Preparation of BSAS Powders and Its Effect on Properties of Coatings
JIAO Chun-rong1,2, JIAO Jian1, CHEN Da-ming2, WANG Ling1,2
1. Composites Center, Aviation Industry Corporation of China, Beijing 101300, China;
2. Science and Technology on Advanced Composites Laboratory, Beijing Institute of Aeronautical Materials, Beijing 100095, China
Abstract：BSAS (BaO-SrO-Al2O3-SiO2) powders were prepared by different methods. The characteristics of the powders, their effect on the structures and properties of the plasma-sprayed environmental barrier coatings (EBC) were analyzed. The results show that BSAS powders prepared by powder granulation process have uneven particles and poor fluidity, and the coatings prepared by this method have rough surface and high porosity structure with bonding strength of 24.1MPa. BSAS powders prepared by agglomerate sintered method have smooth surface, good fluidity and high deposition efficiency, while the coating prepared has an uniform structure with few pores and no cracks with the bonding strength up to 29.8MPa and BSAS phase retention rate is 53.2% after spraying,which is the highest among the three kinds of powders. BSAS particles prepared by fused crushed method are dense and irregular, good liquidity and high deposition efficiency, and the coatings prepared by this powders are smooth with very few pores, but there are lots of micro-cracks, and the bonding strength is only 14.2MPa. The coating phase is restructured after spraying, and the BSAS phase retention rate is 20.5%, which can decrease the properties of the coatings at high temperatures. Results show that the agglomerate sintered method simplifies the preparing process of the spraying powders, and by this method, BSAS powders of excellent quality and high phase stability can be produced. Compared with other methods, BSAS powders prepared by agglomerate sintered method is more suitable for plasma spraying.
焦春荣, 焦健, 陈大明, 王岭. BSAS喷涂粉体制备工艺及其对涂层性能的影响[J]. 材料工程, 2016, 44(8): 51-57.
JIAO Chun-rong, JIAO Jian, CHEN Da-ming, WANG Ling. Preparation of BSAS Powders and Its Effect on Properties of Coatings. Journal of Materials Engineering, 2016, 44(8): 51-57.
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