High temperature interaction between Si–B alloys and Si3N4

Jiao, Jianmeng; Tang, Kai; Safarian, Jafar; Grorud, Bettina; Sellevoll, Kathrine; Tangstad, Merete

doi:10.1016/j.ceramint.2021.01.249

Cited by 3 publications

(1 citation statement)

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“…Nitrogen would be in the form of a boron nitride (BN) phase in the Si melt if the melt is saturated with nitrogen. During research on the high-temperature interaction between Si-B alloys with Si 3 N 4 crucibles [29], the nitrogen solubility was estimated to be lower than 10 ppm mass at 1750 • C. BN precipitates were detected in the solidified Si-B alloys, in which BN particles were embedded in the SiB 6 phases. Furthermore, the size of the BN particles was less than 10 µm, which was not easy to find, and it was identified by using high contrast and high magnification in the cross-sectional images.…”

Section: Phase Stabilitymentioning

confidence: 99%

The Use of Fe-26Si-9B Alloy as Phase Change Material in Si3N4 Container

2022

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Fe-26Si-9B alloy was selected as a potential phase change material (PCM) to store energy at temperatures up to 1300 °C. A suitable refractory material is crucial to building a PCM container for Fe-26Si-9B alloy in thermal energy storage systems. The refractory material should have the ability to withstand corrosion from liquid Fe-26Si-9B alloy and should not pollute the alloy after long-term thermal cycles at high temperatures. In this work, Si3N4 was selected as a candidate refractory material. To investigate the interaction between Si3N4 and Fe-26Si-9B alloy, the wettability property of an Fe-26Si-9B/Si3N4 system was examined in a sessile drop furnace at temperatures up to 1350 °C. Moreover, Fe-26Si-9B alloy was subjected to 1–12 thermal cycles at temperatures between 1100 and 1300 °C, where the alloys were placed in Si3N4 crucibles in a resistance furnace under argon. According to the experiments, the equilibrium contact angle between the Fe-26Si-9B droplet and Si3N4 substrate was measured to be ~143°, which is non-wetting behavior. Microstructural analyses showed that FeSi, FeB, FeSiB3, and SiB6 were formed in the solidified Fe-26Si-9B alloy, in which FeSi + FeSiB3 constituted the eutectic structure. No nitride phases were introduced to the Fe-26Si-9B alloy, and no new interlayer was produced at the interface between the Fe-26Si-9B alloy and Si3N4 crucible after the thermal cycle experiments. In addition, the formed phases were stable with the increase in thermal cycles. All the results show that Si3N4 refractory material is suitable for Fe-26Si-9B alloy containers at high temperatures.

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Section: Phase Stabilitymentioning

confidence: 99%