Nano laminated Ta2AlC ceramic powder and preparing method thereof
A nano-layered and ceramic powder technology, which is applied in the preparation of nano-layered Ta2AlC ceramic powder and its preparation field by in-situ reaction synthesis technology, to achieve the effects of high-purity particle size, low cost, and small particle size
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Embodiment 1
[0022] With 108.56 grams of tantalum powder, 9.72 grams of aluminum powder, and 3.24 grams of graphite powder as raw materials (the molar ratio is 2:1.2:0.9, the particle size of the raw material powder is 200 mesh), ball milling in a resin tank under dry conditions for 20 hours, after sieving Put it into a graphite mold for cold pressing (20MPa), heat treatment in a graphite furnace with argon gas, the heating rate is 10°C / min, and the heat treatment time is 60 minutes at 1520°C. After the sample is cooled in the furnace, the surface impurities, Grinding and crushing and passing through a 200-mesh sieve to obtain a powder. According to X-ray diffraction analysis, the main crystal phase is Ta 2 AlC, containing a small amount of impurity as Ta 4 AlC 3 (less than 1.5 wt.%). Determination of nanolayered Ta 2 The particle size range of AlC ceramic powder is 1.5-33μm, the weight average diameter is 11.78μm, and the specific surface area is 60.59m 2 / kg.
Embodiment 2
[0024] The difference from Example 1 lies in that the molar ratio of raw material powder is different, the heating rate is different, and the heat treatment temperature and time are different.
[0025] With 130.28 grams of tantalum powder, 10.69 grams of aluminum powder, and 4.32 grams of graphite powder as raw materials (the molar ratio is 2:1.1:1, and the particle size of the raw material powder is 200 mesh), ball milling in a resin tank under dry conditions for 16 hours, after sieving Put it into a graphite mold for cold pressing (20MPa), heat treatment in a graphite furnace with argon gas, the heating rate is 15°C / min, and the heat treatment time is 30 minutes at 1600°C. After cooling in the furnace, the sample is ground to remove surface impurities , grinding and crushing and passing through a 200-mesh sieve to obtain powder. According to X-ray diffraction analysis, the main crystal phase is Ta 2 AlC, with a small amount of impurity Ta 4 AlC 3 (less than 2wt.%). Deter...
Embodiment 3
[0027] The difference from Example 1 is that the molar ratio of raw material powder is different, and the heat treatment temperature and time are different.
[0028] With 119.42 grams of tantalum powder, 10.69 grams of aluminum powder, and 3.96 grams of graphite powder as raw materials (the molar ratio is 2:1.2:1, and the particle size of the raw material powder is 200 mesh), ball milling in a resin tank under dry conditions for 12 hours, after sieving Put it into a graphite mold for cold pressing (5MPa), heat treatment in a graphite furnace with argon gas, the heating rate is 10°C / min, and the heat treatment time is 20 minutes at 1650°C. After cooling in the furnace, the sample is ground to remove surface impurities , grinding and crushing and passing through a 200-mesh sieve to obtain powder. According to X-ray diffraction analysis, the main crystal phase is Ta 2AlC, with a small amount of Ta 4 AlC 3 (less than 1.5 wt.%). Determination of nanolayered Ta 2 The particle s...
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