Plasma spraying thermal barrier coating yttrium oxide stabilized zirconia coating
aerospace power engine parts
Plasma spraying thermal barrier coating yttrium oxide stabilized zirconia coating
aerospace power engine parts
Plasma spraying technology of thermal barrier coating
1-- Thermal barrier coating is widely used in aero-engines and ground gas turbines to protect high-temperature parts of engines, such as combustor, turbine blade, flame nozzle, etc., which can greatly improve component life, improve engine efficiency, reduce component temperature or increase gas temperature.
2-- The preparation methods of thermal barrier coating mainly include plasma spraying and electron beam physical vapor deposition. Thermal impact life and thermal conductivity are two key technical indexes of thermal barrier coatings. Without excellent thermal shock resistance, THERMAL barrier coatings cannot be successfully applied in aeroengines with high reliability requirements. The key to successful application of thermal spray coating in commercial aircraft engines is to achieve thousands or tens of thousands of hours of coating life.
3-- Due to yttrium stabilized zirconia working above 1200℃, phase transformation in the subsequent cooling process, the material volume will expand about 4% during the phase transformation process, this volume effect causes cracks and even spalling of the coating. Researchers at home and abroad have carried out more studies on the multiple system of composite stabilization of zirconia with two or more rare earth oxides and made remarkable progress. The ternary rare earth composite stabilization of zirconia with gadolinium oxide, ytterbium oxide and yttrium oxide developed by American scientists can work at 1500℃ and has been commercialized.
4-- The multi-element rare earth oxide composite stabilized zirconia ultra-high temperature thermal barrier coating developed by the Key Laboratory of High-energy Beam Processing Technology of MANUFACTURING Institute has excellent thermal insulation performance and thermal impact resistance. It works at 1500℃ for a long time and has no harmful phase change in the subsequent cooling process. The use temperature reaches the international advanced level.
5-Thermal spraying technology after more than 100 years of development, increasingly mature technology, applications involved in aerospace, industrial gas turbine, automobile, electric power, fuel cell and solar energy, medical and health, paper making and printing and many other fields
