Ultra-high temperature zrsi/zrc composite nanofiber and its preparation method
A composite nanofiber and ultra-high temperature technology, applied in fiber processing, fiber chemical characteristics, filament/wire forming, etc., can solve the problems of high raw material cost, coarse carbide particles, high energy consumption, etc., and achieve cheap raw materials and reduce Energy consumption and cost saving effects
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example 1
[0031] 97wt% zirconium silicate powder and 3wt% carbon powder were mixed, press-molded, and sintered at 950° C. for 4 hours under an inert atmosphere such as nitrogen or argon to obtain a sintered product.
[0032] The sintered product is made into a cathode, graphite is used as an anode, and connected to a constant voltage power supply; CaCl with a mass ratio of 7:3 2 -NaCl mixed salt is used as a molten salt medium to form an electrolysis system.
[0033] Under an inert atmosphere, in a molten salt at 850° C., a 2.8V constant voltage was used for 20 hours to obtain an electrolysis product.
[0034] The electrolysis product was cleaned, followed by XRD, SEM, TEM and SAED detection.
[0035] Such as figure 1 As shown, the electrolysis product of this example is composed of ZrSi and ZrC.
[0036] Depend on figure 2 It can be seen that the electrolysis product in this example is mainly composed of nanofibers with uneven thickness, and the diameter of the fibers is about 100...
example 2
[0045] 94wt% zirconium silicate powder and 6wt% carbon powder were mixed, press-molded, and sintered at 1050° C. for 5 hours under an inert atmosphere such as nitrogen or argon to obtain a sintered product.
[0046] The sintered product is made into a cathode, graphite is used as an anode, and connected to a constant voltage power supply; CaCl with a mass ratio of 7:3 2 -NaCl mixed salt is used as a molten salt medium to form an electrolysis system.
[0047] Under an inert atmosphere, in a molten salt at 885° C., 2.82 V constant voltage was used for 20 h to obtain an electrolysis product. Subsequently, the electrolyzed product was washed several times with ethanol and deionized water to obtain the sample to be tested.
[0048] After testing, the sample to be tested is composed of zirconium silicide with a columnar core and tubular zirconium carbide coated on the zirconium silicide, and its fiber diameter is in the range of about 120-370 nm.
example 3
[0050] 95wt% zirconium silicate powder and 5wt% carbon powder were mixed, press-molded, and sintered at 9000° C. for 8 hours under an inert atmosphere such as nitrogen or argon to obtain a sintered product.
[0051] The sintered product is made into a cathode, graphite is used as an anode, and connected to a constant voltage power supply; CaCl with a mass ratio of 7:3 2 -NaCl mixed salt is used as a molten salt medium to form an electrolysis system.
[0052] Under an inert atmosphere, in a molten salt at 820° C., a constant voltage of 2.84 V was used for electrolysis for 19 hours to obtain an electrolysis product. Subsequently, the electrolyzed product was washed several times with ethanol and deionized water to obtain the sample to be tested.
[0053] After testing, the sample to be tested is composed of zirconium silicide with a columnar core and tubular zirconium carbide coated on the zirconium silicide, and the diameter of its fiber is in the range of about 110-360 nm.
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