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Energy Consumption and erosion mechanism of Polyester Fiber Reinforced Cement Composite in Wind-blown Sand Environments

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Journal of Wuhan University of Technology(Materials Science) 2022年第4期37卷 666-676页

作者： HAO Yunhong LIU Yanchen LI Yonggui GAO Feng School of Science Inner Mongolia University of TechnologyHohhot 010051China The Inner Mongolia Key Laboratory of Civil Engineering Structure and Mechanics Fuzhou 350108China The Inner Mongolia Autonomous Region Construction Inspection and Appraisal and Safety Assessment Engineering Technology Research Center Hohhot 010051China Fujian Key Laboratory of Novel Functional Textile Fibers and Materials Minjiang UniversityHohhot 010051China School of Civil Engineering Inner Mongolia University of TechnologyHohhot 010051China

Considering the economic and environmental benefits associated with the recycling of polyester(PET)fibres,it is vital to study the application of fibre-reinforced cement *** to the characteristics of the wind-blown sand environment in Inner Mongolia,the erosion resistance of the polyester fibre-reinforced cement composites(PETFRCC)with different PET fibre contents to various erosion angles,velocities and sand particle flows was investigated by the gas-blast *** on the actual conditions of sandstorms in Inner Mongolia,the sand erosion parameters required for testing were calculated by the similarity *** elastic-plastic model and rigid plastic model of PETFRCC and cement mortar were established,and the energy consumption mechanism of the model under particle impact was *** experimental results indicate that the microstructure of PETFRCC rafter hydration causes a spring-like buffering effect,and the deformation of PETFRCC under the same impact load is slightly smaller than that of cement mortar,and the damage mechanism of PETFRCC is mainly characterized by fiber deformation and slight brittle spalling of *** under the most unfavorable conditions of the erosion,the erosion rate of 0.5PETFRCC is about 57.69%lower than that of cement mortar,showing better erosion resistance.

关键词： wind-blown sand environment erosion resistance polyester fibre-reinforced cement composite energy consumption mechanism erosion mechanism

Effect of La_(2)Sn_(2)O_(7)content on Ag-La_(2)Sn_(2)O_(7)/SnO_(2)arc erosion behavior and mechanism

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Journal of Rare Earths 2022年第9期40卷 1488-1498,I0006页

作者： Mengli Cao Yi Feng Lili Wang Ting Zhao Hao Zhao Zijue Zhou School of Materials Science and Engineering Hefei University of TechnologyHefei 230009China

La_(2)Sn_(2)O_(7)/SnO_(2)powder was synthesized by chemical co-precipitation method,and Ag-La_(2)Sn_(2)O_(7)/SnO_(2)composites were prepared by hot-pressing *** electrical resistivity,density,Brinell hardness and flexural strength of Ag-La_(2)Sn_(2)O_(7)/SnO_(2)composites were ***,the effect of La_(2)Sn_(2)O_(7)content on the arc erosion behavior of Ag-La_(2)Sn_(2)O_(7)/SnO_(2)composites at 7 kV voltage was *** the increase of La_(2)Sn_(2)O_(7)content,the arc duration and arc energy decrease,and the breakdown strength *** surface morphology of Ag-La_(2)Sn_(2)O_(2)/SnO_(2)composites after arc erosion was investigated using scanning electron microscopy and three-dimensio nal laser confocal scanning *** the increase of La_(2)Sn_(2)O_(7)content,the smaller the erosion damage,the better the anti-arc erosion ***,too much La_(2)Sn_(2)O_(7)results in the decrease of Ag-La_(2)Sn_(2)O_(7)/SnO_(2)properties and severe arc erosion.X-ray photoelectron spectroscopy was used to determine the composition of the erosion *** effect of La_(2)Sn_(2)O_(7)on wettability between Ag and SnO_(2)was investigated,and the erosion mechanism of Ag-La_(2)Sn_(2)O_(7)/SnO_(2)composites was discussed *** study can provide a reference for the application of Ag matrix electrical contact materials in high-voltage electrical appliances.

