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17th Unified International Technical Conference on Refractories, UNITECR 2022

作者： Ma, Chengliang Li, Xiang Wang, Shijie Chen, Kaiyang Xing, Yiqiang Du, Haoran Ma, Hua School of Materials Science and Engineering Zhengzhou University Henan Key Laboratory of High Temperature Functional Ceramics Zhengzhou450052 China

Preparation and thermal insulation properties of SiO2/Al2O3 composite micropowder vacuum insulation materials are studied. We focus on effect of vacuum packaging on the thermal conductivity of core materials with different densities, effect of vacuum on the thermal conductivity of thermal insulation materials, and the change of thermal conductivity of vacuum micro-powder thermal insulation materials at different temperatures. The degree of thermal conductivity reduction of the thermal insulation material before and after packaging increases first and then decreases as the density increases. When the core material density is 0.62 g/cm3, the thermal conductivity coefficient is from 0.063 W/m·K reduced to 0.054 W/m·K. As the vacuum degree increases, the thermal conductivity of the sample gradually decreases and then tends to be gentle. Research on the thermal conductivity of the composite micropowder vacuum insulation material at different temperatures shows that: vacuum encapsulation has the greatest impact on the thermal conductivity of the sample at 200°C, with a reduction of 25%。The thermal conductivity of the sample at 400°C and 600° C is only slightly reduced, about 3~6%, because the vacuum structure has been damaged to some degree. © 2022 Unified International Technical Conference on Refractories, UNITECR 2022 - Proceedings. All rights reserved.

关键词： Thermal insulation

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PREPARATION AND PROPERTIES OF MICROCELLULAR high-STRENGTH THERMAL INSULATION materials BY high temperature MICRO-FOAMED 17

PREPARATION AND PROPERTIES OF MICROCELLULAR HIGH-STRENGTH TH...

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17th Unified International Technical Conference on Refractories, UNITECR 2022

作者： Li, Xiang Pan, Mengbo Wu, Xiaopeng Zhan, Xuewu Ma, Hua Ma, Chengliang School of Materials Science and Engineering Zhengzhou University Henan Key Laboratory of High Temperature Functional Ceramics Zhengzhou450052 China

high temperature thermal insulating materials with low bulk density, high compressive strength and low thermal conductivity were fabricated from a powder mixture of granite waste, SiC and feldspar by using a micro-foamed method. The microstructure, mechanical and thermal insulation properties were investigated comprehensively. Results show that the firing temperature, SiC particle size and the granite waste content in the mixture are key factors. Increasing firing temperature and prolonging holding time both led to a significant increase in porosity, while thermal conductivity and compressive strength showed a downward trend. Reducing the particle size of SiC leads to an increase in closed-cell porosity, thereby promoting the improvement of thermal insulation performance. In addition, as the amount of granite waste is increased, the thermal conductivity initially increases but then decreases. When the granite waste content is 90% and SiC particle size is 6.5 μm, the density decreases to 0.48 g/cm3, compressive strength is 7.2 MPa, a higher porosity of 81.6% and the thermal conductivity is 0.23 W/(mK) at 350 ℃. © 2022 Unified International Technical Conference on Refractories, UNITECR 2022 - Proceedings. All rights reserved.

关键词： Granite

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Role of Nano-oxides for Improvement Properties of Al2O3-ZrO2-C materials

Role of Nano-oxides for Improvement Properties of Al2O3-ZrO2...

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第九届国际耐火材料学术会议

作者： ZHAO Zhenyi TIAN Xuekun LIU XuSheng YIN Tianpei LIU Jinhua YAN Donghong LIU Xinhong School of Materials Science of Engineering Henan Key laboratory of High Temperature Functional Ceramics Zhengzhou University

The Al O-ZrO-C materials was prepared using tabular alumina aggregates and fines,zirconiacorundum,zirconia-mullite,flake graphite,B4 C powder,Si powder and different nano-oxides（nano-ZrO,nano-TiO,and nano-AlO） as raw materials,the effects of different nano-oxides on the properties and microstructure evolution of Al O-ZrO-C materials were *** results showed that the high reactivity nano-ZrO,nano-TiO,and nano-Al O particles play a role of promoting sintering,leading to increasing strength,oxidation resistance and corrosion *** nano-oxides react with CaO to generate high me lting point phases of CaZrO,CaTiO,CaO·6 Al O（CA） at high temperature,which forms a protective layer at the interface between corroded media and samples,inhibiting CaO penetration into the materiasls.

