Silicon nitride porous ceramic and preparation method thereof
A technology of porous ceramics and silicon nitride, applied in the field of ceramics, can solve the problems of poor corrosion resistance and heat resistance, complex preparation process, and low bending strength of ceramics, achieve low raw material cost, simple process, and improve corrosion resistance Effect
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[0038] Example 1 Preparation and Properties of Silicon Nitride Porous Ceramics
[0039] Rice husk pretreatment: soak and boil the rice husk with 10% hydrochloric acid solution, dry it, put it in a saggar, carbonize for 2 hours at 540 °C, and grind it for 1 hour to make C / SiO 2 It is a carbon-silicon precursor with a median particle size of 1.3 and a median particle size of less than 2.0 μm;
[0040] Mixing: mix the raw materials (including 87% carbon silicon precursor, 5% α-silicon nitride powder, 3% Fe 2 O 3 and 5%Y 2 O 3 ) is placed in a ball-milling tank, add ethanol with a weight of 1.5 times the total weight of the above-mentioned raw materials for ball-milling mixing, add 5% (weight ratio) polyvinyl alcohol solution after drying, grind and granulate, and pass through a 120-mesh sieve to obtain a mixture;
[0041] Forming: molding the mixture under 5MPa to obtain a green body;
[0042] Firing: After drying the green body, put it into a graphite tank coated with boro...
Example Embodiment
[0044] Example 2 Preparation and Properties of Silicon Nitride Porous Ceramics
[0045] Rice husk pretreatment: soaked and boiled rice husks with a volume fraction of 10% hydrochloric acid solution, dried and put into a sagger, carbonized for 1 h at 540 °C, and ground for 1 h to make C / SiO 2 It is a carbon-silicon precursor with a median particle size of 1.5 and a median particle size of less than 2.0 μm;
[0046] Mixing: mix the raw materials (including 79% carbon silicon precursor, 8% α-silicon nitride powder, 8% NaF and 5% CeO 2) is placed in a ball-milling tank, add ethanol with a weight of 1.5 times the total weight of the above-mentioned raw materials for ball-milling mixing, add 5% (weight ratio) polyvinyl alcohol solution after drying, grind and granulate, and pass through a 120-mesh sieve to obtain a mixture;
[0047] Molding: molding the mixture under 3MPa to obtain a green body;
[0048] Firing: After drying the green body, put it into a graphite tank coated wit...
Example Embodiment
[0050] Example 3 Preparation and Properties of Silicon Nitride Porous Ceramics
[0051] Rice husk pretreatment: soaked and boiled rice husks with a volume fraction of 10% hydrochloric acid solution, dried and put into a sagger, carbonized for 1 h at 540 °C, and ground for 1 h to make C / SiO 2 It is a carbon-silicon precursor with a median particle size of 1.5 and a median particle size of less than 2.0 μm;
[0052] Mixing: mix the raw materials (including 76% carbon-silicon precursor, 8% α-silicon nitride powder, 10% NaF, 3% Al 2 O 3 and 3% MgO) in a ball milling tank, add ethanol with a weight of 1.5 times the total weight of the above-mentioned raw materials for ball milling and mixing, add 5% (weight ratio) polyvinyl alcohol solution after drying, grind and granulate, pass through a 120 mesh sieve, get the mixture;
[0053] Molding: molding the mixture under 10MPa to obtain a green body;
[0054] Firing: After drying the green body, put it into a graphite tank coated w...
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