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Biochar in cementitious material—A review on physical, chemical, mechanical, and durability properties 胶凝材料中的生物炭——物理、化学、机械和耐久性性能综述
IF 1.8 Q2 Materials Science Pub Date : 2023-01-01 DOI: 10.3934/matersci.2023022
Pravina Kamini, K. Tee, J. Gimbun, S. C. Chin
Ordinary Portland Cement (OPC) is a crucial building component and a valuable strategic resource. The production of cement accounts for 5% to 10% of global carbon dioxide (CO2) emissions. Over the years, many researchers have been studying ways to reduce the amount of CO2 in the atmosphere caused by cement production. Due to its properties, biochar is found to be an interesting material to be utilised in the construction industry due to its effectiveness in CO2 sequestration. Biochar is a solid residue created by the thermal breakdown of biomass at moderate temperatures (350–700 ℃) without oxygen or with a small amount of oxygen, sometimes known as bio-carbon. Biochar has a wide range of uses, including those for heating and electricity generation, cleaning flue gases, metallurgy, animal husbandry, agriculture, construction materials, and even medicine. The objective of this paper is to review the potential of biochar as a cementitious material by evaluating its physical, chemical, mechanical, and durability properties. Using biochar as a cementitious material makes it possible to conclude that cement production will be reduced over time by partial replacement, which will also promote and encourage sustainable development in the future.
普通硅酸盐水泥(OPC)是一种重要的建筑材料,也是一种宝贵的战略资源。水泥的生产占全球二氧化碳排放量的5%到10%。多年来,许多研究人员一直在研究减少水泥生产造成的大气中二氧化碳含量的方法。由于其特性,生物炭被发现是一种有趣的材料,可用于建筑行业,因为它在二氧化碳封存方面具有有效性。生物炭是在中等温度下(350-700℃)无氧或含少量氧气的生物质热分解产生的固体残渣,有时被称为生物碳。生物炭具有广泛的用途,包括用于加热和发电、清洁烟道气、冶金、畜牧业、农业、建筑材料,甚至医药。本文的目的是通过评估生物炭的物理、化学、机械和耐久性性能来回顾其作为胶凝材料的潜力。使用生物炭作为胶凝材料可以得出这样的结论:随着时间的推移,水泥产量将通过部分替代而减少,这也将促进和鼓励未来的可持续发展。
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引用次数: 0
Review of effective techniques for surface engineering material modification for a variety of applications 综述了各种表面工程材料改性的有效技术
IF 1.8 Q2 Materials Science Pub Date : 2023-01-01 DOI: 10.3934/matersci.2023037
G. El-Awadi
The status of current advances in modifying surfaces for the protection of materials is reviewed in this research. The main goal of material selection is to improve and reinforce surface functionalities. A few examples of surface modification techniques include sol-gel, cladding, electroplating, plasma and thermal spraying, physical deposition of vapors (PVD), vapor chemical deposition (CVD) and beam electron physical vapor deposition (EB-PVD). Strengthening by flame, induction, laser or electron beam is one type of surface modification procedure. Other types include plasma-immersed ion implantation and ion implantation at high energies, as well as diffusion treatments like carburizing and nitriding. Friction control, improved surface corrosion and wear resistance and changes to a component's mechanical or physical qualities are all possible using surface modification methods. The study also contains contemporary research in laser therapy, PVD, EB-PVD, thermal spraying and ion implantation. Additionally, magnetron sputtering (MS) is a widely used and successful approach for thin film coating in the current study. It is crucial to remember that each approach has a distinct set of restrictions, and the method's parameters might change based on the one that is selected, such as deposition targets, overall vacuum substrate temperature, reactive or mixed gas type, pressure percentage and bias voltage, which all have impacts on the PVD technique's layer qualities. Phase formation, change in phase, hardness and film structure of monolayer and multilayer films formed on the substrate under various circumstances also cause variations in the characteristics. Additionally, ion implantation enhances the surface characteristics of layers by implanting ions such as N+, B+, C+, etc. The study shows that the higher layers of multilayer enhance the degree of hardness and lower friction coefficients. To enhance the protection of thermal resistance, a thermal spraying barrier coating was coated on substrate nickel-base alloys, and the surface materials' texture, hardness and wear rate were altered by laser beam. Additionally, a heat pipe's performance was improved by a factor of 300 by adding a tiny coating of gold.
