What are the high strength refractory fibers and what are the fiber resistant fire retardant coating

1. Classification according to the form of the material.

1) Bulk refractory material: characterized by elastic, loose thermal insulation filler. For example: loose refractory fiber cotton.

2) Shaped refractory fiber: a microporous shaped secondary product processed from bulk refractory fiber. For example: refractory fiber felt, blanket, paper, board, components, special-shaped products, woven products.

3) Amorphous refractory fiber: It is prepared with bulk refractory fiber as aggregate, binder and additive. For example, refractory fibers can be plastic, castables, ramming materials and coatings.

4) Mixed refractory fiber: It is made of microporous shaped fiber products by mixing crystalline fiber and amorphous fiber in a certain proportion. For example: all kinds of mixed refractory fiber products.

2. Classification according to the use temperature.

1) Natural: such as asbestos, rock wool, the use temperature < 600

2) Amorphous: glass fiber, service temperature< 400; slag wool, the use temperature is 1000 1150; Vitreous silicon fiber, service temperature < 1000; Aluminum silicate fiber series (ordinary silicon silicate fiber, service temperature 1000; High purity aluminum silicate fiber, service temperature 1100; High alumina aluminum silicate fiber, service temperature 1200; Contains Cr2O3 aluminum silicate fiber, service temperature 1200; Contains ZRO2 aluminum silicate fiber, the service temperature is 1300 1350 )

3) Polycrystalline: boron nitride fiber, service temperature< 1800; Mullite fiber, operating temperature< 1400 ; Alumina fiber, operating temperature< 1400 °C; Zirconia fiber, operating temperature< 1600 ; Silicon carbide fiber <1700; Carbon fiber, operating temperature< 2500 ; Potassium titanate fiber, service temperature 1100 1200.

4) Monocrystalline: SiC fiber, operating temperature< 2000; MGO fiber, service temperature < 1800.

Refractory fiber, also known as ceramic fiber, can be processed into blankets, felts, threads, cotton, ropes, belts, plates and other shapes. Refractory fibers have the following characteristics:

1) High temperature resistance The long-term service temperature of ordinary aluminum silicate refractory fiber can reach 1000, and the long-term service temperature of alumina and zirconia fiber can reach 1400The maximum use temperature of glass wool, slag wool, asbestos, etc. is only 580-830

2) low thermal conductivity refractory fiber at high temperature thermal conductivity is very low, at 1000 is only 20% of clay refractory bricks, 38% of lightweight bricks, refractory fiber made of furnace tank, its thickness can be thinned by about half.

3) The density of refractory fiber is small, the weight is light, only 1 10-1 20 of general refractory materials, and 1 5--1 10 of ordinary thermal insulation materials

4) Less heat storage The heat storage of the furnace wall made of refractory fiber is only about 1 4 of the general furnace, so the heating time of the furnace body is short.

5) Good thermal shock resistance Because the refractory fiber is soft, elastic, excellent resistance to quenching and quenching, and has strong thermal shock resistance.

6) Good insulation performance, good sound insulation effect, can be used as high temperature insulation material and sound absorbing material.

7) Good chemical stability: It is not attacked by general acids and alkalis in heat treatment equipment.

8) Poor pressure resistance It cannot be used to lay the bottom of the furnace, and the scouring ability of high-speed gas flow is poor.

Second, the category of refractory fiber.

Aluminum silicate fiber.

ALSIO3 is produced from light clay clinker by melting and injection into fiber process by resistance or electric arc furnace. Aluminum silicate fiber, also known as ceramic fiber, is a new type of lightweight refractory material, the material has the advantages of light bulk density, high temperature resistance, good thermal stability, small heat capacity, good mechanical vibration resistance, small thermal expansion, good thermal insulation performance, etc., after special processing, it can be made into aluminum silicate fiber board, aluminum silicate fiber felt, aluminum silicate fiber rope, aluminum silicate fiber blanket and other products. The new sealing material has the characteristics of low thermal conductivity of high temperature resistance, light bulk density, long service life, high tensile strength, good elasticity and non-toxic, and is a new type of material to replace asbestos, which is widely used in metallurgy, electric power, machinery, chemical thermal energy equipment insulation.

High alumina refractory fibers.

High-alumina refractory fiber is based on the general aluminum silicate raw material, adding Al2SiO3 to form alumina components, which is melted and blown into microfiber by electric furnace, and the refractory degree is improved, and it is still an amorphous fiber.

Contains zirconium refractory fibers.

The product is a fiber made of ZRo2 on the basis of aluminum silicate raw material, which is still an amorphous fiber.

