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Si-B-C gradient anti-oxidation coating of carbon/carbon composite material and preparation method of Si-B-C gradient anti-oxidation coating
The invention relates to a Si-B-C gradient anti-oxidation coating of a carbon/carbon composite material and a preparation method. A self-healing coating is composed of SiC and B4C phases, has a gradient structure, and comprises a boron-rich layer, a transition layer and a silicon-rich layer from inside to outside; a Si-B-C coating with different B contents is deposited by adopting a chemical vapor deposition method, so that the gradient coating is successfully prepared on the surface of the C/C composite material. The invention aims to improve the oxidation resistance of the coating in a wide temperature range. The coating has the advantages of low reaction temperature and small damage to fibers; the bonding capacity of the coating and a matrix is good; in a low-temperature area of 700-1000 DEG C, boron oxide glass is generated on the inner boron-rich layer, and oxygen is prevented from entering the coating; in a high-temperature region of 1000-1300 DEG C, the outer silicon-rich layer generates a borosilicate glass phase, volatilization of boron oxide on the inner layer is prevented, the C/C composite material is protected at the same time; and thus, oxidation protection of the C/C composite material in a wide temperature range is achieved. The preparation method has the advantages of simple technological process, short experimental period and high experimental efficiency; and the coating has good oxidation resistance in a wide temperature range and the like.
本发明涉及一种碳/碳复合材料的Si‑B‑C梯度抗氧化涂层及制备方法，由SiC和B4C相构成自愈合涂层，具有梯度结构，从内到外分别为富硼层、过渡层、富硅层；通过采用化学气相沉积法沉积不同B含量的Si‑B‑C涂层，成功在C/C复合材料表面制备了梯度涂层。其目的是为了提高涂层在宽温域下的抗氧化性能。本发明具有反应温度低，对纤维损伤小；涂层和基体结合能力较好，在700‑1000℃低温区，内层富硼层生成氧化硼玻璃，阻止氧气的进入；在1000‑1300℃高温区，外层富硅层生成硼硅酸盐玻璃相，阻止内层氧化硼的挥发的同时保护C/C复合材料，实现在宽温域下对C/C复合材料的氧化防护。且工艺过程简单，实验周期短，实验效率高；涂层在宽温域下抗氧化性能好等优点。
Si-B-C gradient anti-oxidation coating of carbon/carbon composite material and preparation method of Si-B-C gradient anti-oxidation coating
The invention relates to a Si-B-C gradient anti-oxidation coating of a carbon/carbon composite material and a preparation method. A self-healing coating is composed of SiC and B4C phases, has a gradient structure, and comprises a boron-rich layer, a transition layer and a silicon-rich layer from inside to outside; a Si-B-C coating with different B contents is deposited by adopting a chemical vapor deposition method, so that the gradient coating is successfully prepared on the surface of the C/C composite material. The invention aims to improve the oxidation resistance of the coating in a wide temperature range. The coating has the advantages of low reaction temperature and small damage to fibers; the bonding capacity of the coating and a matrix is good; in a low-temperature area of 700-1000 DEG C, boron oxide glass is generated on the inner boron-rich layer, and oxygen is prevented from entering the coating; in a high-temperature region of 1000-1300 DEG C, the outer silicon-rich layer generates a borosilicate glass phase, volatilization of boron oxide on the inner layer is prevented, the C/C composite material is protected at the same time; and thus, oxidation protection of the C/C composite material in a wide temperature range is achieved. The preparation method has the advantages of simple technological process, short experimental period and high experimental efficiency; and the coating has good oxidation resistance in a wide temperature range and the like.
本发明涉及一种碳/碳复合材料的Si‑B‑C梯度抗氧化涂层及制备方法，由SiC和B4C相构成自愈合涂层，具有梯度结构，从内到外分别为富硼层、过渡层、富硅层；通过采用化学气相沉积法沉积不同B含量的Si‑B‑C涂层，成功在C/C复合材料表面制备了梯度涂层。其目的是为了提高涂层在宽温域下的抗氧化性能。本发明具有反应温度低，对纤维损伤小；涂层和基体结合能力较好，在700‑1000℃低温区，内层富硼层生成氧化硼玻璃，阻止氧气的进入；在1000‑1300℃高温区，外层富硅层生成硼硅酸盐玻璃相，阻止内层氧化硼的挥发的同时保护C/C复合材料，实现在宽温域下对C/C复合材料的氧化防护。且工艺过程简单，实验周期短，实验效率高；涂层在宽温域下抗氧化性能好等优点。
Si-B-C gradient anti-oxidation coating of carbon/carbon composite material and preparation method of Si-B-C gradient anti-oxidation coating
一种碳/碳复合材料的Si-B-C梯度抗氧化涂层及制备方法
ZHANG YULEI (author) / GE WENHAN (author) / ZHANG PENGFEI (author) / CHEN GUOHUI (author) / KONG JING'AN (author)
2022-01-18
Patent
Electronic Resource
Chinese
IPC:
C04B
Kalk
,
LIME
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