Full-fiber burner brick and preparation method thereof

A full-fiber burner brick, comprising a full-fiber brick body and a coating coated on surface of the full-fiber brick body;

• the full-fiber brick body is prepared from a raw material including the following components in mass ratio:
• alumina crystal fiber
• 20%~50%;
• amorphous ceramic fiber
• 5%~20%;
• fine powder filler
• 20%~50%;
• inorganic binder
• 30%~50%;
• organic binder
• 5%~15%;
• flocculant
• 1%~5%;
• the alumina crystal fiber is composed of a combination of fibers of different lengths, and mass ratio of the fibers of different lengths in the alumina crystal fiber is:
• 0.01 mm ≤ length < 0.05 mm
• 25%~35%;
• 0.05 mm ≤ length < 0.1 mm
• 35%~45%;
• 0.1 mm ≤ length < 1 mm
• 25%~35%;
• the amorphous ceramic fiber is composed of a combination of fibers of different lengths, and mass ratio of the fibers of different lengths in the amorphous ceramic fiber is:
• 0.01 mm ≤ length < 0.05 mm
• 25%~35%;
• 0.05 mm ≤ length < 0.1 mm
• 35%~45%;
• 0.1 mm ≤ length < 1 mm
• 25%~35%;
• the coating is formed by a paint comprising the following components in mass ratio:
• high-temperature resistant inorganic fiber
• 10%~50%;
• reinforcing filler
• 10%~20%;
• high-temperature expansion filler
• 5%~15%;
• skeleton filler
• 7%~30%;
• nanopowder
• 3%~10%;
• inorganic suspending agent
• 0%~20%;
• inorganic binder
• 10%~50%;
• organic additive
• 3%~15%;
• and
• water accounting for 10%˜50% of a total mass of all the above components;
• a length of the high-temperature resistant inorganic fiber is 0.01˜1 mm;
• the reinforcing filler is selected from one or more of acicular microsilica powder and pyrophyllite powder;
• the high-temperature expansion filler is selected from one or more of kyanite powder and sillimanite;
• the skeleton filler is selected from one or more of mullite powder and zircon powder;
• the nanopowder is selected from one or more of nano silica and nano alumina powder;
• the inorganic suspending agent is bentonite.