Abstract—

Nickel-based self-fluxing materials Ni–0.5C–15Cr–3.2Si–2B (PGSR-2) and Ni–1C–17Cr–4.1Si–3.6B (PGSR-4) are studied theoretically and experimentally. These materials are widely used to form wear-resistant coatings on various parts of machines and mechanisms, which are deposited by flame spraying, plasma spraying, and surfacing. To study the relation between the structures and properties and the main technological parameters is of interest to solve applied and theoretical problems. In addition, information on the structure of liquid alloys is necessary for designing and optimizing the deposition of gas-thermal coatings, since heat treatment of a melt can strongly affect the properties of solidified materials. One of the effective ways to solve this problem is the use of computer simulation methods. Thermodynamic simulation of the equilibrium compositions of the self-fluxing materials is carried out. When PGSR-2 and PGSR-4 are uniformly heated, Ni, Cr, C, Ni₃B, Ni₂B, NiB, Ni₂Si, NiSi, CrB, and CrSi are shown to form in a condensed phase. In addition, when PGSR-4 is heated, Cr₅B₃, CrB₂, and Cr₃C₂ form in a condensed phase along with the above components. The microhardness and microstructure of the coatings deposited by plasma spraying are experimentally studied. The PGSR-2 coating is shown to be characterized by the presence of porosity across the thickness, and pores have an irregular shape and sizes from a few microns to 100 μm, and the PGSR-4 powder coating is characterized by a high density, low porosity, and an even boundary with the substrate. The microhardness of PGSR-4 coating is significantly higher than that of PGSR-2, and the microhardness of both coatings is on average 3.0–4.0 times higher than that of the base.

中文翻译：

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镍基自熔材料的理论与实验研究

摘要-

从理论和实验上研究了镍基自熔材料Ni–0.5C–15Cr–3.2Si–2B（PGSR-2）和Ni–1C–17Cr–4.1Si–3.6B（PGSR-4）。这些材料被广泛用于在机器和机构的各个部分上形成耐磨涂层，这些涂层通过火焰喷涂，等离子喷涂和堆焊沉积。研究结构和性能与主要技术参数之间的关系对于解决应用和理论问题具有重要意义。另外，关于液态合金结构的信息对于设计和优化气热涂层的沉积是必不可少的，因为对熔体的热处理会严重影响固化材料的性能。解决此问题的有效方法之一是使用计算机仿真方法。对自熔材料的平衡组成进行热力学模拟。均匀加热PGSR-2和PGSR-4时，Ni，Cr，C，Ni_在图3B中，示出了Ni ₂ B，NiB，Ni ₂ Si，NiSi，CrB和CrSi以凝聚相形成。另外，当加热PGSR-4时，Cr ₅ B ₃，CrB ₂和Cr ₃ C ₂与上述组分一起以凝结形式形成。对通过等离子喷涂沉积的涂层的显微硬度和显微结构进行了实验研究。PGSR-2涂层的特点是在整个厚度上都有孔隙，孔的形状和大小从数微米到100μm不规则，而PGSR-4粉末涂层的特点是高密度，低孔隙率和与基材的均匀边界。PGSR-4涂层的显微硬度明显高于PGSR-2，两种涂层的显微硬度平均比基础涂层高3.0-4.0倍。