Matula Grzegorz, Tomiczek Błażej
Scientific and Didactic Laboratory of Nanotechnology and Material Technologies, Faculty of Mechanical Engineering, Silesian University of Technology, Konarskiego 18a St., 44-100 Gliwice, Poland.
Materials (Basel). 2023 Jul 25;16(15):5210. doi: 10.3390/ma16155210.
This paper describes the combination of surface engineering and powder metallurgy to create a coating with improved corrosion resistance and wear properties. A new method has been developed to manufacture corrosion-resistant surface layers on steel substrate with additional carbide reinforcement by employing a polymer-powder slurry forming and sintering. The proposed technology is an innovative alternative to anti-corrosion coatings applied by galvanic, welding or thermal spraying techniques. Two different stainless-steel powders were used in the research. Austenitic 316 L and 430 L ferritic steel powders were selected for comparison. In addition, to improve resistance to abrasive wear, coatings containing an additional mixture of tetra carbides (WC, TaC, TiC, NbC) were applied. The study investigates the effects of using multicomponent polymeric binders, sintering temperature, and atmosphere in the sintering process, as well as the presence of reinforcing precipitation, microstructure and selected surface layer properties. Various techniques such as SEM, EDS, hardness and tensile tests and corrosion resistance analysis are employed to evaluate the characteristics of the developed materials. It has been proven that residual carbon content and nitrogen atmosphere cause the release of hard precipitations and thus affect the higher mechanical properties of the obtained coatings. The tensile test shows that both steels have higher strength after sintering in a nitrogen-rich atmosphere. Nitrogen contributes over 50% more to the tensile strength than an argon-containing atmosphere.
本文描述了表面工程与粉末冶金相结合的方法，以制备具有改进的耐腐蚀性和耐磨性能的涂层。通过采用聚合物 - 粉末浆料成型和烧结工艺，开发了一种在钢基体上制造具有额外碳化物增强的耐腐蚀表面层的新方法。所提出的技术是一种创新的替代方法，可替代通过电镀、焊接或热喷涂技术施加的防腐涂层。研究中使用了两种不同的不锈钢粉末。选择奥氏体316L和430L铁素体钢粉末进行比较。此外，为了提高耐磨性，还应用了含有碳化物（WC、TaC、TiC、NbC）混合物的涂层。该研究调查了使用多组分聚合物粘合剂、烧结温度和烧结过程中的气氛的影响，以及增强析出物的存在、微观结构和选定的表面层性能。采用扫描电子显微镜（SEM）、能谱分析（EDS）、硬度和拉伸试验以及耐腐蚀性分析等各种技术来评估所开发材料的特性。已经证明，残余碳含量和氮气氛会导致硬析出物的释放，从而影响所获得涂层的更高机械性能。拉伸试验表明，两种钢在富氮气氛中烧结后都具有更高的强度。与含氩气氛相比，氮对拉伸强度的贡献超过50%。
