Journal of University of Science and Technology Beijing, Mineral, Metallurgy, Material最新文献_第2页

Effects of heat treatment on the microstructure and mechanical properties of ZA84 magnesium alloy 热处理对ZA84镁合金组织和力学性能的影响

Journal of University of Science and Technology Beijing, Mineral, Metallurgy, Material Pub Date : 2008-12-01 DOI: 10.1016/S1005-8850(08)60281-9

Mingbo Yang , Liang Bai , Fusheng Pan , Hongjun Hu

引用次数: 3

Particle erosion of infrared materials 粒子对红外材料的侵蚀

Journal of University of Science and Technology Beijing, Mineral, Metallurgy, Material Pub Date : 2008-12-01 DOI: 10.1016/S1005-8850(08)60283-2

Qi Hi, Fanxiu Lv, Fenglei Zhang, Huibin Guo, Junjun Wei

{"title":"Particle erosion of infrared materials","authors":"Qi Hi, Fanxiu Lv, Fenglei Zhang, Huibin Guo, Junjun Wei","doi":"10.1016/S1005-8850(08)60283-2","DOIUrl":"10.1016/S1005-8850(08)60283-2","url":null,"abstract":"<div>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 damaged 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.</div>","PeriodicalId":100851,"journal":{"name":"Journal of University of Science and Technology Beijing, Mineral, Metallurgy, Material","volume":"15 6","pages":"Pages 758-763"},"PeriodicalIF":0.0,"publicationDate":"2008-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1005-8850(08)60283-2","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73299494","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Pseudo-capacitance of ruthenium oxide/carbon black composites for electrochemical capacitors 电化学电容器用氧化钌/炭黑复合材料的赝电容

Journal of University of Science and Technology Beijing, Mineral, Metallurgy, Material Pub Date : 2008-12-01 DOI: 10.1016/S1005-8850(08)60293-5

Xiaofeng Wang , Dianbo Ruan , Peng Wang , Yiqiang Lu

{"title":"Pseudo-capacitance of ruthenium oxide/carbon black composites for electrochemical capacitors","authors":"Xiaofeng Wang , Dianbo Ruan , Peng Wang , Yiqiang Lu","doi":"10.1016/S1005-8850(08)60293-5","DOIUrl":"10.1016/S1005-8850(08)60293-5","url":null,"abstract":"<div>Hydrous ruthenium oxide was formed by a new process. The precursor was obtained by mixing the aqueous solutions of RuCl3·xH2O and NaHCO3. The addition of NaHCO3 led to the formation of an oxide with extremely fine RuO2 particles forming a porous network structure in the oxide electrode. Polyethylene glycol was added as a controller to partly inhibit the sol-gel reaction. The rate capacitance of 530 F·g−1 was measured for the powder formed at an optimal annealing temperature of 210°C. Several details concerning this new material, including crystal structure, particle size as a function of temperature, and electrochemical properties, were also reported. In addition, the rate capacitance of the composite electrode reached 800 F·g−1 after carbon black was added. By using the modified electrode of a RuO2/carbon black composite electrode, the electrochemical capacitor exhibits high energy density and stable power characteristics. The values of specific energy and maximum specific power of 24 Wh·kg−1 and 4 kW·kg−1, respectively, are demonstrated for a cell voltage between 0 and 1 V.</div>","PeriodicalId":100851,"journal":{"name":"Journal of University of Science and Technology Beijing, Mineral, Metallurgy, Material","volume":"15 6","pages":"Pages 816-821"},"PeriodicalIF":0.0,"publicationDate":"2008-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1005-8850(08)60293-5","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76172473","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 5

Vaporization behavior of lead from the FeO-CaO-SiO2-Al2O3 slag system FeO-CaO-SiO2-Al2O3渣体系中铅的汽化行为

Journal of University of Science and Technology Beijing, Mineral, Metallurgy, Material Pub Date : 2008-12-01 DOI: 10.1016/S1005-8850(08)60269-8

Yanling Zhang , Rui Zhang , Eiki Kasai , Shiqi Li

{"title":"Vaporization behavior of lead from the FeO-CaO-SiO2-Al2O3 slag system","authors":"Yanling Zhang , Rui Zhang , Eiki Kasai , Shiqi Li","doi":"10.1016/S1005-8850(08)60269-8","DOIUrl":"10.1016/S1005-8850(08)60269-8","url":null,"abstract":"<div>Vaporization behavior (1163–1463 K) of lead in the slag system of FeO-CaO-SiO2-Al2O3 with CaCl2 was examined. A thermodynamic estimation with the principle of Gibbs free energy minimization showed that the major vapor species from the sample of the FeO-CaO-SiO2-Al2O3 system+PbO+CaCl2 were metallic Pb, PbCl, PbCl2, and FeCl2, at the experimental temperature range. The experimental results show that the mole ratio of vaporized Cl in lead chlorides to vaporized Pb, simply expressed as Cl/Pb, decreases with increasing temperature. The larger Cl/Pb means a larger ratio of gaseous PbCl2, since metallic Pb and PbCl vapors are formed in a similar reduction atmosphere. The evaporation is initially rapid and becomes steady after holding for 10 min. Gaseous PbCl2 is mainly formed during the heating period, and at the holding stage, it reacts with FeO to produce gaseous FeCl2. With regard to slag composition, FeO content and basicity significantly affect the evaporation of lead. High FeO content and high basicity promotes the formation of metallic Pb and PbCl, whereas, it prohibits PbCl2 evaporation.</div>","PeriodicalId":100851,"journal":{"name":"Journal of University of Science and Technology Beijing, Mineral, Metallurgy, Material","volume":"15 6","pages":"Pages 671-677"},"PeriodicalIF":0.0,"publicationDate":"2008-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1005-8850(08)60269-8","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81448554","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 4