Polycrystalline alumina fibers.

This product is mainly W (Al2SiO3) in about 70% mullite fiber, W (Al2SiO3) in about 95% of alumina fiber and zirconia fiber, is a microcrystalline structure, using colloidal method and precursor method manufacturing, the working temperature is up to 1600, belongs to the high temperature kiln.

Refractory fiber type and operating temperature.

Refractory fibers are glass-phase or crystalline phase binary compounds composed of Al2O3 and SiO2 as the main components. It is also possible to participate in beneficial ingredients such as Cr2O3 and so on. Other components in the fiber such as Fe2O3, CaO, Mgo, Na2O, B2O3, TiO2, etc. are impurities.

Refractory fiber type and operating temperature.

There are five crystalline phase structures in the refractory series, namely mullite (3Al2O3·SiO2), cristobalite (SiO2), lepidite quartz (SiO2), corundum (Al2O3) and aluminum-oxygen (Al2O3), which is a steady-state structure. The other type of glass phase structure is less stable because it is formed under conditions that are not conducive to crystallization, i.e. when the fibers are manufactured due to melting temperatures below the melting point of Al2O3 (melting point 2050) or SiO2 (1713).

When there is no adulterated component in the refractory fiber, the higher the Al2O3 content, the higher the service temperature: when the al2O3 content of the refractory fiber is the same and there is the adulterated component Zro2, the service temperature of the fiber is higher than that of the unadulterated component. In addition to the different Al2O3 content, another difference between low-temperature and medium-temperature fibers is that the former contains more Fe2O3 impurities (about 3% mass fraction), while the latter contains less impurities (about 1% mass fraction).

The glass phase structure transforms into a crystalline phase at a specific temperature, a phenomenon known as crystallization. Crystallization leads to fiber shrinkage and pulverization, so the addition of ** shrinkage is the basis for specifying the use temperature of refractory fibers. Excessive shrinkage of the fibers causes the sealing properties of the furnace lining to be destroyed.

Refractory fiber products are a new type of refractory materials, and have the role of refractory and thermal insulation, and have many advantages such as light weight, low thermal conductivity, small specific heat, good thermal stability, high temperature resistance, thermal shock resistance and mechanical sensation resistance, softness, easy construction, etc., used as industrial kiln lining materials, can save energy about 30, reduce the quality of the furnace lining more than 90, save 20 50 steel for the furnace body, is a new type of lightweight refractory material initiated and selected when designing and producing high thermal power electric furnaces.

Blankets, felts, papers, boards, ropes, vacuum shaped products, etc., are made of refractory fiber cotton, and these shape characteristics provide great convenience for the masonry of electric furnaces. The fiber can be squeezed to the cracks and all defects of the brick electric furnace, coupled with the short heating and cooling cycle of the refractory fiber furnace lining, which greatly reduces the power consumption and improves the working power. The disadvantage is that this material is currently more expensive to produce and therefore subject to certain constraints on its use.

There are many ways to produce refractory fibers, and the following are the first to be introduced:

1) Melt injection method. The raw material is melted in a high-temperature electric furnace to form a stable stream and is drawn out, and is sprayed into a fiber filament with compressed air or high-pressure steam.

2) Melt refining method and reversal method. The high-temperature furnace melts the material to form strands, which are then refined or passed through a high-speed reversing drum to make fibers.

3) High-speed centrifugation. Use a high-speed centrifuge to spin the stream into fibers.

4) Colloidal method. The refractory raw materials are formulated into colloidal salts, and solidified into fiber bodies under certain conditions, and finally calcined into fibers.

Hello, 1. Fiber-reinforced epoxy fire-retardant coating: composed of fiber-reinforced materials, epoxy resin and graphite, it has good waterproof, moisture-proof, corrosion-resistant, heat-resistant and wear-resistant properties, and can be used for fire protection of steel structures or reinforced concrete structures. 2. Polyurethane fireproof coatings

Composed of polyurethane resin, fiber reinforced materials, fire extinguishing agents and fillers, the flame retardant has good heat resistance, waterproof, corrosion resistance and wear resistance, and can be used for fire protection of steel structures and reinforced concrete structures. 3. Glass fiber reinforced spandex fire retardant coating: It is composed of glass fiber reinforced material, spandex and fire killer, which has good heat resistance, waterproof, corrosion resistance and wear resistance, and can be used for fire protection of steel structures and reinforced concrete structures.

