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161.
铝基厚梯度热障涂层制备工艺及性能研究 总被引:1,自引:0,他引:1
采用单一等离子喷涂法和超音速火焰喷涂与等离子喷涂复合喷涂法在铝质LY12基体上制蔷了总厚度分别为0.6mm、10mm和2.0mm的梯度热障涂层,并对基体界面处的涂层显微结构特征进行了金相组织和扫描电镜(SEM)观察,试验结果表明,采用复合喷涂法制备的2mm厚梯度热障涂层其抗拉强度得到显著提高.达到36MPa.其主要原因是采甩JP5000喷涂粘结底层很好的改善了铝基体与游层之间的界面结合强度。基体界面结合强度高低与两者的紧密接触程度有关。 相似文献
162.
《Ceramics International》2023,49(7):10525-10534
Thermal barrier coatings are an effective technology for improving the high-temperature performance of hot section components in gas turbine engine. Due to their excellent properties, high-entropy oxides are considered to be promising materials for thermal barrier coatings. Laser cladding is a coating preparation technology and the top coat prepared by laser cladding technology has an important application value for thermal barrier coatings. In this work, to improve the thermal cycling behavior of the La2(Ti0.2Zr0.2Sn0.2Ce0.2Hf0.2)2O7 high-entropy oxide coating, a bi-layer coating with the La2(Ti0.2Zr0.2Sn0.2Ce0.2Hf0.2)2O7 high-entropy oxide layer and the YSZ layer was designed and fabricated by laser cladding on the NiCoCrAlY alloy surface. The microstructure, phase and mechanical properties of the coating were analyzed by X-ray diffraction, scanning electron microscopy, energy dispersive spectroscopy, and micro-hardness and nanoindentation tests, respectively. The results show that a bi-layer La2(Ti0.2Zr0.2Sn0.2Ce0.2Hf0.2)2O7/YSZ coating was successfully prepared by the laser cladding method, and shows good bonding at the interface between the layers. The high-entropy oxide layer maintains a relatively stable defective fluorite structure and its microstructure exists in the stable cellular and dendrite crystalline state after laser cladding. The high-entropy oxide layer prepared by laser cladding showed an average elastic modulus of 167 GPa and an average hardness of 1022.8HV in nanoindentation tests. Thermal cycling of the coating was carried out at 1050 °C. Failure of the bi-layer coating occurred after 60 thermal cycles at 1050 °C. Thermal stresses between different layers are calculated during thermal cycling. Due to its excellent mechanical properties, the bi-layer coating with the La2(Ti0.2Zr0.2Sn0.2Ce0.2Hf0.2)2O7 high-entropy oxide and YSZ layers is expected to become an effective high-entropy oxide thermal barrier coating. 相似文献
163.
《Journal of the European Ceramic Society》2023,43(3):1141-1146
In this paper, a series of high-entropy rare earth niobates, including fluorite RE3NbO7 (HE317), monoclinic RENbO4 (HE114) and RENbO4/RE3NbO7 composite (HE-composite), are prepared via solid state reaction, following by a study about their thermal and mechanical properties. The high-entropy rare earth niobates exhibit excellent phase stability after thermally exposed to 1300 °C for 100 h, indicating entropy can stabilized high-entropy rare earth niobates. Compared with the single element rare earth niobates, high-entropy rare earth niobates have higher fracture toughness and hardness. The high-entropy RENbO4/RE3NbO7 composite has the best mechanical properties, with a fracture toughness of 2.71 ± 0.17 MPa·m1/2 and hardness of 9.46 ± 0.24 GPa, respectively. The high-entropy niobates exhibit high coefficients of thermal expansion which is close to 7 wt% Y2O3 stabilized ZrO2. It is also proved that the configurational entropy has little effect on the critical temperature from monoclinic to tetragonal phase transition. The thermal conductivity of HE-composite is lower than HE114, indicating the combination of HE114 and H317 is a more efficient strategy to decrease the thermal conductivity of HE114 than entropy engineering. 相似文献