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Preparation of fiber monolith zirconium boride ceramic with SiCw as interface through wet spinning and co-extrusion
The invention provides a fiber monolith zirconium boride ceramic with SiCw as an interface and prepared by wet spinning and co-extrusion. A preparation method is characterized by comprising the following steps: (1) firstly adding a curing agent and a plasticizer into an organic solvent, stirring the mixture for dissolving, then respectively adding ceramic powder of fiber monolith precursor cells and ceramic powder of a fiber monolith precursor cell interface layer, uniformly stirring the mixture to form two kinds of spinneret slurry with different components, and carrying out melt spinning under mechanical pressure, so as to obtain fiber monolith precursor fiber monolith precursor fiber monolith, and ejecting the fiber monolith into a gel tank through a co-extrusion spinning nozzle to obtain a fiber monolith precursor with an interface layer; 2) cutting the precursor, arranging the precursor in parallel, and carryingout warm pressing to compaction; 3) carrying out vacuum degreasing; and 4) carrying out hot-pressing and sintering to obtain the strong-interface fiber monolith zirconium boride superhigh-temperature ceramic of which the fracture toughness can reach 11 MPa.m<1/2> or above. The wet spinning co-extrusion method for forming the fiber monolith precursor is simplified in process and is beneficial to mechanical arrangement, wherein the microstructure of the obtained fibermonolith zirconium boride ceramic is accurately controlled, and the fracture toughness and oxidation ablation resistance are synergistically improved.
本发明提供一种湿纺共挤出制备SiCw作为界面的纤维独石硼化锆陶瓷，其特征在于采用以下步骤：1）先将固化剂和增塑剂加入有机溶剂中搅拌溶解，再分别加入纤维独石前驱体胞体的陶瓷粉料和纤维独石前驱体胞体界面层的陶瓷粉料、搅拌均匀，形成两种不同组分的喷丝料浆，在机械压力下，通过共挤出喷丝头喷入凝胶槽中，即得具有界面层的纤维独石前驱体；2）裁切，平行排布，温压使其致密；3）真空脱脂；4）热压烧结，即得强界面纤维独石硼化锆超高温陶瓷，其断裂韧性可达11MPa·m1/2以上。本发明湿纺共挤出法成型纤维独石前驱体简化工艺，有利于机械排布，所得的纤维独石硼化锆陶瓷，微观结构达到精确控制，断裂韧性和抗氧化烧蚀性协同提高。
Preparation of fiber monolith zirconium boride ceramic with SiCw as interface through wet spinning and co-extrusion
The invention provides a fiber monolith zirconium boride ceramic with SiCw as an interface and prepared by wet spinning and co-extrusion. A preparation method is characterized by comprising the following steps: (1) firstly adding a curing agent and a plasticizer into an organic solvent, stirring the mixture for dissolving, then respectively adding ceramic powder of fiber monolith precursor cells and ceramic powder of a fiber monolith precursor cell interface layer, uniformly stirring the mixture to form two kinds of spinneret slurry with different components, and carrying out melt spinning under mechanical pressure, so as to obtain fiber monolith precursor fiber monolith precursor fiber monolith, and ejecting the fiber monolith into a gel tank through a co-extrusion spinning nozzle to obtain a fiber monolith precursor with an interface layer; 2) cutting the precursor, arranging the precursor in parallel, and carryingout warm pressing to compaction; 3) carrying out vacuum degreasing; and 4) carrying out hot-pressing and sintering to obtain the strong-interface fiber monolith zirconium boride superhigh-temperature ceramic of which the fracture toughness can reach 11 MPa.m<1/2> or above. The wet spinning co-extrusion method for forming the fiber monolith precursor is simplified in process and is beneficial to mechanical arrangement, wherein the microstructure of the obtained fibermonolith zirconium boride ceramic is accurately controlled, and the fracture toughness and oxidation ablation resistance are synergistically improved.
本发明提供一种湿纺共挤出制备SiCw作为界面的纤维独石硼化锆陶瓷，其特征在于采用以下步骤：1）先将固化剂和增塑剂加入有机溶剂中搅拌溶解，再分别加入纤维独石前驱体胞体的陶瓷粉料和纤维独石前驱体胞体界面层的陶瓷粉料、搅拌均匀，形成两种不同组分的喷丝料浆，在机械压力下，通过共挤出喷丝头喷入凝胶槽中，即得具有界面层的纤维独石前驱体；2）裁切，平行排布，温压使其致密；3）真空脱脂；4）热压烧结，即得强界面纤维独石硼化锆超高温陶瓷，其断裂韧性可达11MPa·m1/2以上。本发明湿纺共挤出法成型纤维独石前驱体简化工艺，有利于机械排布，所得的纤维独石硼化锆陶瓷，微观结构达到精确控制，断裂韧性和抗氧化烧蚀性协同提高。
Preparation of fiber monolith zirconium boride ceramic with SiCw as interface through wet spinning and co-extrusion
湿纺共挤出制备SiCw作为界面的纤维独石硼化锆陶瓷
WEI CHUNCHENG (Autor:in) / WEN GUANGWU (Autor:in) / LI SHUANG (Autor:in)
03.11.2020
Patent
Elektronische Ressource
Chinesisch
IPC:
C04B
Kalk
,
LIME
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