Ceramic fiber aluminum silicate insulation materials are high-performance and lightweight refractory and insulating materials, playing a crucial role in the high-temperature field of modern industry. aluminum silicate insulation materials is mainly made of metal oxides such as alumina and silicon dioxide through processes like melting, blowing or spinning to form fibers, and then processed into various forms such as blankets, felts, boards, paper, modules, special-shaped parts and loose cotton through needling, wet forming or vacuum forming.
The main components of aluminum silicate insulation materials are Al₂O₃ and SiO₂. The temperature resistance grade varies depending on the content of alumina.
Standard type (STD): Al₂O₃ approximately 44-47%, long-term service temperature approximately 1000°C.
High-purity type(HP): Approximately 47-49% Al₂O₃, with lower impurities such as Fe₂O₃, and a long-term service temperature of about 1100°C.
High alumina type(HA): Al₂O₃ approximately 52-55%, long-term service temperature approximately 1150°C.
Zirconium-containing type: By adding ZrO₂ (typically 15-17%) to Al₂O₃-SiO₂, the high-temperature stability is significantly enhanced, and the long-term service temperature can reach 1200-1300°C.
Core performance features (advantages) :
Extremely low thermal conductivity: This is one of its most important characteristics. The interwoven fiber structure contains a large amount of still air, which can effectively block heat transfer (conduction, convection and radiation), and its heat insulation effect is far superior to that of traditional heavy-duty refractory bricks.
Extremely low bulk density: The density is typically between 64 and 320 kg/m³ (depending on the product form), which is 1/5 to 1/10 of that of traditional refractory bricks. It greatly reduces the structural load of the kiln and saves steel.
Excellent thermal stability/thermal shock resistance: The fiber itself is flexible, and the product can withstand drastic temperature changes and impacts without cracking or peeling.
Good chemical stability: It performs stably in oxidizing and neutral atmospheres and can resist the erosion of various chemical substances (the specific corrosion resistance depends on the fiber composition and the usage environment).
Excellent flexibility and processability: Products such as blankets and felts are easy to cut, bend and wrap into complex shapes, and the modular design facilitates quick installation.
Low heat capacity: It stores less heat, heats up and cools down quickly, which is conducive to energy conservation and improving production efficiency.
Excellent sound insulation performance: The fiber structure also makes it an excellent sound-absorbing and sound-insulating material.
Easy to install and maintain: Simple and quick installation, and easy to repair and replace.
Typical application fields
Industrial furnace linings: furnace roofs, furnace walls, furnace doors, back insulation layers, etc. of various high-temperature furnaces and kilns such as steel and metallurgy (heating furnaces, soaking furnaces, annealing furnaces), ceramics (roller kilns, tunnel kilns), petrochemicals (cracking furnaces, conversion furnaces), glass (melting furnaces, annealing furnaces), non-ferrous metals (melting furnaces, holding furnaces), etc.
High-temperature pipeline and equipment insulation: Insulation and heat preservation for boilers, hot air pipelines, flues, valves, reactors, storage tanks, etc.
High-temperature sealing and gaskets: Sealing of kiln expansion joints, sealing of furnace doors, high-temperature flange gaskets, etc.
Fireproof and heat insulation: Building fireproof doors, firewalls, fireproof curtains, engine compartment heat insulation covers, etc.
Automobile exhaust system: Exhaust pipe insulation cover, catalytic converter wrap.
Ceramic fiber aluminum silicate insulation materials with their outstanding heat insulation performance, lightweight, excellent thermal shock resistance and ease of construction, have become indispensable key materials in modern high-temperature industries. It plays a significant role in energy conservation and consumption reduction, improving equipment efficiency, extending the service life of furnace linings, and lowering construction costs.
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