Polycrystalline Mullite Fiber Veneer Block

Polycrystalline mullite fiber veneer blocks use adhesives or metal rivets to inlay fiber felts, blankets, plates or fiber prefabricated components on linings such as refractory bricks, lightweight bricks or refractory castables. Due to the insulation effect inside the furnace, the heat storage and heat dissipation of the furnace body are reduced, especially in intermittent heating furnaces with large temperature fluctuations. Polycrystalline mullite fiber veneer blocks are also more convenient to dismantle and repair, with low investment, fast construction, easy maintenance, and obvious energy saving. Polycrystalline mullite fiber veneer blocks, fiber product veneer specifications: thickness of 25mm, 50mm, 75mm, 100mm, the most used is 50mm.

Polycrystalline mullite fiber veneer block composite method When the board and blanket are stacked in multiple layers, the airflow impact easily leads to delamination. Since the 1980s, the vacuum-formed high-temperature polycrystalline mullite fiber veneer block is laid on the blanket (felt) to form a layer-laying-board-felt composite furnace lining structure. This new structure increases the use temperature of the layer lining, thereby improving the use value.

The fixing parts of the polycrystalline mullite fiber veneer block are A1₂O₃, with a content of not less than 94% corundum and Si₃N₄, with a content of not less than 95% silicon nitride.

Polycrystalline mullite refractory fiber is white, smooth, soft and elastic. The microstructure is composed of mullite microcrystals. Mullite is a relatively stable compound with weak recrystallization ability, that is, during the heating process, mullite microcrystals are not easy to aggregate and grow, which is beneficial to maintaining the strength of mullite fiber. The shrinkage rate of the heating line is low.

Mullite fiber has been widely used in thermal equipment such as box-type electric furnaces, heating furnaces, soaking furnaces and ceramic firing kilns. The maximum operating temperature is 1500℃ and the long-term operating temperature is 1350-1400℃.

The polycrystalline mullite fiber veneer block is made of polycrystalline mullite fiber cotton through special processing, compression and cutting. The product does not contain any binder or other ingredients, has excellent elasticity and flexibility, and the maximum operating temperature can reach 1600℃. When the polycrystalline mullite fiber veneer block is subjected to this temperature for a long time in an oxidizing atmosphere, a neutral atmosphere or a partially reducing atmosphere, it can still maintain its original toughness, strength and fiber structure. The product does not contain slag balls and can be used for the hot surface lining of various high-temperature industrial kilns. It has excellent thermal insulation performance and is currently one of the most ideal high-temperature kiln linings.

■ Good high temperature resistance;

■ Low heat capacity and low thermal conductivity;

■ Excellent thermal stability and thermal shock resistance;

■ Low heat storage;

■ High heat reflection performance;

■ Good sound absorption;

■ Anti-air flow scouring.

■ Various high-temperature industrial kiln insulation materials;

■ Ceramic kilns, mechanical and metallurgical heating furnaces, heat treatment furnaces and other hot surface linings of industrial kilns;

■ High-temperature fire-blocking and flame-isolating materials, kiln doors, kiln cars, expansion joints and other insulation materials;

■ Glass kiln insulation.

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