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Lightweight epoxy-based abradable seal coating with high bonding strength

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Journal of Materials Science & Technology 2021年第10期69卷 129-137页

作者： yun-qi tong qiu-Sheng Shi Mei-Jun Liu Guang-Rong Li Chang-Jiu Li Guan-Jun Yang State Key Laboratory for Mechanical Behavior o f Materials School of Materials Science and EngineeringXi'an Jiaotong UniversityXi'an710049China

To gain high efficiency and low fuel consumption, aluminum-based abradable seal coatings had been widely used in the compressor casing of aero engines or gas turbines owing to the low elastic modulus. However, the adhesive transfer phenomenon frequently occurs when the radial rubbing generates between titanium alloy blade tips and aluminum-based coating. It tends to increase scratch force and results in blades vibration and even engine jam. To eliminate this problem, a new lightweight epoxy-based abradable seal coating with high bonding strength was developed by an effective and porosity controllable mixing process that distributes spherical pores uniformly in the continuous matrix. A lightweight coating of 63% porosity with a hardness of 33.1(HR15 Y) can be reached when the content of hollow microspheres is 31 wt.%. The coating density is 0.5 g/cm3 and the bonding strength is as high as 18 *** performance of the epoxy-based coating is comprehensively better than aluminum-based coatings in five essential indices. This study is expected to provide a new technical path for obtaining high-quality abradable seal coatings to guarantee the efficient and safe operation of compressors.

关键词： Epoxy-based seal coating Porosity HR15Y Lightweight High bonding strength

Critical firing conditions for titanium alloys by molten droplet ignition

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Corrosion Communications 2023年第3期11卷 33-43页

作者： Lin Chen Yu Dong yun-qi tong Mei-Jun Liu Guan-Jun Yang State Key Laboratory for Mechanical Behavior of Materials School of Materials Science and Engineering Xi'an Jiaotong University

Reliable service of indispensable titanium alloys in aeroengines is limited by titanium fire with unclear critical *** this study,critical conditions in the form of parameter phase diagrams for secondary burning were determined by molten droplet *** element analysis（FEA） reveals that the molten droplet size（R0）,relative oxygen content（Pr）,and initial temperature（T0） significantly affect titanium fire following power exponential *** addition,Prand T0affect ablation synergically,and a unified empirical relationship for critical ablation of titanium alloy is ***,the critical T0of a typical TC4 alloy under 20%Pris higher than 973 K,which explains the reliable service performance of TC4 alloy at ≤ 873 K in compressors in commerical air *** addition,the critical empirical conditions are consistent with the FEA results,and the deviation occurs due to oxidation at T0≥ 673 ***,the ablated TC4 alloy can be divided into five characteristic zones,and loose and porous oxide scales are formed at the front of the titanium *** present study points the way towards long-lifetime services of TC4 alloys through sound titanium fire protection strategies.

关键词： Titanium fire Ablation Molten droplet ignition Critical conditions Scaling law

Improving fire retardancy of Ti alloys with a refractory ceramic barrier layer

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Corrosion Communications 2023年第4期12卷 19-28页

作者： Lin Chen Yu Dong yun-qi tong Mei-Jun Liu Guan-Jun Yang State Key Laboratory for Mechanical Behavior of Materials School of Materials Science and Engineering Xi'an Jiaotong University

Reliable service of indispensable titanium alloys in aeroengines is limited by the bottleneck problem of titanium fires. In this study, a tri-layer fire retardant coating with a bi-functional ceramic barrier layer is proposed to suppress titanium fire. Results show that the current coating can increase the fire retardant temperature by ≥300 K under droplet ignition. Thermal barrier effect of the YSZ refractory ceramic layer significantly reduces Ti alloy temperature, and oxygen barrier effect prevents active Ti from directly contacting oxygen during the entire ablation process. Therefore, the two barrier effects effectively prevent occurrence of titanium fire. In addition,dissolution of the Ni-based abradable seal coating makes burning TC4 molten droplet extinguished in a short time, thus further inhibiting titanium fire ignition. The present study provides an effective method for reliable service and titanium fire-resistant design of titanium alloys.

关键词： Ceramic barrier coating Abradable seal coating Fire retardant Ablation Melting

The transcriptome of MHV-infected RAW264.7 cells offers an alternative model for macrophage innate immunity research

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Animal Models and Experimental Medicine 2025年第1期8卷 57-66页

作者： yun Liu Ting-Ting Feng Wei tong Zhi Guo Xia Li qi Kong Zhi-Guang Xiang Institute of Laboratory Animal Sciences Chinese Academy of Medical Sciences(CAMS)and Comparative Medicine CenterPeking Union Medical College(PUMC)BeijingP.R.China

