Surface & Coatings Technology最新文献

{"title":"Study on a facile method of in-situ fabricating enhanced corrosion protection LDH/PEO composites coating on Mg alloy and its growth behavior","authors":"Wenyi Qiu ,&nbsp;Xinglong Ye ,&nbsp;Yan Liu ,&nbsp;Bin Lin ,&nbsp;Junfeng Chen ,&nbsp;Lei Xiao ,&nbsp;Chen Wang ,&nbsp;Bingshu Wang ,&nbsp;Xiping Cui ,&nbsp;Linchi Zou","doi":"10.1016/j.surfcoat.2025.131912","DOIUrl":"10.1016/j.surfcoat.2025.131912","url":null,"abstract":"<div><div>In order to achieve in-situ growth of layered double hydroxides (LDH) film on plasma electrolytic oxidation (PEO) coating of AZ31B magnesium alloy under mild conditions, a facile method was used in this work, that is ethylenediaminetetraacetic acid (EDTA)-assisted growth method. Compared to the conventional hydrothermal method, the fabrication of LDH/PEO composite coating by this method does not require a high temperature and high pressure environment and is not constrained by the size of the reactor. Furthermore, the obtained LDH/PEO composite coating exhibits enhanced corrosion protection, which will be widely applied in corrosion protection field of surface engineering. In this work, an effective strategy to control the dissolution of PEO coating and the growth of LDH film by regulating the concentration of EDTA was proposed, after revealing the growth behavior of LDH on PEO coating during this facile fabrication process. The growth behavior of LDH film can be briefly summarized in three stages: PEO coating dissolution, LDH nucleation, and LDH growth. Interestingly, the growth mechanism of LDH was changed with EDTA assistance. LDH shifted from preferential growth within the micropores of the PEO coating to uniform growth. With the assistance of 0.06 M EDTA, which is optimal, the dissolution of original PEO coating provided a stable and sufficient Mg source for the growth of LDH film, resulting in a dense LDH network structure on the PEO coating. This uniformly grown LDH film could not only seal the inherent defects of the PEO coating but also exhibited the ability to adsorb corrosive anions, which increases the tortuosity and difficulty in penetration of corrosive media, significantly improving the corrosion resistance of the LDH/PEO composite coating.</div></div>","PeriodicalId":22009,"journal":{"name":"Surface & Coatings Technology","volume":"500 ","pages":"Article 131912"},"PeriodicalIF":5.3,"publicationDate":"2025-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143394939","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Excellent friction properties of 19Al–24Cr–19Ti–37Ni–1Y eutectic high-entropy alloy cladding prepared on Inconel 617 through plasma cladding","authors":"Chengju Qiu,&nbsp;Xinjian Yuan,&nbsp;Silin Xiang,&nbsp;Xingfeng Zuo,&nbsp;Yang Li,&nbsp;Ting Li,&nbsp;Zheng Zhou","doi":"10.1016/j.surfcoat.2025.131911","DOIUrl":"10.1016/j.surfcoat.2025.131911","url":null,"abstract":"<div><div>The traditional high-temperature alloy used for cladding layers has problems, such as cracking or even shedding, at the harsh service temperatures of the high-temperature wear-resistant sealing surfaces of valves. Eutectic high-entropy alloys (EHEAs), which combine the advantages of eutectic and high-entropy alloys, have good application prospects at these temperatures. In this study, cladding layers of Stellite 6 cobalt-based alloy, FeCoNiCrMn high-entropy alloy, and 19Al–24Cr–19Ti–37Ni–1Y EHEA were prepared through plasma cladding on Inconel 617 nickel-based alloy. The eutectic microstructure of the EHEA cladding layer comprises FCC, L2₁, and BCC phases, with the FCC phase containing an abundance of the acicular phase L1₂. The average hardness values of the three cladding layers are 450, 250, and 650 HV. The wear rate of the EHEA cladding layer is 4.8256 × 10⁻⁵ mm³/N·m, which has greatly improved compared with those of the base material and other cladding layers.