Microstructure and wear properties of the electroslag remelting layer reinforced by TiC particles TiC颗粒增强电渣重熔层的组织与磨损性能

Journal of University of Science and Technology Beijing, Mineral, Metallurgy, Material Pub Date : 2008-12-01 DOI: 10.1016/S1005-8850(08)60285-6

Qianlin Wu, Yangshan Sun, Guoqing Li

引用次数: 6

HSM strategy study for hardened die and mold steels manufacturing based on the mechanical and thermal load reduction strategy 基于机械和热负荷降低策略的硬模具钢加工的高速切削策略研究

Journal of University of Science and Technology Beijing, Mineral, Metallurgy, Material Pub Date : 2008-12-01 DOI: 10.1016/S1005-8850(08)60277-7

Ying Tang , Hongsheng Guo

引用次数: 2

Monitor automatic gauge control strategy with a Smith predictor for steel strip rolling 用Smith预测器监测带钢轧制自动厚度控制策略

Journal of University of Science and Technology Beijing, Mineral, Metallurgy, Material Pub Date : 2008-12-01 DOI: 10.1016/S1005-8850(08)60295-9

Dianhua Zhang , Hao Zhang , Tao Sun , Xu Li

引用次数: 11

Effect of alkali-activation on aluminosilicate-based cementitious materials 碱活化对硅酸盐铝基胶凝材料的影响

Journal of University of Science and Technology Beijing, Mineral, Metallurgy, Material Pub Date : 2008-12-01 DOI: 10.1016/S1005-8850(08)60290-X

Xiaoguang Yang , Wen Ni , Xufang Zhang , Yali Wang

{"title":"Effect of alkali-activation on aluminosilicate-based cementitious materials","authors":"Xiaoguang Yang , Wen Ni , Xufang Zhang , Yali Wang","doi":"10.1016/S1005-8850(08)60290-X","DOIUrl":"10.1016/S1005-8850(08)60290-X","url":null,"abstract":"<div>High-performance aluminosilicate-based cementitious materials were produced with fly ash from a coal power plant as one of the major raw materials. The structures of fly ash containing aluminosilicate-based cementitious materials were compared before and after treatment by the methods of nuclear magnetic resonance (NMR) and scanning electron microscopy (SEM). During the 28 d curing time, the compressive strength of water glass and fly ash samples increased from 9.08 MPa to 26.75 MPa. The results show that most of the stiff shells are destroyed after mechanical grinding and chemical activation. Magic angle spinning (MAS) NMR of 27Al shows that the wide peak becomes narrow and the main peak shifts to the direction of low field, indicating the decrease of polymerization degree, the enhancing of activity, the decrease of six-coordination structure, and the increase of small and symmetrical four-coordination polyhedron structure within the aluminum-oxygen polyhedron network. Comparisons between MAS NMR of 29Si with different treatments suggest that Q0 disappears, the quantity of Q2 increases, and the quantity of Q4 decreases. The polymerization degree of silicon-oxygen is reduced, and the potential activity of fly ash is increased.</div>","PeriodicalId":100851,"journal":{"name":"Journal of University of Science and Technology Beijing, Mineral, Metallurgy, Material","volume":"15 6","pages":"Pages 796-801"},"PeriodicalIF":0.0,"publicationDate":"2008-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1005-8850(08)60290-X","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83150118","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 8

Influence and determinative factors of ion-to-atom arrival ratio in unbalanced magnetron sputtering systems 非平衡磁控溅射系统中离子原子到达比的影响及决定因素

Journal of University of Science and Technology Beijing, Mineral, Metallurgy, Material Pub Date : 2008-12-01 DOI: 10.1016/S1005-8850(08)60286-8

Jun Zhou, Zhe Wu, Zhanhe Liu

{"title":"Influence and determinative factors of ion-to-atom arrival ratio in unbalanced magnetron sputtering systems","authors":"Jun Zhou, Zhe Wu, Zhanhe Liu","doi":"10.1016/S1005-8850(08)60286-8","DOIUrl":"10.1016/S1005-8850(08)60286-8","url":null,"abstract":"<div>Low pressure sputtering with a controlled ratio of ion flux to deposited atom flux at the condensing surface is one of the main directions of development of magnetron sputtering methods. Unbalanced magnetron sputtering, by producing dense secondary plasma around the substrate, provides a high ion current density. The closed-field unbalanced magnetron sputtering system (CFUBMS) has been established as a versatile technique for high-rate deposition high-quality metal, alloy, and ceramic thin films. The key factor in the CFUBMS system is the ability to transport high ion currents to the substrate, which can enhance the formation of full dense coatings at relatively low value homologous temperature. The investigation shows that the energy of ions incidenced at the substrate and the ratio of the flux of these ions to the flux of condensing atoms are the fundamental parameters in determining the structure and properties of films produced by ion-assisted deposition processes. Increasing ion bombardment during deposition combined with increasing mobility of the condensing atoms favors the formation of a dense microstructure and a smooth surface.</div>","PeriodicalId":100851,"journal":{"name":"Journal of University of Science and Technology Beijing, Mineral, Metallurgy, Material","volume":"15 6","pages":"Pages 775-781"},"PeriodicalIF":0.0,"publicationDate":"2008-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1005-8850(08)60286-8","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84528885","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 7

Mechanism of protective film formation during CO2 corrosion of X65 pipeline steel X65管线钢CO2腐蚀过程中保护膜形成机理

Journal of University of Science and Technology Beijing, Mineral, Metallurgy, Material Pub Date : 2008-12-01 DOI: 10.1016/S1005-8850(08)60274-1

Tong Li , Yongjin Yang , Kewei Gao , Minxu Lu

引用次数: 37