Question

Can a brick on heating change to liquid state of the brick?

Answer 1

Brick is composed of several materials such as clay, lime, small aggregates etc. If we talk about the chemical composition, they mainly contain silica, alumina. iron oxides, calcium oxide/hydroxide, magnesium oxide etc.
During its manufacture when the brick is heated, it is done to increase its durability. If the bricks are overheated, they get burnt (and brittle).
If we continue to heat the brick, the compounds will get broken down to the simpler stable compounds and the brick will stop being a brick. If we continue to heat these stable compounds (preferably in the absence of air to prevent further oxidation), the solid stable compounds will ultimately change their state to liquid form