scholarly journals Effects of rare-earth oxides on the microstructure and properties of Fe-based friction materials synthesized by in situ carbothermic reaction from vanadium-bearing titanomagnetite concentrates

RSC Advances ◽  
2019 ◽  
Vol 9 (36) ◽  
pp. 20687-20697
Author(s):  
Dajun Zhai ◽  
Yue Shui ◽  
Keqin Feng ◽  
Yanyan Zhang
Keyword(s):  
Rare Earth ◽  
Tribological Properties ◽  
Rare Earth Oxides ◽  
Frictional Material ◽  
Friction Materials ◽  
Microstructure And Properties ◽  
Iron Based

In this work, we prepared an iron-based frictional material from vanadium-bearing titanomagnetite concentrates by in situ carbothermic reaction with improved tribological properties.

scholarly journals Influence of Mn on the iron-based friction material directly prepared by in situ carbothermic reaction from vanadium-bearing titanomagnetite concentrates

RSC Advances ◽  
2018 ◽  
Vol 8 (64) ◽  
pp. 36503-36511 ◽  
Author(s):  
Yue Shui ◽  
Keqin Feng ◽  
Yanyan Zhang ◽  
Zidi Yan
Keyword(s):  
Tribological Properties ◽  
Friction Material ◽  
Frictional Material ◽  
Iron Based

In this work, we prepared an iron-based frictional material from vanadium-bearing titanomagnetite concentrates by in situ carbothermic reaction with improved tribological properties.

Modeling the impact–sliding wear characteristics of rare earth additive iron-based hardfacing alloys

2017 ◽  
Vol 231 (11) ◽  
pp. 1486-1499 ◽  
Author(s):  
Yogesh Kumar Singla ◽  
DK Dwivedi ◽  
Navneet Arora
Keyword(s):  
Rare Earth ◽  
Tribological Properties ◽  
Rare Earth Oxide ◽  
Oxide Content ◽  
Statistical Regression ◽  
Austenite Grain Size ◽  
Mechanical And Tribological Properties ◽  
Hardfacing Alloy ◽  
Iron Based ◽  
The Impact

This paper presents a systematic study of the effect of the cerium oxide content on the mechanical, microstructural and tribological properties of iron-based alloys. The results indicate that the microstructure of the hardfaced alloys is mainly composed of austenite, MC and M7C3 carbides. The primary austenite grain size was refined at first and then coarsened with the increase of the rare earth oxide additions. Meanwhile, the hardness of the hardfacing alloy was also increased. The increased area fraction of carbides was found to be beneficial for enhanced wear resistance. A statistical regression model was developed and verified with a number of test cases in order to evaluate the adequacy of the model. The optimal amount of rare earth was found to be less than 6 wt.%; below this composition, the microstructural, mechanical and tribological properties were excellent.

The effect of rare earth CeO2 on microstructure and properties of in situ TiC/Al–Si composite

2004 ◽  
Vol 58 (3-4) ◽  
pp. 432-436 ◽  
Author(s):  
Youming Liu ◽  
Bofan Xu ◽  
Wenyi Li ◽  
Xun Cai ◽  
Zhengwei Yang
Keyword(s):  
Rare Earth ◽  
Microstructure And Properties ◽  
In Situ Tic

Effect of rare earth oxides on the microstructure and properties of mullite/hBN composites

2017 ◽  
Vol 43 (3) ◽  
pp. 3356-3362 ◽  
Author(s):  
Han Jin ◽  
Zhongqi Shi ◽  
Xiaodan Li ◽  
Yongfeng Li ◽  
Hongyan Xia ◽  
...  
Keyword(s):  
Rare Earth ◽  
Rare Earth Oxides ◽  
Microstructure And Properties

scholarly journals Catalytic Oxidation of HCHO over the Sodium-Treated Sepiolite-Supported Rare Earth (La, Eu, Dy, and Tm) Oxide Catalysts

Catalysts ◽  
2020 ◽  
Vol 10 (3) ◽  
pp. 328 ◽  
Author(s):  
Ning Dong ◽  
Qing Ye ◽  
Mengyue Chen ◽  
Shuiyuan Cheng ◽  
Tianfang Kang ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Rare Earth ◽  
Catalytic Oxidation ◽  
Rare Earth Oxide ◽  
Catalytic Performance ◽  
Rare Earth Oxides ◽  
Hydroxyl Groups ◽  
In Situ Drifts ◽  
The Rare Earth

The sodium-treated sepiolite (NaSep)-supported rare earth oxide (RE/NaSep; RE = La, Eu, Dy, and Tm) samples were prepared using the rotary evaporation method. Physicochemical properties of these materials were characterized by XRD, SEM, BET, FTIR, XPS, H2–TPR, NH3–TPD, and in situ DRIFTS, and their catalytic activities for formaldehyde (HCHO) (2000 ppm) oxidation were evaluated. The results show that loading of the rare earth oxide on NaSep improved its catalytic performance. Among all the samples, Eu/NaSep performed the best, and complete HCHO conversion was achieved at a temperature of 150 °C and a gas hourly space velocity of 240,000 mL/(g h); a good catalytic activity was still maintained after 45 h of stability test. The catalytic oxidation mechanism of HCHO was studied using the in situ DRIFTS technique. As a result, the effective and stable catalytic performance of the Eu/NaSep sample was mainly due to the presence of hydroxyl groups on the sepiolite surface and the doped rare earth oxides, which contributed to its high performance. HCHO oxidation underwent via the steps of HCHO + O2 → HCOO− + OH− → H2O + CO2. It is concluded that the optimal catalytic activity of Eu/NaSep was associated with the highest Oads/Olatt atomic ratio, the largest amount of hydroxyl groups, the highest acidity, and the best reducibility. The present work may provide new insights into the application in the removal of high-concentration HCHO over the rare earth oxides supported on natural low-cost clays.

Role of rare-earth oxides and thoria as promoters in precipitated iron-based catalysts for Fischer-Tropsch synthesis

1991 ◽  
Vol 77 (1) ◽  
pp. 109-122 ◽  
Author(s):  
Ding-zhu Wang ◽  
Xiao-ping Cheng ◽  
Zhi-er Huang ◽  
Xiu-zhi Wang ◽  
Shao-yi Peng
Keyword(s):  
Rare Earth ◽  
Rare Earth Oxides ◽  
Tropsch Synthesis ◽  
Fischer Tropsch ◽  
Fischer Tropsch Synthesis ◽  
Iron Based ◽  
Iron Based Catalysts

Complex Modification on Microstructure and Properties in Mg2Si Reinforced Hypereutectic Al-Si Composite

2011 ◽  
Vol 299-300 ◽  
pp. 735-738
Author(s):  
Zheng Liu ◽  
Xiao Mei Liu
Keyword(s):  
Wear Resistance ◽  
Rare Earth ◽  
Rare Earth Oxides ◽  
Microstructure And Properties ◽  
Polygonal Shape

The effects of complex modification which mainly consisted of mixed rare earth oxides and CaCO3 on microstructure and properties in Mg2Si reinforced hypereutectic A1-Si composite were researched. The results indicated that the morphology of Mg2Si particle changed from irregular or crosses to polygonal shape, and its size obviously decreased. The hardness and wear resistance of the composite were improved by the complex modification.

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