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Preparation method of SiB6 modified self-healing SiCf/SiC composite material
The invention belongs to the technical field of preparation of ceramic matrix composite materials, and particularly relates to a preparation method of a SiB6 modified self-healing SiCf/SiC composite material. According to the invention, SiB6 self-healing components are uniformly dispersed and distributed in a matrix; under an oxidation condition, an oxidation reaction is carried out at a micro-crack of a matrix to generate glass-phase B2O3, so that the interior of the material is protected from being invaded by an oxidizing medium, and the influence of inherent defects such as pores and cracksin the composite material on the high-temperature service life of the material is solved; due to the good high-temperature oxidation resistance of SiB6, the high-temperature oxidation resistance of the prepared SiCf/SiC composite material is greatly improved. SiB6 is subjected to an oxidation reaction at a high temperature to generate B2O3 and SiO2 at the same time, the melting point is increasedthrough the borosilicate glass phase, no other gas by-products are generated, and cracks can be effectively healed; siB6 has excellent mechanical properties, and SiB6 and SiC have matched thermal expansion coefficients, so that the mechanical properties of the modified material are only reduced to a small extent.
本发明属于陶瓷基复合材料制备技术领域，具体涉及一种SiB改性的自愈合SiC/SiC复合材料制备方法；本发明目的将SiB自愈合组元均匀弥散分布在基体中，氧化条件下在基体微裂纹处发生氧化反应生成玻璃相BO，从而保护材料内部不受氧化介质侵犯，解决该复合材料中由于固有的孔隙及裂纹等缺陷对材料高温使用寿命的影响；由于SiB较好的高温抗氧化性使得所制备SiC/SiC复合材料的高温抗氧化性能大幅度提升。高温下SiB发生氧化反应生成BO的同时还生成SiO，该硅硼玻璃相使得熔点升高，同时无其他气体副产物生成，能够有效地愈合裂纹；SiB具有优异的力学性能，同时SiB与SiC具有匹配的热膨胀系数，因此经改性后的材料力学性能仅有小幅度下降。
Preparation method of SiB6 modified self-healing SiCf/SiC composite material
The invention belongs to the technical field of preparation of ceramic matrix composite materials, and particularly relates to a preparation method of a SiB6 modified self-healing SiCf/SiC composite material. According to the invention, SiB6 self-healing components are uniformly dispersed and distributed in a matrix; under an oxidation condition, an oxidation reaction is carried out at a micro-crack of a matrix to generate glass-phase B2O3, so that the interior of the material is protected from being invaded by an oxidizing medium, and the influence of inherent defects such as pores and cracksin the composite material on the high-temperature service life of the material is solved; due to the good high-temperature oxidation resistance of SiB6, the high-temperature oxidation resistance of the prepared SiCf/SiC composite material is greatly improved. SiB6 is subjected to an oxidation reaction at a high temperature to generate B2O3 and SiO2 at the same time, the melting point is increasedthrough the borosilicate glass phase, no other gas by-products are generated, and cracks can be effectively healed; siB6 has excellent mechanical properties, and SiB6 and SiC have matched thermal expansion coefficients, so that the mechanical properties of the modified material are only reduced to a small extent.
本发明属于陶瓷基复合材料制备技术领域，具体涉及一种SiB改性的自愈合SiC/SiC复合材料制备方法；本发明目的将SiB自愈合组元均匀弥散分布在基体中，氧化条件下在基体微裂纹处发生氧化反应生成玻璃相BO，从而保护材料内部不受氧化介质侵犯，解决该复合材料中由于固有的孔隙及裂纹等缺陷对材料高温使用寿命的影响；由于SiB较好的高温抗氧化性使得所制备SiC/SiC复合材料的高温抗氧化性能大幅度提升。高温下SiB发生氧化反应生成BO的同时还生成SiO，该硅硼玻璃相使得熔点升高，同时无其他气体副产物生成，能够有效地愈合裂纹；SiB具有优异的力学性能，同时SiB与SiC具有匹配的热膨胀系数，因此经改性后的材料力学性能仅有小幅度下降。
Preparation method of SiB6 modified self-healing SiCf/SiC composite material
一种SiB改性的自愈合SiC/SiC复合材料制备方法
ZHOU YIRAN (author) / JIAO JIAN (author) / JIANG ZHUOYU (author) / LYU XIAOXU (author) / LIU HU (author) / YANG JINHUA (author) / QI ZHE (author) / GAO YE (author)
2020-07-14
Patent
Electronic Resource
Chinese
IPC:
C04B
Kalk
,
LIME
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