研究目的
Investigating the effects of different laser shock times on the CoNiCrAlY bonding layer for surface modification, focusing on high-temperature oxidation resistance and mechanical properties of modified and ordinary coatings.
研究成果
The laser shock strengthening treatment reduces defects in the CoNiCrAlY bonding layer and the non-uniformity of the TC/BC interface. The average cross-section hardness of the coatings after laser impact is greater than that of ordinary coating. The modified coatings form a dense and complete TGO film better than ordinary coating, improving high-temperature oxidation resistance. The residual stress in TGO is compressive, increasing first and then decreasing with oxidation time.
研究不足
The study focuses on the effects of laser shock on the CoNiCrAlY bonding layer and does not explore other potential surface modification techniques. The research is limited to high-temperature oxidation resistance and mechanical properties, without considering other possible failure mechanisms.
1：Experimental Design and Method Selection:
Atmospheric plasma spraying was used for the preparation of a CoNiCrAlY bonding layer on a nickel-based superalloy with different laser shock times designed for surface modification. Electron-beam physical vapor deposition was used to deposit a ceramic layer to form a new modified coating.
2：Sample Selection and Data Sources:
A sample made of GH4169 nickel-based superalloy was used as the base material. The bonding layer was made of CoNiCrAlY, and the ceramic layer is 7–8% yttrium (III) oxide–zirconium dioxide.
3：List of Experimental Equipment and Materials:
FEI Nova Nano 450 field-emission scanning electron microscope (SEM), KB30S-FA fully automatic microhardness tester, SX2 box-type resistance furnace, DXR laser Raman spectroscopy.
4：Experimental Procedures and Operational Workflow:
The substrate was degreased, sandblasted, and cleaned. A CoNiCrAlY bonding layer was sprayed onto it using APS. Laser shock was used to strengthen the surface of the CoNiCrAlY bonding layer. The ceramic layer was deposited using electron-beam physical vapor deposition.
5：Data Analysis Methods:
The hardness test of coatings was carried out using a microhardness tester. The high-temperature oxidation resistance test was carried out in a box-type resistance furnace. The residual stress of coatings after the oxidation experiment was determined by Raman spectroscopy.
独家科研数据包，助您复现前沿成果，加速创新突破
获取完整内容
