Alumina continuous fibre is made of alumina and silica as the main component, and is prepared by sol-gel process. It can be used for high temperature above 1000℃ for a long time. It can be woven into soft fabric like fibre rope and fibre cloth. It can also be used for making many kinds of composite materials, and the form is convenient and flexible. It is an emerging high-tech industry and a variety of materials urgently needed in high-tech fields such as aviation, aerospace and new weapons for national defense. According to the different alumina content, our product models are divided into: AF17, AF18 and AF19.
01 Excellent high and low temperature resistance
α- The service temperature of Al2O3 ,fibre is up to 1600℃, and that of mullite fibre is up to 1400℃; After treatment with liquid nitrogen (- 196℃) for 24 hours, the strength did not decrease.
02 Acid and alkali resistance
Retention rate of fibre strength after soaking in 10% alkaline solution for 24 hours: NaOH -- 40%; KOH--65%; NH4OH--95%; Retention rate of fibre strength after soaking in 10% acid solution for 24 hours: HCl -- 96%; H2SO4--95%; HNO3--96%; H3PO4--95%.
03 Good thermal insulation performance
The device made of alumina continuous fibre has a hot surface temperature of 800 ℃ and a cold surface temperature of 278 ℃; When the hot surface temperature is 1000 ℃, the cold surface temperature is 388 ℃.
04 Excellent electrical properties and electrical insulation
The resistance of alumina fibre decreases with the increase of temperature. Above 600℃, the resistance tends to be constant, The dielectric constant and dielectric loss of alumina fibre are basically stable at high temperature and are suitable for high temperature wave transmission materials.
05 Excellent flexibility
At room temperature, alumina fibre can be bent 1400 times, After high temperature treatment at 1000 ℃, it can still be bent for 60 times.
06 Strong design
By adjusting chemical composition and heat treatment process, products with different properties can be obtained to meet different application needs.
Performance | AF17 | AF18 | AF19 |
Chemical composition (wt.%) | 72 Al2O3+28 SiO2 | 85 Al2O3+15 SiO2 | ≥99 Al2O3 |
Crystalline phase | γ-Al2O3+Amorphous | α-Al2O3+Mullite | α-Al2O3+Mullite |
Monofilament diameter(μm) | 9-12 | 11-14 | 11-14 |
Density(g/m3) | 3.0 | 3.4 | 3.9 |
Tex(g/km) | 200±20 | 167±10 | 167±10 |
Moofilament strength(MPa) | 2000 | 2000 | 3000 |
Monofilament tensile modulus(GPa) | 170 | 240 | 330 |
AF17 Fibre
The fibre is microcrystalline polycrystalline(γ-Al2O3), diameter 9-12μm. The tensile strength at room temperature can reach more than 2.0GPa, and the service temperature is more than 1200℃. It has good high temperature resistance and creep resistance.
AF18 Fibre
The fibre is in micro crystalline state( α- Al2O3+ mullite), diameter 11-14μm. The tensile strength at room temperature can reach more than 2.0GPa, and the service temperature is more than 1300℃. At present, alumina fibre has the best creep resistance. Below 1100℃, the strength is basically unchanged. At 1200℃, more than 90% of the room temperature strength is retained, and at 1300℃, more than 80% of the room temperature strength is retained.
AF19Fiber
The fibre is in micro crystalline state( α- Al2O3), diameter 11-14 μm. The tensile strength at room temperature can reach more than 3.0Gpa, and the service temperature is more than 1000℃. High strength at room temperature, good mechanical properties, can be used as composite reinforcement, but poor creep resistance at high temperature.
Aerospace
■ Alumina continuous fibre can be used in hypersonic aircraft, radomes and radar radomes. It has become a trend to use alumina continuous fibre as a new generation material with higher temperature requirements. European and American countries have applied this material to space shuttles, starships and weapons and equipment, which can play a good role in temperature resistance and heat insulation.
■ Alumina continuous fibre ceramic matrix composites have excellent high-temperature strength, which can be used in rocket motor combustion chamber insulation layer, nozzle outlet cone and other related parts, and it is also an ideal material for thermal structure insulation connection between nozzle and combustion chamber of solid motor. In addition, it can also be used for hot end components of aviation turbojet engine.
■ Aluminum oxide continuous fibre reinforced metal matrix composites are used for mechanical parts bearing high load and high-temperature and high-speed rotating parts such as transmission devices of helicopters; It can also be used in solid rocket motor nozzle.
