新型耐热耐磨高速电弧喷涂丝材的研究
发布时间：2018-11-26 15:41
【摘要】：利用高速电弧喷涂制备耐热耐磨涂层对锅炉受热面进行防护具有明显的优势。然而目前在工程中为避免喷涂层开裂和剥落问题,通常采用Ni-Mo或Ni-Al合金打底加耐热耐磨工作层的喷涂工艺。从而使得材料成本较高和施工工艺比较复杂。本文针对此问题,设计并分别试制了Fe/Cr系、Fe BCrAlNi/B_4C系、FeCrBSi(Mo/W)系、FeCrMoWCuNiAl(Co)/B_4C系等四类铁基粉芯丝材。采用高速电弧喷涂设备对其直接在Q235基材上进行喷涂。试验结果表明:四类丝材所制备的涂层均成型良好,宏观无裂纹和剥落现象。为探究涂层成分、组织与性能之间的关系,对涂层的硬度、抗热震性能、耐高温氧化性能、耐摩擦及冲蚀磨损性能进行了测试,并运用光学显微镜、扫描电子显微镜(SEM)及附属能谱仪(EDS)、X射线衍射仪(XRD)、同步热分析仪等测试手段等对涂层组织、成分进行了分析。研究表明,所有涂层均呈良好的典型层状结构。Fe/Cr系金属涂层的平均硬度在503.60~594.56 HV_(0.1)之间,其涂层的硬度和抗氧化性能随Cr含量增加而提高。其中Cr含量为25%的Fe/Cr系涂层抗高温氧化性能最好。在FeBCrAlNi/B_4C系中,B_4C可显著提高其涂层硬度。当B_4C含量由0%添加至6%时,涂层平均硬度从786.82 HV_(0.1)上升至1006.58 HV_(0.1)。但当B_4C含量增加到9%时,发现涂层硬度下降为741.45 HV_(0.1)。该类涂层均表现出较好的抗热震性能和耐高温冲蚀磨损性能。在FeCrBSi(Mo/W)系涂层中均发现存在一定量的非晶相,涂层平均硬度在646.95~910.37 HV_(0.1)之间,其中FeCrBSiW(WC)涂层组织最为致密,非晶相含量最高为24%,晶化温度为513.9℃,平均硬度最高。说明FeCrBSiW在喷涂条件下非晶形成能力较强。且其抗热震性能、耐滑动摩擦及高温冲蚀磨损性能较好。但该系涂层抗高温氧化性能较低。所试验的FeCrMoWCuNiAl类高熵合金复合涂层硬度均较低,在415.87~685.29 HV_(0.1)之间。并且热震性能和抗高温氧化性能较差。
[Abstract]:The heat resistant and wear resistant coating prepared by high speed arc spraying has obvious advantages in the protection of boiler heating surface. However, in order to avoid cracking and spalling of coating in engineering, Ni-Mo or Ni-Al alloy is usually used to underlay and heat resistant working layer. As a result, the material cost is high and the construction process is more complicated. In order to solve this problem, four kinds of iron-base powder core wires such as Fe/Cr system, Fe BCrAlNi/B_4C system, FeCrBSi (Mo/W) system, FeCrMoWCuNiAl (Co) / BSP 4C system are designed and manufactured respectively in this paper. High-speed arc spraying equipment was used to spray Q235 substrate directly. The experimental results show that the coatings prepared by the four kinds of wires are well formed, and there is no crack and exfoliation in macroscopic. In order to explore the relationship between the composition, microstructure and properties of the coating, the hardness, thermal shock resistance, high temperature oxidation resistance, friction resistance and erosion wear resistance of the coating were tested, and the optical microscope was used. The microstructure and composition of the coating were analyzed by means of scanning electron microscope (SEM) and (EDS), X ray diffractometer (XRD),). The results show that all the coatings have a typical layered structure. The average hardness of Fe/Cr coatings is between 503.60 and 594.56 HV_, and the hardness and oxidation resistance of the coatings increase with the increase of Cr content. The Fe/Cr coating with 25% Cr content has the best oxidation resistance at high temperature. In the FeBCrAlNi/B_4C system, the hardness of the coating can be significantly increased by Bs4C. The average hardness of the coating increased from 786.82 HV_ (0.1) to 1006.58 HV_ (0.1) when the content of B _ 4C was increased from 0% to 6%. However, the hardness of the coating decreased to 741.45 HV_ (0. 1) when the content of B _ 4 C increased to 9. The coatings show good thermal shock resistance and high temperature erosion wear resistance. A certain amount of amorphous phase was found in FeCrBSi (Mo/W) coating. The average hardness of the coating was between 646.95 and 910.37 HV_ (0.1). The microstructure of FeCrBSiW (WC) coating was the most compact, and the content of amorphous phase was 24%. The crystallization temperature is 513.9 鈩，
本文编号：2358967
[Abstract]:The heat resistant and wear resistant coating prepared by high speed arc spraying has obvious advantages in the protection of boiler heating surface. However, in order to avoid cracking and spalling of coating in engineering, Ni-Mo or Ni-Al alloy is usually used to underlay and heat resistant working layer. As a result, the material cost is high and the construction process is more complicated. In order to solve this problem, four kinds of iron-base powder core wires such as Fe/Cr system, Fe BCrAlNi/B_4C system, FeCrBSi (Mo/W) system, FeCrMoWCuNiAl (Co) / BSP 4C system are designed and manufactured respectively in this paper. High-speed arc spraying equipment was used to spray Q235 substrate directly. The experimental results show that the coatings prepared by the four kinds of wires are well formed, and there is no crack and exfoliation in macroscopic. In order to explore the relationship between the composition, microstructure and properties of the coating, the hardness, thermal shock resistance, high temperature oxidation resistance, friction resistance and erosion wear resistance of the coating were tested, and the optical microscope was used. The microstructure and composition of the coating were analyzed by means of scanning electron microscope (SEM) and (EDS), X ray diffractometer (XRD),). The results show that all the coatings have a typical layered structure. The average hardness of Fe/Cr coatings is between 503.60 and 594.56 HV_, and the hardness and oxidation resistance of the coatings increase with the increase of Cr content. The Fe/Cr coating with 25% Cr content has the best oxidation resistance at high temperature. In the FeBCrAlNi/B_4C system, the hardness of the coating can be significantly increased by Bs4C. The average hardness of the coating increased from 786.82 HV_ (0.1) to 1006.58 HV_ (0.1) when the content of B _ 4C was increased from 0% to 6%. However, the hardness of the coating decreased to 741.45 HV_ (0. 1) when the content of B _ 4 C increased to 9. The coatings show good thermal shock resistance and high temperature erosion wear resistance. A certain amount of amorphous phase was found in FeCrBSi (Mo/W) coating. The average hardness of the coating was between 646.95 and 910.37 HV_ (0.1). The microstructure of FeCrBSiW (WC) coating was the most compact, and the content of amorphous phase was 24%. The crystallization temperature is 513.9 鈩，
本文编号：2358967
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