Corrosion behavior of magnetic refrigeration material La–Fe–Co–Si in distilled water

Zhang, Min; Long, Yi; Ye, Rong-chang; Chang, Yuqing

doi:10.1016/j.jallcom.2010.12.122

Cited by 34 publications

(17 citation statements)

References 16 publications

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“…In the vicinity of corroded areas coarse corrosion product layers precipitate. These damage features are similar to those described by Zhang et al [19] and confirm a locally enhanced corrosion activity which may be related with galvanic coupling effects between the adjacent phases. Considering basically only the reactivity of the constituent elements of the alloy in distilled water [24], surface passivation and protection can be possible by formation of homogeneous layers of Fe-and La-hydroxides/oxides.…”

Section: Resultssupporting

confidence: 88%

“…Zhang et al [19] conducted fundamental studies with inductively molten and annealed ingot material exposed to distilled water under natural convective (stagnant) conditions. They proposed a first model mechanism for the corrosion process which is based on a galvanic coupling effect between the different phases.…”

Section: Introductionmentioning

confidence: 99%

“…Small amounts of either Mn or Co and C which are usually added to adjust the working temperature range of La(Fe,Si,X) 13 obviously have only marginal effects on the corrosion rates [20,21]. Moreover corrosion degradation has been shown to deteriorate the magnetocaloric effect of the material [22,19].…”

Section: Introductionmentioning

confidence: 99%

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Exploring corrosion protection of La-Fe-Si magnetocaloric alloys by passivation

2016

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Section: Resultssupporting

confidence: 88%

Section: Introductionmentioning

confidence: 99%

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Exploring corrosion protection of La-Fe-Si magnetocaloric alloys by passivation

2016

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“…Water is often chosen due to its very good heat transfer properties, nontoxicity and simplicity of use. However, the majority of modern applied magnetocaloric materials in the AMR corrode when in direct contact with water (for details see [122][123][124][125] where different corrosion inhibitors are considered). It was shown [28,101] that a mixture (e.g.…”

Section: The Impact Of the Heat Transfer Fluidmentioning

confidence: 99%

Active Magnetic Regeneration

Kitanovski

Tušek

Tomc

et al. 2014

Green Energy and Technology

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It is well known that the magnetocaloric effect of most magnetocaloric materials at moderate magnetic fields (up to 1.5 T) is limited to a maximum adiabatic temperature change of 5 K [1,2]. This value is not sufficient for such materials to be directly implemented into a practical cooling or heating device where temperature span over 30 K is required. Therefore, in order to increase the temperature span, one and so far the best option is for a heat regenerator to be included in the magnetic thermodynamic cycle.A heat regenerator is a type of indirect heat exchanger where the heat is periodically stored and transferred from/to a thermal storage medium (regenerative material) by a working (heat-transfer) fluid. The regenerative material usually has a porous structure, through which a working fluid is pumped in an oscillatory, counter-flow manner (which is more efficient than a parallel flow system). During the 'hot period', a warmer fluid flows through the regenerative material, which cools down, while the material heats up. As a result, heat is stored in the material. During the 'cold period', a cooler fluid flows through previously heated regenerative material, so the fluid heats up, while the material cools down. The heat is therefore transferred back to the fluid (the same fluid or a different one) at a different phase of the thermodynamic cycle. After a certain number of such steps, a periodic steady state is reached and, as a result, a temperature profile can be established along the length of the regenerator [3].The need to apply heat regenerators in a magnetic refrigerator was already realized by Brown [4] in the first prototype of a magnetic refrigerator, built in 1976. He applied a regenerative Stirling-like thermodynamic cycle (very similar to AMR), which significantly increased the temperature span of the device [4,5]. A few years later Steyert [6] and Barclay and Steyert [7] presented and explained the active magnetic regenerator, which remains the most applied method for the exploitation of the magnetocaloric effect at room temperature. Furthermore, all prototypes of magnetic refrigerators built since then have been based on the AMR process [5]. An AMR, unlike a passive (regular) heat regenerator, contains a magnetocaloric material as the regenerative material. It has a double function in a magnetic regenerator, i.e. it works as a regenerator and enables an increase in the temperature span as well as working as a coolant and generating/absorbing heat between the particular phases of the

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“…The availability of at least four magnetic refrigerant families (Gd-, Fe 2 P-, La(Fe, Si) 13 -and manganite-based) for prototype cooling engines has driven a recent increase in the study of refrigerant properties beyond the more-usually studied adiabatic temperature change and field-induced entropy change [5,6]. The properties studied include: magnetic hysteresis [7], corrosion resistance [8] and thermal conductivity (j) [9].…”

Section: Introductionmentioning

confidence: 99%

Influence of manganite powder grain size and Ag-particle coating on the magnetocaloric effect and the active magnetic regenerator performance

et al. 2015

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a b s t r a c tThe magnetocaloric performance of La 0.67 Ca 0.27 Sr 0.06 Mn 1.05 O 3 is investigated as a function of the powder grain size and also as a function of decoration of grains with highly conductive silver particulates as a coating layer. We demonstrate that the thermal and electrical conductivities can be significantly modified by the Ag-particle coating when the material is examined in sintered pellet form and we compare results with a second manganite composition La 0.67 Ca 0.33 MnO 3 with significantly smaller grain size. However, we find that this microstructural engineering does not improve the performance of the active magnetic regenerator cycle using the silver decorated material in powder form. The regenerator performance is improved by the reduction of the powder grain size of the refrigerant which we attribute to improved thermal management due to increased surface to volume ratio.

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Corrosion behavior of magnetic refrigeration material La–Fe–Co–Si in distilled water

Cited by 34 publications

References 16 publications

Exploring corrosion protection of La-Fe-Si magnetocaloric alloys by passivation

Exploring corrosion protection of La-Fe-Si magnetocaloric alloys by passivation

Active Magnetic Regeneration

Influence of manganite powder grain size and Ag-particle coating on the magnetocaloric effect and the active magnetic regenerator performance

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