High-entropy disilicide and preparation method thereof
A disilicide, high-entropy technology, applied in the field of high-temperature materials, can solve problems such as high-entropy silicides that have not yet been seen, and achieve the effects of excellent mechanical properties, strong controllability, and simple preparation process
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Embodiment 1
[0023] A kind of preparation method of high entropy disilicide:
[0024] Raw material powder (1-50 μm, 99wt%) of Ti, Zr, Nb, Mo, W and Si powder (1-45 μm, 99.5wt%) are mixed in a molar ratio of 1:1:1:1:1:2. With ethanol as the medium, Si 3 N 4 The ball is a grinding ball, and the ball mill is mixed at a speed of 560 rpm for 12 hours on a planetary ball mill, and then the dry mixed powder is obtained by rotary evaporation; the obtained mixed powder is put into a graphite mold, and then placed in a discharge plasma sintering furnace, In a vacuum with an air pressure lower than 10Pa, under the sintering conditions of 1320°C and 30MPa, hold the heat for 15min to obtain (Ti 0.2 Zr 0.2 Nb 0.2 Mo 0.2 W 0.2 ) Si 2 High entropy disilicides.
[0025] After analysis: the density of the prepared material reaches 99.2%, and its XRD pattern is as follows: figure 1 shown. It can be seen that the prepared material is a single-phase material, which only contains hexagonal structure (...
Embodiment 2
[0027] A kind of preparation method of high entropy disilicide:
[0028] Raw material powders (1-50 μm, 99wt%) of Ti, Zr, Nb, Mo, Hf and Si powder (1-45 μm, 99.5wt%) are mixed in a molar ratio of 1:1:1:1:1:2. With acetone as the medium, Si 3 N 4The ball is a grinding ball, and the ball milling is carried out on a planetary ball mill at a speed of 500 rpm for 18 hours, and then the mixed dry powder is obtained by rotary evaporation; the obtained mixed dry powder is put into a graphite mold, and then placed in a discharge plasma sintering furnace. In a vacuum lower than 10 Pa, under the sintering conditions of 1250 ° C and 50 MPa, the temperature was kept for 25 minutes to obtain (Ti 0.2 Zr 0.2 Nb 0.2 Mo 0.2 f 0.2 ) Si 2 High-entropy disilicides;
[0029] After analysis: the density of the prepared material reaches 99%, and the SEM morphology of the polished surface and the distribution of related EDS elements are as follows: figure 2 As shown, it can be seen that the ...
Embodiment 3
[0031] A kind of preparation method of high entropy disilicide:
[0032] Raw material powders (1-50 μm, 99 wt%) of Ti, Zr, Mo, Hf, W and Si powder (1-45 μm, 99.5 wt%) are mixed in a molar ratio of 1:1:1:1:1:2. With ethanol as the medium, Si 3 N 4 The ball is a grinding ball, and the ball mill is mixed at a speed of 580 rpm on a planetary ball mill for 10 hours, and then the mixed dry powder is obtained by rotary evaporation; the obtained mixed dry powder is put into a graphite mold, and then placed in a discharge plasma sintering furnace, in an inert (Ti 0.2 Zr 0.2 Mo 0.2 f 0.2 W 0.2 ) Si 2 High-entropy disilicides;
[0033] After analysis: the density of the prepared material reaches 98%, and the SEM morphology of the fracture is as follows: image 3 As shown, it can be seen that the microstructure of the obtained material is uniform, and the average grain size is about 8 μm.
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