</div></div>","PeriodicalId":22009,"journal":{"name":"Surface & Coatings Technology","volume":"500 ","pages":"Article 131911"},"PeriodicalIF":5.3,"publicationDate":"2025-02-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143403710","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Experimental study on thermal cycle performance of DD6 single crystal thermal barrier coating with film cooling holes","authors":"Wenbing Tian,&nbsp;Wenhu Wang,&nbsp;Yifeng Xiong,&nbsp;Yuanbin Wang","doi":"10.1016/j.surfcoat.2025.131899","DOIUrl":"10.1016/j.surfcoat.2025.131899","url":null,"abstract":"<div><div>Film-cooling holes play a critical role in increasing the inlet temperature of aviation gas turbine engines. However, the presence of these cooling holes can lead to local thermal and mechanical stresses during cold-hot cycling and high-temperature gas erosion, resulting in coating spallation along the cooling holes. Moreover, the use of picosecond laser drilling can exacerbate the coating's failure at these damaged locations. This study conducts thermal cycling experiments on DD6 single-crystal thermal barrier coatings with cooling holes, analyzing the effects of hole structure and laser processing on the thermal cycling life, surface morphology, and microstructure of the thermal barrier coatings. The results indicate that the damage and failure of the coatings are less severe for non-conventional holes compared to inclined holes, and the thermal cycling life of non-conventional holes is higher than that of inclined holes. The sharp side of the non-conventional hole exhibits smaller damage area compared to the inclined hole, while the blunt side shows no significant damage. Furthermore, when using a scanning speed of 300 mm/s and a spacing of 0.025 mm, the non-conventional holes demonstrate minimal coating damage and superior thermal cycling performance. Finally, the failure mechanism of thermal barrier coatings is analysed.</div></div>","PeriodicalId":22009,"journal":{"name":"Surface & Coatings Technology","volume":"499 ","pages":"Article 131899"},"PeriodicalIF":5.3,"publicationDate":"2025-02-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143388183","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effect of laser scanning speed on the surface characteristics and wear resistance of TiZrAlV alloy via laser gas nitriding","authors":"Zhihao Feng ,&nbsp;Kaimin Wei ,&nbsp;Tianyu Wang ,&nbsp;Qian Feng ,&nbsp;Sijie Wang ,&nbsp;Lishi Jiao ,&nbsp;Jing Ma ,&nbsp;Dezhong Meng ,&nbsp;Jianhui Li","doi":"10.1016/j.surfcoat.2025.131909","DOIUrl":"10.1016/j.surfcoat.2025.131909","url":null,"abstract":"<div><div>This study investigated the effects of laser gas nitriding treatment on the Ti-20Zr-6.5Al-4V alloy using a closed IPG quasi-continuous laser. Various analytical techniques were employed to assess the phase composition, microstructural morphology and elemental distribution of the nitrided zone and the matrix at different scanning speeds (10 mm/s, 15 mm/s and 25 mm/s) when the laser power was 150 W. Additionally, vacuum friction and wear behavior were evaluated. The results indicate that following laser nitriding, the structure of the nitrided surface primarily comprises nitride dendrites and fine α grains. Element distribution tests confirmed that the nitrides present on the surface are predominantly Ti(<em>Zr</em>)_xN_y. Furthermore, as the scanning speed decreases, the hardness of the laser nitride layer progressively increases, with the maximum microhardness observed at a scanning speed of 10 mm/s, approximately 871 HV_0.5. The vacuum friction and wear results demonstrate that at a scanning speed of 10 mm/s, the COF value of the sample is only 0.337. Analysis suggests that laser nitriding treatment effectively refines the surface grains and generates hard nitrides, thereby enhancing the hardness and wear resistance of the alloy. Further analysis confirmed that the wear of the nitride layer primarily occurs through adhesive and abrasive mechanisms.