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Method for preparing gradient porous silicon nitride ceramic
The invention discloses a method for preparing gradient porous silicon nitride ceramic. The method comprises the following steps: 1) pretreating biomass, carbonizing, grinding so as to obtain a carbon-silicon precursor, mixing the carbon-silicon precursor with silicon nitride and an additive, grinding and pelleting, so as to obtain mixtures containing carbon and silicon; 2) sequentially feeding two or more than two mixtures containing carbon and silicon obtained in the step 1) into a mold, feeding each layer in turn, performing jump vibration, and molding under the pressure of 3-20MPa, so as to obtain a blank; and 3) sintering the blank in nitrogen atmosphere at normal pressure, and cooling, thereby obtaining the gradient porous silicon nitride ceramic. The gradient porous silicon nitride ceramic can be prepared by using a one-step carbon thermal recovery-normal pressure sintering method which is simple in process and low in cost.
Method for preparing gradient porous silicon nitride ceramic
The invention discloses a method for preparing gradient porous silicon nitride ceramic. The method comprises the following steps: 1) pretreating biomass, carbonizing, grinding so as to obtain a carbon-silicon precursor, mixing the carbon-silicon precursor with silicon nitride and an additive, grinding and pelleting, so as to obtain mixtures containing carbon and silicon; 2) sequentially feeding two or more than two mixtures containing carbon and silicon obtained in the step 1) into a mold, feeding each layer in turn, performing jump vibration, and molding under the pressure of 3-20MPa, so as to obtain a blank; and 3) sintering the blank in nitrogen atmosphere at normal pressure, and cooling, thereby obtaining the gradient porous silicon nitride ceramic. The gradient porous silicon nitride ceramic can be prepared by using a one-step carbon thermal recovery-normal pressure sintering method which is simple in process and low in cost.
Method for preparing gradient porous silicon nitride ceramic
GUO WEI (author) / LIU TIANTIAN (author) / XU XIAOMIN (author)
2016-02-10
Patent
Electronic Resource
English
IPC:
C04B
Kalk
,
LIME
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