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    • 25. 发明授权
    • Method for producing high strength, melt spun carbon fibers
    • 生产高强度熔融纺丝碳纤维的方法
    • US5156831A
    • 1992-10-20
    • US34226
    • 1987-04-02
    • Charles C. FainDanny D. Edie
    • Charles C. FainDanny D. Edie
    • D01D5/253D01F9/14D01F9/155D01F9/22D01F9/32
    • D01F9/32D01D5/253D01F9/14D01F9/155D01F9/22D01F9/322
    • Hollow carbon fibers and carbon fibers having a generally C-shaped transverse cross-sectional area are produced by extruding a carbonaceous anisotropic liquid precursor through a spinneret having a capillary with a generally C-shaped cross-sectional area, into a fiber filament, controlling the viscosity of the molten precursor, the pressure of the molten precursor and the linear take-up speed of the filament to yield a fiber filament having a cross-sectional area shaped substantially like the shape of the cross-sectional area of the capillary and further having a line-origin microstructure, rendering the filament infusible, heating the filament in an inert pre-carbonizing environment at a temperature in the range of 600.degree. C. to 1000.degree. C. for 1 to 5 minutes, and heating the filament in an inert carbonizing environment at a temperature in the range of 1550.degree. C. to 1600.degree. C. for 5 to 10 minutes, to substantially increase the tensile strength of the filament. The carbon fiber filament so produced has a line-origin microstructure in which the origin line is located and shaped substantially as a line which constitutes the line formed by uniformly collapsing the perimeter of the transverse cross-sectional area of the fiber filament upon itself. The carbon fiber filament has a tensile strength greater than 200 ksi and as high as the 700 to 800 ksi range, yet a modulus of elasticity on the order of 25-35 msi. The top to bottom outside diameter of the fiber's transverse cross-sectional area is on the order of 30 to 50 microns, and the wall thicknesses are on the order of 8 to 15 microns.
    • 通过将碳质各向异性液体前体通过具有大致C形横截面积的毛细管的喷丝头挤出到纤维丝中来制造具有大致C形横截面积的中空碳纤维和碳纤维,从而控制 熔融前体的粘度,熔融前体的压力和丝的线性吸收速度,以产生纤维长丝,该纤维长丝的截面积基本上类似于毛细管的横截面积的形状,并且还具有 线源微结构,使细丝不熔,在惰性预碳化环境中在600℃至1000℃的温度范围内加热丝,持续1至5分钟,并将惰性物质加热至惰性 碳化环境在1550℃至1600℃的温度下进行5至10分钟,以显着提高长丝的拉伸强度。 如此制造的碳纤维丝具有线状微结构,其中原点线基本上定位成线,该线构成通过将纤维丝的横截面积的周长均匀地折叠在其自身上而形成的线。 碳纤维长丝的拉伸强度大于200ksi,高达700至800ksi的范围,弹性模量为25-35毫秒。 纤维横向横截面积的顶部到底部的外径约为30至50微米,壁厚约为8至15微米。