The Experts below are selected from a list of 10923 Experts worldwide ranked by ideXlab platform
Xiangdong Yang - One of the best experts on this subject based on the ideXlab platform.
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Liquid-phase Aluminizing of Ti-6Al-4V with a nanostructured surface layer
Materials Letters, 2017Co-Authors: Q.s. Mei, Mao Liu, Feitai Chen, Xiangdong YangAbstract:Abstract The effect of surface nanostructuring on the liquid-phase Aluminizing of Ti-6Al-4V alloy is investigated. A composite interaction layer of TiAl3 and Al is formed in samples with a nanostructured surface layer after liquid-phase Aluminizing, of which the thickness is significantly larger than that of the coarse-grained samples, due to the enhanced formation of TiAl3 with more dispersed distribution. Fragmentation and migration of the nanostructured surface layer of the matrix during liquid-phase Aluminizing is evidenced, which is responsible for the distinct Aluminizing microstructure in surface nanostructured samples.
Z D Xiang - One of the best experts on this subject based on the ideXlab platform.
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relationship between pack chemistry and aluminide coating formation for low temperature aluminisation of alloy steels
Acta Materialia, 2006Co-Authors: Z D Xiang, P K DattaAbstract:Abstract A theoretical analysis is provided to relate the coating layer growth kinetics to the pack chemical composition and processing conditions under a set of defined thermodynamic and kinetic conditions for aluminising alloy steels at temperatures below 700 °C in an effort to increase their high-temperature oxidation resistance whilst maintaining their microstructure and hence mechanical strength and creep resistance. A series of experiments were subsequently carried out on a type of commercial alloy steel P92 (12Cr–1Mo) in AlCl3-activated packs containing Al as the depositing source and Al2O3 as inert filler with the aluminising temperature varying from 500 to 700 °C, pack Al content from 1 to 30 wt.% and aluminising time from 1 to 16 h to determine the effects of these parameters on the coating growth kinetics and microstructure and hence to check the validity of the assumptions made in the theoretical analysis. The applicability of this analysis in the cases of aluminising steels using different halide salts as activators is also assessed, which highlighted the limited choice of activators available for aluminising alloy steels in the low-temperature range concerned.
Pibo Liao - One of the best experts on this subject based on the ideXlab platform.
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microstructure and high temperature corrosion behaviors of aluminide coatings by low temperature pack Aluminizing process
Applied Surface Science, 2010Co-Authors: Zhaolin Zhan, Zhong Liu, Jianxiong Liu, Pibo LiaoAbstract:Abstract Aluminide coatings were produced on carbon steel and Fe–5Cr–Mo alloy at a relatively lower temperature below 600 °C in shorter treatment time by a combination of surface refinement process and pack Aluminizing process. Repetitive ball impact, generated by mechanical vibration, caused the top-layer refinement of substrates in a conventional pack Aluminizing process. The effects of temperature and treatment time on the formation of aluminide coatings were analyzed. The microstructure of the coatings was investigated by SEM, AFM and XRD. The aluminide coatings were one-layer, compacted structure with ultrafine grains and uniform elemental distribution. High-temperature oxidation and sulphidation tests were carried out at 600 °C in air for 200 h and 10% SO 2 + Ar gas mixture atmosphere for 50 h, respectively. The mass gains and spallation indicated that the aluminide coatings significantly improved the high-temperature oxidation and sulphidation resistance.
Guoqu Zheng - One of the best experts on this subject based on the ideXlab platform.
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high temperature oxidation resistance of γ tial alloy with pack Aluminizing and electrodeposited sio2 composite coating
Corrosion Science, 2019Co-Authors: Guangya Hou, Huazhen Cao, Yiping Tang, Huibin Zhang, Guoqu ZhengAbstract:Abstract A novel Si-Al composite coating was prepared on γ-TiAl alloy by a two-step method. Firstly, an Aluminizing coating was fabricated on γ-TiAl alloy via pack cementation technique. Then a SiO2 coating was prepared on this Aluminizing coating via cathodic electrodeposition. The high temperature oxidation resistance of this composite coating was evaluated under 1000 °C. During the oxidation process, this Si-Al composite coating can react with TiAl and prevent the inward diffusion of oxygen from air to the film/alloy interface, resulting in the remarkable decreased oxidation rate of the alloy.
Eryong Liu - One of the best experts on this subject based on the ideXlab platform.
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improving the tribocorrosion resistance of monel 400 alloy by Aluminizing surface modification
Journal of Materials Engineering and Performance, 2018Co-Authors: Yimi Gao, Zhixiang Zeng, Eryong LiuAbstract:A pack Aluminizing treatment was performed to improve the tribocorrosion resistance of Monel 400 alloy. The microstructure of the coating was investigated using SEM, XRD, and TEM. The mechanical property of Aluminizing coating was studied by microhardness tester. The tribocorrosion behavior of Monel 400 alloy and Aluminizing coating in artificial seawater was revealed, using a reciprocating tribometer integrated with an electrochemical workstation. The results show that the single-phase Ni2Al3 was obtained on Monel 400 alloy surface by pack Aluminizing at 900 °C for 4 h. The tribocorrosion resistance of Monel 400 alloy was improved after Aluminizing. The mechanism of improvement in tribocorrosion resistance by Aluminizing is that the high hardness of Aluminizing surface modification coating results in a reduction in the material loss volume of wear-induced corrosion. The Aluminizing coating exhibits better tribocorrosion resistance than that of Monel 400 alloy in seawater.