Polycrystalline mullite fiber is a type of polycrystalline alumina fiber, with Al2O3 content ranging from 72% to 75%. Generally, if the Al2O3 content exceeds 80%, it is called polycrystalline alumina fiber.
The main crystal phase of polycrystalline mullite fiber is a single mullite phase, which is the most thermally stable type of polycrystalline alumina fiber used at high temperatures, with a product used at temperatures above 1400 ℃.
Polycrystalline mullite fiber (PMF) is the latest type of ultra lightweight high-temperature refractory fiber both domestically and internationally. It is a type of ceramic fiber in the entire Al2O3-SiO2 system and can be used at temperatures between 1500-1700 ℃, which is 200-400 ℃ higher than that of glassy fibers. Production technology of polycrystalline mullite fiber. A company in Zhejiang Province completed the major scientific research project of "Crystalline Fiber Research" issued by the Zhejiang Provincial Science and Technology Commission in March 1983, and was the earliest unit in China to obtain the technical appraisal of this technology. After years of hard work, we have acquired exquisite production experience and reliable quality assurance, and provide a series of after-sales service measures such as application technology consultation, installation and construction.
The launch of polycrystalline mullite fibers on the market provides a material foundation for designers and researchers to design new equipment, develop new products and processes; Providing the most ideal means for industrial and mining enterprises with thermal equipment to renovate old equipment, increase production, save energy, and improve the environment, even if progress is made.
Scope of application
Polycrystalline mullite fiber products can be used as insulation materials in high-temperature thermal equipment below 1600 ℃ for a long time, such as silicon carbide electric furnaces, molybdenum silicide electric furnaces, various steel heating furnaces, mechanical forging furnaces, etc., which can significantly improve equipment thermal efficiency, greatly save energy, increase production rate, and improve product quality.
Can be applied to insulation of various high-temperature industrial kilns; Ceramic kiln; Mechanical and metallurgical heating furnaces; Hot surface lining of heat treatment furnaces and other industrial kilns; High temperature flame blocking; Thermal insulation materials such as kiln doors, kiln cars, expansion joints, etc; Glass kiln insulation.
classification
Polycrystalline mullite fibers are widely used in high-temperature industrial kilns and other thermal equipment lining insulation in metallurgy, machinery, ceramics, electronics, petrochemicals, aerospace and other fields. It can achieve the goals of energy conservation, increased production, reduced temperature difference inside the furnace, improved product quality, reduced spare parts consumption, extended furnace life, and improved working environment. According to the different scope of application, it can be divided into:
Polycrystalline mullite fiber cotton
Polycrystalline mullite fiber veneer block
Polycrystalline mullite fiberboard
Polycrystalline mullite fiber shaped products
Polycrystalline mullite fiber felt
Polycrystalline mullite fiber blanket
Polycrystalline mullite fiber module
Polycrystalline mullite fiber paper
Polycrystalline mullite fiber electric heating module
Physical and chemical data
Chemical composition: Al2O3 72-80% SiO2 18-27%
Physical properties and appearance: pure white
Diameter: 3-5 μ Length: 20-80mm
Crystal phase: 3Al2O3 · 2SiO δ - Al2O3
Product performance:
Loose cotton: Bulk density of 30-60kg/m
Using temperature oxidation atmosphere at 1600 ℃ and reducing atmosphere at 1350 ℃
Blanket: Basic dimensions 200 × 100 × (30-60) mm
Bulk density 100 kg/m
Re burning shrinkage rate<1% (1500C × 6hr)
Use temperature electric furnace 1600C flame furnace 1400C
Thermal conductivity 600C 0.13 w/m · k
1000C 0.25 w/m·k
1400C 0.45 w/m·k
(Excluding organic/inorganic binders)
Plate shape: Basic dimensions 400 × 600 × (20-40) mm
Bulk density 220-300 kg/m
Re burning shrinkage rate<1% (1400C × 6hr)
Operating temperature 1600C
Thermal conductivity: 600C 0.10 w/m · k
1000C 0.21 w/m·k
1400C 0.43 w/m·k
