检索结果-南通市图书馆

High strength mullite-bond SiC porous ceramics fabricated by digital light processing

Journal of Advanced ceramics 2024年第1期13卷 53-62页

作者： Jian Sun Jingde Zhang Xu Zhang Zihe Li Jianzhang Li Sijie Wei Weibin Zhang Weili Wang Guifang Han Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials(Ministry of Education) School of Materials Science and EngineeringShandong UniversityJinan 250061China Key Laboratory of Special Functional Aggregated Materials Ministry of EducationShandong UniversityJinan 250100China Materials and Structures Research Centre Department of Mechanical EngineeringUniversity of BathBath BA27AYUK National Engineering Research Centre of ceramic Matrix co.posite Manufacture technology Xi’an Golden Mountain Ceramic Composites Co.Ltd.Xi’an 710118China School of Physics and Materials Science Changji UniversityChangji 831100China

Fabricating SiC ceramics via the digital light processing(DLP)technology is of great challenge due to strong light absorption and high refractive index of deep-co.ored SiC powders,which highly differ from those of resin,and thus significantly affect the curing performance of the photosensitive SiC slurry.In this paper,a thin silico. oxide(SiO_(2))layer was in-situ formed on the surface of SiC powders by pre-oxidation treatment.This method was proven to effectively improve the curing ability of SiC slurry.The SiC photosensitive slurry was fabricated with solid co.tent of 55 vol%and visco.ity of 7.77 Pa·s(shear rate of 30 s^(−1)).The curing thickness was 50μm with exposure time of only 5 s.Then,a well-designed sintering additive was added to co.pletely co.vert low-strength SiO_(2) into mullite reinforcement during sintering.co.plexshaped mullite-bond SiC ceramics were successfully fabricated.The flexural strength of SiC ceramics sintered at 1550℃in air reached 97.6 MPa with porosity of 39.2 vol%,as high as those prepared by spark plasma sintering(SPS)techniques.

关键词： digital light processing(DLP) SiC ceramics pre-oxidation mullite-bond SiC mechanical properties

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

co.posite structure Al_(2)O_(3)/Al_(2)O_(3)-YAG:Ce/YAG ceramics with high co.or spatial uniformity for white laser lighting

引用

Journal of Advanced ceramics 2024年第2期13卷 189-197页

作者： Pengfei Sang Le Zhang Jian Kang Mingzhou Li Shiwei Chen Peng Yang Bingheng Sun Yang Li Wieslaw Strek Hao Chen Jiangsu Key Laboratory of Advanced Laser Materials and Devices School of Physics and Electronics EngineeringJiangsu Normal UniversityXuzhou 221116China Jiangsu Xiyi Advanced Materials Research Institute of Industrial technology Xuzhou 221400China Xuzhou EAGLED technology co. Ltd.Xuzhou 221116China Xuzhou Kangna Advanced Materials technology co. Ltd.Xuzhou 221116China Xuzhou Fuchang Electronic technology co. Ltd.Xuzhou 221116China Shanghai Institute of Optics Fine Mechanics Chinese Academy of SciencesShanghai 201800China School of Material Science and Engineering Shanghai Institute of TechnologyShanghai 201418China State Key Laboratory of Crystal Materials Shandong UniversityJinan 250100China Institute of Low Temperature and Structure Research Polish Academy of SciencesWroclaw 50-422Poland

co.posite ceramic phosphor(CCP)is a candidate light-co.version material to obtain the high-quality laser lighting source.Phosphors based on the transmissive co.figuration model co.ld not simultaneously meet the requirements of angular co.or uniformity and high thermal stability.In this study,a novel co.posite structure ceramic was designed,including Al_(2)O_(3)-YAG:Ce/YAG layered ceramic with a size of 1 mm×1 mm for lighting,and Al_(2)O_(3) ceramic(φ=16.0 mm)was used as the wrapping material due to its outstanding thermal stability.The prepared ceramics exhibited excellent thermal performance and no yellow ring phenomenon.Through this design,we achieved the match of the intensity distribution of the blue and yellow lights,resulting in a high angular co.or uniformity of 0.9 with a view angle of±80°.All ceramics showed no luminous saturation phenomenon,even the laser power density was increased up to 47.51 W/mm^(2).A high-brightness white-light source with a luminous flux of 618 lm,a luminous efficiency of 126 lm/W,a CCT of 6615 K,and a CRI of 69.9 was obtained in the transmissive co.figuration.In particular,the surface temperature of the ceramic was as low as 74.1℃ under a high laser radiation(47.51 W/mm^(2)).These results indicate that Al_(2)O_(3)/Al_(2)O_(3)-YAG:Ce/YAG co.posite structure ceramic is a promising luminescent material in the high-power laser lighting applications.

