Ignition prevention of magnesium by simultaneous addition of calcium and zirconium

Chang, Sun O; Matsushita, Muneo; Tezuka, Hiroyasu; Kamio, Akihiko

doi:10.1080/13640461.1998.11819251

Cited by 14 publications

(7 citation statements)

References 1 publication

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“…3, besides the peaks of Mg and Mg 2 Ca, the peaks of MgO, CaO, and Al 2 O 3 were detected. It is thus obvious that these oxides, especially CaO [4][5][6][7], increased the ignition-proof properties of the Ca-containing AZ91 alloys. Fig.…”

Section: Resultsmentioning

confidence: 99%

“…However, the dense oxide film grows rapidly at elevated temperature and becomes porous since the Pilling-Bedworth ratio of magnesium oxide to magnesium is 0.84. In the previous work [4][5][6][7], calcium was added to magnesium alloys, and it was found that calcium additions were very effective in reducing continuous oxidation at high temperature. It was concluded that the alumina-like, compact and dense protective layer formed on the surface is the key contributor to the improved oxidation resistance.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Ca addition on the oxidation resistance of AZ91 magnesium alloys at elevated temperatures

Choi

You

Park³

et al. 2003

Met. Mater. Int.

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AZ91 magnesium alloys containing 0.27-5.22 wt.% Ca, were melted and cast to study the effects of Ca addition on oxidation resistance at elevated temperatures. An ignition temperature test showed that the ignition of AZ91 alloy occurred at about 350-450°C below the melting point, whereas that of the Ca-containing AZ91 alloys did so at above 650°C. Weight gain measurements indicated that the oxidation resistance of the AZ91 alloys improved with Ca addition. The oxidation rate was dependent on the oxidation temperature. In the temperature range of 300-400°C, the oxidation rate increased linearly. By contrast, the weight of 5 wt.% Ca-containing AZ91 alloy increased slowly due to the formation of a protective oxide layer. The oxidized surfaces were analyzed with low-angle XRD, FE-SEM equipped with EDS and AES. Complex structures were found in the oxide layers of the Ca-containing alloys: the outer layer mainly consisted of CaO, which was of uniform thickness, and the inner layer was a mixture of CaO, MgO, and Al 2 O 3 . In contrast to the loose and porous MgO formed on the surface of AZ91, the compact and dense oxide layers acted as an effective barrier to the further oxidation of the Ca-containing AZ91 alloys.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of Ca addition on the oxidation resistance of AZ91 magnesium alloys at elevated temperatures

Choi

You

Park³

et al. 2003

Met. Mater. Int.

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“…Recent years have seen several studies devoted to developing ignition‐resistant Mg alloys with alloying additions . Those studies focused on the addition of alloying elements to Mg commercial alloys, the testing of binary Mg alloys, or the development of higher order systems using a variety of AE and/or RE elements.…”

Section: Introductionmentioning

confidence: 99%

The Ignition Behavior of a Ternary Mg–Sr–Ca Alloy

Villegas-Armenta

Pekguleryuz

2020

Adv Eng Mater

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In this work, a Mg-Sr-Ca alloy is evaluated for ignition resistance. The simultaneous use of Sr and Ca results in an ignition temperature increase of %110 C compared to pure Mg. This is attributed to the formation of a compact oxide scale due to the modification of the native MgO scale. A new parameter, the effective Pilling-Bedworth ratio (EPBR), which is the molar volume ratio between the oxide formed and the substrate alloy, is developed. The EPBR of the composite oxide forming on the Mg-Ca-Sr alloy is found to be greater than 1, resulting in a protective scale due to the increased volume occupied by the oxide at the surface. In the solid state, the oxide scale is rich in CaO, with the SrO contribution being minimal. In the liquid state, SrO contribution increases. MgO:CaO % 1:15 MgO:CaO % 1:1 MgO:CaO % 4:1 MgO:CaO % 2:1 CaO:MgO:SrO % 32:16:1 CaO:SrO % 10:1 EPBR % 0.84 EPBR % 0.97 EPBR % 1.05 EPBR % 1.01 EPBR % 1.03 EPBR % 1.16 670 C, 15 min M/O interface (1000 nm) Middle oxide (500 nm) G/O interface CaO:MgO:SrO % 4:40:3 CaO:MgO:SrO % 3:16:2 CaO:MgO:SrO % 5:1:9 EPBR % 0.85 EPBR % 0.89 EPBR % 1.33

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“…In this case, the use of a magnesium (Mg) alloy is attracting attention because the Clarke number of Mg is high, and Mg has the lowest density of commercial metals. The non-combustible Mg alloy used in this study is a material which has an improved resistance of being easy to burn by the addition of about 2% calcium (Ca) to the conventional Mg alloy (Sakamoto et al, 1997;Chang et al, 1998;Akiyama et al, 2000;Masaki et al, 2008). Figure 3 shows the relationship between the ignition point and the Ca content of the Mg alloys (Sakamoto et al, 1997).…”

Section: Characteristics Of Non-combustible Mg Alloymentioning

confidence: 99%

“…Therefore, if we test the effect of the mean stress on the fatigue strength of this material, the effect would be hidden in the scatter and the effect becomes uncertain. In this study, we propose an evaluation method for the mean stress effect of the inclusion-induced scattered fatigue strength using the non-combustible Mg alloy AMX602B (X=Ca) (Sakamoto et al, 1997;Chang et al, 1998;Akiyama et al, 2000). We discuss the equivalence of an artificial defect and an actual defect (inclusion).…”

Section: Introductionmentioning

confidence: 99%

Evaluation Method for Mean Stress Effect on Fatigue Limit of Non-Combustible Mg Alloy

Morishige¹,

Maeda²,

Hamada³

et al. 2011

Magnesium Alloys - Design, Processing and Properties

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Ignition prevention of magnesium by simultaneous addition of calcium and zirconium

Cited by 14 publications

References 1 publication

Effect of Ca addition on the oxidation resistance of AZ91 magnesium alloys at elevated temperatures

Effect of Ca addition on the oxidation resistance of AZ91 magnesium alloys at elevated temperatures

The Ignition Behavior of a Ternary Mg–Sr–Ca Alloy

Evaluation Method for Mean Stress Effect on Fatigue Limit of Non-Combustible Mg Alloy

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