I noticed the word "fire brick" used often in the replies to this post.
After researching "fire bricks/ kiln bricks" online, I am a bit confused and am hoping to get some clarification.
Are actual Fire Bricks/ Kiln Bricks best for making heat caves, to heat ingot molds and crucibles?
It seems that they are refractive...that they soak up and hold heat...and hold up well (don't break down) under high heat...although, it does seem as though there are two types...refractive (hard), and insulating (soft)...which makes me even more confused...
Would it be better to make a heat cave with reflective materials, where the bricks/ boards reflect heat back at the object?
I am asking for a friend, who has purchased fire bricks, but after further research, we are now confused as to whether fire bricks would be the proper/ best choice.
I am thinking the goal would be to create an environment for the ingot mold and crucible to get up to temp and then maintain it...so, reflective sounds like it would be the better choice? Or are fire bricks better because they hold the heat and then do they radiate heat back at the object? or continue to heat soak away from the object?
Any advice would be greatly appreciated!