A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Carbon/carbon composite material surface long-life ultra-high temperature cycle ablation resistant coating and preparation method thereof
The invention provides a carbon/carbon composite material surface long-life ultra-high temperature cycle ablation resistant coating and a preparation method thereof. The problems that a coating is narrow in ablation resistant temperature range, poor in cycle thermal shock resistance and difficult to reuse are solved. The coating is (Hf, Zr) C-La2O3, and due to the addition of La2O3, the conversion of HfO2, ZrO2 and (Hf, Zr) O2 oxides from tetragonal phase to monoclinic phase can be inhibited, part of tetragonal phase is retained, and cracks and even shedding caused by phase change are weakened, so that the ablation resistance of the (Hf, Zr) C coating is improved. In addition, the melting point of La2O3 is lower than the ablation temperature, and the phase is in a molten state in the ablation process. A proper amount of La2O3 not only can be used as a molten phase to heal cracks and pores in the coating, but also can be subjected to a solid solution reaction with (Hf, Zr) O2 to form a La-doped (Hf, Zr) O2 oxide film with a compact structure, the surface of the coating is further densified, oxygen permeation can be effectively blocked in the ablation process, and phase change of the oxide film is inhibited.
本发明提出了一种碳/碳复合材料表面长寿命抗超高温循环烧蚀涂层及其制备方法，解决了涂层抗烧蚀温度范围较窄且抗循环热冲击性能较差以及难以重复使用的问题。该涂层为(Hf,Zr)C‑La2O3，其中的La2O3的添加可抑制HfO2、ZrO2和(Hf,Zr)O2氧化物由四方相向单斜相的转变，保留部分四方相，削弱因相变引起的裂纹甚至是脱落，从而提高(Hf,Zr)C涂层抗烧蚀性能。此外，La2O3熔点低于烧蚀温度，该相在烧蚀过程中处于熔融状态。适量的La2O3不仅可作为熔融相愈合涂层中的裂纹和孔隙，还可与(Hf,Zr)O2固溶反应形成具有致密结构的La掺入的(Hf,Zr)O2氧化膜，进一步致密化涂层表面，能在烧蚀过程中有效阻挡氧气渗透，抑制氧化膜的相变。
Carbon/carbon composite material surface long-life ultra-high temperature cycle ablation resistant coating and preparation method thereof
The invention provides a carbon/carbon composite material surface long-life ultra-high temperature cycle ablation resistant coating and a preparation method thereof. The problems that a coating is narrow in ablation resistant temperature range, poor in cycle thermal shock resistance and difficult to reuse are solved. The coating is (Hf, Zr) C-La2O3, and due to the addition of La2O3, the conversion of HfO2, ZrO2 and (Hf, Zr) O2 oxides from tetragonal phase to monoclinic phase can be inhibited, part of tetragonal phase is retained, and cracks and even shedding caused by phase change are weakened, so that the ablation resistance of the (Hf, Zr) C coating is improved. In addition, the melting point of La2O3 is lower than the ablation temperature, and the phase is in a molten state in the ablation process. A proper amount of La2O3 not only can be used as a molten phase to heal cracks and pores in the coating, but also can be subjected to a solid solution reaction with (Hf, Zr) O2 to form a La-doped (Hf, Zr) O2 oxide film with a compact structure, the surface of the coating is further densified, oxygen permeation can be effectively blocked in the ablation process, and phase change of the oxide film is inhibited.
本发明提出了一种碳/碳复合材料表面长寿命抗超高温循环烧蚀涂层及其制备方法，解决了涂层抗烧蚀温度范围较窄且抗循环热冲击性能较差以及难以重复使用的问题。该涂层为(Hf,Zr)C‑La2O3，其中的La2O3的添加可抑制HfO2、ZrO2和(Hf,Zr)O2氧化物由四方相向单斜相的转变，保留部分四方相，削弱因相变引起的裂纹甚至是脱落，从而提高(Hf,Zr)C涂层抗烧蚀性能。此外，La2O3熔点低于烧蚀温度，该相在烧蚀过程中处于熔融状态。适量的La2O3不仅可作为熔融相愈合涂层中的裂纹和孔隙，还可与(Hf,Zr)O2固溶反应形成具有致密结构的La掺入的(Hf,Zr)O2氧化膜，进一步致密化涂层表面，能在烧蚀过程中有效阻挡氧气渗透，抑制氧化膜的相变。
Carbon/carbon composite material surface long-life ultra-high temperature cycle ablation resistant coating and preparation method thereof
碳/碳复合材料表面长寿命抗超高温循环烧蚀涂层及其制备方法
ZHANG YULEI (author) / LI JIACHEN (author) / LU FANYU (author) / LI TAO (author) / LYU JUNSHUAI (author) / LI HEJUN (author)
2024-05-14
Patent
Electronic Resource
Chinese
IPC:
C04B
Kalk
,
LIME
| European Patent Office | 2015
| European Patent Office | 2022
High-temperature-resistant anti-ablation composite coating and preparation method thereof
| European Patent Office | 2022
| European Patent Office | 2016