</div></div>","PeriodicalId":22009,"journal":{"name":"Surface & Coatings Technology","volume":"500 ","pages":"Article 131909"},"PeriodicalIF":5.3,"publicationDate":"2025-02-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143403706","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Damage research of supersonic plasma sprayed Al2O3/PF composite coatings on resin matrix surfaces under thermally coupled operating conditions","authors":"Yunlong Zhu ,&nbsp;Ming Liu ,&nbsp;Xiang Xu ,&nbsp;Xiang Meng ,&nbsp;Cong Wang ,&nbsp;Dingxiang He ,&nbsp;Shuying Chen ,&nbsp;Haidou Wang","doi":"10.1016/j.surfcoat.2025.131905","DOIUrl":"10.1016/j.surfcoat.2025.131905","url":null,"abstract":"<div><div>Al₂O₃/PF composite coatings are commonly used to improve the surface properties of resin materials in complex environments with coupled thermal and structural fields. In order to explore the factors of composite coating performance degradation, the coupling model of temperature field and structural field was established, and the stress change of the composite coating in the coupling field was analyzed. According to the simulation results, it is known that the middle part of the coating and the overlapping area of the heat-affected region are most prone to crack extension and delamination. In order to verify the simulation conclusions, the damage behavior of Al₂O₃/PF composite coatings in the extreme environment of multi-physical fields and the spatial evolution law were summarized and the composite coatings were experimentally analyzed. With the increase of the number of thermal coupling, the microstructure of the composite coating shows the formation and expansion of porous structure and cracks, which leads to a decrease in the protective performance of the coating. With the accumulation of the number of coupling times, the coating is damaged layer by layer from the cracks, and the damage is mainly concentrated in the already cracked parts, while the uncracked area can still maintain a certain degree of integrity and continue to provide thermal protection for the substrate. The results of the nanoindentation tests further confirm that layer-by-layer damage of the coating occurs from surface to surface under thermal coupling. The results emphasize the joint influence of temperature and mechanical loading on the material properties and provide a theoretical reference for the study of thermal coupling problems in similar materials.</div></div>","PeriodicalId":22009,"journal":{"name":"Surface & Coatings Technology","volume":"499 ","pages":"Article 131905"},"PeriodicalIF":5.3,"publicationDate":"2025-02-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143388148","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Synthesis of 2D multilayer molybdenum disulfide and graphene using a rapid thermal annealing system","authors":"Tian Ye ,&nbsp;Hetao Dai ,&nbsp;Yunting Zhu ,&nbsp;Cong Zeng ,&nbsp;Han Yan ,&nbsp;Bo Li ,&nbsp;Pingping Zhuang ,&nbsp;Weiyi Lin","doi":"10.1016/j.surfcoat.2025.131901","DOIUrl":"10.1016/j.surfcoat.2025.131901","url":null,"abstract":"<div><div>Multilayer two-dimensional (2D) materials, such as molybdenum disulfide (MoS₂), exhibit enhanced mechanical strength and electron mobility while maintaining robustness in device fabrication processes. This study aims to develop and apply a fast annealing technique using a carbon-fiber-based system to synthesize multilayer MoS₂ films and graphene, focusing on improving the synthesis process's efficiency and scalability. The methodology involves preparing films via thermolysis of ammonium tetrathiomolybdate and silicon carbide, followed by characterization using microscopy and spectroscopy. Memristors fabricated from the multilayer MoS₂ showed reliable operation at low biases (&lt;1.5 V). This method offers a broad process window, reduces synthesis time, and increases power efficiency. The findings highlight its potential to facilitate the transition of 2D materials from laboratory research to large-scale production.</div></div>","PeriodicalId":22009,"journal":{"name":"Surface & Coatings Technology","volume":"499 ","pages":"Article 131901"},"PeriodicalIF":5.3,"publicationDate":"2025-02-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143388185","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Deposition of amorphous SiC coatings by RF sputtering and properties optimization for multifunctional barrier applications in the breeding blanket of nuclear fusion reactors","authors":"G. de la Cuerda-Velázquez ,&nbsp;E. Carella ,&nbsp;M. Monclús ,&nbsp;Y. Mendez-González ,&nbsp;F.J. Sánchez ,&nbsp;R. Gonzalez-Arrabal","doi":"10.1016/j.surfcoat.2025.131897","DOIUrl":"10.1016/j.surfcoat.2025.131897","url":null,"abstract":"<div><div>The development of multifunctional coatings that simultaneously prevent Tritium (T) leaks and Li corrosion of the structural steel is necessary to ensure safe operation of breeding blankets (BBs) that use liquid metals, such as the Water-Cooled Lithium Lead (WCLL) design in nuclear fusion reactors. In this work, we present the development of amorphous Silicon Carbide (a-SiC) coatings deposited by Radio-Frequency (RF) magnetron sputtering as a potential candidate for this application. We characterize the morphology, elemental composition, density, microstructure, hardness and adhesion to the substrate of the coatings as a function of deposition parameters (Ar mass flow rate and bias voltage) and of the bonding material. We observe that low Ar mass flow rates (40 sccm), low bias voltages (-30 V) and Cr bonding lead to amorphous coatings with homogeneous and compact morphology, a high density of 3.15 g/cm³, and quite good adhesion (critical load of 303 mN) to the steel substrate for the aimed purpose. The studied coatings also present a hardness of 30 GPa and a reduced elastic modulus of 246 GPa. Such combination of properties makes a-SiC coatings a promising candidate to act as a multifunctional barrier in the breeding blanket of nuclear fusion reactors operating both in the inertial and magnetic confinement approaches.</div></div>","PeriodicalId":22009,"journal":{"name":"Surface & Coatings Technology","volume":"499 ","pages":"Article 131897"},"PeriodicalIF":5.3,"publicationDate":"2025-02-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143388147","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Ablation resistance and erosion wear properties of supersonic plasma sprayed Al2O3-PF composite coatings prepared on resin surface","authors":"Cong Wang ,&nbsp;Yunlong Zhu ,&nbsp;Haidou Wang ,&nbsp;Ming Liu ,&nbsp;Guo Jin ,&nbsp;Xiang Meng ,&nbsp;Shuying Chen ,&nbsp;Guozheng Ma","doi":"10.1016/j.surfcoat.2025.131900","DOIUrl":"10.1016/j.surfcoat.2025.131900","url":null,"abstract":"<div><div>Electromagnetic rail launcher is an advanced weapon, and the resin-based insulator is a crucial part of it. Despite their outstanding physical and mechanical properties, the easily oxidizable characteristics and unsatisfactory erosion wear performance prevent them from meeting higher demands. Preparing thermal sprayed ceramic/resin composite coatings on the surface of resin substrates is a feasible solution. The research successfully developed two types of supersonic plasma sprayed Al₂O₃-phenolic resin (Al₂O₃-PF) composite coatings on the surface of glass fiber reinforced epoxy resin. One is the S-Al₂O₃-PF composite coating prepared by spraying Al₂O₃/PF composite powder, whereas the other is the O-Al₂O₃-PF composite coating obtained by alternately spraying Al₂O₃ powder and Al₂O₃/PF composite powder. The thermodynamic properties and ablation resistance of Al₂O₃-PF composite coatings have been extensively investigated. The protective ability of Al₂O₃-PF composite coating on resin substrate has been thoroughly studied in terms of resistance to solid particle erosion wear. The results reveal that the Al₂O₃-PF composite coating has attractive thermodynamic properties and low heat conductivity (below 0.6 W·m⁻¹·K⁻¹). In regards to ablation resistance, the O-Al₂O₃-PF composite coating performs better. Its average ablation rate is about 0.029 g/s, which is 0.53 times that of the S-Al₂O₃-PF composite coating. Meanwhile, the Al₂O₃-PF composite coating assists in enhancing the erosion wear resistance of glass fiber reinforced epoxy resin. Among them, the erosion rate of the composite coating at the 90° erosion angle is about 6.65 × 10⁻³ mm³·g⁻¹, which is 0.42 times that of glass fiber reinforced epoxy resin. The study provides an effective way to improve the service life and stability of traditional insulators.