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Preparation method of double-layer silicon-oxygen-carbon composite ceramic coating for porous ceramic heat insulation matrix
The invention relates to a preparation method of a double-layer silicon-oxygen-carbon composite ceramic coating for a porous ceramic heat insulation matrix. Hydrogen-containing polysiloxane and tetravinyl cyclotetrasiloxane are used as polymer precursors, molybdenum disilicide is used as an emitting agent, barium-aluminum-silicon glass is used as a binder, and a porous layer and a compact layer are respectively formed by judging whether a coating contains a pore-forming agent dimethyl silicone oil or not and changing the pyrolysis temperature. A double-layer SiOC-BAS-MoSi2 coating containing a porous layer and a compact layer is prepared on a mullite fiber heat insulation tile in a two-time brush coating mode. Through the design of the double-layer coating, the high-emission coating with excellent emission performance and mechanical performance is prepared on the mullite fiber ceramic heat insulation tile. The coating is high in thickness, good thermal protection capacity is achieved, the oxidation resistance of the coating can be improved through the compact surface layer of the coating, good emission performance can be provided through the existence of the high-emission agent molybdenum disilicide in the coating, integration of high-temperature thermal protection and emission performance is achieved, and the high application value is achieved.
本发明涉及一种用于多孔陶瓷隔热基体的双层硅氧碳复合陶瓷涂层的制备方法。以含氢聚硅氧烷和四乙烯基环四硅氧烷为聚合物前驱体，以二硅化钼为发射剂，以钡铝硅玻璃作为粘结剂，通过涂层中是否含造孔剂二甲基硅油和改变热解温度分别形成多孔层和致密层，采用两次刷涂的方式在莫来石纤维隔热瓦上制备了含多孔层和致密层的双层的SiOC‑BAS‑MoSi2涂层。通过双层涂层的设计，实现在莫来石纤维陶瓷隔热瓦上制备发射性能和力学性能俱优的高发射涂层。涂层厚度较高实现良好的热防护能力，涂层致密表层可提高涂层的抗氧化能力，涂层内部高发射剂二硅化钼的存在能提供良好的发射性能，实现高温热防护和发射性能的一体化，具有较大的应用价值。
Preparation method of double-layer silicon-oxygen-carbon composite ceramic coating for porous ceramic heat insulation matrix
The invention relates to a preparation method of a double-layer silicon-oxygen-carbon composite ceramic coating for a porous ceramic heat insulation matrix. Hydrogen-containing polysiloxane and tetravinyl cyclotetrasiloxane are used as polymer precursors, molybdenum disilicide is used as an emitting agent, barium-aluminum-silicon glass is used as a binder, and a porous layer and a compact layer are respectively formed by judging whether a coating contains a pore-forming agent dimethyl silicone oil or not and changing the pyrolysis temperature. A double-layer SiOC-BAS-MoSi2 coating containing a porous layer and a compact layer is prepared on a mullite fiber heat insulation tile in a two-time brush coating mode. Through the design of the double-layer coating, the high-emission coating with excellent emission performance and mechanical performance is prepared on the mullite fiber ceramic heat insulation tile. The coating is high in thickness, good thermal protection capacity is achieved, the oxidation resistance of the coating can be improved through the compact surface layer of the coating, good emission performance can be provided through the existence of the high-emission agent molybdenum disilicide in the coating, integration of high-temperature thermal protection and emission performance is achieved, and the high application value is achieved.
本发明涉及一种用于多孔陶瓷隔热基体的双层硅氧碳复合陶瓷涂层的制备方法。以含氢聚硅氧烷和四乙烯基环四硅氧烷为聚合物前驱体，以二硅化钼为发射剂，以钡铝硅玻璃作为粘结剂，通过涂层中是否含造孔剂二甲基硅油和改变热解温度分别形成多孔层和致密层，采用两次刷涂的方式在莫来石纤维隔热瓦上制备了含多孔层和致密层的双层的SiOC‑BAS‑MoSi2涂层。通过双层涂层的设计，实现在莫来石纤维陶瓷隔热瓦上制备发射性能和力学性能俱优的高发射涂层。涂层厚度较高实现良好的热防护能力，涂层致密表层可提高涂层的抗氧化能力，涂层内部高发射剂二硅化钼的存在能提供良好的发射性能，实现高温热防护和发射性能的一体化，具有较大的应用价值。
Preparation method of double-layer silicon-oxygen-carbon composite ceramic coating for porous ceramic heat insulation matrix
一种用于多孔陶瓷隔热基体的双层硅氧碳复合陶瓷涂层的制备方法
SU DONG (author) / TIAN ZHENGKAI (author) / ZHU WENXIA (author) / LI XIAOLEI (author) / JI HUIMING (author)
2021-06-25
Patent
Electronic Resource
Chinese
IPC:
C04B
Kalk
,
LIME
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