Does molten magnesium react with silica?

[Nik_2213]

World-building: Assume *passive* atmosphere or processing in vacuum...

Does molten magnesium react with pure silica, SiO₂, as powder or glass-fibre ??

Would it even 'wet' the glass ??
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I'm world-building environment where iron is as exotic as our titanium was, perhaps only 'meteoric', but there is sufficiently low Oxygen, moisture etc for magnesium to be 'safe'.
eg NO problems with B_29 crank-case equivalents over-heating, igniting, burning through main wing spar...

 

[Baluncore]

Does molten magnesium react with pure silica, SiO2, as powder or glass-fibre ?

Silicon is usually refined by heating quartz sand with carbon, in an electric arc furnace, to remove oxygen. Your question may become, can the carbon be replaced by magnesium ?
That is a chemical process called magnesiothermic reduction, which reduces release of CO₂. Magnesium powder reduces silicon dioxide to form elemental silicon and magnesium oxide, MgO, which is valuable as a high temperature electrical insulator.

Does molten Mg have sufficient energy to heat the glass to reaction temperature, or is further energy needed. It should be possible to retain the heat, to maintain the reaction. You will also need to keep atmospheric oxygen away from that high temperature reaction, or the Mg would burn in air to produce MgO + SiO₂.
https://en.wikipedia.org/wiki/Hydrogen_assisted_magnesiothermic_reduction