本文综述了改性材料表面保护技术的最新进展。材料选择的主要目标是改善和加强表面功能。表面改性技术的一些例子包括溶胶-凝胶、包覆、电镀、等离子体和热喷涂、物理气相沉积(PVD)、气相化学沉积(CVD)和束电子物理气相沉积(EB-PVD)。火焰、感应、激光或电子束强化是一种表面改性方法。其他类型包括等离子体浸没离子注入和高能离子注入,以及渗碳和渗氮等扩散处理。使用表面改性方法可以控制摩擦,改善表面腐蚀和耐磨性,改变部件的机械或物理质量。该研究还包括激光治疗,PVD, EB-PVD,热喷涂和离子注入的当代研究。此外,磁控溅射(MS)是目前广泛应用和成功的薄膜涂层方法。重要的是要记住,每种方法都有不同的限制,并且方法的参数可能会根据所选择的方法而变化,例如沉积目标,整体真空衬底温度,反应或混合气体类型,压力百分比和偏置电压,这些都会影响PVD技术的层质量。在各种情况下在衬底上形成的单层和多层薄膜的相形成、相变化、硬度和薄膜结构也会引起特性的变化。离子注入通过注入N+、B+、C+等离子增强层的表面特性。研究表明,多层材料的层数越高,硬度越高,摩擦系数越低。为了增强对基体镍基合金的热阻保护作用,在基体镍基合金表面喷涂热喷涂屏障涂层,利用激光束改变表面材料的织构、硬度和磨损率。此外,通过添加一层微小的金涂层,热管的性能提高了300倍。
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引用次数: 0
Potassium sodium niobate (KNN) lead-free piezoceramics: A review of phase boundary engineering based on KNN materials 铌酸钾钠无铅压电陶瓷:基于铌酸钾钠材料的相界工程研究进展
Q2 Materials Science Pub Date : 2023-01-01 DOI: 10.3934/matersci.2023045
Hidayah Mohd Ali Piah, Mohd Warikh Abd Rashid, Umar Al-Amani Azlan, Maziati Akmal Mohd Hatta

Lead zirconia titanate (PZT) is the most often used piezoelectric material in various electronic applications like energy harvesters, ultrasonic capacitors and motors. It is true that PZT has a lot of significant drawbacks due to its 60% lead content, despite its outstanding ferroelectric, dielectric and piezoelectric properties which influenced by PZT's morphotropic phase boundary. The recently found potassium sodium niobate (KNN) is one of the most promising candidates for a new lead-free piezoelectric material. For the purpose of providing a resource and shedding light on the future, this paper provides a summary of the historical development of different phase boundaries in KNN materials and provides some guidance on how to achieve piezoelectric activity on par with PZT through a thorough examination and critical analysis of relevant articles by providing insight and perspective of KNN, which consists of detailed evaluation of the design, construction of phase boundaries and engineering for applications.

& lt; abstract>钛酸锆铅(PZT)是各种电子应用中最常用的压电材料,如能量采集器、超声波电容器和电机。诚然,尽管PZT具有优异的铁电、介电和压电性能,但由于其60%的铅含量,PZT具有许多显着的缺点。最近发现的铌酸钾钠(KNN)是一种最有前途的新型无铅压电材料之一。为了提供资源和照亮未来,本文总结了KNN材料中不同相界的历史发展,并通过提供KNN的见解和观点,通过对相关文章的彻底检查和批判性分析,为如何实现与PZT相当的压电活性提供了一些指导,其中包括详细的设计评估;相边界的构建与应用工程。</p>& lt; / abstract>
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引用次数: 0
A versatile approach towards development of easy-to-clean transparent nanocoating systems with pronounced anti-static properties for various substrates 一种开发易于清洁的透明纳米涂层系统的通用方法,具有明显的抗静电性能,可用于各种基材
IF 1.8 Q2 Materials Science Pub Date : 2023-01-01 DOI: 10.3934/matersci.2023008
N. Papadopoulos, P. P. Falara, P. Vourna
Sol-gel is a widely applied method for the development of hydrophobic anti-soiling coatings. Most of them however suffer from serious drawbacks which restrict their generic applicability, especially on surfaces with limited number of hydroxyl groups. This study aims to propose a facile and straightforward strategy for the development of an "one-fits-all" anti-soiling coating with strong adhesion to a variety of hard, non-absorbent surfaces. The structure of the proposed composition is based on a two-component coating system consisting of an organopolysilazane primer and an alkoxysilane topcoat, based on a quaternarized ammonium silane. Morphology and microstructure were systematically studied, while hydrophobicity, adhesion, stability, abrasion and chemical resistance were determined on aluminum and PC substrates. The anti-soiling behavior of the proposed coating system was also evaluated. It was found that the polysilazane primer provided mechanical and chemical robustness regardless of substrate type, while the quaternarized silane offered pronounced easy-to-clean and anti-static attributes. The combination of such attributes within a single sol-gel coating system is highly beneficial for numerous applications.
