A rice husk-based porous silicon carbide ceramic material and its preparation method
A technology of silicon carbide ceramics and porous silicon carbide, which is applied in the field of ceramic materials, can solve problems such as complex technical conditions, pore size distribution, mechanical strength, silicon carbide microstructure and morphology, and limited practical application range, and achieve simple and easy control of the process, The effect of reduced preparation cost, broad development space and application prospect
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Embodiment 1
[0033] The rice husk-based porous silicon carbide ceramic material of the present embodiment is prepared from rice husks, water and a mixture, and the quality of the mixture is 40% of the quality of the rice husk; the mixture is composed of the following components by mass percentage: Silicon powder 26%, graphite 37%, NaCl 6%, dextrin powder 31%; the raw materials are taken according to the proportion and mixed in a ball mill mixer for 1 hour to obtain a mixture.
[0034] The preparation method of the rice husk-based porous silicon carbide ceramic material of the present embodiment adopts the following steps:
[0035] 1) Add the rice husk powder into the mixer, add 45% of the water by weight of the rice husk powder, and stir to fully wet the rice husk powder; then add the mixture, and stir for 5 minutes to make a billet;
[0036] 2) The blank is machine-pressed under low pressure, the molding pressure is 1 MPa, and the pressure holding time is 20 s to obtain a blank; the blank...
Embodiment 2
[0038] The rice husk-based porous silicon carbide ceramic material of the present embodiment is prepared from rice husks, water and a mixture, and the quality of the mixture is 65% of the quality of the rice husk; the mixture is composed of the following components by mass percentage: Silicon powder 2%, carbon black 40%, Fe3%, Fe 2 O 3 5%, dextrin powder 28%, gelatin 22%; take the raw materials according to the proportion and mix them in a ball mill mixer for 1 hour to obtain a mixture.
[0039]The preparation method of the rice husk-based porous silicon carbide ceramic material of the present embodiment adopts the following steps:
[0040] 1) Add the rice husk powder into the mixer, add 57% of the water by weight of the rice husk powder, and stir to fully wet the rice husk powder; then add the mixture, and stir for 5 minutes to make a billet;
[0041] 2) The blank is machine-pressed under low pressure, the molding pressure is 3 MPa, and the pressure holding time is 10 s to...
Embodiment 3
[0043] The rice husk-based porous silicon carbide ceramic material of the present embodiment is prepared from rice husks, water and a mixture, and the quality of the mixture is 50% of the quality of the rice husk; the mixture is composed of the following components by mass percentage: 3% of silicon powder, 25% of anthracite, 8% of graphene, 6% of NaCl, 45% of pulp powder, 13% of polyvinyl butyral; take the raw materials according to the proportion and mix them in a ball mill mixer for 1 hour to obtain a mixture.
[0044] The preparation method of the rice husk-based porous silicon carbide ceramic material of the present embodiment adopts the following steps:
[0045] 1) Add the rice husk powder into the mixer, add 55% of the water by weight of the rice husk powder, and stir to fully wet the rice husk powder; then add the mixture, and stir for 5 minutes to make a billet;
[0046] 2) The blank is machine-pressed under low pressure, the molding pressure is 2 MPa, and the pressure...
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