Background:Macrophages are the primary innate immune cells encountered by the invading coronaviruses,and their abilities to initiate inflammatory reactions,to main-tain the immunity homeostasis by differential polarization,to train the innate immune system by epigenic modification have been reported in laboratory animal ***:In the current in vitro research,murine macrophage RAW 264.7 cell were infected by mouse hepatitis virus,a coronavirus existed in *** 3-,6-,12-,24-,and 48-h post infection(hpi.),the attached cells were washed with PBS and harvested in Trizol *** The harvest is subjected to transcriptome ***:The transcriptome analysis showed the immediate(3 hpi.)up regulation of DEGs related to inflammation,like Il1b and *** related to M2 differential po-larization,like Irf4 showed up regulation at 24 hpi.,the late term after viral *** addition,DEGs related to metabolism and histone modification,like Ezh2 were de-tected,which might correlate with the trained immunity of ***:The current in vitro viral infection study showed the key innated im-munity character of macrophages,which suggested the replacement value of viral infection cells model,to reduce the animal usage in preclinical research.

关键词： coronavirus innate immunity macrophage transcriptome

Nickel-copper alloying arrays realizing efficient co-electrosynthesis of adipic acid and hydrogen

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Journal of Energy Chemistry 2025年第02期101卷 7-15页

作者： Xuhui Ren qianyu Zhang yun tong Guorong Zhou Cong Lin Yanying Zhao Pengzuo Chen School of Chemistry and Chemical Engineering Key Laboratory of Surface & Interface Science of Polymer Materials of Zhejiang Province Zhejiang Sci-Tech University

Constructing electrocatalytic overall reaction technology to couple the electrosynthesis of adipic acid with energy-saving hydrogen production is of significant for sustainable energy ***,the development of highly-active bifunctional electrocatalysts remains a ***,3D hierarchical nickel-copper alloying arrays with dendritic morphology are manufactured by a simple electrodeposition process,standing for the excellent bifunctional electrocatalyst towards the co-production of adipic acid and H2from cyclohexanone and *** membrane-free flow electrolyzer of Cu0.81Ni0.19/NF shows the superior electrooxidation performance of ketone-alcohol（KA） oil with high faradaic efficiencies of over 90% for adipic acid and H2,robust stability over 200 h as well as a high yield of 0.6 mmol h-1for adipic acid at 100 mA ***-situ spectroscopy indicates the Cu0.81Ni0.19alloy contributes to forming more active NiOOH species to involve in the conversion of cyclohexanone to adipic acid,while the proposed reaction pathway undergoes the 2-hydroxycyclohexanone and 2,7-oxepanedione ***,the theoretical calculations confirm that the optimal electronic interaction,boosted reaction kinetics as well as improved adsorption free energy of reaction intermediates,synergistically endows Cu0.81Ni0.19alloy with superior bifunctional performance.

关键词： Adipic acid Cu0.81Ni0.19 alloy Cyclohexanone oxidation reaction Hydrogen evolution reaction Hydrogen fuel

Atmospheric reductive catalytic fractionation of lignocellulose integrated with one-pot catalytic conversion of carbohydrate yielding valuable lignin monomers and platform chemicals from corn straw

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Green Energy & Environment 2025年第1期10卷 161-172页

作者： Meng-Ying Liu Zhe-Hui Zhang Xue-qi Wang qian Sun Chen Zhang Yu Li Zhuohua Sun Katalin Barta Feng Peng tong-qi Yuan State Key Laboratory of Efficient Production of Forest Resources Beijing Forestry UniversityBeijing100083China Beijing Key Laboratory of Lignocellulosic Chemistry Beijing Forestry UniversityBeijing100083China Department of Chemistry Organic and Bioorganic ChemistryUniversity of GrazHeinrichstrasse 28/II8010 GrazAustria

Developing a cost-effective and environmentally friendly process for the production of valuable chemicals from abundant herbal biomass receives great attentions in recent ***,taking advantage of the“lignin first”strategy,corn straw is converted to valuable chemicals including lignin monomers,furfural and 5-methoxymethylfurfural via a two steps *** key of this research lies in the development of a green and low-cost catalytic process utilizing magnetic Raney Ni catalyst and high boiling point ethylene *** utilization of neat ethylene glycol as the sole slovent under atmospheric conditions obviates the need for additional additives,thereby facilitating the entire process to be conducted in glass flasks and rendering it highly convenient for scaling *** the initial step,depolymerization of corn straw lignin resulted in a monomer yield of 18.1 wt%.Subsequently,in a dimethyl carbonate system,the carbohydrate component underwent complete conversion in a one-pot process,yielding furfural and 5-methoxymethylfurfural as the primary products with an impressive yield of 47.7%.