溶胶-凝胶法是制备疏水防污涂料的一种广泛应用的方法。然而,它们中的大多数都有严重的缺陷,这限制了它们的普遍适用性,特别是在羟基数量有限的表面上。本研究旨在提出一种简单而直接的策略,用于开发一种“一劳永逸”的防污涂层,该涂层具有很强的附着力,可粘附于各种坚硬的非吸收性表面。所提出的组合物的结构基于双组分涂层体系,该体系由基于季铵盐硅烷的有机聚硅烷底漆和烷氧基硅烷面漆组成。系统地研究了铝基材和PC基材的形貌和微观结构,并测定了其疏水性、附着力、稳定性、耐磨性和耐化学性。并对该涂层体系的抗污性能进行了评价。研究发现,无论底物类型如何,聚硅氮烷底漆都具有机械和化学坚固性,而季铵盐硅烷底漆具有明显的易于清洁和抗静电特性。在一个单一的溶胶-凝胶涂层系统中,这些属性的组合对于许多应用都是非常有益的。
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引用次数: 2
Biogenic synthesis, characterization and effects of Mn-CuO composite nanocatalysts on Methylene blue photodegradation and Human erythrocytes Mn-CuO复合纳米催化剂的生物合成、表征及对亚甲基蓝光降解和人红细胞的影响
IF 1.8 Q2 Materials Science Pub Date : 2023-01-01 DOI: 10.3934/matersci.2023019
Carlos N. Kabengele, Giresse N. Kasiama, E. M. Ngoyi, C. L. Inkoto, Juvenal M. Bete, P. B. Babady, D. Tshibangu, D. Tshilanda, H. M. Kalele, P. Mpiana, K. Ngbolua
Each year more than 150, 000 tons of dyes are released in effluents by industries. These chemicals entities non-biodegradable and toxic can be removed from effluent by metallic nanomaterials. The aqueous extract of Manotes expansa leaves is used as reducing and stabilizing agent in the biogenic synthesis of Mn-CuO nanocomposites. The nanoparticles obtained were characterized using UV-visible spectroscopy, X-ray Diffraction (XRD), X-ray Fluorescence, Dynamic Light Scattering (DSL), and Scanning Electron Microscopy (SEM). The hemotoxicity of biosynthesized nanomaterials was assessed by evaluating their hemolytic activity using erythrocytes as a model system. The photocatalytic activity of Mn-CuO was carried out by photocatalytic degradation of Methylene Blue dye as a model. The results obtained by UV-vis spectroscopy showed a Plasmonic Surface Resonance band at 408 nm. XRD and X-ray fluorescence made it possible to identify the presence of particles of formula Mn0.53Cu0.21O having crystallized in a Hexagonal system (a = 3.1080 Å and c = 5.2020 Å). Spherical morphology and average height 49.34 ± 6.71 nm were determined by SEM and DSL, respectively. The hemolytic activity of biosynthesized nanomaterials revealed that they are not hemotoxic in vitro (% hemolysis 3.2%) and 98.3% of Methylene Blue dye was removed after 120 min under irradiation with solar light in the presence of Mn-CuO nanocomposites.