关键词： Ag-La_(2)Sn_(2)O_(7)/SnO_(2)composites Arc erosion behavior erosion mechanism Rare earths

Effect of Al content on high temperature erosion properties of arc-sprayed FeMnCrAl/Cr_3C_2 coatings

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Transactions of Nonferrous Metals Society of China 2010年第2期20卷 201-206页

作者：罗来马刘少光俞佳罗娟郦剑 Department of Materials Science and Engineering Zhejiang University Wenzhou Cadre New Special Material Co. Ltd.

Three types of FeMnCrAl/Cr3C2 coatings with different AI content were deposited on 20# steel substrates by the high velocity arc spraying （HVAS） process. Surface microstructures of the coatings were analyzed by optical microscopy （OM） and X-ray diffractometry （XRD）. High temperature erosion （HTE） tests were performed in an erosion tester at different impact angles. The surface morphologies of the eroded coatings were observed on a field emission scanning electron microscope（FE-SEM）. The laminated structure is found on all the prepared coatings with the porosity and oxide fraction in the coatings decreasing with the Al content from 0 to 15% （mass fraction）. Sample FA3 with 15% Al, possessing the lowest porosity and oxide fraction, has the best HTE resistance, which demonstrates that Al addition can improve the HTE resistance of the coatings. The erosion rate of sample FA1 exhibits a maximum value at 90° impact angle. The maximum erosion rates of both FA2 and FA3 samples appear in the range of 60°-90° impact angles. erosion loss of the coatings occurs through brittle breaking, cutting and fatigue spalling.

关键词： high velocity arc spraying (HVAS) coating erosion mechanism high temperature erosion(HTE)

Research on the solid particle erosion wear of pipe steel for hydraulic fracturing based on experiments and numerical simulations

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Petroleum Science 2024年第4期21卷 2779-2792页

作者： Si-Qi Yang Jian-Chun Fan Ming-Tao Liu De-Ning Li Jun-Liang Li Li-Hong Han Jian-Jun Wang Shang-Yu Yang Si-Wei Dai Lai-Bin Zhang State Key Laboratory of Oil and Gas Equipment CNPC Tubular Goods Research InstituteXi'an710077ShaanxiChina Key Laboratory of Oil and Gas Safety and Emergency Technology China University of PetroleumBeijing102249China Oil Production Technology Research Institute of Liaohe Oilfield Company Panjin124010LiaoningChina Tianjin Gas Storage Branch PetroChina Dagang Oilfield CompanyTianjin300280China Petroleum Production Engineering Research Institute Daqing Oilfield CompanyDaqing163712HeilongjiangChina

erosion wear is a common failure mode in the oil and gas *** the hydraulic fracturing,the fracturing pipes are not only in high-pressure working environment,but also suffer from the impact of the high-speed solid particles in the fracturing *** such complex conditions,the vulnerable components of the pipe system are prone to perforation or even burst accidents,which has become one of the most serious risks at the fracturing ***,it is not yet fully understood the erosion mechanism of pipe steel for hydraulic ***,this article provides a detailed analysis of the erosion behavior of fracturing pipes under complex working conditions based on experiments and numerical ***,we conducted erosion experiments on AISI 4135 steel for fracturing pipes to investigate the erosion characteristics of the *** effects of impact angle,flow velocity and applied stress on erosion wear were comprehensively *** a particle impact dynamic model of erosion wear was developed based on the experimental parameters,and the evolution process of particle erosion under different impact angles,impact velocities and applied stress was *** combining the erosion characteristics,the micro-structure of the eroded area,and the micro-mechanics of erosion damage,the erosion mechanism of pipe steel under fracturing conditions was studied in detail for the first *** high-pressure operating conditions,it was demonstrated through experiments and numerical simulations that the size of the micro-defects in the eroded area increased as the applied stress increased,resulting in more severe erosion wear of fracturing pipes.

