TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
·
2023
·
IF 4.5
Zhao-wang DONG,Xue-yi GUO,Yang XIA,Pei-dong LIU,Jin-xi QIAO,Zhong-chen LI,Han-ning LIU
Silicon in two types of upgraded titania slag (UGS) containing different components was removed using a low-temperature alkali solution and melt leaching. The effects of temperature, time, and NaOH solution concentration on desilication rate were investigated. Desilication in melt can lead to the loss of titanium in upgraded titania slag. After agitating at a speed of 600 r/min and 80 °C for 300 min, the silicon content in domestic slag decreased from 0.96 wt.% to 0.29 wt.%, and the leaching rate was 69.8% after leaching in 4 mol/L sodium hydroxide solution. Under the same conditions, the silicon content in imported slag decreased from 1.11 wt.% to 0.12 wt.%, and the desilication rate was up to 89.2%. The alloy powders obtained from the reduction of upgraded titania slag with magnesium were sintered to produce titanium alloy, and the alloy was characterized. It was determined that the Ti 5 Si 3 phase in the titanium alloy product was successfully eliminated. In addition, the two UGS materials and the chemical principle of desiliconization were analyzed using a thermodynamic software.
研究领域:
材料科学
·
冶金工程
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产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Chongyang Tao,Lanyun Li,Ni He,Guodong Sun,Chengze Liu,Junjie Xu,Mingyang Li,Longlong Dong,Yusheng Zhang,Lianwen Wang,Mingjia Li
In this study, low energy ball milling and spark plasma sintering techniques prepared the in-situ synthesized Ti 5 Si 3 reinforced Ti-6Al-4V (TC4) matrix composites and then rolled them at high temperatures. In the composites with high Si content, the Ti 5 Si 3 particles distributed at the interface of α-phase and β-phase agglomerated and then formed a quasi-continuous network structure, which will deteriorate the plasticity of the composites. After hot rolling, the grains of the composite were significantly refined, and more Ti 5 Si 3 particles were precipitated. With the increase in Si content, the tensile strength of sintered composites increased slightly, but the elongation decreased greatly. After hot rolling, the tensile strength of the composite increased significantly with an increment of 359.4 MPa, among which the composite with 0.6 wt% Si achieved a synchronous increase in strength and plasticity. The strengthening mechanism of sintered composites included dislocation strengthening, solution strengthening, and grain refinement, among which dislocation strengthening and grain refinement were the main strengthening mechanisms. The strengthening mechanism of rolled composites was mainly the dislocation strengthening caused by rolling, the grain refinement, and the mismatch of thermal expansion coefficient.
研究领域:
材料科学
·
机械工程
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产品关联
DOI
高影响因子
JOM
·
2017
·Vol. 70
·期 2
·138-143
·
IF 1.86
Zheng Kai,Zou Xingli,Xie Xueliang,Lu Changyuan,Chen Chaoyi,Xu Qian,Lu Xionggang
This paper investigated the electrolytic production of Ti 5 Si 3 /TiC composites from TiO 2 /SiO 2 /C in molten CaCl 2 . The solid-oxide oxygen-ion-conducting membrane tube filled with carbon-saturated liquid tin was served as the anode, and the pressed spherical TiO 2 /SiO 2 /C pellet was used as the cathode. The electrochemical reduction process was carried out at 1273 K and 3.8 V. The characteristics of the obtained cathode products and the reaction mechanism of the electroreduction process were studied by a series of time-dependent electroreduction experiments. It was found that the electroreduction process generally proceeds through the following steps: TiO 2 /SiO 2 /C → Ti 2 O 3 , CaTiO 3 , Ca 2 SiO 4 , SiC → Ti 5 Si 3 , TiC. The morphology observation and the elemental distribution analysis indicate that the reaction routes for Ti 5 Si 3 and TiC products are independent during the electroreduction process.
研究领域:
材料科学
·
电化学
·
陶瓷与复合材料
·
冶金学
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DOI
高影响因子
ISIJ INTERNATIONAL
·
2024
·
IF 1.6
Zhongya Pang,Shun Chen,Zhenqiang Jiang,Chenyang Han,Xing Yu,Kai Zheng,Chaoyi Chen,Guangshi Li,Qian Xu,Xingli Zou,Xionggang Lu
Titanium-bearing blast furnace slag (TBFS), a byproduct of ironmaking processes, has long been discarded as waste, resulting in the squandering of valuable resources such as titanium. The recovery and effective utilization of TBFS hold immense significance and importance. This study reports a direct electrolysis method for synthesizing Ti5Si3 alloy from a TBFS/SiO2 mixture in molten CaCl2 at 950 °C. A comprehensive investigation was conducted into the phase and morphological evolution during the electrolysis process, along with an analysis of the migration behavior of impurities such as Ca and Al present in TBFS. The synthesized Ti5Si3 alloy powder was systematically characterized and analyzed using scanning electron microscopy, transmission electron microscopy, and other techniques. The results reveal that the electrolysis process encompasses electrochemical deoxidation, in-situ alloying, and self-purification. Furthermore, this study achieved further purification of the Ti5Si3 alloy through vacuum laser rapid melting, effectively volatilizing and removing the residual impurity elements, resulting in an increase in the purity of Ti5Si3 alloy from 96.8% to 98.6%. The resultant Ti5Si3 alloy exhibits excellent corrosion resistance in phosphate buffer solution. In summary, this work provides a crucial technical paradigm and scientific theoretical foundation for the resourceful and value-added utilization of ironmaking solid waste, specifically TBFS.
研究领域:
冶金学
·
材料科学
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产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2026
·
IF 6
Shunkai Wang,Xiaolei Song,Ziteng Su,Ziheng Jia,Zhifeng Zhang,Zhenxin Duan,Rui Zhang,Huiliang Shao,Jingjing Zhang
TiAl alloys are highly promising for aerospace applications due to their low density and high specific strength. However, their insufficient high-temperature oxidation resistance poses a significant limitation to widespread practical use. To address this, a TiAl substrate was embedded in an Al 2 O 3 -SiO 2 powder mixture and subjected to a diffusion-based pack cementation process at 1000 °C for 5 h under vacuum. This process produced a sandwich-structured Al 2 O 3 /Ti 5 Si 3 composite coating, with continuous Ti 5 Si 3 inner/outer layers separated by a middle Al 2 O 3 layer. During cyclic oxidation at 900 °C for 100 h, the coated alloy showed a significantly lower weight gain (2.38 mg/cm 2 ) than the uncoated alloy (10.76 mg/cm 2 ), representing a ∼77 % reduction. The enhanced protection stems from the ability of the Ti 5 Si 3 and Al 2 O 3 layers to act as a dual barrier, effectively blocking inward oxygen diffusion and outward migration of Ti/Al cations. In addition, the Al 2 O 3 formed by oxidation of the substrate itself further suppresses the inward diffusion of oxygen, thereby substantially improving the high-temperature oxidation resistance of the TiAl alloy.
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）