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Boron-containing high-temperature-resistant near-stoichiometric silicon carbide fiber and preparation method thereof
The invention discloses a boron-containing high-temperature-resistant near-stoichiometric silicon carbide fiber and a preparation method thereof, and the preparation method comprises a spinning stage, a non-melting stage, a pre-sintering stage, a densification sintering stage and a nitriding stage, and is characterized in that in the non-melting stage, the boron-containing high-temperature-resistant near-stoichiometric silicon carbide fiber is prepared; the metal-doped polycarbosilane precursor fiber obtained in the spinning stage is subjected to a boron doping reaction in an atmosphere containing boron trichloride and is subjected to a cross-linking reaction in an atmosphere of a gaseous hydrocarbon with carbon-carbon double bonds in sequence. The method is simple to operate, high in production efficiency, low in production cost and easy to be used for large-scale industrial production. The prepared boron-containing high-temperature-resistant near-stoichiometric silicon carbide fiber has the advantages of being low in oxygen content, high in densification degree, few in defect, stable in structure, high in tensile strength modulus, large in grain size, resistant to high temperature, good in oxidation resistance and creep resistance and the like.
本发明公开了一种含硼耐高温近化学计量比碳化硅纤维及其制备方法，该制备方法包括纺丝阶段、不熔化阶段、预烧结阶段、致密化烧结阶段和氮化阶段，其特征在于：所述不熔化阶段中，将纺丝阶段所得金属掺杂聚碳硅烷原丝纤维依次在含三氯化硼的气氛下进行掺硼反应和在具有碳碳双键的气态碳氢化合物的气氛下进行交联反应。该方法操作简单，生产效率高，生产成本低，易用于大批量工业化生产。制备得到的含硼耐高温近化学计量比碳化硅纤维具有氧含量低，致密化程度高，缺陷少，结构稳定，拉伸强度模量高，晶粒尺寸大，耐高温、抗氧化及抗蠕变性能好等优点。
Boron-containing high-temperature-resistant near-stoichiometric silicon carbide fiber and preparation method thereof
The invention discloses a boron-containing high-temperature-resistant near-stoichiometric silicon carbide fiber and a preparation method thereof, and the preparation method comprises a spinning stage, a non-melting stage, a pre-sintering stage, a densification sintering stage and a nitriding stage, and is characterized in that in the non-melting stage, the boron-containing high-temperature-resistant near-stoichiometric silicon carbide fiber is prepared; the metal-doped polycarbosilane precursor fiber obtained in the spinning stage is subjected to a boron doping reaction in an atmosphere containing boron trichloride and is subjected to a cross-linking reaction in an atmosphere of a gaseous hydrocarbon with carbon-carbon double bonds in sequence. The method is simple to operate, high in production efficiency, low in production cost and easy to be used for large-scale industrial production. The prepared boron-containing high-temperature-resistant near-stoichiometric silicon carbide fiber has the advantages of being low in oxygen content, high in densification degree, few in defect, stable in structure, high in tensile strength modulus, large in grain size, resistant to high temperature, good in oxidation resistance and creep resistance and the like.
本发明公开了一种含硼耐高温近化学计量比碳化硅纤维及其制备方法，该制备方法包括纺丝阶段、不熔化阶段、预烧结阶段、致密化烧结阶段和氮化阶段，其特征在于：所述不熔化阶段中，将纺丝阶段所得金属掺杂聚碳硅烷原丝纤维依次在含三氯化硼的气氛下进行掺硼反应和在具有碳碳双键的气态碳氢化合物的气氛下进行交联反应。该方法操作简单，生产效率高，生产成本低，易用于大批量工业化生产。制备得到的含硼耐高温近化学计量比碳化硅纤维具有氧含量低，致密化程度高，缺陷少，结构稳定，拉伸强度模量高，晶粒尺寸大，耐高温、抗氧化及抗蠕变性能好等优点。
Boron-containing high-temperature-resistant near-stoichiometric silicon carbide fiber and preparation method thereof
一种含硼耐高温近化学计量比碳化硅纤维及其制备方法
HUANG XIAOZHONG (author) / YI JUN (author) / WU LICONG (author) / XIAO YIFAN (author)
2024-01-09
Patent
Electronic Resource
Chinese
IPC:
C04B
Kalk
,
LIME
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