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Porous silicon nitride ceramic and preparation method thereof
The invention relates to the technical field of porous ceramic material preparation, in particular to porous silicon nitride ceramic and a preparation method thereof.Natural wood is subjected to pretreatment, hot pressing and high-temperature carbonization to obtain a carbon template of a layered structure, and then vacuum impregnation is conducted to enable rare earth nitrate to be attached to the inner wall of the carbon template; and decomposing the nitrate into rare earth oxide by a high-temperature pyrolysis method, and finally carrying out carbon thermal reduction nitridation reaction at high temperature to obtain the porous silicon nitride ceramic. After sintering, the layered three-dimensional interconnected porous silicon nitride ceramic is a pure beta phase and has linear shrinkage of 0.5-1%, and according to requirements, the porosity range of the ceramic can be accurately controlled between 40% and 70% by accurately controlling the wood volume reduction amount through early-stage chemical corrosion and hot pressing of natural wood, the interlayer spacing can be accurately controlled between 5 microns and 25 microns, the slenderness ratio of beta-Si3N4 whiskers can reach 10-30, and the porosity of the ceramic can be controlled between 40% and 70%. And meanwhile, high porosity and high strength and toughness are achieved. The problem that the porosity cannot be regulated and controlled due to dependence on a biological template in the prior art is solved.
本发明涉及多孔陶瓷材料制备技术领域，尤其是多孔氮化硅陶瓷及其制备方法，对天然木材的预处理、热压和高温碳化获得具有层状结构的炭模板，随后真空浸渍使炭模板内壁上附着稀土硝酸盐，后经过高温热解的方法将硝酸盐分解成稀土氧化物，最后在高温下进行碳热还原氮化反应，获得多孔氮化硅陶瓷。烧结后层状三维互联多孔氮化硅陶瓷为纯β相，具有0.5～1％的线收缩，且根据需求，通过对天然木材前期的化学腐蚀和热压精准的控制木材体积减小的量可将其孔隙率范围精准控制在40％～70％之间，层间距可精准控制在5～25μm，β‑Si3N4晶须长径比可达10～30，同时兼具高孔隙率及高强韧性。解决现有技术中存在的依赖生物模板，导致的气孔率无法调控的问题。
Porous silicon nitride ceramic and preparation method thereof
The invention relates to the technical field of porous ceramic material preparation, in particular to porous silicon nitride ceramic and a preparation method thereof.Natural wood is subjected to pretreatment, hot pressing and high-temperature carbonization to obtain a carbon template of a layered structure, and then vacuum impregnation is conducted to enable rare earth nitrate to be attached to the inner wall of the carbon template; and decomposing the nitrate into rare earth oxide by a high-temperature pyrolysis method, and finally carrying out carbon thermal reduction nitridation reaction at high temperature to obtain the porous silicon nitride ceramic. After sintering, the layered three-dimensional interconnected porous silicon nitride ceramic is a pure beta phase and has linear shrinkage of 0.5-1%, and according to requirements, the porosity range of the ceramic can be accurately controlled between 40% and 70% by accurately controlling the wood volume reduction amount through early-stage chemical corrosion and hot pressing of natural wood, the interlayer spacing can be accurately controlled between 5 microns and 25 microns, the slenderness ratio of beta-Si3N4 whiskers can reach 10-30, and the porosity of the ceramic can be controlled between 40% and 70%. And meanwhile, high porosity and high strength and toughness are achieved. The problem that the porosity cannot be regulated and controlled due to dependence on a biological template in the prior art is solved.
本发明涉及多孔陶瓷材料制备技术领域，尤其是多孔氮化硅陶瓷及其制备方法，对天然木材的预处理、热压和高温碳化获得具有层状结构的炭模板，随后真空浸渍使炭模板内壁上附着稀土硝酸盐，后经过高温热解的方法将硝酸盐分解成稀土氧化物，最后在高温下进行碳热还原氮化反应，获得多孔氮化硅陶瓷。烧结后层状三维互联多孔氮化硅陶瓷为纯β相，具有0.5～1％的线收缩，且根据需求，通过对天然木材前期的化学腐蚀和热压精准的控制木材体积减小的量可将其孔隙率范围精准控制在40％～70％之间，层间距可精准控制在5～25μm，β‑Si3N4晶须长径比可达10～30，同时兼具高孔隙率及高强韧性。解决现有技术中存在的依赖生物模板，导致的气孔率无法调控的问题。
Porous silicon nitride ceramic and preparation method thereof
一种多孔氮化硅陶瓷及其制备方法
WANG BO (author) / XU JIAOQIAN (author) / ZHOU XIAONAN (author) / HAO XU (author) / REN YI (author) / LI CHUANYI (author) / WANG PENG (author) / YANG JIANFENG (author)
2024-08-09
Patent
Electronic Resource
Chinese
IPC:
C04B
Kalk
,
LIME
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