A high-entropy carbide ultra-high temperature ceramic with ultra-high porosity and its preparation method
A technology of ultra-high temperature ceramics and carbides, which is applied to ceramic products, other household appliances, household appliances, etc., which can solve the problems of high thermal conductivity and achieve the effects of uniform composition, stable mechanical properties, and convenient operation
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Embodiment 1
[0028] In this embodiment, the high-entropy carbide ultra-high temperature ceramic with ultra-high porosity and its preparation method are as follows:
[0029] Weigh 7.93 g ZrC, 14.62 g HfC, 8.05 g NbC, 14.81 g TaC and 4.60 g TiC powders and pour into Si 3 N 4 In the ball milling tank, add 30 ml of absolute ethanol and carry out ball milling, wherein the mass ratio of balls to materials is 4:1, use a planetary ball mill to mill at a speed of 350 rpm for 12 h, and dry the uniformly mixed suspension in an oven at 90 °C. The final powder is passed through a 200-mesh sieve to obtain a uniform mixture powder.
[0030] Put the ball-milled mixture powder, 30 g deionized water, 0.5 g dispersant ammonium citrate, and 1 g sintering aid graphite into the beaker and keep stirring for 2 h to form a slurry; add 0.3 g of foaming agent sodium dodecyl sulfonate, stirred rapidly for 15 min to foam, then added 1.8 g of gelatin gelatin, stirred for 10 min, injected into the mold, then freeze-dr...
Embodiment 2
[0034] In this embodiment, the high-entropy carbide ultra-high temperature ceramic with ultra-high porosity and its preparation method are as follows:
[0035] Weigh 13.7 g ZrC, 12.6 g HfC, 20.9 g NbC, 38.5 g TaC and 4.2 g VC powder, pour into Si 3 N 4 In the ball mill tank, add 35 ml of absolute ethanol and carry out ball milling, wherein the mass ratio of balls to materials is 3:1, and use a planetary ball mill to mill at a speed of 260 rpm for 28 h, and dry the evenly mixed suspension in an oven at 60 °C. The final powder is passed through a 200-mesh sieve to obtain a uniform mixture powder.
[0036] Add the mixture powder after ball milling, 45 g deionized water, 5.4 g dispersant polyethyleneimine, and 0.5 g aluminum nitride into the beaker and stir continuously, and form a slurry after stirring for 1 h; add 4.5 g to the obtained slurry g of foaming agent sodium lauryl sulfate, stirred rapidly for 25 minutes to foam, then added 4.5 g of gelling agent gelatin, stirred for...
Embodiment 3
[0040] In this embodiment, the high-entropy carbide ultra-high temperature ceramic with ultra-high porosity and its preparation method are as follows:
[0041] Weigh 4.1 g ZrC, 15.1 g HfC, 4.2 g NbC, 23.0 g TaC and 23.4 g WC powders and pour into Si 3 N 4 In the ball milling tank, add 40 ml of absolute ethanol and then carry out ball milling, wherein the mass ratio of balls to materials is 6:1, use a planetary ball mill at a speed of 310 rpm for 20 h, and dry the uniformly mixed suspension in an oven at 75 °C. After drying, The powder is passed through a 200-mesh sieve to obtain a uniform mixture powder.
[0042] The mixture powder after ball milling, 30 g of deionized water, 2.5 g of dispersant polyethyleneimine, and 0.7 g of silicon molybdenum were added to the beaker and stirred continuously, and a slurry was formed after stirring for 4 h; Foaming agent sodium dodecyl sulfonate, stirred rapidly for 30 minutes for foaming, then added 0.6 g of gelatin gelatin, stirred for 1...
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Abstract
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