每年有超过15万吨的染料被工业排放到废水中。这些不可生物降解的有毒化学物质可通过金属纳米材料从废水中去除。以野榄叶水提物为还原剂和稳定剂,生物合成Mn-CuO纳米复合材料。采用紫外可见光谱、x射线衍射(XRD)、x射线荧光、动态光散射(DSL)和扫描电子显微镜(SEM)对纳米颗粒进行了表征。以红细胞为模型系统,通过评价其溶血活性来评价生物合成纳米材料的血液毒性。以光催化降解亚甲基蓝染料为模型,研究了Mn-CuO的光催化活性。紫外-可见光谱分析结果显示在408 nm处存在等离子体表面共振带。XRD和x射线荧光可以识别出在六边形体系(a = 3.1080 Å和c = 5.2020 Å)中结晶的式Mn0.53Cu0.21O颗粒的存在。通过SEM和DSL测定了其球形形貌,平均高度分别为49.34±6.71 nm。生物合成纳米材料的溶血活性表明,它们在体外没有血液毒性(%溶血3.2%),并且在Mn-CuO纳米复合材料存在下,在太阳光照射120分钟后,98.3%的亚甲基蓝染料被去除。
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引用次数: 1
Study of the structure and mechanical properties of composites used in the oil and gas industry 研究石油和天然气工业中复合材料的结构和力学性能
IF 1.8 Q2 Materials Science Pub Date : 2023-01-01 DOI: 10.3934/matersci.2023033
P. Rusinov, Z. Blednova, A. Rusinova, G. Kurapov, Maxim Semadeni
This article describes the structure and properties of the developed hybrid composite Hastelloy X (NiCrFeMo)-AlMoNbTaTiZr-cBNSiCNiAlCo. The composite was obtained by the high velocity oxygen fuel spraying (HVOF) method in a protective atmosphere with a subsequent high-temperature thermomechanical treatment. In order to obtain new information about the structure, we studied the metallophysical properties of the composite using electron microscopy and X-ray diffraction analysis, as well as the mechanical properties and phase composition. We studied the influence of high-energy mechanical processing of high-entropic and ceramic materials on the structural-phase state and composite quality. We determined the optimal technological parameters of HVOF in a protective atmosphere, followed by a high-temperature thermomechanical treatment. Additionally, we optimized these parameters to form a hybrid composite providing the highest adhesion and low porosity. Moreover, we investigated the microhardness of the composite layers. On the basis of complex metallophysical studies, we examined the composite formation. In order to determine the endurance limit in comparison to various other composite materials, we carried out cyclic endurance tests of the developed materials.
本文介绍了研制的哈氏合金X (NiCrFeMo)-AlMoNbTaTiZr-cBNSiCNiAlCo复合材料的结构和性能。在保护气氛下采用高速氧燃料喷涂(HVOF)法制备复合材料,并进行高温热处理。为了获得新的结构信息,我们利用电子显微镜和x射线衍射分析研究了复合材料的金相物理性能,以及力学性能和相组成。研究了高熵陶瓷材料的高能机械加工对结构相态和复合材料质量的影响。在保护气氛下确定了HVOF的最佳工艺参数,并对其进行了高温热处理。此外,我们优化了这些参数,形成了具有最高附着力和低孔隙率的混合复合材料。此外,我们还研究了复合材料层的显微硬度。在复杂金属物理研究的基础上,对复合地层进行了鉴定。为了确定与其他各种复合材料相比的耐久性极限,我们对所开发的材料进行了循环耐久性试验。
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引用次数: 0
Scrapping of PEKK-based thermoplastic composites retaining long fibers and their use for compression molded recycled parts 保留长纤维的pek基热塑性复合材料的报废及其用于压缩成型回收部件的用途
Q2 Materials Science Pub Date : 2023-01-01 DOI: 10.3934/matersci.2023044
Alejandro Sandá, Rocío Ruiz, Miguel Ángel Mafé, Jon Ander Sarasua, Antonio González-Jiménez

In this work, a novel method for a more sustainable recycling and cost-efficient manufacturing technique of polyether ketone ketone (PEKK) based thermoplastic composite materials is proposed to recover and reprocess waste and end-of-life materials in the aerospace industry. For the recycling of carbon fiber reinforced thermoplastics (CFrTP), an innovative scrapping process based on mechanical cutting was developed and the properties of the obtained scrap and the recycled panel were analyzed. Thus, a cutting tool was developed for the delamination of the input material so that long fibers can be retained in the resulting scrap. Different processing approaches of material scrapping were evaluated, aiming to obtain manageable scrap that can be subsequently used for a compression molding process. Additionally, an automatic process was evaluated to manage the scrap and perform the corresponding lay-up to manufacture high-quality thermoplastic composite products with recycled materials.

