Engine is the most important part of the space shuttle. The use of abradable seal coating make substantial improvements to the space shuttle engine gas path closed, improving overall efficiency and performance of the engine, extended service life and abradable seal coating research and application has become an important topic in the field of the world’s aerospace.Paper introduced and compared analysis various of gas road closed technology, and make a briefly introduction about abradable seal coating in recent years both at home and abroad, focuses on components material of abradable seal coating and eventually determine the components and ratio, abradable seal coating as sacrificed coating, performance both meet wearness, and having strength hardness against outside rushed corrosion, to meet this pair contradictions of performance.the paper design three species of ZrO2 ceramic-based abradable seal coating, One contains Al2O3, polyphenyl ester(PHB) as well as h-BN the three components, contain a poly-phenyl(PHB), and h-BN of two components, the other contains Al2O3, and polyphenylene ester(PHB) the two components.Using two granulation and plasma processing technology prepare reunion for spraying, study results showed that two times of spray-dried powder provide high density, powder dimensions, structural stability, and a good degree of plasma, density of the powder is better, surface finish improved significantly, liquidity could improve. Particle size analysis showed that the powder size meet spraying requirements, and is suitable for plasma spraying.Using atmospheric plasma spraying on the 321 stainless steel specimens produced three kinds of coating, analysis showed that abradable seal coating with a typical plasma spraying of lamellar structure, which is not inc lusive particle, polyphenyl ester left burning such as pores and cracks. Section analysis showed that the coating section has hierarchy. Phase analysis showed that the coating still exist in poly-phenyl esters which can be used to provide blowhole. Basic performance analysis showed that coating which includes Al2O3 and h-BN has a better performance.Thermal shock cycle test is done under 800 degrees. Test results showed that containing h-BN benefits for thermal shock resistance. Thermal shock analysis shows that thawing of lamellar structure under thermal stress cracks and expands will cause failure under impact, cracking of ceramic coating and adhesive layer is caused by the different thermal expansion coefficients of thermal mismatch coating cracking and Al2O3 phase transitions volume changes result in the coating cracking.Two angle are used on erosion resistance of coating surface test, test results show that the densification of coating benefits for resistance to external erosion. Erosion failure mechanism analysis shows that two failure mechanism of the he erosion failure accelerated to exfoliating and fracture of the coating. Using ceramic balls grinding test of friction and wear properties of coatings, tests showed that three coating has a certain degree of wear, and after adding the Hexagonal Boron Nitride, not only can wear performance enhancing, and grinding size, conducive to operating conditions on the overall protection of the engine. |