关键词： Nano-oxides Al2O3-ZrO2-C materials corrosion resistance properties

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Effect of Carbon Black on the Properties of Al2O3-SiC-C Castables

Effect of Carbon Black on the Properties of Al2O3-SiC-C Cast...

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第九届国际耐火材料学术会议

作者： CHEN Jing SANG Mengyang HE Mantang ZHOU Pingyi LIU Jintong LIU Xinhong JIA Quanli School of Materials Science of Engineering Henan Key laboratory of High Temperature Functional Ceramics Zhengzhou University

AlO-SiC-C castables have been successfully used in blast furnace troughs, but their slag resistance and thermal shock resistance still need to be further improved. Furthermore, ball pitch was commonly used as carbon source in the ASC castables, however,release of hazardous benzo（a）pyrene during its pyrosis process was detrimental to environment and human health. Herein, nontoxic carbon black was introduced in the ASC castables, and effect of carbon black on the properties of the castables were investigated in this work. The results show that on increasing of carbon black from 0.5% to 2%, apparent porosity of the samples after firing in reducing atmosphere decreased,cold strength increased, hot strength and residual strength ratio decreased, but their slag resistance enhanced noticeably. The reasons can be ascribed to nanosized carbon black can effectively fill the pores to decrease apparent porosity and to improve the density of the castables, in addition, SiC fibers can be formed and developed a continuous network structure, those are beneficial to improve cold strength, thermal shock resistance and slag resistance of the ASC castables.

关键词： Al2O3-SiC-C castables carbon black corrosion resistance BF trough Si C whiskers

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Effect of Zn（OH）2 Addition on The Properties of Corundum-Spinel Castables

Effect of Zn（OH）2 Addition on The Properties of Corundum-S...

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第九届国际耐火材料学术会议

作者： DONG Yifan SANG Mengyang LIU Jintong QIU Xin LIU Xinhong JIA Quanli School of Materials Science and Engineering Henan Key Laboratory of High Temperature Functional CeramicsZhengzhou University

Corundum-spinel based purging plugs are widely utilized in refining steel ladles, however, they were usually fired at high temperature, which required high energy consumption. More importantly, their dense structure and higher strength easily resulted in fracture or thermal spalling, which greatly limited their improvement of service life. Recently, unfired purging plug have been tried out by some manufacturers, unfortunately, there are some shortcomings including low strength at medium temperatures and poor volume stability, which easily lead to short life and lower blowing rate of unfired purging plug, thereby restricting their *** to improving the strength at intermediated temperature and volume stability of unfired purging plug, effect of Zn（OH） on the performance of the castables was investigated. The results are that on the increase of Zn（OH） content in the castables, cold strength of the specimens sintered at different temperatures remarkably increased, for instance,CMOR values of the specimens sintered at 800 °C increased from 3.19 MPa to 14.98 MPa. PLC of the sample decreased, HMOR also noticeably *** strength of the samples at intermediated temperatures can be remarkably enhanced by adding Zn（OH）, the reasons can be ascribed to the formation of ZnCrO and Zn AlO via the reaction of ZnO derived from the decomposition of Zn（OH） and CrOand AlO, which favor densification process of the matrix structure, creating strength reinforcing effect,thereby significantly increasing their strength at intermediated temperature.

关键词： corundum-spinel castables purging plug Zn(OH)2 mediated temperature strength

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Recent advances of vanadium-based cathode materials for zinc-ion batteries

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Chinese Chemical Letters 2021年第12期32卷 3753-3761页

作者： Xuerong Li Haoyan Cheng Hao Hu Kunming Pan Tongtong Yuan Wanting Xia School of Materials Science and Engineering Henan University of Science and TechnologyLuoyang 471023China Henan Key Laboratory of High-temperature Structural and Functional Materials National Joint Engineering Research Center for Abrasion Control and Molding of Metal MaterialsHenan University of Science and TechnologyLuoyang 471003China

Zn-ion batteries(ZIBs) have gained great attention as promising next-generation power sources, because of their low cost, enviable safety and high theoretical capacity. Recently, massive researches have been devoted to vanadium-based materials as cathodes in ZIBs, owing to their multiple valence states, competitive gravimetric energy density, but the capacity degradation, sluggish kinetics, low operating voltage hinder further optimization of their performance in ZIBs. This review summarizes recent progress to increase the interlayer spacing, structural stability, and the diffusion ability of the guest Zn ions, including the insertion of different ions, introduction of defects, design of diverse morphologies, the combination of other materials. We also focus on approaches to promoting the valuable performance of vanadiumbased cathodes, along with the related ongoing scientific challenges and limitations. Finally, the future perspectives and research directions of vanadium-based aqueous ZIBs are provided.