关键词： Al_(2)O_(3)/Al_(2)O_(3)-YAG:Ce/YAG angular co.or uniformity high thermal stability high-power laser lighting

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Modified room temperature solid-state synthesis of yttria-stabilized zirco.ia(YSZ) nano-powders for solid oxide fuel cells

引用

稀土学报:英文版 2023年第9期41卷 1385-1391,I0004页

作者： Xiaoqian Xu Yurun Feng Zhaoyu Zhong Xue Guo Zhenhao Zhang Jiao Li Shikai Zhao Shigang Wu Haibin Sun School of Materials Science and Engineering Shandong University of TechnologyZibo 255000China shandong yasai ceramic technology co. Ltd.Jinan 271100China shandong Industrial ceramics Research&Design Institute co. Ltd.Zibo 255000China

High-performance solid oxide fuel cell(SOFC) is in urgent need of high-quality electrolyte powders with high reactivity and chemical uniformity.Here,8 mol% Y_(2)O_(3) doped ZrO_(2)(YSZ) nano-powders were synthesized by an improved solid-state reaction method at ambient temperature,and were applied to the fabrication of SOFC electrolytes.YSZ nano-powders show average grain sizes of ^(2)0 nm and high dispersibility,which is co.parable with or even better than some other chemical methods.Benefitting from their high reactivity,dense YSZ electrolytes(relative density of 97.9%) can be obtained at a relatively low sintering temperature of 1400℃.The optimized electrical co.ductivity reaches up to a high value of0.034 S/cm at 800 0C in air.The anode supported single cell with the co.struction of Ni-YSZ/YSZ/Sm_(0.2)Ce_(0.8)O_(2-δ)(SDC)/La_(0.6)Sr_(0.4)co.(0.2)Fe_(0.8)O_(3-δ)(LSCF) exhibits the peak power density of 0.827 W/cm^(2) at800℃ while taking wet H_(2) as fuels and ambient air as oxidants.

关键词： Room temperature solid-state reaction YSZ electrolyte High sintering activity High ionic co.ductivity Rare earths

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Pomegranate micro/nano hierarchical plasma structure for superior microwave absorption

引用

Nano Research 2022年第10期15卷 8688-8696页

作者： Chunyan Ding Tao Wu Xinsen Hu Chengshuai Shao Zhipeng Xu Hui Fu Songsong Wu Guangwu Wen Xiaoxiao Huang School of Materials Science and Engineering Shandong University of TechnologyZibo 255000China School of Materials Science and Engineering Harbin Institute of TechnologyHarbin 150001China shandong Industrial ceramics Research&Design Institute co. Ltd.Zibo 255000China shandong Institute of Advanced ceramic co. Ltd.Zibo 255000China

Inspired by the pomegranate natural artful structure,pomegranate micro/nano hierarchical plasma co.figuration of Fe/Fe3C@graphitized carbon(FFC/pCL)was co.structed based on the green sol-gel method and in-situ chemical vapor deposition(CVD)synthesis protoco..Pomegranate-like FFC/pCL successfully overcame the agglomeration phenomenon of magnetic nanoparticles with each seed of the pomegranate co.sisting of Fe/Fe_(3)C as co.es and graphitized carbon layers as shells.The high-density arrangement of magnetic nanoparticles and the design of pomegranate-like heterostructures lead to enhanced plasmon resonance.Thus,the pomegranate-like FFC/pCL achieved a great electromagnetic wave(EMW)absorbing performance of 6.12 GHz wide band absorption at a low mass adding of only 16.7 wt.%.Such excellent EMW performance can be attributed to its unique pomegranate hierarchical plasma co.figuration with separated nanoscale iron co.es,surface porous texture,and good carbon co.ductive network.This investigation provides a new paradigm for the development of magnetic/carbon based EMW absorbing materials by taking advantage of pomegranate hierarchical plasma co.figuration.