& lt; abstract>在这项工作中,提出了一种更可持续回收和更具成本效益的聚醚酮酮(PEKK)基热塑性复合材料制造技术的新方法,用于回收和再加工航空航天工业中的废物和报废材料。针对碳纤维增强热塑性塑料(CFrTP)的回收利用,开发了一种基于机械切割的新型报废工艺,并对所获得的废料和回收板材的性能进行了分析。因此,开发了一种用于输入材料分层的切割工具,以便在产生的废料中保留长纤维。评估了材料报废的不同处理方法,旨在获得可管理的废料,随后可用于压缩成型工艺。此外,还评估了一个自动化过程,以管理废料并执行相应的铺层,从而用回收材料生产高质量的热塑性复合材料产品。& lt; / abstract>
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引用次数: 0
Low-cost piezoelectric sensors and gamma ray attenuation fabricated from novel polymeric nanocomposites 新型聚合物纳米复合材料制备的低成本压电传感器和伽马射线衰减
IF 1.8 Q2 Materials Science Pub Date : 2023-01-01 DOI: 10.3934/matersci.2023015
Shaimaa Mazhar Mahdi, M. Habeeb
This study looks at the synthesis of innovative PEO/PVA/SrTiO3/NiO nanocomposites for piezoelectric sensors and gamma shielding applications that are low weight, elastic, affordable and have good gamma ray attenuation coefficients. The impact of SrTiO3/NiO on the structural characteristics of the PEO/PVA mixture is investigated. The polymer mixture PEO/PVA received additions of SrTiO3/NiO at concentrations of (0, 1, 2, 3 and 4) weight percent by the casting method. On the top surface of the films PEO/PVA/SrTiO3/NiO NCs, scanning electron microscopy reveals several randomly distributed aggregates or fragments that are consistent and coherent. An optical microscope image collection reveals that the blend*s additive distribution of NPs was homogenous. Gamma ray shielding application results show that the attenuation coefficient of PVA/PEO/SrTiO3/NiO NCs is increased by increasing concentration of SrTiO3/NiO nanoparticles. Radiation protection is another application for it. The pressure sensor application findings of NCs show that, when the applied pressure rises, electrical capacitance (Cp) increase.
本研究着眼于合成用于压电传感器和伽马屏蔽应用的创新型PEO/PVA/SrTiO3/NiO纳米复合材料,该复合材料重量轻,弹性好,价格合理,具有良好的伽马射线衰减系数。研究了SrTiO3/NiO对PEO/PVA混合料结构特性的影响。采用浇铸法,在PEO/PVA聚合物混合物中分别添加质量分数为(0,1,2,3和4)%的SrTiO3/NiO。在PEO/PVA/SrTiO3/NiO NCs薄膜的上表面,扫描电镜显示了一些随机分布的聚集体或碎片,这些聚集体或碎片一致且连贯。光学显微镜采集的图像显示,共混物中NPs的加性分布是均匀的。伽玛射线屏蔽应用结果表明,随着SrTiO3/NiO纳米粒子浓度的增加,PVA/PEO/SrTiO3/NiO纳米粒子的衰减系数增大。防辐射是它的另一个应用。nc压力传感器的应用结果表明,当施加压力增大时,电容(Cp)增大。
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引用次数: 14
Welding on C67 steel grade sheet: Influence of the parameters and post welding heat treatment C67钢板焊接工艺参数及焊后热处理的影响
IF 1.8 Q2 Materials Science Pub Date : 2023-01-01 DOI: 10.3934/matersci.2023025
U. K. Dhar, Md. Farabi Rahman, Mustafa O Ayanoglu, Ahammad Abdullah
In batch operation, most industries require engineers to maintain low hardness on the welded parts, particularly for low carbon steel. This article focuses on tungsten inert gas (TIG) welding performed on 0.90 mm of a C67 grade sheet by varying different welding parameters such as current, velocity, and temperature. Samples were collected from the tool side, mid-wall, and operator side for metallographic and micro-hardness examinations considering various parameters. Without post welding heat treatment (PWHT), the welded parts were quenched at room temperature, while with PWHT the welded parts were kept at 710 ℃ for 99 s after welding, and subsequently, the samples were cooled slowly by air at ambient temperature. An increase in hardness was registered in either the fusion zone or melted zone, with decrements in the heat affected zone (HAZ) for both procedures. When the the welding was performed without PWHT, a martensitic and bainitic microstructure was noticed in the melting zone (MZ) and HAZ, respectively. In contrast, a bainitic microstructure was observed in either the melting or heat affected zone in the welding with PWHT. Metallographic images revealed crack propagation when welding was performed without PWHT. A larger HAZ was noted in the welding sample with PWHT, and hardness was also relatively lower compared the samples without PWHT. There was no significant difference in hardness among the samples taken from tool side, mid-wall, and operator side for both procedures. Finally, the lowest microhardness (265 HV) was found in the MZ when the welding was carried out with PWHT employing a 90 A current and 10 mm/s velocity.