■ Alumina continuous fibre reinforced light alloy can be used in the military industry. For example, the reinforced aluminum matrix composite is an ideal material for the pistons of armored vehicles and tank engines. The U.S. Army uses continuous alumina fibre reinforced composite to manufacture tank track shoes, reducing the weight from 544kg of cast steel to 272-363kg; It can also be made into a solid motor shell for air launched missiles. Its bursting pressure is the same as that of steel, and its mass is 11% lighter than that of aluminum alloy.
Industrial sector
■ ACCR composite core wire: aluminum oxide continuous fibre (af19) is embedded in aluminum alloy wire, and its mechanical and electrical properties far exceed that of steel core. ACCR composite core can reach 8 times of the breaking strength of the same aluminum wire, and its weight is only 1/2 of that of the same volume steel core; The conductivity is much higher than that of the steel core, and the linear expansion rate is less than 1/2 of that of the steel core.
Consumer electronics
■ 5G communication field: AF19 alumina continuous fibre has unique characteristics of heat conduction, insulation and wave transmission, and can be used to make mobile phone backplane materials. It has unique value for the application demand of ultra-low delay of 5g smart phone signals in the future, and can effectively solve the problem of temperature rise in wireless area and signal dilemma.
Environmental protection
■ High temperature thermal insulation material: the braidability of the fibre makes it applicable to the thermal insulation parts and three-dimensional braided parts that need to be connected; It can also be used as lining insulation material in metallurgical furnace, ceramic sintering furnace or other high-temperature furnaces. With low density, good insulation and small heat capacity, it can not only reduce the furnace body weight, but also improve the temperature control accuracy, with remarkable energy-saving effect.
■ Chemical corrosion resistant materials: with its excellent corrosion resistance, alumina continuous fibre can effectively meet the high-temperature filtration in pressurized fluidized bed combustion combined cycle (pfbcc) and integrated coal gasification combined cycle (IGCC) power generation technology.
航空航天领域
■ 氧化铝连续纤维可用于高超音速飞行器、天线罩、雷达透波罩,将氧化铝连续纤维作为对温度要求更高的新一代材料使用,已经成为一种趋势,欧美国家已经把该材料运用到航天飞机、星际飞船及武器装备上,可起到良好的耐温隔热作用。
■ 氧化铝连续纤维陶瓷基复合材料具有优异的高温强度,可用于火箭发动机燃烧室隔热层、喷管出口锥等相关部件,更是固体发动机喷管和燃烧室之间的热结构绝热连接件的理想材料。此外,还可用于航空涡喷发动机热端部件。
■ 氧化铝连续纤维增强金属基复合材料可用于承受高负荷的机械零件和高温高速旋转零件,如直升飞机的传动装置等。还可用于固体火箭发动机喷管。
■ 氧化铝连续纤维增强轻合金复合材料可用于军工领域,如增强铝基复合材料是装甲车、坦克发动机活塞的理想材料。美国陆军采用氧化铝连续纤维增强复合材料制造坦克履带板,使重量从铸钢的544Kg降至272-363Kg,还可制成空射导弹用固体发动机壳体,其爆破压强和钢材相同,质量则比铝合金轻11%。
工业领域
■ ACCR复合芯导线:将氧化铝连续纤维(AF19)嵌入铝合金导线,机械和电气性能远超过钢芯。ACCR复合芯可达8倍同样铝线的拉断强度,重量仅为同体积钢芯的1/2,线膨胀率小于钢芯的1/2,电导率远远超过钢芯。
■ 耐高温部件:用氧化铝连续纤维编织的套管具有高温阻燃、柔韧性好、弹性大、易加工、绝缘好等多重特性,在1200℃及以上高温下均有很好的强度,被广泛用于线缆防火。
电子消费品领域
■ 5G通信领域:AF19型氧化铝连续纤维具有独特的导热、绝缘、透波特性,可用于制作手机背板材料,对未来5G智能手机信号超低延迟的应用需求有着独特价值,可有效解决一直以来无线区域温升、信号两难全的难题。
环保领域
■ 高温隔热材料:氧化铝连续纤维的可编织性使其可用于特殊连接的隔热部位及三维编织部件,也可用于冶金炉、陶瓷烧结炉或其它高温炉中作衬里隔热材料。其密度小、绝热性好、热容量小,不仅可减轻炉体质量,且可提高控温精度,节能效果显著。
■ 耐化学腐蚀材料:氧化铝连续纤维凭借其优良的抗腐蚀性能,可有效满足增压流化床燃烧联合循环(PFBCC)和整体式煤气化联合循环(IGCC)发电技术中的高温过滤。
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