I can't even begin to answer the original question because we can be using the term "firebrick" for two very different things. One are the insulating bricks that often come with modern stoves, a light weight and relatively fragile material incorporating vermiculite or perlite to reduce the weight and increase the insulating properties of a thin brick. The other is standard fire brick as a furnace building mason would understand it. Here at least the standard fire brick is slightly larger than a common brick and much stronger (they of course make larger ones for larger furnaces).
And yes, some wood stoves use, or used to use them (the "bear family" for example, I don't know if these are still made). And of course they are used in the fireboxes of masonry stoves.
The point I am making is that while the first might be considered a "consumable" the latter type should hold up a very long time.
Our "Defiant" rests on a custom made stove pad made of fire brick laid in black sand (for appearance of joints)
There is no possibility of social justice on a dead planet except the equality of the grave
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