在批量操作中,大多数行业要求工程师在焊接部件上保持低硬度,特别是低碳钢。本文重点研究了通过改变不同的焊接参数,如电流、速度和温度,在0.90 mm的C67级板材上进行钨惰性气体(TIG)焊接。从工具侧、中壁和操作器侧收集样品,考虑各种参数进行金相和显微硬度检查。在不进行焊后热处理的情况下,焊接件在室温下进行淬火;在进行焊后热处理的情况下,焊接件在710℃下保温99 s,然后在常温下用空气缓慢冷却。在熔合区或熔化区都记录了硬度的增加,在热影响区(HAZ)都记录了硬度的降低。无PWHT焊接时,熔化区(MZ)和热区(HAZ)分别出现马氏体和贝氏体组织。在PWHT焊接过程中,熔点和热影响区均出现贝氏体组织。金相图像显示,在没有PWHT的情况下进行焊接时裂纹扩展。有PWHT的焊接试样的热影响区较大,硬度也相对较低。在两种程序中,从工具侧、中壁和操作人员侧采集的样品中,硬度没有显著差异。最后,采用90 a电流和10 mm/s速度的PWHT进行焊接时,MZ的显微硬度最低(265 HV)。
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引用次数: 1
Influence of helium plasma on the structural state of the surface carbide layer of tungsten 氦等离子体对钨表面碳化物层结构状态的影响
IF 1.8 Q2 Materials Science Pub Date : 2023-01-01 DOI: 10.3934/matersci.2023040
M. Skakov, A. Miniyazov, V. Baklanov, A. Gradoboev, T. Tulenbergenov, I. Sokolov, Yernat Kozhakhmetov, G. Zhanbolatova, I. Kukushkin
This paper presents the results of the experimental studies of the helium plasma interaction with a surface carbide layer of tungsten. The experiments were carried out on a plasma beam installation (PBI) at a constant energy of incoming ions of 2 keV and at a surface temperature of the tungsten carbide layer of ~905 and ~1750 ℃. The local parameters (Te, n0) of the helium plasma were evaluated using the probe method and spectrometric analysis of the plasma composition. The helium plasma irradiated two types of the carbide layer on the tungsten surface, WC and W2C. The mechanisms of changing the tungsten surface morphology in the result of the plasma irradiation have been described. The study of the surface structure of the tungsten samples with a carbide layer of two types (WC, W2C) after the exposure to the helium plasma has revealed two different types of the formation of helium bubbles and changes in the surface morphology. The physical mechanism of the formation of helium bubbles consists in the capture of helium atoms by the thermal vacancies generated at high temperature by the material surface. However, with a significant increase in temperature to 1750 ℃, the formation of the bubbles was no longer observed and the sample surface had a developed coral-like structure with crystallographically oriented grains.
本文介绍了氦等离子体与钨表面碳化物层相互作用的实验研究结果。实验在等离子体束流装置(PBI)上进行,入射离子能量为2kev,碳化钨层表面温度为~905 ~ ~1750℃。利用探针法和等离子体组成的光谱分析对氦等离子体的局部参数Te, n0进行了评价。氦等离子体辐照钨表面WC和W2C两种类型的碳化物层。介绍了等离子体辐照后钨表面形貌变化的机理。通过对两种碳化钨层(WC、W2C)的钨样品在氦等离子体辐照后表面结构的研究,揭示了两种不同类型的氦气泡的形成和表面形貌的变化。氦气泡形成的物理机制是材料表面在高温下产生的热空位捕获氦原子。然而,当温度显著升高到1750℃时,气泡不再形成,样品表面具有发育的珊瑚状结构和晶体取向晶粒。
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引用次数: 0
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