关键词： electromagnetic wave absorption low filler loading carbon shell network structure magnetic Fe/Fe3C

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Experimental Testing of Greenhouse-Integrated Vanadium-Titanium Black ceramic Solar Absorbers

引用

Journal of Thermal Science 2022年第6期31卷 1891-1902页

作者： DING Ding LIU Chunlu WANG Qichun ZHAO Zhibin XU Jianhua CAO Shuliang School of Architecture and Civil Engineering Xihua UniversityChengdu 610039China School of Architecture and Built Environment Deakin UniversityGeelongVictoria 3220Australia Advanced Materials Institute Qilu University of Technology(Shandong Academy of Sciences)Ji'nan 250014China shandong Lide Innovative Energy technology co. LtdJi'nan 251400China shandong Tianhong Arc Board co. LtdJi'nan 250014China

As a solution for solar heating, the low-co.t and long-life vanadium-titanium black ceramic solar absorbers have been used in rural co.struction. However, in co.trast to its high absorptance(0.93-0.97), ceramic also has high emissivity(approximately 90%) and low thermal co.ductivity(1.3 W/(m·K)). Without a glaze co.ering, ceramic absorbers cannot meet the industrial standard. This paper assumes that glaze co.ering can be substituted by insulation film in a solar greenhouse. To verify this assumption, field experiments were co.ducted. First, a traditional greenhouse in the Tacheng Basin, a severely co.d area in China, was renovated to improve its passive thermal performance. Then, 90 m^(2) of ceramic absorbers and floor co.ls as well as a water tank were installed inside the greenhouse, which made the entire co.struction act as an integrated solar co.lector. This heat co.lection and release system moderately increased the indoor air temperature(0.9℃-22.4℃) and substantially increased the soil temperature(15.5℃-31.2℃). The average daily useful heat gain under a daily solar insolation value of 17 MJ/m^(2) was 13.8 MJ, and the mean value of the co.lection efficiency was 0.81. Furthermore, the payback time of the project(7 years) is short, which is principally due to the low co.t of ceramic materials and the financial savings of the shared co.struction co.ponents(e.g., transparent co.er, metal frame and extra insulation). In co.clusion, the main co.tribution of this study is the verification that it is feasible to replace glaze co.ering with insulation film in a novel greenhouse-integrated vanadium-titanium black ceramic solar system.

关键词： greenhouse design solar absorber transparent film vanadium extraction ceramic co.ting

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Preparation of Thermal Insulation ceramics Using Felsic Tailings as Main Raw Material and Soda-ash Dregs as Flux

引用

Journal of Wuhan University of technology(Materials Science) 2023年第1期38卷 31-41页

作者：王志明 YAO Geng WANG Qiang ZHU Xiangnan QU Meiyun ZHAO Wei LIU Qing SUN Shaokang XIA Chuanbo 吕宪俊 School of Chemical and Biological Engineering Shandong University of Science and TechnologyQingdao 266590China shandong Institute of Geological Sciences Key Laboratory of Gold Mineralization Processes and Resource UtilizationMNRShandong Provincial Key Laboratory of Metallogenic Geological Process and Resource UtilizationJinan 250013China co.lege of Chemistry Chemical Engineering and Materials ScienceZaozhuang UniversityZaozhuang 277160China Jigang International Engineering&technology co. Ltd.Jinan 250101China

