Gravity effects on reactive settling of transition metals in liquid aluminum under SHS conditions

Unuvar, C.; Fredrick, D.; Anselmi‐Tamburini, Umberto; Shaw, Benjamin D.; Manerbino, A.; Guigné, J. Y.; Munir, Zuhair A.

doi:10.1016/j.actamat.2007.01.004

Cited by 6 publications

(2 citation statements)

References 21 publications

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“…Considering the high combustion temperature associated with the SHS reaction is related to the high enthalpy change between reactants and products [12], the parameters of reaction atmosphere, heating rate, loading density and so on could affect the SHS reaction, but they allow for control only to a certain degree by influencing diffusion mechanisms. Therefore, finding the suitable controlling method may be a great way to prepare the desired composite steel pipe with high comprehensive performance by the SHS-GS process [13][14][15]. In the experiment, comparing the Al-Fe 2 O 3 -Cr 2 O 3 reaction system with Al-Fe 2 O 3 reaction system, the phase composition, microscopic morphology and properties of the generated composite steel pipes were studied and discussed by XRD, SEM and EDS.…”

Section: Introductionmentioning

confidence: 99%

Strengthening Mechanism of Al2O3 Ceramic-Lined Composite Steel Pipe Prepared by the SHS Gravitational Separation Process

Hou

2018

MSF

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The Al2O3ceramic-lined composite steel pipes were produced by the SHS gravitational separation process (SHS-GS process) from Al, Fe2O3and Cr2O3as the raw materials within different reaction systems. The phase, composition, micro-structure and properties of ceramic coatings were investigated to discuss the strengthening mechanism of the composite steel pipe. The results showed that the phase composition of Al-Fe2O3-Cr2O3reaction system could be Al2O3and Fe-Cr alloy compared with the Al2O3-Fe-FeAl2O4phases of Al-Fe2O3reaction system, which led to the increase of strength and hardness of ceramic coating. Because the Fe-Cr alloy was formed instead of Fe element, and the addition of Cr2O3reduced the production of erodible FeAl2O4. The transition structure consisted of ceramic coating-transition layer-steel pipe was formed, and in its direction the Al and O element contents decreased, the metallic Fe and Cr increased. Therefore, the transitional changes of all the element contents could decrease the stress difference between the layers, and increase the bonding strength of the composite steel pipe.

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Section: Introductionmentioning

confidence: 99%

Strengthening Mechanism of Al2O3 Ceramic-Lined Composite Steel Pipe Prepared by the SHS Gravitational Separation Process

Hou

2018

MSF

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“…Therefore, it is necessary to form the transition structure whose performance changes gradually from steel pipe to ceramic coating. In the in-situ synthesis methods, the processes of the synthesis, densification, cooling and solidification are going on at the same time, so the diffusion reactions among them are always there in which it could result in the formation of the transition structure [10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Study on the Structural Analysis of Al2O3 Ceramic-Lined Steel Pipe Prepared with the Gravitational Separation SHS Method

Hou

Yang

et al. 2018

KEM

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One kind of Al2O3 ceramic-lined steel pipe was prepared with the gravitational separation SHS method by using the reaction system of Al-Fe2O3-Cr2O3. The element line scans of transition structure and the element plane scans of ceramic coating far away from transition layer were analyzed by Scanning Electron Microscopy and Energy Dispersive Spectroscopy, and then they were used to discuss the coating structure and interface bonding mechanism, and investigate the element composition distribution of coating. All of these were closely related to improving the properties of ceramic-lined steel pipe. The results showed that a transition layer was formed between metal pipe and ceramic coating, it was due to the gravitational separation and molecular diffusion motion of the reaction products in molten state; in the transition structure the amount of the reaction elements was gradually transitional from the direction of the coating-transition layer-steel pipe, which could reduce the stress difference between the layers; in the coating far away from the transition layer, only small amount of Fe embedded in the ceramic was left in the form of Fe-Cr alloy, while Cr was uniformly enriched in the Al2O3 ceramic, these all have great influence on the anti-corrosion ability of coating.

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Study on the preparation of the ceramic composite-lined steel pipe with the SHS reaction system of Al-Fe2O3-Cr2O3

Hou

Sheng

2017

Ceramics International

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Gravity effects on reactive settling of transition metals in liquid aluminum under SHS conditions

Cited by 6 publications

References 21 publications

Strengthening Mechanism of Al<sub>2</sub>O<sub>3</sub> Ceramic-Lined Composite Steel Pipe Prepared by the SHS Gravitational Separation Process

Strengthening Mechanism of Al<sub>2</sub>O<sub>3</sub> Ceramic-Lined Composite Steel Pipe Prepared by the SHS Gravitational Separation Process

Study on the Structural Analysis of Al<sub>2</sub>O<sub>3</sub> Ceramic-Lined Steel Pipe Prepared with the Gravitational Separation SHS Method

Study on the preparation of the ceramic composite-lined steel pipe with the SHS reaction system of Al-Fe2O3-Cr2O3

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