Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Preparation method of ceramic core coating based on impregnation and freeze-drying technologies
The invention discloses a preparation method of a ceramic core coating based on impregnation and freeze-drying technologies. The method comprises: S1, mixing aluminum isopropoxide and deionized wateraccording to a molar ratio, and stirring; S2, adding a peptizing agent HNO3, controlling the pH value of the slurry, and stirring under a water bath condition to obtain transparent aluminum oxide slurry after a period of time; S3, subjecting a ceramic core base material to impregnation treatment to obtain a ceramic core coating with a certain thickness; S4, pre-freezing the obtained ceramic core coating, and carrying out sublimation drying treatment; and S5, sintering the ceramic core coating subjected to sublimation drying treatment, and carrying out heat preservation for a period of time. Onone hand, the high-temperature thermal stability is good, chemical reaction with Hf, Al, C and other elements is avoided, and the prepared coating is free of cracking and peeling phenomena; on the other hand, the thickness of the ceramic core coating can be controlled; and the depoling performance of a original silicon-based mold core is not reduced.
本发明公开了一种基于浸渍冷冻干燥的陶瓷型芯涂层制备方法，包括步骤：S1，将异丙醇铝与去离子水按摩尔比混合，并进行搅拌；S2，添加胶溶剂HNO，控制浆料的PH值，水浴条件下进行搅拌，一段时间后得到透明氧化铝浆料；S3，对陶瓷型芯基材进行浸渍处理，得到具有一定厚度的陶瓷型芯涂层；S4，对所得陶瓷型芯涂层进行预冻，并进行升华干燥处理；S5，对升华干燥处理后的陶瓷型芯涂层进行烧结，并保温一段时间。一方面高温热稳定性良好，不与Hf、Al、C等元素发生化学反应，制备出的涂层无龟裂和剥落现象；另一方面可控制陶瓷型芯涂层的厚度；也不会降低原有硅基型芯的脱芯性能。
Preparation method of ceramic core coating based on impregnation and freeze-drying technologies
The invention discloses a preparation method of a ceramic core coating based on impregnation and freeze-drying technologies. The method comprises: S1, mixing aluminum isopropoxide and deionized wateraccording to a molar ratio, and stirring; S2, adding a peptizing agent HNO3, controlling the pH value of the slurry, and stirring under a water bath condition to obtain transparent aluminum oxide slurry after a period of time; S3, subjecting a ceramic core base material to impregnation treatment to obtain a ceramic core coating with a certain thickness; S4, pre-freezing the obtained ceramic core coating, and carrying out sublimation drying treatment; and S5, sintering the ceramic core coating subjected to sublimation drying treatment, and carrying out heat preservation for a period of time. Onone hand, the high-temperature thermal stability is good, chemical reaction with Hf, Al, C and other elements is avoided, and the prepared coating is free of cracking and peeling phenomena; on the other hand, the thickness of the ceramic core coating can be controlled; and the depoling performance of a original silicon-based mold core is not reduced.
本发明公开了一种基于浸渍冷冻干燥的陶瓷型芯涂层制备方法，包括步骤：S1，将异丙醇铝与去离子水按摩尔比混合，并进行搅拌；S2，添加胶溶剂HNO，控制浆料的PH值，水浴条件下进行搅拌，一段时间后得到透明氧化铝浆料；S3，对陶瓷型芯基材进行浸渍处理，得到具有一定厚度的陶瓷型芯涂层；S4，对所得陶瓷型芯涂层进行预冻，并进行升华干燥处理；S5，对升华干燥处理后的陶瓷型芯涂层进行烧结，并保温一段时间。一方面高温热稳定性良好，不与Hf、Al、C等元素发生化学反应，制备出的涂层无龟裂和剥落现象；另一方面可控制陶瓷型芯涂层的厚度；也不会降低原有硅基型芯的脱芯性能。
Preparation method of ceramic core coating based on impregnation and freeze-drying technologies
一种基于浸渍冷冻干燥技术的陶瓷型芯涂层的制备方法
PAN ZHIPING (Autor:in) / SONG WENZHENG (Autor:in) / LIU CHAOFENG (Autor:in) / GUO JIANZHENG (Autor:in)
28.08.2020
Patent
Elektronische Ressource
Chinesisch
IPC:
C04B
Kalk
,
LIME
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