Diffusion path during internal displacement reactions in multi-component oxides: Reaction between Fe and (Co,Mg)TiO3 solid solution at 1273K

Reddy, S. N. S.; Sundlof, B.; Jacob, Κ. T.

doi:10.1016/j.ssi.2010.11.017

Cited by 1 publication

(2 citation statements)

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“…The Mg profile can be explained in terms of variation of activity coefficients in the pseudo-ternary titanate solid solution and cross-coefficients in the transport coefficient matrix. A detailed description and analysis of transport processes in this reaction-diffusion couple is published elsewhere [15]. A similar pattern of composition profiles was also observed for the couple Fe:(Mg,Ni)TiO 3 [16].…”

Section: Complex Microstructuressupporting

confidence: 60%

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Reactive Interdiffusion: A Method for Making Composition Graded Metal-ceramic Composites

Reddy

Jacob

Rajitha

2012

High Temperature Materials and Processes

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Presented is a new method for making composition graded metal-ceramic composites using reactive interdiffusion between a metal and a complex ceramic. Composition variation in both metal and ceramic phases with distance along the direction of diffusion is achieved. The design criteria for developing such composites are discussed. The system should exhibit extensive solid solubility in both metallic and ceramic phases, a defined gradation in the stabilities of the oxides, and mobility of electrons or holes in the oxide solid solution. The complex ceramic used for making the composite should be polycrystalline with sufficient porosity to accommodate the volume expansion caused by alloy precipitation. An inert atmosphere to prevent oxidation and high processing temperature to facilitate diffusive transport are required. The process is illustrated using the reaction couples Fe-NiTiO 3 , Fe-(Mg,Co)TiO 3 and Fe-(Ni,Co)TiO 3 .

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Section: Complex Microstructuressupporting

confidence: 60%

“…The ceramic matrix may be a single crystal or poly-crystalline, single-phase or multi-phase. The method evolved from studies on internal displacement reactions in ternary and higher order oxides which have been published [13][14][15][16]. The results suggested a new method for making composition-graded metal-ceramic composites.…”

Section: Introductionmentioning

confidence: 99%