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Radical involved reactive wetting and retarding mechanism of alumina refractory ceramic by molten slags under weak static magnetic field

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Journal of Iron and Steel Research International 2024年第6期31卷 1355-1366页

作者： Sheng-hao Li ao huang Fan-bo Zeng Hui Peng Hao-ran Wei Xue-chun huang Sheng-qiang Song Hua-zhi Gu The State Key Laboratory of Refractories and Metallurgy Wuhan University of Science and TechnologyWuhan 430081HubeiChina

High alumina slag will cause severe corrosion at the interface of alumina refractory,and the wetting behavior of slag is a key factor influencing the corrosion resistance of refractory *** static magnetic field is a promising solution for improvement in the slag resistance of *** wetting of alumina refractory ceramics with different basicities of high alumina slags under a weak static magnetic field was analyzed,given that a weak static magnetic field can affect the corrosion behavior of refractory *** slag S_(3) as an example,when there was an external static magnetic field of 1.0 mT at 1600 ℃,the thickness of calcium aluminate reaction layer at the interface decreased by 36.7%,the denting depth of interface decreased by 35.6%,and the apparent wetting angle increased by 20%.The living radicals and their formation path in oxide melts were verified by first-principles calculation combined with electron paramagnetic resonance spectroscopy *** influence of the flux density of a weak static magnetic field on the wetting behavior of slags was also *** contact angle of the slags increased owing to the inhibitory effect of magnetic field on the radicalinvolved reaction at the interface of the slag and the alumina refractory *** relationships between the magnetic flux density,diffusion coefficient,slag microstructure(hyperfine coupling constant),and contact angle were *** provides a theoretical basis for the field control of radical involved reactive wetting between inorganic oxide slags and solid oxide ceramics.

关键词： Alumina refractory ceramic Molten slag Weak magnetic field effect Reactive wetting Free radical

Effect of MgO-Cr_(2)O_(3) and Mg0-MgAl_(2)0_(4)-based refractories on refractory-steel interface reaction and cleanliness of pipeline steel

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Journal of Iron and Steel Research International 2024年第4期31卷 849-860页

作者： Guang-mei Yang Cheng Yuan Chang Liu Qiang Wang Guang-qiang Li Yong-shun Zou ao huang The State Key Laboratory of Refractories and Metallurgy Wuhan University of Science and TechnologyWuhan 430081HubeiChina Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education Wuhan University of Science and TechnologyWuhan 430081HubeiChina

The interaction of MgO-MgAl_(2)O_(4)-based and MgO-Cr_(2)O_(3)-based refractories with X70 molten steel was studied by immersion experiments at 1560℃.The effects of immersion time(30 and 60 min)on the contents of total oxygen(TO),Al,Nb,Si,Mn,and Cr as well as the composition,number density,and size distribution of inclusions in the molten steel were *** influence of the penetration and erosion degree of the molten steel to the refractory on the steel-refractory interface layer was *** results show that,at 1560℃,the MgO-MgAl_(2)O_(4)-based refractory can better control the contents of TO and the composition of molten steel compared with the MgO-Cr_(2)O_(3)-based *** TO content is only 16×10^(-4) wt.%in the molten steel after reacted with the Mg0-MgAl_(2)O_(4)-based refractory at the end point of refining,4 accounting for 11.5%of that reacted with the MgO-Cr_(2)O_(3)-based refractory(139×10^(-4) wt.%).The number density of inclusions is only 14 mm^(-2),and the average size ofinclusions is only 1.31μm,with thelargest proportion of inclusions in 1-2μm(70%).The Al_(2)O_(3)-MnS-Cao complex inclusions in the original steel changed to complex inclusions dominated by Cr-Nb-Mn-S-O and ***_(2)O_(3),corresponding to the MgO-Cr_(2)O_(3)-based and MgO-MgAl_(2)O_(4)-based refractories,*** ***_(2)O_(3) layer was formed at the reaction interface between MgO-MgAl_(2)O_(4)-based refractory and molten steel,which is helpful to restrict the erosion of refractories and the pollution of molten *** damage mechanism of the MgO-Cr_(2)O_(3)-based refractory is mainly permeation and chemical reaction,while the damage of the MgO-MgAl_(2)O_(4)-based refractory is mainlyscouring erosion.