</div></div>","PeriodicalId":22009,"journal":{"name":"Surface & Coatings Technology","volume":"499 ","pages":"Article 131900"},"PeriodicalIF":5.3,"publicationDate":"2025-02-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143388149","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Enhancing joint strength in direct-injection-molded PPS-Ti composite through plasma electrolytic oxidation coated interfaces","authors":"Xin Lv ,&nbsp;Weiping Dong ,&nbsp;Yongwang Sheng ,&nbsp;Jianfeng Jin ,&nbsp;Mengjia Li ,&nbsp;Yuan Zhao ,&nbsp;Shiju E ,&nbsp;Linlin Wang","doi":"10.1016/j.surfcoat.2025.131893","DOIUrl":"10.1016/j.surfcoat.2025.131893","url":null,"abstract":"<div><div>This study investigates the enhancement of bonding strength between titanium alloy (Ti-6Al-4V) and polyphenylene sulfide (PPS) in injection molded direct joining (IMDJ) composite structures through a combined sand blasting and plasma electrolytic oxidation (PEO) method. The primary objective is to explore how surface modification, particularly the introduction of chemical functional groups, influences joint strength. A porous surface structure with both macro- and micro-scale features was created on the titanium alloy surface using the sand blasting and PEO process. Urea (CO(NH₂)₂) was added to the electrolyte to successfully introduce amino (-NH₂) and hydroxyl (-OH) groups onto the metal surface, which promote hydrogen bonding and σ-hole interactions with the PPS. The results showed that increasing the urea concentration led to a corresponding increase in -NH₂ and -OH group density on the metal surface. The maximum bonding strength was observed at a urea concentration of 6 g/L, where the bonding strength was 17 times higher than that of the sand blasting group and 2.4 times stronger than the group without urea addition. This enhancement is attributed to both mechanical interlocking and the formation of chemical bonds between the titanium alloy and PPS. The findings suggest that the combined sand blasting and PEO treatment is a highly effective and simple method to achieve high-strength, durable connections in metal-polymer composite structures, with significant implications for advanced manufacturing and materials design.</div></div>","PeriodicalId":22009,"journal":{"name":"Surface & Coatings Technology","volume":"499 ","pages":"Article 131893"},"PeriodicalIF":5.3,"publicationDate":"2025-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143377588","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Phase evolution and microstructure of suspension HVOF-sprayed alumina coatings","authors":"Paul Junge ,&nbsp;Eva M. Heppke ,&nbsp;Rafael Kleba-Ehrhardt ,&nbsp;David Karl ,&nbsp;Grzegorz Cios ,&nbsp;Christian Rupprecht","doi":"10.1016/j.surfcoat.2025.131885","DOIUrl":"10.1016/j.surfcoat.2025.131885","url":null,"abstract":"<div><div>High-velocity oxygen fuel (HVOF) spraying enables the deposition of particulate ceramic materials, producing dense coatings in the micrometer to millimeter range that are particularly suitable for coating metallic parts for demanding environments. Alumina (Al₂O₃) is one of the most commonly used feedstocks for thermal spray coatings because it has good dielectric properties, excellent hardness, and corrosion resistance while being cost-effective. In this work, alumina coatings from two aqueous suspensions with different particle size distributions were processed by HVOF spraying. Rietveld refinements of the X-ray diffraction (XRD) data were used to quantitatively determine the phase content within the as-sprayed coatings. The phase composition was further explored using the electron backscatter diffraction (EBSD) method. Our work provides strong evidence for the higher retention of the thermodynamically stable <em>α</em>-<span><math><msub><mi>Al</mi><mn>2</mn></msub><msub><mi>O</mi><mn>3</mn></msub></math></span> phase in suspension HVOF-sprayed coatings compared to the powder counterpart. In addition, the impact of key processing parameters was studied, providing guidance for the production of particular phase compositions and microstructures tailored to specific application requirements.</div></div>","PeriodicalId":22009,"journal":{"name":"Surface & Coatings Technology","volume":"499 ","pages":"Article 131885"},"PeriodicalIF":5.3,"publicationDate":"2025-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143388184","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}