Low-co.t thermal insulation porous ceramics with uniform pore diameter and low bulk density were prepared with soda-ash dregs and felsic tailings.We investigated the effect of temperature,foaming agent,fluxing agent,Al_(2)O_(3)and CaO co.tent on the pore structure and crystal phase of porous ceramics.The effect of Ca^(2+)in soda-ash dregs on the preparation of quartz-feldspar based porous ceramics was studied.The results showed that the co.tribution of Ca^(2+)to the preparation of porous ceramics in this system was mainly to accelerate the Si-O bond fracture and reduce the sintering temperature at the initial stage of sintering,which destroyed the needle-like feldspar in the high temperature melt and reduced the melt visco.ity,thus reduced the foaming resistance and promoted the porous products with uniform pore size distribution.The Ca^(2+)co.tent on the high side can participate in the formation of crystals in sintering.The generated needle-like diopside and augite,which have small length-diameter ratio,will negligibly change in the visco.ity of melt at high temperatures,and their inhibition effect on pores is not as good as that of feldspar with large length-diameter ratio,resulting in the merger and co.lapse of pores.But the increase of diopside and augite can improve the co.pressive strength of porous products to some extent.Porous ceramic products co.taining needle-like feldspar phase can be prepared by using two kinds of solid waste,which can improve the co.pressive strength of the products and reduce the raw material co.t and energy co.sumption while co.prehensively utilizing the double solid waste.The optimal product has a bulk density of 0.45 g/cm^(3),a co.pressive strength of 3.17 MPa,and a thermal co.ductivity of 0.11 W/(m·K).

关键词： felsic tailings Ca-riched Soda-ash dregs low-co.t thermal insulation porous ceramics high co.tent of solid waste transformation of needle-like crystal phase

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Dynamic oxidation mechanism of carbon fiber reinforced SiC matrix co.posite in high-enthalpy and high-speed plasmas

引用

Journal of Advanced ceramics 2022年第2期11卷 365-377页

作者： Lingwei YANG Xueren XIAO Liping LIU Jie LUO Kai JIANG Xinxing HAN Changhao ZHAO Jun ZHANG Guolin WANG Hypervelocity Aerodynamics Institute China Aerodynamics Research and Development CenterMianyang 621000China Science and technology on Thermostructural co.posite Materials Laboratory Northwestern Polytechnical UniversityXi’an 710072China shandong Research and Design Institute of Industrial ceramics Co.Ltd.Zibo 255000China

This work employed an inductively co.pled plasma wind tunnel to study the dynamic oxidation mechanisms of carbon fiber reinforced SiC matrix co.posite(C_(f)/SiC)in high-enthalpy and high-speed plasmas.The results highlighted a transition of passive/active oxidations of SiC at 800–1600℃and 1–5 kPa.Specially,the active oxidation led to the co.rosion of the SiC co.ting and interruption of the SiO_(2) growth.The transition borders of active/passive oxidations were thus defined with respect to oxidation temperature and partial pressure of atomic O in the high-enthalpy and high-speed plasmas.In the transition and passive domains,the SiC dissipation was negligible.By multiple dynamic oxidations of C_(f)/SiC in the domains,the SiO_(2) thickness was not monotonously increased due to the co.peting mechanisms of passive oxidation of SiC and dissipation of SiO_(2).In addition,the mechanical properties of the SiC co.ting/matrix and the C_(f)/SiC were maintained after long-term dynamic oxidations,which suggested an excellent thermal stability of C_(f)/SiC serving in thermal protection systems(TPSs)of reusable hypersonic vehicles.

关键词： thermal protection system(TPS) ceramic matrix co.posite oxidation mechanism plasma wind tunnel mechanical property

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

K-doped Baco.(0.4)Fe_(0.4)Zr_(0.2)O_(3−δ) as a promising cathode material for protonic ceramic fuel cells

引用

Journal of Advanced ceramics 2022年第12期11卷 1988-2000页

作者： Peng QIU Bo LIU Lei WU Huiying QI Baofeng TU Jian LI Lichao JIA School of Materials Science and Engineering Shandong University of Science and TechnologyQingdao 266590China Center for Fuel Cell Innovation School of Materials Science and EngineeringState Key Lab of Materials Processing and Die&Mound TechnologyHuazhong University of Science and TechnologyWuhan 430074China co.lege of Chemical and Biological Engineering Shandong University of Science and TechnologyQingdao 266590China

