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Method for preparing high-toughness high-temperature-resistant directionally-arranged silicon nitride monolithic porous ceramic
The invention relates to a method for preparing high-toughness and high-temperature-resistant silicon nitride monolithic porous ceramic, which comprises the following steps of: preparing beta-Si3N4 whiskers with high length-diameter ratio by using alpha-Si3N4 as a raw material and Y2O3 as an auxiliary agent through a normal-pressure sintering method, preparing tape casting slurry from the prepared beta-Si3N4 whiskers, directionally arranging the silicon nitride whiskers by using tape casting to prepare a thin film, and carrying out laminated sample preparation, thereby obtaining the high-toughness and high-temperature-resistant silicon nitride monolithic porous ceramic. SiO is subjected to high-temperature evaporation gas phase infiltration and reacts with residual carbon among fibers to obtain silicon nitride, and the silicon nitride monolithic porous ceramic material is prepared; the structure design thought of fiber directional arrangement and secondary silicon nitride bonding is provided, effective preparation of the porous ceramic constructed by the pure silicon nitride fibers is achieved, the advantage of anisotropy of the porous ceramic is exerted through directional arrangement, and therefore the fracture toughness of the silicon nitride ceramic is effectively improved, the high-temperature resistance is improved to the maximum extent through bonding of pure silicon nitride, and the service life of the porous ceramic is prolonged. The application range of the porous silicon nitride ceramic material is greatly expanded.
一种高韧性耐高温的氮化硅独石多孔陶瓷制备的方法，α‑Si3N4为原料，Y2O3为助剂，通过常压烧结的方法制备高长径比的β‑Si3N4晶须，以制备的β‑Si3N4晶须配置流延浆料，利用流延成型将氮化硅晶须进行定向排列制作薄膜并进行叠层制样，通过SiO高温蒸发气相渗入与纤维之间的残留碳进行反应获得氮化硅，制备得到氮化硅独石多孔陶瓷材料；本发明提出了纤维定向排列和二次氮化硅粘接的组织设计思路，实现纯氮化硅纤维构建的多孔陶瓷有效制备，通过定向排列发挥其各向异性的优势，从而有效的提高氮化硅陶瓷断裂韧性，通过纯氮化硅的粘接极大限度改善耐高温性能，大大拓展了多孔氮化硅陶瓷材料的应用范围。
Method for preparing high-toughness high-temperature-resistant directionally-arranged silicon nitride monolithic porous ceramic
The invention relates to a method for preparing high-toughness and high-temperature-resistant silicon nitride monolithic porous ceramic, which comprises the following steps of: preparing beta-Si3N4 whiskers with high length-diameter ratio by using alpha-Si3N4 as a raw material and Y2O3 as an auxiliary agent through a normal-pressure sintering method, preparing tape casting slurry from the prepared beta-Si3N4 whiskers, directionally arranging the silicon nitride whiskers by using tape casting to prepare a thin film, and carrying out laminated sample preparation, thereby obtaining the high-toughness and high-temperature-resistant silicon nitride monolithic porous ceramic. SiO is subjected to high-temperature evaporation gas phase infiltration and reacts with residual carbon among fibers to obtain silicon nitride, and the silicon nitride monolithic porous ceramic material is prepared; the structure design thought of fiber directional arrangement and secondary silicon nitride bonding is provided, effective preparation of the porous ceramic constructed by the pure silicon nitride fibers is achieved, the advantage of anisotropy of the porous ceramic is exerted through directional arrangement, and therefore the fracture toughness of the silicon nitride ceramic is effectively improved, the high-temperature resistance is improved to the maximum extent through bonding of pure silicon nitride, and the service life of the porous ceramic is prolonged. The application range of the porous silicon nitride ceramic material is greatly expanded.
一种高韧性耐高温的氮化硅独石多孔陶瓷制备的方法，α‑Si3N4为原料，Y2O3为助剂，通过常压烧结的方法制备高长径比的β‑Si3N4晶须，以制备的β‑Si3N4晶须配置流延浆料，利用流延成型将氮化硅晶须进行定向排列制作薄膜并进行叠层制样，通过SiO高温蒸发气相渗入与纤维之间的残留碳进行反应获得氮化硅，制备得到氮化硅独石多孔陶瓷材料；本发明提出了纤维定向排列和二次氮化硅粘接的组织设计思路，实现纯氮化硅纤维构建的多孔陶瓷有效制备，通过定向排列发挥其各向异性的优势，从而有效的提高氮化硅陶瓷断裂韧性，通过纯氮化硅的粘接极大限度改善耐高温性能，大大拓展了多孔氮化硅陶瓷材料的应用范围。
Method for preparing high-toughness high-temperature-resistant directionally-arranged silicon nitride monolithic porous ceramic
一种高韧性耐高温的定向排列氮化硅独石多孔陶瓷制备的方法
YANG JIANFENG (Autor:in) / SHI ZHUOTAO (Autor:in) / ZHI QIANG (Autor:in) / SUN ZHENYU (Autor:in) / WANG BO (Autor:in) / SHI ZHONGQI (Autor:in)
29.07.2022
Patent
Elektronische Ressource
Chinesisch
IPC:
C04B
Kalk
,
LIME
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