Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Method for preparing silicon carbide ceramic-based composite material through continuous polycarbosilane dipping, pyrolysis and sintering
The invention discloses a method for preparing a silicon carbide ceramic-based composite material by continuous polycarbosilane impregnation, pyrolysis and sintering, which comprises the following steps: placing a fiber preform in an induction crucible and recording the initial weight, pre-impregnating and pyrolyzing by adopting an organic solution, then impregnating in a polycarbosilane solution under a negative pressure condition and pyrolyzing to obtain the silicon carbide ceramic-based composite material. And repeating the impregnation-pyrolysis step until the weight increment is less than a preset value, then carrying out high-temperature sintering crystallization, carrying out surface treatment and secondary pressure impregnation-pyrolysis on the obtained blank to improve the density, and finally carrying out finish machining to obtain the high-density (greater than or equal to 2.1 g/cm < 3 >) and low-open-porosity (lt). 10%) of the silicon carbide ceramic matrix composite material. The method has the advantages that (1) the product production efficiency is high, and the period is short and is improved by 30% compared with the existing method; (2) waste of raw materials is less, and the cost is saved by 10%; (3) the heat efficiency is improved, and the energy consumption is reduced by 20%; and (4) the fiber damage is small, the strength of the ceramic-based composite material is improved by 40%, and the fracture strain is improved by 50%.
本发明公开了一种连续聚碳硅烷浸渍热解烧结制备碳化硅陶瓷基复合材料的方法，将纤维预制件置于感应坩埚中并记录初始重量，采用有机溶液预浸渍热解，随后在负压条件下浸渍聚碳硅烷溶液并热解，重复浸渍‑热解步骤直至增重小于预定值，然后高温烧结晶化，对所得毛坯进行表面处理和二次加压浸渍‑热解以提高密度，最终精加工获得高密度(≥2.1g/cm3)、低开气孔率(<10％)的碳化硅陶瓷基复合材料。该方法(1)产品生产效率高，周期短，比现有方法提高30％；(2)原料浪费少，成本节约10％；(3)热效率提高，降低能耗20％；(4)纤维损伤小，陶瓷基复合材料强度提高40％，断裂应变提高50％。
Method for preparing silicon carbide ceramic-based composite material through continuous polycarbosilane dipping, pyrolysis and sintering
The invention discloses a method for preparing a silicon carbide ceramic-based composite material by continuous polycarbosilane impregnation, pyrolysis and sintering, which comprises the following steps: placing a fiber preform in an induction crucible and recording the initial weight, pre-impregnating and pyrolyzing by adopting an organic solution, then impregnating in a polycarbosilane solution under a negative pressure condition and pyrolyzing to obtain the silicon carbide ceramic-based composite material. And repeating the impregnation-pyrolysis step until the weight increment is less than a preset value, then carrying out high-temperature sintering crystallization, carrying out surface treatment and secondary pressure impregnation-pyrolysis on the obtained blank to improve the density, and finally carrying out finish machining to obtain the high-density (greater than or equal to 2.1 g/cm < 3 >) and low-open-porosity (lt). 10%) of the silicon carbide ceramic matrix composite material. The method has the advantages that (1) the product production efficiency is high, and the period is short and is improved by 30% compared with the existing method; (2) waste of raw materials is less, and the cost is saved by 10%; (3) the heat efficiency is improved, and the energy consumption is reduced by 20%; and (4) the fiber damage is small, the strength of the ceramic-based composite material is improved by 40%, and the fracture strain is improved by 50%.
本发明公开了一种连续聚碳硅烷浸渍热解烧结制备碳化硅陶瓷基复合材料的方法，将纤维预制件置于感应坩埚中并记录初始重量，采用有机溶液预浸渍热解，随后在负压条件下浸渍聚碳硅烷溶液并热解，重复浸渍‑热解步骤直至增重小于预定值，然后高温烧结晶化，对所得毛坯进行表面处理和二次加压浸渍‑热解以提高密度，最终精加工获得高密度(≥2.1g/cm3)、低开气孔率(<10％)的碳化硅陶瓷基复合材料。该方法(1)产品生产效率高，周期短，比现有方法提高30％；(2)原料浪费少，成本节约10％；(3)热效率提高，降低能耗20％；(4)纤维损伤小，陶瓷基复合材料强度提高40％，断裂应变提高50％。
Method for preparing silicon carbide ceramic-based composite material through continuous polycarbosilane dipping, pyrolysis and sintering
一种连续聚碳硅烷浸渍热解烧结制备碳化硅陶瓷基复合材料的方法
LI MIN (Autor:in) / CHEN ZHAOFENG (Autor:in)
01.11.2024
Patent
Elektronische Ressource
Chinesisch
IPC:
C04B
Kalk
,
LIME
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