Slow oxygen reduction reaction(ORR)involving proton transport remains the limiting factor for electrochemical performance of proton-co.ducting cathodes.To further reduce the operating temperature of protonic ceramic fuel cells(PCFCs),developing triple-co.ducting cathodes with excellent electrochemical performance is required.In this study,K-doped Baco.(0.4)Fe_(0.4)Zr_(0.2)O_(3−δ)(BCFZ442)series were developed and used as the cathodes of the PCFCs,and their crystal structure,co.ductivity,hydration capability,and electrochemical performance were characterized in detail.Among them,Ba_(0.9)K_(0.1)co.(0.4)Fe_(0.4)Zr_(0.2)O_(3−δ)(K10)cathode has the best electrochemical performance,which can be attributed to its high electron(e^(−))/oxygen ion(O^(2−))/H^(+)co.ductivity and proton uptake capacity.At 750℃,the polarization resistance of the K10 cathode is only 0.009Ω·cm^(2),the peak power density(PPD)of the single cell with the K10 cathode is close to 1 W·cm^(−2),and there is no significant degradation within 150 h.Excellent electrochemical performance and durability make K10 a promising cathode material for the PCFCs.This work can provide a guidance for further improving the proton transport capability of the triple-co.ducting oxides,which is of great significance for developing the PCFC cathodes with excellent electrochemical performance.

关键词： proton transport proton-co.ducting cathode protonic ceramic fuel cells(PCFCs) triple-co.ducting hydration capability

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

High-frequency dielectric properties of BSTO ceramic prepared with hydrothermal synthesized SrTiO_3 and BaTiO_3 powders

引用

Particuology 2009年第5期7卷 414-418页

作者： Yonghui Xing Hui Liang Xiaolei Li Liuqi Si Key LaboratoryforAdvanced ceramics and Machining technology of Ministry of Education Tianjin University Tianjin 300072 China shandong Sinocera Functional Material co. Ltd.. shandong Dongying 257091 China

BSTO dielectric ceramic was prepared from SrTi03 and BaTi03 powders synthesized by hydrothermal method, as well as from Bao.sSro.4TiO3 powder synthesized by co.ventional solid-state reaction. The former can be sintered at a relatively low temperature of 1120 ℃. Characterization by SEM showed that the grain shapes of both ceramics are cubical, though the grain size of the former is much smaller. Dielectric co.stants measured at 20℃ were shown to vary with frequency in the range from I kHz to 2 MHz and dc bias field, and further that the dielectric loss of the former to be less than 2 × 10^- 3 in the frequency range of 20 kHz to 1 MHz, much smaller than that of the latter sample. For the former, temperature dependence of dielectric co.stant is much flatter and there exists an extended phase transition diffusion co.ering a wide temperature range of Curie temperature To. The smaller grain size of the former depresses the dc bias electrical field dependence of dielectric co.stant. The tunability is 7% under a bias field of 0.6 kV/mm dc.

关键词： Hydrothermal method SrTiO3 BaTiO3 Dielectric properties

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Effects of co.ling rate on vermicular graphite percentage in a brake drum produced by onestep co.ed wire injection

引用

China Foundry 2015年第5期12卷 349-353页

作者： Yu-shuang Feng Ze-sheng Ji He-sheng Wu Yong-cheng Feng School of Materials Science and Engineering Harbin University of Science and Technology Harbin Kedewei Metallurgy co. Ltd. shandong Ductile Iron Pipes co. Ltd.

In this research, a vermicular graphite cast iron brake drum was produced by co.ed wire injection in a one-step method. Silica sand and low-density alumina-silicate ceramic were used as molding materials in order to investigate the effect of co.ling rate on percentage of vermicular graphite and mechanical properties of the brake drum casting. Several thermoco.ples were inserted into the casting in the desired positions to measure the temperature change. By means of one-step co.ed wire injection, the two residual co.centrations of Mg and RE were effectively co.trolled in the ranges of 0.013%-0.017% and 0.019%-0.025%, respectively, which are crucial for the production of vermicular graphite cast iron and the formation of vermicular graphite. In addition, the co.ling rate had a significant effect on the vermicular graphite percentage. In the case of the silica mold brake drum casting, there was an obvious difference in the co.ling rate with the wall change, leading to a change in vermicular graphite percentage from 70.8% to 90%. In the low-density alumina-silicate ceramic mold casting, no obvious change in temperature was detected by the thermoco.ples and the percentage of the vermicular graphite was stable at 85%. Therefore, the vermicular graphite cast iron brake drum with a better co.bination of mechanical properties co.ld be obtained.

关键词： co.ed wire injection in one-step vermicular graphite cast iron co.ling rate vermicular graphite percentage brake drum

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：