Progressive Decarburization of Nitride Fibers
A nitride and progressive technology, applied in the chemical characteristics of fibers, textiles and papermaking, etc., can solve the problems of affecting the mechanical properties of fibers, fiber nano-scale damage, and low utilization of ammonia gas, so as to improve mechanical properties and use ammonia gas The effect of small amount and improved mechanical strength
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Embodiment 1
[0024] (1) Put 100 grams of polysilazane fiber samples in a high-temperature graphite furnace with a fiber filament diameter of 15 microns, vacuumize and replace high-purity nitrogen, and repeat twice; (2) From The room temperature is raised to 300°C, and high-purity ammonia gas is introduced at a flow rate of 5L / min, the pressure in the furnace is maintained at 0.2MPa, and the temperature is raised to 650°C at 1°C / min, and a total of 1250L of high-purity ammonia gas is introduced; (3 ) Continue to heat up to 650°C at a heating rate of 1°C / min, stop feeding ammonia, and feed high-purity nitrogen at a flow rate of 10L / min, and heat up to 950°C at 1°C / min; 4) Continue at 5°C / min Raise the temperature to 1200°C and keep it warm for 2 hours to obtain silicon nitride ceramic fibers. The super depth-of-field microscope photos of the fibers show that the nitride fibers are smooth and compact. The X-ray energy spectrometer analyzes the carbon content of the fibers to be 0.22wt%, and th...
Embodiment 2
[0028] (1) Put 100 grams of polyborazane fiber samples in a high-temperature graphite furnace with a single fiber diameter of 12 microns, vacuumize and replace high-purity nitrogen, and repeat twice; (2) From The room temperature was raised to 450°C, and high-purity ammonia gas was introduced at a flow rate of 10L / min, the pressure in the furnace was kept at 0.3MPa, and the temperature was continued to rise to 650°C at 1°C / min, and a total of 1000L of high-purity ammonia gas was introduced; (3 ) stop feeding ammonia at 650°C, feed high-purity nitrogen at a flow rate of 5L / min, and raise the temperature to 950°C at a rate of 0.2°C / min; The boron nitride ceramic fiber can be obtained, the carbon content is 0.25wt%, the single filament strength is 1.75GPa, and the elastic modulus is 156GPa.
Embodiment 3
[0030] (1) Put 100 grams of polyborosilazane fiber samples in a high-temperature graphite furnace with a single fiber diameter of 13 microns, vacuumize and replace high-purity nitrogen, and repeat twice; (2) According to the heating rate of 1°C / min Raise the temperature from room temperature to 400°C, start feeding high-purity ammonia gas at a flow rate of 10L / min, keep the pressure in the furnace at 0.4MPa, continue to raise the temperature to 650°C at 0.5°C / min, and feed a total of 2500L of high-purity ammonia gas; ( 3) Stop feeding ammonia gas at 650°C, feed high-purity nitrogen gas at a flow rate of 5L / min, and raise the temperature to 950°C at 0.5°C / min; 4) Continue to raise the temperature to 1400°C at 8°C / min, and keep it warm for 1 hour, The SiBN ceramic fiber can be obtained, the carbon content is 0.28wt%, the monofilament strength is 1.80GPa, and the elastic modulus is 165GPa.
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