关键词： erosion wear Applied stress Particle impact dynamics erosion mechanism

Particle erosion of infrared materials

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Journal of University of Science and Technology Beijing 2008年第6期15卷 758-763页

作者： Qi He Fanxiu Lv Fenglei Zhang Huibin Guo Junjun Wei School of Materials Science and Engineering University of Science and Technology Beijing Beijing 100083 China

erosion test of some infrared （IR） optical crystals （Ge, ZnS, MgF2, and quartz） was conducted with a number of different erodents （glass bead, and angular SiC, SiO2, Al2O3） by a homemade gas-blasting erosion tester. The influence of impact angle, impact velocity, erodent, and erosion time on the erosion rate and the effect of erosion on their IR transmittance were studied. The dam- aged surface morphology was characterized by scanning electron microscopy, and the erosion mechanism was explored. All of the materials show the maximum in wear versus impact angle at 90°, confirming their brittle failure behavior. It is found that the erosion rate is dependent on the erodent velocity by a power law, and it is highly correlated to the hardness of the erodent. The erosion rate-time curves do not show an incubation state, but an accelerated erosion period followed a maximum erosion （steady state）. The decrease of IR transmittance is direct proportion to the erosion rate. Although the material loss occurs primarily by brittle process, ductile behavior is clearly an important feature, especially for MgF2 and ZnS.

关键词： solid particle erosion infrared optical materials erosion mechanism infrared transmittance

Facile recycling of anhydride-cured epoxy thermoset under mild conditions with multifunctional hydrazine hydrate

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Chinese Chemical Letters 2023年第12期34卷 231-235页

作者： Beitao Liu Qi Cao Jiahui Li Xigao Jian Zhihuan Weng State Key Laboratory of Fine Chemicals Frontiers Science Center for Smart MaterialsLiaoning Technology Innovation Center of High Performance Resin MaterialsDepartmentof Polymer Science&EngineeringDalian University of TechnologyDalian 116024China

Environmental economics is accelerating the urgency to develop recycling technologies for the ever-growing quantity of discarded thermoset ***,we developed a mild and energy-saving pro-cess for high-eficiency degradation and reuse of anhydride-cured epoxy thermoset with the aid of hy-drazine *** degradation degree of the epoxy resin reached 99.6%at 120℃ within a short time of *** the reaction,the ester bonds in the cross-linked network were selectively cleaved by the amination of hydrazine hydrate,and the epoxy resin was fully converted to new monomers that con-tained hydrazide and hydroxyl groups,***,the degradation mechanism of the epoxy resin in hydrazine hydrate was studied and a nucleation model was utilized to predict the actual degra-dation behavior of the ***,the degradation products can be directly mixed with epoxy precur-sor to prepare a new waterborne epoxy coating with good comprehensive *** work not only demonstrates a new way to realize the efficient degradation of epoxy resins,but also provides a facile and efficient recycling protocol for thermosets.

关键词： Anhydride-cured epoxy resin Degradation Recycling erosion mechanism Waterborne epoxy coating

Reanalysis on the Spectral Characteristics and Materials of Jade Jue Unearthed from Lijiashan Ancient Tomb in Yunnan Province, China

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宝石和宝石学杂志（中英文） 2024年第2期26卷 48-55页

作者： Ting Fang Jifu Liu Mingxing Yang Gemmological Institute China University of GeosciencesWuhan 430074China Hubei Key Research Base of Humanities and Social Sciences--Center for Jewelry Heritage and Innovation Wuhan 430074China

Jade ware Jue is one of the most fashionable ornament in ancient China from the Neolithic Age to the Han *** this study,the remnants of jade ware Jue,from Lijiashan ancient tomb group have been tested and analyzed *** samples through a light etch surface showing glass luster and those with a severe etch surface showing earthen *** the aid of X-ray fluorescence Spectrometer(X-ray Fluorescence)test and X-ray diffraction(XRD)detection,the results show that tremolite is not the main mineral of the *** main components of the tested samples with light erosion are antigorite and talc,although the main components of the samples with severe erosion are calcite containing calcium carbonate ***,the research on jade ware Jue in Yunnan culture has not only contributed to our further understanding of the jade objects from Yunnan culture and the variety of jade material located in the Yunnan *** also provides a basis for the trace of the history and culture through the distribution and evolution of burial hierarchy *** the same time,the microscopic observation of the tested samples manifested a residual trace of“string”at the perforation,which has played a critical role in restoring the wearing of jade ware Jue from the tombs of the ancient Yunnan State and the handicraft skills at that time.

关键词： Dian culture jade Jue corroded ancient jade XRD erosion mechanism Yunnan,China