4. Glass fiber reinforced aluminum silicate fireproof coating: It is composed of glass fiber reinforced material, aluminum silicate and fire killer, which has good heat-resistant, waterproof, corrosion-resistant and wear-resistant properties, and can be used for fire protection of steel structures and reinforced concrete structures. 5. Glass fiber reinforced calcium silicate fireproof coating:

It is composed of glass fiber reinforced material, calcium silicate and fire defader, which has good heat, waterproof, corrosion and wear resistance, and can be used for fire protection of steel structures and reinforced concrete structures. 6. Glass fiber reinforced neoprene fire retardant coating: It is composed of glass fiber reinforced material, neoprene and fire extinguisher, which has good heat resistance, waterproof, corrosion resistance and wear resistance, and can be used for fire protection of steel structures and reinforced concrete structures.

Answer]: a, b, c, e

2022 Textbook P126 2021 Textbook P124

Knowledge points: the classification of the furnace and the classification and performance of refractory materials. Refractory fiber: high temperature resistance, good thermal insulation performance, high thermal insulation efficiency, good chemical stability, strong thermal shock resistance, good insulation and sound insulation performance.

The difference between refractory fiber and glass fiber: ceramic fiber tape is a kind of fire-resistant and fireproof material, which is produced by high-purity Yuandenier refractory fiber and is used in the field of high-temperature heat insulation. The raw material of glass fiber belt has the following characteristics compared with naturally occurring cellulose fiber:

Fiberglass fireproof, used for the decoration of fireproof roller shutters, cable fireproof, can also be used as a fireproof isolation cloth for construction operations. The fireproof cloth is suitable for welding and other occasions where there are sparks and are easy to cause hail and fire, and can resist spark splashes, slag, welding spatter, etc., so as to isolate the workplace, separate the working layer, and eliminate the fire danger that may be caused in welding work; It can also be used for light insulation, and at the same time establish a safe and clean working space.

These: What are PPC plastics and how can they be identified by appearance?

Re: PPC belongs to the PP category, the full name is chlorinated polypropylene, which is used to manufacture daily necessities, electrical appliances, etc.

2. I am engaged in the crushing of waste plastics, what are the waste plastics now**(2004-11-9)?

Re: polypropylene material (woven bag): 1200-1600 yuan ton; Polypropylene material (pot and barrel material):

2100-2600 yuan ton; Polyethylene (soft material): 2300-3300 yuan tons; Polyethylene (hard material): 2700-3800 yuan ton; PVC:

2500-3100 yuan ton; Foam: 2000-3300 yuan tons; Polyester (mineral water bottle): 5000-5800 yuan ton;

3. What is the type of raw material used for the production of HDPE gas pipes and water supply pipes?

Re: The raw materials used for the production of HDPE gas pipes and water supply pipes are PE80 and PE100

4. What kind of material is PPN?

Re: PPN is a type of polypropylene.

5. What is the best elastic EVA now<2004-11-21 >?What grade? If you want to make it domestic, what is there for flexible polyvinyl chloride for injection molding?

Re: The domestic EVA is basically produced in Beijing, which is divided into extrusion grade type 14 (va=14) general purpose film, type 18 (va=18) foam, and injection grade type 5 (va=5) food packaging film.

High-temperature resistant fibers can be divided into inorganic high-temperature resistant fibers and organic high-temperature resistant fibers. Inorganic high-temperature fiber varieties usually include carbon fiber, ceramic fiber, boron fiber, glass fiber, etc. Quartz fiber is a kind of glass fiber, which belongs to special glass fiber, and the long-term use temperature can reach 1050.

Shen Jiu specializes in this.

1. Furnace door sealing and furnace curtain of various heat-insulating industrial kilns.

2. High-temperature flue, bushing of air duct, and expansion joint.

3. High-temperature thermal insulation and heat preservation of petrochemical equipment, containers and pipelines.

4. Protective clothing, gloves, head covers, helmets, boots, etc. in high temperature environments.

5. Heat shield of automobile engine, wrapping of exhaust pipe of heavy oil engine, composite brake friction liner of high-speed racing car.

6. Sealing packing and gasket for pumps, compressors and valves for transporting high-temperature liquids and gases.

7. High temperature electrical insulation.

8. Fireproof doors, fireproof curtains, fire-extinguishing blankets, mats for sparks and heat-insulating covers.

9. Thermal insulation, thermal insulation materials and brake friction pads for aerospace and aviation industries.

10. Thermal insulation and wrapping of cryogenic equipment, containers and pipelines.

11. Thermal insulation, fireproof partition and fireproof curtain of archives, vaults, safes and other important places in high-end office buildings.