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carlxiong金虫 (小有名气)
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[交流]
论文求助，有金币！
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谢谢兄弟姐妹！！！ [ Last edited by carlxiong on 2010-1-5 at 19:26 ] |
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yu_changwu
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6楼2010-01-10 20:46:23
wumin1283
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carlxiong(金币+1,VIP+0): 1-4 16:18
carlxiong(金币+1,VIP+0): 1-4 16:19
carlxiong(金币+1): 2010-03-18 12:54
carlxiong(金币+1,VIP+0): 1-4 16:18
carlxiong(金币+1,VIP+0): 1-4 16:19
carlxiong(金币+1): 2010-03-18 12:54
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1、FN ISI Export Format VR 1.0 PT J AU Xiong, BW Long, WY Chen, Z Xia, C Wan, H Yan, YW AF Xiong, BoWen Long, WenYuan Chen, Zhe Xia, Chun Wan, Hong Yan, YouWei TI Effects of element proportions on microstructures of Nb/Nb5Si3 in situ composites by spark plasma sintering SO JOURNAL OF ALLOYS AND COMPOUNDS LA English DT Article DE High-temperature alloys; Spark plasma sintering; Microstructure; Niobium silicide ID TEMPERATURE; STRENGTH; BEHAVIOR AB Nb/Nb5Si3 composites were successfully fabricated by a spark plasma sintering (SPS) technology. The effects of element (Nb and Si) proportions on the microstructures of the synthesized composites were mainly investigated. The results show that element proportions strongly affect the microstructures of Nb/Nb5Si3 composites; Nb/Nb5Si3 in situ composites up to 99.59% of theoretical density were fabricated by SPS technology, and the microstructures of the fabricated composites comprise the synthesized Nb5Si3 and the uniformly distributed Nb particles. Moreover, with the increase in the Si content from 6% to 20% (atom fraction), the volume fraction of the synthesized Nb5Si3 in the composites increases, whereas the content and size of Nb particles decrease obviously. The higher shrinkage and densification for Si content (16 at.% and 20 at.%) close to the eutecticcomposition take place. When sintering temperature over 1400 degrees C, the shrinkage obviously retards and finally stops. (c) 2008 Elsevier B.V. All rights reserved. C1 [Xiong, BoWen; Long, WenYuan; Xia, Chun; Wan, Hong] Nanchang Hangkong Univ, Coll Mat Sci & Engn, Nanchang 330063, Peoples R China. [Chen, Zhe] Nanchang Inst Technol, Nanchang 330013, Peoples R China. [Yan, YouWei] Huazhong Univ Sci & Technol, State Key Lab Die Technol, Wuhan 430074, Peoples R China. RP Xiong, BW, Nanchang Hangkong Univ, Coll Mat Sci & Engn, Nanchang 330063, Peoples R China. EM bowenxiong@163.com FU National Natural Science Foundation of China 50276023 [50276023]; Nanchang Hangkong University Foundation of China [EC200701021]; Jiangxi Provincial department of Science and Technology Foundation of China [DB200701049] FX This research was financially supported by the National Natural Science Foundation of China ( Grant Number: 50276023), Nanchang Hangkong University Foundation of China ( Grant Number: EC200701021), and Jiangxi Provincial department of Science and Technology Foundation of China ( Grant Number: DB200701049). NR 12 TC 1 PU ELSEVIER SCIENCE SA PI LAUSANNE PA PO BOX 564, 1001 LAUSANNE, SWITZERLAND SN 0925-8388 J9 J ALLOYS COMPOUNDS JI J. Alloy. Compd. PD MAR 5 PY 2009 VL 471 IS 1-2 BP 404 EP 407 DI 10.1016/j.jallcom.2008.03.095 PG 4 SC Chemistry, Physical; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering GA 431TG （检索号） UT ISI:000265086300090 （收录号） |
2楼2010-01-04 16:10:10
wumin1283
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carlxiong(金币+1,VIP+0):谢谢 1-4 16:18
carlxiong(金币+1): 2010-03-18 12:54
carlxiong(金币+1,VIP+0):谢谢 1-4 16:18
carlxiong(金币+1): 2010-03-18 12:54