关键词： MgO-Cr_(2)O_(3)-based refractory MgO-MgAl O_(4)-based refractory Nonmetallic inclusion Erosion interface layer Steel penetration

Effect of ferrotitanium slag on microstructure and properties of Al2O3-SiC-C castables for iron runner

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JOURNAL OF IRON AND STEEL RESEARCH INTERNATIONAL 2024年第9期31卷 2122-2132页

作者： Long, Tu Gu, Hua-zhi Zhang, Mei-jie huang, ao Fu, Lv-ping Chen, Ding Qiu, Wen-dong Ju, Mao-qi Wuhan Univ Sci & Technol State Key Lab Refractories & Met Wuhan 430081 Hubei Peoples R China Baowu Equipment Intelligent Technol Co Ltd Shanghai 200941 Peoples R China Wuhan Res Inst Met Construct Co Ltd MCC Grp Wuhan 430081 Hubei Peoples R China

Ferrotitanium slag (FS) is a waste slag produced during the smelting of ferrotitanium alloys by thermite reduction. Its alumina content is high and can be used as alumina raw material. Iron runner castables containing different amounts of FS were prepared and characterized. The results show that the introduction of FS is beneficial to the sintering of the castables sample. When the FS concentration is 11.2 wt.%, the aggregate and matrix of the castables sample have a good combination, and the mechanical strength of the Al2O3-SiC-C castable reaches a maximum at room temperature. However, excessive introduction of FS generates a large amount of anorthite phase, which reduces the mechanical strength of the Al2O3-SiC-C castable at room temperature. In addition, the high-melting phase CaTiO3 is formed in FS, which has good mechanical properties. Meanwhile, the cracks of FS are reduced, and the combination between phases is closer, thus significantly improving the hot modulus of rupture of the castable. When the FS concentration is not above 33.6 wt.%, the castables show good slag resistance. The TiO2 in FS is transformed into TiC by carbothermal reaction, which is enriched at the boundary and prevents further reaction of the slag.

关键词： Ferrotitanium slag Al2O3-SiC-C castable Hot modulus of rupture Slag resistance ALUMINOTHERMIC REDUCTION PARTIAL SUBSTITUTION GLASS-CERAMICS CORROSION MECHANISM

Performance Assessment on Corrosion Resistance of Refractory Materials Based on High-temperature Machine Vision Technology

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China's Refractories 2024年第3期33卷 42-48页

作者： Chenchen LIU ao huang Yan YU Guoping WEI Shenghao LI Huazhi GU The State Key Laboratory of Refractories and Metallurgy Wuhan University of Science and TechnologyWuhan 430081China Zhejiang Zili High Temperature Technology Co. Ltd.Shaoxing 312300China

Refractory materials,as the crucial foundational materials in high-temperature industrial processes such as metallurgy and construction,are inevitably subjected to corrosion and penetration from high-temperature media during their ***,observing the in-situ degradation process of refractory materials in complex high-temperature environments has presented ***-corrosion analysis are commonly employed to assess the slag resistance of refractory materials and understand the corrosion ***,these methods often lack information on the process under the conditions of thermal-chemical-mechanical coupling,leading to potential biases in the analysis *** this work,we developed a non-contact high-temperature machine vision technology by the integrating Digital Image Correlation(DIC)with a high-temperature visualization system to explore the corrosion behavior of Al2O3-SiO2 refractories against molten glass and Al2O3-MgO dry ramming refractories against molten slag at different *** technology enables realtime monitoring of the 2D or 3D overall strain and average strain curves of the refractory materials and provides continuous feedback on the progressive corrosion of the materials under the coupling conditions of thermal,chemical,and mechanical ***,it is an innovative approach for evaluating the service behavior and performance of refractory materials,and is expected to promote the digitization and intelligence of the refractory industry,contributing to the optimization and upgrading of product performance.

关键词： refractory materials high-temperature machine vision Digital Image Correlation(DIC) corrosion resistance

正义作为道德如何可能——休谟与罗尔斯正义的道德根据思想比较探析

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学术研究 2024年第10期 30-36,177页

作者：黄济鳌广东外语外贸大学国际关系学院广东广州510006

休谟与罗尔斯都是在非形而上学的背景下回答正义的道德根据问题的。一致的正义环境假定构成他们正义论的出发点,情感主义的理性观是他们根本的思维方式。通过对他们正义论的道德根据的追问,可以发现两种正义论的内在关联和不同的局限性... 详细信息

休谟与罗尔斯都是在非形而上学的背景下回答正义的道德根据问题的。一致的正义环境假定构成他们正义论的出发点,情感主义的理性观是他们根本的思维方式。通过对他们正义论的道德根据的追问,可以发现两种正义论的内在关联和不同的局限性,解决问题的方法在于对同情和正义感在正义论中的地位的澄清与确定。通过对正义环境假设的适当修改不但可以较好地回答正义的道德根据问题,而且可以明了两种正义论的一致性。休谟和罗尔斯的正义论各有侧重,但可以互相补充,体现了西方非形而上学正义论发展进程中可以互为环节的两种解释方式。

关键词：休谟罗尔斯正义的道德根据同情理性

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超临界CFB锅炉水冷壁管分区段热应力分析

科学技术与工程 2024年第23期24卷 9875-9883页

作者：黄澳卿黎杨溢昆明理工大学公共安全与应急管理学院昆明650093 昆明理工大学国土资源工程学院昆明650093

为确保循环流化床锅炉水冷壁的正常运行,以避免发生蠕变变形、高温腐蚀等生产事故。以600 MW超临界循环流化床(circulating fluidized bed,CFB)锅炉为研究对象,建立了水冷壁温度应力场数值模型。并利用分区段炉膛热力计算理论和新IAPWS-... 详细信息

