(HfTaZrTiNb) C high-entropy ceramic powder and preparation methods of high-entropy ceramic powder and high-entropy ceramic blocks
A technology of ceramic powder and ceramic powder, which is applied in the field of preparation of high-entropy compound materials, can solve problems such as the inability to realize the preparation of bulk ceramics and limit the application of high-entropy carbide ceramics, and achieve the effect of fine grain size and lower sintering temperature
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[0026] Example 1:
[0027] A method for preparing (HfTaZrTiNb)C high-entropy bulk ceramic powder, the specific steps and process parameters are as follows:
[0028] Step 1. Preparation of amorphous ceramic powder: weigh the five powders of TaC, HaC, NbC, TiC, and ZrC in equal molar ratios in a glove box filled with argon, add a small amount of stearic acid, and put the powder into In the cemented carbide tank, the selected ball-to-material ratio is 9:1, the rotation speed is 550r / min, and the ball milling is 1 hour intermittently for 5 minutes for a total of 8 hours to obtain an amorphous ceramic mixture with uniform composition;
[0029] Step 2. Preparation of high-entropy ceramic powder: heat the ceramic powder obtained in step 1 at 1400° C. for 6 hours to obtain (HfTaZrTiNb)C crystalline high-entropy ceramic powder.
Example Embodiment
[0030] Example 2:
[0031] The amorphous ceramic powder in Example 1 was prepared into a high-entropy ceramic block: the amorphous ceramic powder was put into a graphite mold in a glove box, and the graphite mold was sealed, and then the mold was placed in a discharge Sintering is performed in a plasma furnace to obtain (HfTaZrTiNb)C bulk ceramics.
Example Embodiment
[0032] Example 3:
[0033] The high-entropy ceramic powder obtained in step 2 in Example 1 was prepared into a high-entropy ceramic block: the high-entropy ceramic powder was put into a graphite mold in a glove box, and the graphite mold was sealed, and then the mold was placed Sintering is performed in a spark plasma furnace to obtain (HfTaZrTiNb) C bulk ceramics.
[0034] The sintering process of Example 2 and Example 3 is as follows:
[0035] Sintering equipment: spark plasma sintering furnace
[0036] Heating method: AC pulse current
[0037] Sintering temperature: 1700℃
[0038] Sintering time: 7min
[0039] Sintering pressure: 30MPa
[0040] Heating rate: 75℃ / min
[0041] The average grain size of the sintered (HfTaZrTiNb)C high-entropy ceramic is 5um, the mass gain after 10h oxidation is 13%, and the KIC is 4.5MPa.m 1 / 2 Compared with the performance of ceramics prepared from five raw material powders, the oxidation resistance and KIC of (HfTaZrTiNb)C high-entropy ceramics have been ...
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