It is already fully oxidized, so in a sense it has already been burned to the extent possible.
The US has been using transparent aluminum ceramics in very advanced weapon components for quite some time and our ability to fabricate it and work it has given us quite an advantage as this material has capabilities far outside the realm of any plausible substitute. It is nice to see that fabrication has become cheap enough for bulk product that they can use it in armor.
One of the other advantages this stuff has, beside being extremely tough and virtually impervious to all types of environmental damage, is that is transparent across a broad range of infrared as well visible light. One of the classical uses of it has been to protect the sensitive IR optical components of weapons operating under extreme environmental conditions -- think hypersonic terminal guidance where air friction alone is enough to ablate and melt most conventional materials.