Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Multiphase coupling low-temperature preparation method of ultrahigh-temperature ceramic coating
The invention relates to a multiphase coupling low-temperature preparation method of an ultrahigh-temperature ceramic coating, which comprises the following steps: by using a ceramic precursor as a raw material, mixing a precursor pyrolysis product with the precursor to prepare slurry, and cracking the precursor in the slurry in the deposition heating process (i.e., low-pressure state) by combining a CVD process, and preparing the thin film which can be used compactly at high temperature. The pyrolysis products in the slurry cannot generate volume shrinkage at high temperature, so that the volume shrinkage of the slurry can be reduced to a certain extent, and cracking is reduced; when the ceramic precursor is cracked under low pressure, a small molecular gas-phase product can escape more quickly and is not accumulated in the ceramic, so that the occurrence of internal holes can be reduced; the CVD process can be used for sealing and filling microcracks generated in the precursor cracking process, so that the integrity of the coating is ensured.
本发明涉及一种超高温陶瓷涂层的多相耦合低温制备方法，涂层是以陶瓷前驱体为原料，用前驱体热解产物与前驱体混合制备浆料，结合CVD工艺使得浆料中的前驱体在沉积的升温过程中(即低压状态)完成裂解，制备出可以在高温下使用致密的薄膜。浆料中的热解产物在高温下不会发生体积收缩，可以在一定程度上减少浆料的体积收缩，减少开裂；陶瓷前驱体在低压下裂解时可以使小分子气相产物更快地逸出而不在陶瓷内部积累，这样可以减少内部孔洞的出现；CVD工艺可以封填前驱体裂解过程中产生的微裂纹，保证涂层完整性。
Multiphase coupling low-temperature preparation method of ultrahigh-temperature ceramic coating
The invention relates to a multiphase coupling low-temperature preparation method of an ultrahigh-temperature ceramic coating, which comprises the following steps: by using a ceramic precursor as a raw material, mixing a precursor pyrolysis product with the precursor to prepare slurry, and cracking the precursor in the slurry in the deposition heating process (i.e., low-pressure state) by combining a CVD process, and preparing the thin film which can be used compactly at high temperature. The pyrolysis products in the slurry cannot generate volume shrinkage at high temperature, so that the volume shrinkage of the slurry can be reduced to a certain extent, and cracking is reduced; when the ceramic precursor is cracked under low pressure, a small molecular gas-phase product can escape more quickly and is not accumulated in the ceramic, so that the occurrence of internal holes can be reduced; the CVD process can be used for sealing and filling microcracks generated in the precursor cracking process, so that the integrity of the coating is ensured.
本发明涉及一种超高温陶瓷涂层的多相耦合低温制备方法，涂层是以陶瓷前驱体为原料，用前驱体热解产物与前驱体混合制备浆料，结合CVD工艺使得浆料中的前驱体在沉积的升温过程中(即低压状态)完成裂解，制备出可以在高温下使用致密的薄膜。浆料中的热解产物在高温下不会发生体积收缩，可以在一定程度上减少浆料的体积收缩，减少开裂；陶瓷前驱体在低压下裂解时可以使小分子气相产物更快地逸出而不在陶瓷内部积累，这样可以减少内部孔洞的出现；CVD工艺可以封填前驱体裂解过程中产生的微裂纹，保证涂层完整性。
Multiphase coupling low-temperature preparation method of ultrahigh-temperature ceramic coating
一种超高温陶瓷涂层的多相耦合低温制备方法
LUAN XINGANG (Autor:in) / LI MIN (Autor:in) / CHENG LAIFEI (Autor:in)
22.01.2021
Patent
Elektronische Ressource
Chinesisch
IPC:
C04B
Kalk
,
LIME
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