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Microstructural study of HVOF sprayed Ni particles on a grit-blasted stainless-steel substrate
Surface & Coatings Technology ( IF 5.3 ) Pub Date : 2021-01-12 , DOI: 10.1016/j.surfcoat.2021.126832
Musharaf Abbas , Gregory M. Smith , Paul R. Munroe

Ni feedstock particles were sprayed onto a grit-blasted stainless-steel substrate using the high-velocity oxy-fuel (HVOF) deposition process to analyse the flattening behaviour and bonding features of single splats on a roughly textured substrate surface. Both substrate surface features and splat morphologies were analysed through scanning electron microscopy (SEM), while cross-sectional features, including the nature of the splat-substrate interface, were characterised through focused ion beam (FIB) microscopy and transmission electron microscopy (TEM). The chemistry of both the splat and substrate were analysed by energy-dispersive X-ray spectroscopy (EDS) interfaced to both the SEM and TEM. It was observed that despite the surface roughness, fully melted splats demonstrated good flattening performance, as well as efficient bonding, with the substrate surface. Such bonding was revealed through elemental interdiffusion across the splat-substrate interface. The particle size and the location of impact on the rough surface played important roles in defining the melting state, flattening degree and, ultimately, adhesion of the particles. Fully melted splats derived from smaller feedstock particles demonstrated good flattening behaviour, comparable to that observed on polished surfaces. Such particles exhibited better bonding efficiency than the partially melted splats, which originated from relatively larger feedstock particles. The presence of residual alumina contaminants, retained after grit blasting, is also analysed and discussed.



中文翻译:

喷砂不锈钢基体上HVOF喷涂Ni颗粒的显微组织研究

使用高速氧燃料(HVOF)沉积工艺,将Ni原料颗粒喷涂到喷砂处理的不锈钢基材上,以分析单个喷头在粗糙纹理基材表面上的展平行为和结合特征。通过扫描电子显微镜(SEM)分析了基材表面特征和splat形态,同时通过聚焦离子束(FIB)显微镜和透射电子显微镜(TEM)表征了包括splat-基材界面性质在内的横截面特征。 。通过与SEM和TEM相连的能量色散X射线光谱(EDS)分析了splat和基材的化学性质。观察到,尽管表面粗糙,但完全熔化的小片仍表现出良好的展平性能以及有效的粘结,与基材表面。这种结合是通过跨splat-substrate界面的元素相互扩散而揭示的。颗粒大小和在粗糙表面上的撞击位置在定义熔融状态,变平度以及最终颗粒的粘附方面起着重要作用。与较小的原料颗粒相比,完全熔化的短片表现出良好的展平性能,与在抛光表面上观察到的相当。这样的颗粒显示出比部分熔化的碎片更好的结合效率,后者是由相对较大的原料颗粒产生的。还对喷砂后残留的残留氧化铝污染物的存在进行了分析和讨论。颗粒大小和在粗糙表面上的撞击位置在定义熔融状态,变平度以及最终颗粒的粘附方面起着重要作用。与较小的原料颗粒相比,完全熔化的短片表现出良好的展平性能,与在抛光表面上观察到的相当。这样的颗粒显示出比部分熔化的碎片更好的结合效率,后者是由相对较大的原料颗粒产生的。还对喷砂后残留的残留氧化铝污染物的存在进行了分析和讨论。颗粒大小和在粗糙表面上的撞击位置在定义熔融状态,变平度以及最终颗粒的粘附方面起着重要作用。与较小的原料颗粒相比,完全熔化的短片表现出良好的展平性能,与在抛光表面上观察到的相当。这样的颗粒显示出比部分熔化的碎片更好的结合效率,后者是由相对较大的原料颗粒产生的。还对喷砂后残留的残留氧化铝污染物的存在进行了分析和讨论。与在抛光表面上观察到的相当。这样的颗粒显示出比部分熔化的碎片更好的结合效率,后者是由相对较大的原料颗粒产生的。还对喷砂后残留的残留氧化铝污染物的存在进行了分析和讨论。与在抛光表面上观察到的相当。这样的颗粒显示出比部分熔化的碎片更好的结合效率,后者是由相对较大的原料颗粒产生的。还对喷砂后残留的残留氧化铝污染物的存在进行了分析和讨论。

更新日期:2021-01-18
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