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2、FN ISI Export Format VR 1.0 PT J AU Xiong, BW Cai, CC Wan, H Zheng, YH AF Xiong, Bowen Cai, Changchun Wan, Hong Zheng, Yuhui TI Effects of Si, W and W-Mo on isothermal oxidation behaviors of Nb/Nb5Si3 in situ composites at high temperature SO JOURNAL OF ALLOYS AND COMPOUNDS LA English DT Article DE Oxidation behavior; Microstructure; In situ composites; Niobium silicide; High-temperature material ID MICROSTRUCTURE; ALLOYS; MOLYBDENUM; RESISTANCE; ADDITIONS; HF AB The effects of Si, W and W-Mo on the isothermal oxidation behaviors of Nb/Nb5Si3 in situ composites in static air at 1000 and 1200 degrees C for 20-100 h were investigated on as-cast materials. The results show that the oxidation kinetics of each alloy was not changed whether at 1000 or 1200 degrees C, and the oxidation mechanism were not changed. The oxidation resistance of Nb/Nb5Si3 in situ composites was sensitive to Si content, and the oxidation rate of Nb-10Si alloy was more than twice as many that of Nb-20Si alloy. By alloying of W, the oxidation resistance of Nb-20Si-10W alloy was improved significantly, because the WO3 scale can provide the adherence for the creaked Nb2O5 scale and reduce the diffusion of oxygen through the scale. Comparing to alloying with W, the poor oxidation resistance of Nb-20Si-10W-10Mo alloy was attributed to the evaporation of MoO3 and highly porous scale. Crown Copyright (C) 2009 Published by Elsevier B.V. All rights reserved. C1 [Xiong, Bowen; Cai, Changchun; Zheng, Yuhui] Nanchang Hangkong Univ, Natl Def Key Discipline Lab Light Alloy Proc Sci, Nanchang 330063, Peoples R China. [Xiong, Bowen; Wan, Hong] Nanchang Hangkong Univ, Sch Mat Sci & Engn, Nanchang 330063, Peoples R China. RP Xiong, BW, Nanchang Hangkong Univ, Natl Def Key Discipline Lab Light Alloy Proc Sci, Nanchang 330063, Peoples R China. EM bowenxiong@163.com FU Nanchang Hangkong University Foundation of China [EC200701021]; Jiangxi Provincial department of Science and Technology Foundation of China [DB200701049] FX This research was financially supported by the Nanchang Hangkong University Foundation of China under Grant No.: EC200701021, and Jiangxi Provincial department of Science and Technology Foundation of China under Grant No.: DB200701049. NR 22 TC 0 PU ELSEVIER SCIENCE SA PI LAUSANNE PA PO BOX 564, 1001 LAUSANNE, SWITZERLAND SN 0925-8388 J9 J ALLOYS COMPOUNDS JI J. Alloy. Compd. PD NOV 3 PY 2009 VL 486 IS 1-2 BP 330 EP 334 DI 10.1016/j.jallcom.2009.06.136 PG 5 SC Chemistry, Physical; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering GA 520TU （检索号） UT ISI:000271872400073 （收录号） |
3楼2010-01-04 16:12:29
wumin1283
银虫 (著名写手)
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carlxiong(金币+1,VIP+0):谢谢 1-4 16:19
carlxiong(金币+1): 2010-03-18 12:54
carlxiong(金币+1,VIP+0):谢谢 1-4 16:19
carlxiong(金币+1): 2010-03-18 12:54
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3、FN ISI Export Format VR 1.0 PT J AU Xiong, BW Long, WY Chen, Z Wan, H Yan, YW AF Xiong Bowen Long Wenyuan Chen Zhe Wan Hong Yan Youwei TI Effects of W and W-Mo Additions on Microstructures of Nb/Nb5Si3 in Situ Composites by Spark Plasma Sintering SO RARE METAL MATERIALS AND ENGINEERING LA Chinese DT Article DE spark plasma sintering; in-situ synthesis; microstructure; Nb/Nb5Si3 composites ID FRACTURE; TEMPERATURE; TI AB Nb-20Si, Nb-20Si-10W and Nb-20Si-10W-10Mo samples were prepared by a spark plasma sintering (SPS), the effects of W and W-Mo additions on the microstructure of Nb/Nb5Si3 composites were mainly investigated. The microstructures were examined by scanning electron microscope (SEM). X-ray diffraction (XRD) was used for phase identification of the samples. The compositions were analyzed by electron-probe micro-analysis (EPMA). Results indicate that Nb/Nb5Si3 (c)omposites up to 99.59% of theoretical density are fabricated. W can be perfect solid-solutioned in Nb/Nb5Si3 Composites, and the microstructure of Nb/Nb5Si3 composites is not changed, but the microstructure of Nb/Nb5Si3 composites is obviously changed after addition of W-Mo, Nb monophase, the solid solution of W and Mo in Nb, and the solid solution of partial Nb in W appear, but the solid solution phenomena of Nb5Si3 is not detected. C1 [Xiong Bowen] Nanchang Hangkong Univ, Coll Mat Sci & Engn, Nanchang 330063, Peoples R China. [Chen Zhe] Nanchang Inst Technol, Nanchang 330099, Peoples R China. [Yan Youwei] Huazhong Univ Sci & Technol, Sate Lab Die Technol, Wuhan 430074, Peoples R China. RP Xiong, BW, Nanchang Hangkong Univ, Coll Mat Sci & Engn, Nanchang 330063, Peoples R China. EM bowenxiong@163.com NR 15 TC 0 PU NORTHWEST INST NONFERROUS METAL RESEARCH PI SHAANXI PA C/O RARE METAL MATERIAL ENGINEERING PRESS, PO BOX 51, XIAN, SHAANXI 710016, PEOPLES R CHINA SN 1002-185X J9 RARE METAL MAT ENG JI Rare Metal Mat. Eng. PD JUN PY 2009 VL 38 IS 6 BP 1112 EP 1115 PG 4 SC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering GA 468XE （检索号） UT ISI:000267856900039 （收录号） |
4楼2010-01-04 16:14:57
