T.Wang 1)
,
T.H.Luo 1)
,
X.N.Zeng 1)
,
Q.Sha 1)
,
Z.H.Xiao 1) and C.S.Xu 2) 1) Wuhan University of Science & Technology
,
Wuhan 430081
,
China 2) Chongqing University
,
Chongqing 400044
,
China M
金属学报(英文版)
When smelting reduction of chromium and nickel concentrate with C Si Al as compound reductive is conducted in a plasma induction furnace, the alloying target value of 18%Cr and 9%Ni could be achieved in 20 minutes, the recovery rate of Cr and Ni would reach 82 85% and 95 98% respectively. Content of C could be limited within 0.3%. This paper also analysis the properties of electrochemical reaction between slag and molten metal.
关键词:
plasma
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null
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null
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null
Chinese Physics Letters
The magnetic properties of 1 T-TaS2 and 1 T-Fe-0.07 Ta-0.93 S-2 have been studied, Experimental results show that the phase transition temperature of 1 T-TaS2 is a function of the magnetic field, At low temperatures, both compounds are in a mixed state of charge density wave -spin density wave due to the coherent superposition of antiferromagnetic coupling.
关键词:
density
Physical Review B
The magnetic properties and phase transitions of 1T-TaS2 and 1T-Fe0.07Ta0.93S2 have been studied in the interval of 1.5-300 K and over the range of 100 Oe-60 kOe. Experimental results show that at high temperatures the compounds are in a diamagnetic state and the commensurate-charge-density-wave-triclinic-nearly-commensurate transition temperature of 1T-TaS2 decreases with increasing magnetic field. The amount of variation is a function of the magnetic field. At low temperatures both 1T-TaS2 and 1T-Fe0.07Ta0.93S2 are in a paramagnetic state owing to the localized moments that come from the single Anderson-Mott localization state. The curves of magnetization versus temperature do not follow the Curie law or Curie-Weiss law, but can be described fairly well as M = M(0) + gamma T--n. The fitting parameters of experimental curves show that a part of the neighboring moment appears as antiferromagnetic coupling due to exchange interaction between the moments. The magnetic-field dependence of magnetization exhibits a complicated feature at low temperature. It shows that the compounds may undergo a phase transition at the maximum value of magnetization and then they are probably in a mixed charge-density-wave-spin-density-wave (CDW-SDW) state or SDW state due to the coherent superposition of the antiferromagnetic coupling.
关键词:
metal-insulator-transition;density-wave domains;high magnetic-fields;charge-density;doped 1t-tas2;coexistence;microscopy;systems;silicon;2h-tas2
Huijie LIU
材料科学技术（英文）
The friction stir weldabilities of the strain-hardened AA1050-H24 and precipitate-hardened AA6061-T6 aluminum alloys were examined to reveal the effects of material properties on the friction stir welding behavior. The experimental results are obtlained. (1) For AA1050-H24, the weld can possess smoother surface ripples; there is no elliptical weld nugget in the weld; there is no discernible interface between the stir zone and the thermomechanically affected zone; and the internal defect of the weld looks like a long crack and is located in the lower part of the weld. (2) For AA6061-T6, the weld usually possesses slightly rougher surface ripples; an elliptical weld nugget clearly exists in the weld; there are discernible interfaces among the weld nugget, thermomechanically affected zone and heat affected zone; and the internal defect of the weld is similar to that of the AA1050-H24 weld. (3) The effective range of welding parameters for AA1050-H24 is narrow, while the one for AA6061-T6 is very wide. (4) The maximum tensile strength efficiency of the AA1050-H24 joints is similar to that of the AA6061-T6 joints, i.e. 79% and 77%, respectively.