为确保循环流化床锅炉水冷壁的正常运行,以避免发生蠕变变形、高温腐蚀等生产事故。以600 MW超临界循环流化床(circulating fluidized bed,CFB)锅炉为研究对象,建立了水冷壁温度应力场数值模型。并利用分区段炉膛热力计算理论和新IAPWS-IF97公式,对运行状态中水冷壁分区段进行壁温和热应力分析。结果表明:各区段管壁温度与应力场分布变化一致,但由于工质焓值和高温烟气的交叉作用,区段5存在最高壁温与最大热应力。进一步对区段5进行传热恶化分析可得,管壁最高温度部位发生转移,且壁温与热应力最大值皆超过设计值,可能导致水冷管爆管或断裂。随后针对安全隐患,通过数值模拟方法从降低局部热负荷和控制质量流速的角度来防止锅炉传热恶化,为锅炉安全监测提供了有效建议与防治手段。

关键词：超临界CFB锅炉分区段算法水冷壁热应力传热恶化

高新技术制造企业风险承担影响机制的组态路径研究:基于激励与监督视角

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管理工程学报 2024年第5期38卷 52-65页

作者：任宗强黄奥虞曦凯刘景江温州大学商学院浙江温州325035 上海大学管理学院上海200444 浙江大学管理学院浙江杭州310058

在全球保护主义上升和技术封锁加剧的背景下,提升企业风险承担能力,促进科技创新是一个重要的时代命题。基于委托代理理论中的激励与监督视角,本文构建了企业风险承担的驱动机制模型,并通过模糊集定性比较分析(fsQCA),检验了由激励机制... 详细信息

在全球保护主义上升和技术封锁加剧的背景下,提升企业风险承担能力,促进科技创新是一个重要的时代命题。基于委托代理理论中的激励与监督视角,本文构建了企业风险承担的驱动机制模型,并通过模糊集定性比较分析(fsQCA),检验了由激励机制因素和监督机制因素构成的条件组态对中国高新技术制造企业高风险承担水平的影响路径。研究结果表明,单一条件并不构成高风险承担水平的必要条件;激励机制条件和监督机制条件间的“耦合效应”最终形成了四条高风险承担路径,即资金驱动型、风投债务型、信息披露型和群体分担型,它们之间互不冲突且完全等效,体现了“殊途同归”的原则。研究结论不仅从理论上揭示了高新技术制造企业风险承担的多重影响机制,而且为这些企业的科技创新风险管理提供了实践指导。

关键词：企业创新风险承担激励与监督委托代理理论组态效应

环北部湾广西水资源配置工程水土保持方案弃渣场设计

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广西水利水电 2024年第4期 139-141页

作者：黄傲雪广西水利电力勘测设计研究院有限责任公司南宁530023

介绍了生产建设项目水土保持方案管理办法出台的背景。在梳理相关水土保持方案编制要求的基础上,分析环北部湾广西水资源配置工程水土保持方案弃渣场设计的具体内容,提出减少工程弃渣及综合利用、弃渣场选址与防护等方案。

关键词：弃渣场选址防护设计弃渣减量综合利用环北部湾广西水资源配置工程

基于三角级数解的钢-混凝土组合梁弹性弯曲变形计算方法

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建筑结构学报 2024年第5期45卷 253-261页

作者：叶华文蒋成川黄澳冯治皓叶杨帆周渝西南交通大学土木工程学院四川成都610031

目前针对考虑界面滑移效应的钢-混凝土组合梁的弯曲变形计算公式缺乏广泛适应性,不便于组合梁结构设计。为此,采用三角级数构造组合梁弹性弯曲变形和界面滑移的位移函数,根据最小势能原理和变分法,推导了简支组合梁在不同荷载类型下的... 详细信息

目前针对考虑界面滑移效应的钢-混凝土组合梁的弯曲变形计算公式缺乏广泛适应性,不便于组合梁结构设计。为此,采用三角级数构造组合梁弹性弯曲变形和界面滑移的位移函数,根据最小势能原理和变分法,推导了简支组合梁在不同荷载类型下的弹性弯曲变形和界面滑移的计算公式,进而得到考虑滑移效应的组合梁抗弯刚度和界面滑移值的统一显式解。通过与大量已有文献中的试验值和既有计算方法比较,验证了其有效性和准确性。结果表明:根据三角级数解推导出的钢-混凝土组合梁弯曲刚度计算公式简洁直观,物理意义明确,结果可靠,所提出的方法适用于精确计算正常使用状态下组合梁弯曲变形。

关键词：钢-混凝土组合梁界面滑移弯曲变形三角级数解统一计算公式