关键词： Aqueous zinc-ion batteries Vanadium-based materials Cathodes Energy storage Design strategy

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Performance of Adsorbents for NO_(2) in Furnace Flue Gas

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China's Refractories 2023年第3期32卷 26-30页

作者： KONG Yuan LI Xiang FU Jie YANG Lujun WANG Anxiu KANG Jialiang SUO Dong TIAN Shishuai MA Chengliang Henan Key Laboratory of High Temperature Functional Ceramics School of Materials Science and EngineeringZhengzhou UniversityZhengzhou 450052China Sanmenxia Electro-Melted Corundum Co. Ltd.Sanmenxia 472400China

To meet the emission standard of nitrogen oxides(NOx)in the flue gas of batch furnaces through dry adsorption,a calcium-silica inorganic adsorbent was prepared with limestone and quartz as raw *** Cu-BTC 1#was obtained by solvothermal synthesis,drying and purification in vacuum at 120℃using trimesic acid(H3BTC)and copper nitrate trihydrate(Cu(NO_(3))2·3H_(2)O)as raw materials;likewise,sample Cu-BTC 3#was obtained at 200℃.Sample Cu-BTC 2#was obtained by hydrothermal synthesis,drying and purification in air(metal-organic frameworks,1,3,5-benzene tricarboxylic acid copper).The two types of materials were tested in terms of the NO_(2) adsorption,and then the specific surface area,pore volume,NO_(2) adsorption performance,phase composition,microstructure and thermal stability of the adsorbent materials were exploredvia N_(2) physical adsorption-desorption,SEM,XRD and TG *** results show that:(1)the Cu-BTC samples have higher adsorption capacity than the calcium-silica adsorbent,in which sample Cu-BTC 3#has the largest specific surface area and pore volume,thus adsorption capacity for NO_(2);(2)the calcium-silica adsorbent has better thermal stability and lower total mass loss during the entire process than the Cu-BTC samples;sample Cu-BTC 2#has the best thermal stability among the three Cu-BTC samples,and the metal Cu active sites of the Cu-BTC samples can be exposed at least above 150℃.

关键词： nitrogen oxide(NOx) Cu-BTC calcium-silica inorganic adsorbent adsorption capacity specific surface area thermal stability

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Different surface modification methods and coating materials of zinc metal anode

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Journal of Energy Chemistry 2022年第3期31卷 397-412,I0011页

作者： Feng Tao Yong Liu Xinyuan Ren Jing Wang Yazhou Zhou Yingjie Miao Fengzhang Ren Shizhong Wei Jianmin Ma Provincial and Ministerial Co-construction of Collaborative Innovation Center for Non-ferrous Metal New Materials and Advanced Processing Technology Henan Key Laboratory of Non-Ferrous Materials Science&Processing TechnologySchool of Materials Science and EngineeringHenan University of Science and TechnologyLuoyang 471023HenanChina National Joint Engineering Research Center for Abrasion Control and Molding of Metal Materials Henan Key Laboratory of High-Temperature Structural and Functional MaterialsHenan University of Science and TechnologyLuoyang 471003HenanChina School of Art&Design Henan University of Science and TechnologyLuoyang 471023HenanChina School of Physics and Electronics Hunan UniversityChangsha 410082HunanChina School of Materials and Energy University of Electronic Science and Technology of ChinaChengdu 611731SichuanChina

Rechargeable aqueous Zn-ion batteries(AZIBs)are one of the most promising energy storage devices for large-scale energy storage owing to their high specific capacity,eco-friendliness,low cost and high ***,zinc metal anodes suffer from severe dendrite growth and side reactions,resulting in the inferior electrochemical performance of *** address these problems,surface modification of zinc metal anodes is a facile and effective method to regulate the interaction between the zinc anode and an *** this review,the current challenges and strategies for zinc metal anodes are ***,recent advances in surface modification strategies to improve their electrochemical performance are concluded and ***,challenges and prospects for future development of zinc metal anodes are *** hope this review will be useful for designing and fabricating highperformance AZIBs and boosting their practical applications.

