Metallic coatings are often applied on steel tubes in power generation boilers to improve their performance and extend the lifetime. Besides the high-temperature corrosion and erosion protection, the coatings should manifest good adhesion and cohesion strength, and relatively low residual stresses. In this study, three processing techniques: high velocity oxygen fuel spraying (HVOF), atmospheric plasma spraying (APS), and direct laser cladding were employed to obtain novel NiCr-Re and NiCr-Re-Al₂O₃ coatings intended for application in combustion boilers. The main objective was to assess the suitability of these three techniques to deposit NiCr-Re and NiCr-Re-Al₂O₃ composite coatings on a 16Mo3 steel substrate. For this purpose, a comparative analysis of the coatings behavior in selected tests was conducted. Of the three processing techniques, thermal spraying by HVOF turned out to be the optimum choice for the studied coatings. From among several variants of the HVOF-sprayed coatings, namely NiCr+1%Re, NiCr+2%Re, NiCr+1%Re+5%Al₂O₃, and NiCr+1%Re+10%Al₂O₃ (all vol.%), the NiCr+1%Re material exhibited the lowest extent of cracking in the disk bend test, the highest tensile strength (405 MPa) in the in-plane tension test, the highest Vickers hardness (379 HV2), the lowest specific wear rate (2.23·10^-4 mm³/N m), and the lowest level of average residual tensile stress (120 MPa).

金属涂层通常应用于发电锅炉的钢管上，以提高其性能并延长使用寿命。除了高温腐蚀和冲蚀保护外，涂层还应表现出良好的附着力和内聚强度，以及相对较低的残余应力。在这项研究中，三种加工技术：高速氧燃料喷涂 (HVOF)、大气等离子喷涂 (APS) 和直接激光熔覆被用来获得新的 NiCr-Re 和 NiCr-Re-Al ₂ O ₃涂层，用于在燃烧锅炉。主要目的是评估这三种技术沉积 NiCr-Re 和 NiCr-Re-Al ₂ O _{3的适用性}16Mo3 钢基材上的复合涂层。为此，对选定测试中的涂层行为进行了比较分析。在这三种加工技术中，HVOF 热喷涂被证明是研究涂层的最佳选择。来自 HVOF 喷涂涂层的几种变体，即 NiCr+1%Re、NiCr+2%Re、NiCr+1%Re+5%Al ₂ O ₃和 NiCr+1%Re+10%Al ₂ O ₃ (all vol.%)，NiCr+1%Re 材料在圆盘弯曲试验中表现出最低程度的开裂，在平面拉伸试验中表现出最高的抗拉强度 (405 MPa)，最高的维氏硬度 (379 HV2) ，最低比磨损率（2.23·10 ^-4 mm ³/N m)，平均残余拉应力的最低水平（120 MPa）。