关键词： Atmospheric reductive catalytic fractionation Corn straw Ethylene glycol Raney Ni 5-Methoxymethylfurfural

Enantioselective reductive conjugate alkenylation ofα,β-enones with keto alkenyl acetates by nickel catalysis

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Science China Chemistry 2025年第1期68卷 157-162页

作者： Rong-De He yun-Lei Luo qiu-Quan Pan qi-Wei Yao Xing-Zhong Shu State Key Laboratory of Applied Organic Chemistry College of Chemistry and Chemical EngineeringLanzhou UniversityLanzhou 730000China

Reactions involving alkenyl acetates offer cost-effective and environmentally friendly routes for alkene synthesis,yet their asymmetric variant remains ***,asymmetric conjugate alkenylation predominantly centered on nucleophilic addition using alkenyl–*** manuscript presents an asymmetric reductive conjugate alkenylation reaction involving alkenyl *** method facilitates the enantioselective addition of keto alkenyl groups toα,β-enones,resulting in the formation of unsaturated diketones—a class of useful structural motifs that are challenging to access *** use of electron-rich Pyroxy ligand is essential for achieving both high reaction efficiency and enantioselectivity.

关键词： nickel alkenylation asymmetric cross-coupling alkenes

Unraveling the role of long non‑coding RNAs in chronic heat stress‑induced muscle injury in broilers

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Journal of Animal Science and Biotechnology 2025年第1期16卷 206-217页

作者： Zhen Liu Yingsen Liu tong Xing Jiaolong Li Lin Zhang Liang Zhao yun Jiang Feng Gao College of Animal Science and Technology Key Laboratory of Animal Origin Food Production and Safety Guarantee of Jiangsu ProvinceJiangsu Collaborative Innovation Center of Meat Production and ProcessingQuality and Safety ControlNanjing Agricultural UniversityNanjing 210095People’s Republic of China Anhui Key Laboratory of Livestock and Poultry Product Safety Engineering Institute of Animal Husbandry and Veterinary MedicineAnhui Academy of Agricultural SciencesHefei 230031China Institute of Agro‑Products Processing Jiangsu Academy of Agricultural SciencesNanjing 210014People’s Republic of China School of Food Science and Pharmaceutical Engineering Nanjing Normal UniversityNanjing 210023People’s Republic of China

Background Chronic heat stress(CHS)is a detrimental environmental stressor with a negative impact on the meat quality of ***,the underlying mechanisms are not fully *** study investigates the effects of CHS on long non-coding RNA(lncRNA)expression and muscle injury in broilers,with a focus on its implications for meat *** The results showed that CHS diminished breast muscle yield,elevated abdominal fat deposition,induced cellular apoptosis(P<0.05),and caused *** analysis revealed 151 differentially expressed(DE)lncRNAs when comparing the normal control(NC)and HS groups,214 DE lncRNAs when comparing the HS and PF groups,and 79 DE lncRNAs when comparing the NC and pair-fed(PF)*** eliminating the confounding effect of feed intake,68 lncRNAs were identified,primarily associated with cellular growth and death,signal transduc-tion,and metabolic ***,the apoptosis-related pathway P53,lysosomes,and the fibrosis-related gene TGF-β2 were significantly upregulated by *** These findings indicate that chronic heat stress induces cellular apoptosis and muscle injury through lncRNA,leading to connective tissue accumulation,which likely contributes to reduced breast muscle yield and meat quality in broilers.

关键词： Apoptosis Broiler Chronic heat stress LncRNA Muscle

Tandem asymmetric dearomatized functionalization reaction of phenols with Evans-ynamides enabled by divergent electrophiles

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Science China Chemistry 2025年第2期68卷 649-660页

作者： Ying-qi Zhang Gan-Lu qian yun Liu Jia-Hui Li Xin Hong Zhou Xu Bo Zhou Long-Wu Ye State Key Laboratory of Physical Chemistry of Solid Surfaces Key Laboratory of Chemical Biology of Fujian Provinceand College of Chemistry and Chemical EngineeringXiamen UniversityXiamen 361005China Center of Chemistry for Frontier Technologies Department of ChemistryState Key Laboratory of Clean Energy UtilizationZhejiang UniversityHangzhou 310027China Jiangsu Key Laboratory of New Drug Research and Clinical Pharmacy School of PharmacyXuzhou Medical UniversityXuzhou 221004China State Key Laboratory of Elemento-Organic Chemistry Nankai UniversityTianjin 300071China State Key Laboratory of Organometallic Chemistry Chinese Academy of SciencesShanghai 200032China

Herein,we disclose a highly regio-/chemoselective tandem asymmetric dearomatized halofunctionalization reaction of phenoltethered ynamides with diverse electrophilic halogenation sources in a catalyst-free manner for the practical and rapid assembly of a series of halogenated spirocyclic ***,the related dearomatized selenation and protonation are also achieved,affording the corresponding selenated and protonated spirocycles in high ***,the enantioselectivities of these products can be perfectly induced by Evans auxiliaries(99%ees).Significantly,this protocol not only represents the first tandem asymmetric halofunctionalization reaction of phenol derivatives,but also constitutes the first asymmetric halogenation/selenation of *** calculations indicate a remote induction model of Evans chiral auxiliary-attached keteniminium.

关键词： alkynes cyclization dearomatization Evans chiral auxiliary spirocycles