Infrared heat shielding type rare earth hafnate-based composite ceramic coating material and preparation method thereof
By introducing spinel-structured oxide dispersed phases into rare earth hafnium-based ceramic materials, an infrared heat-shielding composite ceramic coating was prepared, solving the problem that rare earth hafnium-based ceramics do not shield against infrared thermal radiation, and realizing a ceramic coating material with low thermal conductivity and high infrared heat shielding performance.
Patent Information
- Application Number
- CN202411468448.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-21
- Publication Date
- 2025-11-21
- Estimated Expiration
- 2044-10-21
AI Technical Summary
Existing rare earth hafnium salt ceramic materials do not have a shielding effect against infrared thermal radiation, which causes the thermal barrier coating to be penetrated by infrared thermal radiation at high temperatures, and the metal substrate is directly heated by radiation, reducing the service life of the coating material.
Infrared heat shielding composite ceramic coating materials were prepared by introducing spinel-structured oxides as dispersed phases into rare earth hafnium salt-based phases. The high infrared absorption and emissivity of the dispersed phases were utilized, and the distribution and size of the dispersed phases were controlled by solid-state sintering to enhance the infrared heat shielding performance.
It achieves low thermal conductivity (less than 2 W/(m·K) in the 25-800℃ range, high infrared emissivity (greater than 0.85) in the 2.5-14μm band, high absorptivity (greater than 0.8) in the 200-2500nm band, and low transmittance (less than 0.002) in the 400-2500nm band, thereby improving the infrared thermal shielding performance and stability of the material.