关键词： Zn-ion batteries Zinc metal anode Surface modification Solvent casting method Wet chemistry method

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Densification, microstructure, and mechanical properties of WMo–Al2O3 alloy fabricated by spark plasma sintering

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Ceramics International 2025年

作者： Cui, Liya Wang, Changji Wei, Shizhong Dou, Caihong Zhao, Ziwen Chen, Chong Dong, Di Pan, Kunming School of Materials Science and Engineering Henan University of Science and Technology Luoyang471000 China Longmen Laboratory Luoyang471000 China Henan Key Laboratory of High-temperature Structural and Functional Materials Henan University of Science and Technology Luoyang471003 China Advanced Technology & Materials Co. Ltd Beijing100081 China

In the spark plasma sintering process, different sintering temperatures (1500–1900 °C) and sintering times (6–20 min) were used for the consolidation of WMo–Al2O3 powder. The results show that the highest relative density of the WMo–Al2O3 alloy was stable at 96 % when the sintering temperature was 1600 °C and the holding time was 10 min;under these conditions, the alloy had no obvious change in phases and a grain size of 0.73 μm. The stress exponent (n) of the diffusion process was less than 0.5, indicating that the densification mechanism of WMo–Al2O3 alloy is atomic diffusion between grain boundaries and particle rearrangement caused by grain boundary slip. The microhardness of the WMo–Al2O3 alloy first increased and then decreased with increasing temperature, which was attributed to the low density, resulting in low microhardness at low sintering temperatures. In addition, the microhardness increased with increasing relative density. When the temperature was further increased and the relative density remained unchanged, the WMo–Al2O3 alloy grain size increased and the hardness decreased. Under holding at 1600 °C for 10 min, the grain size was 0.73 μm, the hardness reached 721.3 HV, and the relative density reached 96.45 %. A transition layer existed in the interface region between the WMo solid solution and the Al2O3 particles, formed by mutual diffusion and reaction between the Al2O3 particles and the WMo matrix. The phase boundary indicated a good combination of Al2O3 particles with the WMo matrix, and the width of the interface bonding region was approximately 5 nm. © 2025 Elsevier Ltd and Techna Group S.r.l.

关键词： Densification

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Properties of New Zirconia-based Composites for Glass Kilns

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China's Refractories 2024年第4期33卷 29-33页

作者： LIANG Xinxing YE Hang GAO Yuying ZHAN Lei MA Chengliang LIU Xiaogang FAN Chongfang XU Enxia DING Qiang LI Yongsheng Zhengzhou Fangming High Temperature Ceramic New Material Co. Ltd.Zhengzhou 452370China RHI Magnesita(China)Co. Ltd.Shanghai 200021China School of Material Science and Engineering Henan Key Laboratory of High Temperature Functional MaterialsZhengzhou UniversityZhengzhou 450052China School of Materials Science and Technology East China University of Science and TechnologyShanghai 200237China

To provide a material with excellent comprehensive properties for the glass kiln melting pools,zirconia powder and alumina powder were fully mixed according to the ratio of m(ZrO_(2)):m(Al_(2)O_(3))=4:1 and fused in an arc *** obtained fused zirconia-corundum eutectic material was processed into different particle sizes,batched according to a certain particle size distribution and mixed *** pressure molding and firing at 1750℃,new zirconia-based composites were *** phase composition and microstructure of the composites were *** molten glass corrosion resistance of the composites was compared with that of zirconia corundum bricks 33#and 41#.The results show that the new zirconia-based composites have a dense structure,high chemical purity without low melting point components,and good thermal shock *** with zirconia corundum bricks 33#and 41#,after being corroded by high temperature molten glass,the new composites have no corrosion cavities,needle-like pores,defects or liquid phase infiltration,and no reaction with molten glass,showing good corrosion resistance to molten glass.

关键词： glass kiln zirconia-based composites thermal shock resistance corrosion resistance

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