorphous/nylon-11 polymer feedstock powders. The nylon-11 powders werein-situcarbonized to amorphous carbon phase during thermal spraying process, which homogeneously distributed in the amorphous matrix leading to significant enhancement of toughness of the coating. The mechanical properties, including hardness, impact resistance, bending and fatigue strength, were extensively studied by using a series of mechanical testing techniques. The results revealed that the composite coating reinforced by amorphous carbon phase exhibited enhanced impact resistance and nearly twice-higher fatigue strength than that of the monolithic amorphous coating. The enhancement of impact toughness and fatigue properties is owed to the dumping effect of the soft amorphous carbon phase, which alleviated stress concentration and decreased crack propagation driving force.