A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Method for non-melting pretreatment of polycarbosilane and cracking conversion of polycarbosilane into three-dimensional ceramic
The invention discloses a method for non-melting pretreatment of polycarbosilane and cracking conversion of polycarbosilane into three-dimensional ceramic, belonging to preparation of ceramic materials. The method comprises the following steps: a three-dimensional silicon carbide polymer precursor is synthesized, SiC(Al, rGO)p ceramic particles are prepared through high-temperature cracking underthe protection of an inert atmosphere, the SiC(Al, rGO)p ceramic particles and precursor powder are subjected to ball milling and uniform mixing, then drying and tabletting forming are conducted, thehigh-temperature sintering is conducted again so as to obtain 3D-SiC(Al, rGO) ceramic, and finally, the surface appearance of the ceramic is modified. A prepared three-dimensional ceramic material contains four elements, namely Si, C, O and Al; the Al is uniformly distributed in a SiOxCy amorphous phase in an atomic state, beta-SiC nanocrystals are embedded in a SiOxCy/Cfree amorphous phase of composite rGO, and SiO2 microcrystals exist. The crosslinking degree and the molecular weight of the precursor are expanded to form a three-dimensional network structure, evaporation of small molecular gas during cracking is reduced, the fracture toughness and the high-temperature-resistant stability of the ceramic are improved, and the ceramic can be applied to severe environments such as a high temperature environment.
一种聚碳硅烷不熔化预处理及其裂解转化三维陶瓷方法，涉及陶瓷材料制备。先合成三维碳化硅聚合物先驱体，在惰性气氛保护下高温裂解制备SiC(Al,rGO)p陶瓷颗粒，与先驱体粉末球磨混匀后烘干，压片成型后再次高温烧结得到3D‑SiC(Al,rGO)陶瓷，最后对陶瓷的表面形貌修饰。所述三维陶瓷材料含有Si、C、O、Al四种元素，Al以原子状态均匀分布于SiOC无定形相中，β‑SiC纳米晶镶嵌于复合rGO的SiOC/C无定形相中，存在SiO微晶。扩展先驱体的交联度与分子量以形成三维网络结构，减少裂解时小分子气体的蒸发，提高陶瓷断裂韧性与耐高温稳定性，满足高温等恶劣环境应用领域。
Method for non-melting pretreatment of polycarbosilane and cracking conversion of polycarbosilane into three-dimensional ceramic
The invention discloses a method for non-melting pretreatment of polycarbosilane and cracking conversion of polycarbosilane into three-dimensional ceramic, belonging to preparation of ceramic materials. The method comprises the following steps: a three-dimensional silicon carbide polymer precursor is synthesized, SiC(Al, rGO)p ceramic particles are prepared through high-temperature cracking underthe protection of an inert atmosphere, the SiC(Al, rGO)p ceramic particles and precursor powder are subjected to ball milling and uniform mixing, then drying and tabletting forming are conducted, thehigh-temperature sintering is conducted again so as to obtain 3D-SiC(Al, rGO) ceramic, and finally, the surface appearance of the ceramic is modified. A prepared three-dimensional ceramic material contains four elements, namely Si, C, O and Al; the Al is uniformly distributed in a SiOxCy amorphous phase in an atomic state, beta-SiC nanocrystals are embedded in a SiOxCy/Cfree amorphous phase of composite rGO, and SiO2 microcrystals exist. The crosslinking degree and the molecular weight of the precursor are expanded to form a three-dimensional network structure, evaporation of small molecular gas during cracking is reduced, the fracture toughness and the high-temperature-resistant stability of the ceramic are improved, and the ceramic can be applied to severe environments such as a high temperature environment.
一种聚碳硅烷不熔化预处理及其裂解转化三维陶瓷方法，涉及陶瓷材料制备。先合成三维碳化硅聚合物先驱体，在惰性气氛保护下高温裂解制备SiC(Al,rGO)p陶瓷颗粒，与先驱体粉末球磨混匀后烘干，压片成型后再次高温烧结得到3D‑SiC(Al,rGO)陶瓷，最后对陶瓷的表面形貌修饰。所述三维陶瓷材料含有Si、C、O、Al四种元素，Al以原子状态均匀分布于SiOC无定形相中，β‑SiC纳米晶镶嵌于复合rGO的SiOC/C无定形相中，存在SiO微晶。扩展先驱体的交联度与分子量以形成三维网络结构，减少裂解时小分子气体的蒸发，提高陶瓷断裂韧性与耐高温稳定性，满足高温等恶劣环境应用领域。
Method for non-melting pretreatment of polycarbosilane and cracking conversion of polycarbosilane into three-dimensional ceramic
一种聚碳硅烷不熔化预处理及其裂解转化三维陶瓷方法
YAO RONGQIAN (author) / HUANG WENYAN (author) / ZHENG YINONG (author) / LIAO LIANG (author) / LAN SIQI (author) / LUO TAO (author) / GUO PENGHUAN (author) / ZHU YEQI (author) / LI WANXIANG (author)
2020-07-28
Patent
Electronic Resource
Chinese
Polycarbosilane derived Ti3SiC2
| British Library Online Contents | 2008
Polycarbosilane Conversion Bonded Porous SiC Ceramics
| British Library Online Contents | 2005
Catalytic rearrangement preparation method of polycarbosilane
| European Patent Office | 2016
Polymer–ceramic conversion of a highly branched liquid polycarbosilane for SiC-based ceramics
| British Library Online Contents | 2008