关键词:
Friction stir weldability
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null
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null
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null
井敏
,
谭婷婷
,
王成国
,
冯志海
,
杨云华
,
潘月秀
材料科学与工艺
doi:10.11951/j.issn.1005-0299.20150208
东丽T800H和T800S是分别采用湿纺和干湿纺制备的两种力学性能相近的碳纤维，为弄清不同纺丝方法对T800级碳纤维微观结构的影响，采用扫描电镜、X射线衍射仪、小角X射线散射仪和高分辨透射电镜对这两种碳纤维进行测试，比较其表面形貌、断口形状和形貌、石墨微晶结构和微孔结构等．研究结果表明，湿纺制备的T800H比干喷湿纺制备的T800S的表面粗糙、断口圆度差、原纤尺寸较大、石墨微晶致密度差且发育不完善、内部微孔尺寸大、石墨微晶条带韧性差，这正是T800H的拉伸强度和断裂伸长率不如T800S的重要微观结构因素，但T800H的石墨微晶取向度不如T800S，孔隙率略高于T800S．
关键词:
碳纤维
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微观结构
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力学性能
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表面形貌
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孔结构
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石墨微晶
王迎芬
,
彭公秋
,
李国丽
,
谢富原
,
刘勇
材料科学与工艺
doi:10.11951/j.issn.1005-0299.20150420
为了研究T800H碳纤维的表面特性及其与BA9918树脂的界面匹配性，分别采用SEM、AFM、XPS和TGA对T800H碳纤维表面形貌、表面化学特性以及碳纤维上浆剂热稳定性进行表征，测试了T800H／BA9918复合材料湿热处理前后0°压缩强度、90°拉伸强度和层间剪切强度，并得到了其在湿热处理前后的开孔压缩和冲击后压缩性能。测试发现T800H碳纤维表面有明显的沟槽，有利于表面机械啮合作用；T800H／BA9918复合材料经29 J能量冲击后压缩强度为314 MPa；在130℃湿态环境下其0°压缩强度和层间剪切强度保持率高于58％，开孔压缩强度保持率高于60％。试验结果证明T800H碳纤维与BA9918树脂具有良好的界面匹配性，T800H／BA9918复合材料具有优异的耐湿热性能。
关键词:
T800H碳纤维
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复合材料
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力学性能
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湿热处理
Communications in Theoretical Physics
For the first time, by taking into account all the irreducible representations and their components in the electron-phonon interaction (EPI) as well as all the levels and the admixtures of wavefunctions within d(3) electronic configuration, the values of parameters in expressions of Raman and optical-branch terms of thermal shifts (TS) due to EPI for three levels, T-4(2) band and T-4(1) band of ruby have been evaluated; the contributions to TS of T-4(2) and T-4(1) broad bands from thermal expansion have also been. calculated; and then, the TS of the peak energies of 'T2 and 4 Ti broad bands have been calculated. The results are in satisfactory agreement with observed data. The values of single-electron reduced matrix elements representing the strengths of EPI of T-4(2) and T-4(1) bands have respectively been determined. For TS of the peak energies of T-4(2) and T-4(1) bands, it is found that the contribution to TS from the second-order term in EPI Hamiltonian is dominant; TS due to EPI of acoustic branches are over two times as much as those of optical branches, and both of them increase rapidly with temperature; the neighbor-level term is insignificant; the contribution to TS from thermal expansion is specially important, and all the three terms of TS of T-4(2) or T-4(1) band axe red shifts.
关键词:
crystal fields;optical spectral bands;electron-phonon interaction;thermal expansion;thermal shift;theoretical calculations;high-pressure;field;spectroscopy;spectra
李新梅
,
张忠文
,
邹勇
,
杜宝帅
,
邹增大
材料导报
根据新型耐热钢T92和Super304H钢的焊接特点制定了适宜的焊接工艺,研究了焊制的T92/Super304H异种钢焊接接头的力学性能.结果表明,T92/Super304H异种钢接头的各项力学性均能满足使用要求.焊缝金属的韧性远低于T92钢侧热影响区,焊缝金属的结晶形态对焊缝韧性有很大的影响.焊接接头中焊缝金属的硬度值最高,而T92钢侧热影响区硬度最低,并且不同热影响区部位显微硬度变化较大,Super304H钢侧热影响区硬度变化不大.
关键词:
T92钢
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Super304H钢
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新型耐热钢
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异种钢
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焊接接头
苏艳蓉
,
柴立元
,
杨志辉
,
尤翔宇
,
朱咏华
中国有色金属学报
以pannonibacter phragmitetusT1菌作为生物吸附剂,研究细菌代谢活性、培养时间、溶液pH值、菌体用量、温度、吸附时间、初始金属浓度等因素对其吸附重金属pb2+的影响,并进一步研究吸附机理.结果表明,培养12h的灭活T1菌体在pb2+浓度为150 mg/L、pH值为6、T1菌添加量为0.5 g/L、温度为30℃的条件下,对Pb2+的最大吸附量为68.35 mg/g;灭活T1菌对重金属Pb2+的吸附过程较快,90 min即达到吸附平衡,pb2+的吸附符合Pseudo-second order模型和Langmuir等温吸附模型.结合红外光谱分析,灭活pannonibacter phragmitetus T1 菌对Pb2+是表面吸附,羟基和酰胺基是与Pb2+络合反应的主要基团.
关键词:
pannonibacter phragmitetus T1菌
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铅离子
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吸附条件
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吸附机理
