Silicon nitride ceramic powder capable of realizing rapid sinter molding as well as preparation method thereof
A technology of silicon nitride ceramic powder and rapid sintering
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[0016] The invention provides a method for preparing silicon nitride ceramic powder capable of rapid sintering, comprising:
[0017] S1. Dissolving 10-15 parts by weight of yttrium alkoxide and 5-8 parts by weight of aluminum alkoxide in 200-250 parts by weight of alcohol solvent to form a sol.
[0018] S2. Add 95-110 parts by weight of α-silicon nitride and 5-8 parts by weight of β-silicon nitride to the sol during stirring, add ammonia water dropwise to adjust the pH value to 9-10, heat to 60-80°C and seal 4 -8h, a gel was formed.
[0019] S3. Calcining and drying the gel to obtain surface-modified silicon nitride.
[0020] S4. Mixing surface-modified silicon nitride with 5-8 parts by weight of boron nitride nanotubes and 8-12 parts by weight of silicon carbide whiskers to obtain silicon nitride ceramic powder capable of rapid sintering.
[0021] In the above method, a composite system of α-silicon nitride and β-silicon nitride is used for sintering, and β-silicon nitride ...
Embodiment 1
[0041] A method for preparing silicon nitride ceramic powder capable of rapid sintering, comprising:
[0042]S1. Dissolving 12kg of yttrium alkoxide and 6kg of aluminum alkoxide in 220kg of alcohol solvent to form a sol. Wherein the yttrium alkoxide is ethoxide, the aluminum alkoxide is ethoxide, and the alcohol solvent is absolute ethanol.
[0043] S2. Add 105 kg of α-silicon nitride and 6 kg of β-silicon nitride to the sol while stirring, add 3 kg of triethylenetetramine and mix evenly, add ammonia water dropwise to adjust the pH to 9-10, heat to 60-80°C and seal for 6 hours , forming a gel.
[0044] S3. Calcining and drying the gel at a temperature of 400-500° C. to obtain surface-modified silicon nitride.
[0045] S4. Disperse surface-modified silicon nitride, 6kg boron nitride nanotubes and 10kg silicon carbide whiskers in ethanol, stir at a speed of 500r / min for 1.5h, and then dry at a temperature of 120-150°C until The content of the organic solvent is not higher tha...
Embodiment 2
[0047] A method for preparing silicon nitride ceramic powder capable of rapid sintering, comprising:
[0048] S1. Dissolving 10kg of yttrium alkoxide and 8kg of aluminum alkoxide in 200kg of alcohol solvent to form a sol. Wherein the yttrium alkoxide is ethoxide, the aluminum alkoxide is isopropoxide, and the alcohol solvent is absolute ethanol and isopropanol with a mass ratio of 1:1.
[0049] S2. Add 95 kg of α-silicon nitride and 5 kg of β-silicon nitride to the sol while stirring, add 2 kg of triethylenetetramine and mix well, add ammonia water dropwise to adjust the pH to 9-10, heat to 60-80°C and seal for 4 hours , forming a gel.
[0050] S3. Calcining and drying the gel at a temperature of 400-500° C. to obtain surface-modified silicon nitride.
[0051] S4. Disperse surface-modified silicon nitride, 5kg boron nitride nanotubes and 8kg silicon carbide whiskers in ethanol, stir for 2h at a speed of 400r / min, and then dry at a temperature of 120-150°C until organic The ...
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