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Ultrahigh-temperature ceramic single-source precursor with Hf-N-B main chain structure and preparation method of ultrahigh-temperature ceramic single-source precursor
The invention relates to an Hf-N-B main chain structure ultrahigh-temperature ceramic single-source precursor and a preparation method thereof, the Hf-N-B main chain structure ultrahigh-temperature ceramic single-source precursor comprises a molecular chain structure shown as follows: # imgabs0 #, the main chain structure unit is Hf-N-B, n represents the degree of polymerization, and ultrahigh temperature means that the use temperature of pyrolysis conversion ceramic of the precursor is 1600 DEG C or above; the preparation method comprises the following steps: firstly, modifying and terminating trimethylamine borane by using an active substituent group, filtering the solution, reacting with HfCl4, removing the solvent, continuously heating to decompose and escape the precipitate, and finally obtaining a precursor with the Hf content of more than 30wt%. The dissolving and melting performance and spinning performance of the precursor can be improved through side group regulation and control, the diameter of the fiber obtained through spinning is smaller than 50 micrometers, the length of the fiber is larger than 20 cm, and therefore the problem that the high refractory metal content and the good rheological property are difficult to achieve at the same time is solved. And performing high-temperature pyrolysis on the precursor to obtain the HfC/HfB2 ultrahigh-temperature composite ceramic with the Hf content as high as 80wt%.
本发明涉及一种Hf‑N‑B主链结构超高温陶瓷单源先驱体及其制备方法，包括以下所示的分子链结构：#imgabs0#其中主链结构单元为Hf‑N‑B，n表示聚合度，超高温是指先驱体热解转化陶瓷的使用温度在1600℃以上；其制备方法首先利用活性取代基对三甲胺基硼烷进行改性和封端，溶液过滤后与HfCl4反应，然后去除溶剂继续升温使沉淀分解逸出，最终得到Hf含量超过30wt％的先驱体。本发明可通过侧基调控改善先驱体溶解熔融性能及纺丝性能，纺丝所得纤维直径小于50μm，长度大于20cm，从而解决了高难熔金属含量和良好流变性能难以兼得的难题。先驱体经高温热解得到Hf含量高达80wt％的HfC/HfB2超高温复相陶瓷。
Ultrahigh-temperature ceramic single-source precursor with Hf-N-B main chain structure and preparation method of ultrahigh-temperature ceramic single-source precursor
The invention relates to an Hf-N-B main chain structure ultrahigh-temperature ceramic single-source precursor and a preparation method thereof, the Hf-N-B main chain structure ultrahigh-temperature ceramic single-source precursor comprises a molecular chain structure shown as follows: # imgabs0 #, the main chain structure unit is Hf-N-B, n represents the degree of polymerization, and ultrahigh temperature means that the use temperature of pyrolysis conversion ceramic of the precursor is 1600 DEG C or above; the preparation method comprises the following steps: firstly, modifying and terminating trimethylamine borane by using an active substituent group, filtering the solution, reacting with HfCl4, removing the solvent, continuously heating to decompose and escape the precipitate, and finally obtaining a precursor with the Hf content of more than 30wt%. The dissolving and melting performance and spinning performance of the precursor can be improved through side group regulation and control, the diameter of the fiber obtained through spinning is smaller than 50 micrometers, the length of the fiber is larger than 20 cm, and therefore the problem that the high refractory metal content and the good rheological property are difficult to achieve at the same time is solved. And performing high-temperature pyrolysis on the precursor to obtain the HfC/HfB2 ultrahigh-temperature composite ceramic with the Hf content as high as 80wt%.
本发明涉及一种Hf‑N‑B主链结构超高温陶瓷单源先驱体及其制备方法，包括以下所示的分子链结构：#imgabs0#其中主链结构单元为Hf‑N‑B，n表示聚合度，超高温是指先驱体热解转化陶瓷的使用温度在1600℃以上；其制备方法首先利用活性取代基对三甲胺基硼烷进行改性和封端，溶液过滤后与HfCl4反应，然后去除溶剂继续升温使沉淀分解逸出，最终得到Hf含量超过30wt％的先驱体。本发明可通过侧基调控改善先驱体溶解熔融性能及纺丝性能，纺丝所得纤维直径小于50μm，长度大于20cm，从而解决了高难熔金属含量和良好流变性能难以兼得的难题。先驱体经高温热解得到Hf含量高达80wt％的HfC/HfB2超高温复相陶瓷。
Ultrahigh-temperature ceramic single-source precursor with Hf-N-B main chain structure and preparation method of ultrahigh-temperature ceramic single-source precursor
一种Hf-N-B主链结构超高温陶瓷单源先驱体及其制备方法
HAN CHENG (author) / ZHAO ZHE (author) / WANG YINGDE (author) / WANG XIAOZHOU (author) / SHAO CHANGWEI (author) / GOU YANZI (author) / WANG BING (author) / LONG XIN (author) / ZHANG XIAOSHAN (author)
2024-01-26
Patent
Electronic Resource
Chinese
IPC:
C08G
MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
,
Makromolekulare Verbindungen, anders erhalten als durch Reaktionen, an denen nur ungesättigte Kohlenstoff-Kohlenstoff-Bindungen beteiligt sind
/
C04B
Kalk
,
LIME
/
D01F
Chemische Gesichtspunkte bei der Herstellung von produzierten Filamenten, Zwirnen, Fasern, Borsten oder Bändern
,
CHEMICAL FEATURES IN THE MANUFACTURE OF MAN-MADE FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
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