Abstract
Alumina ceramics with different sintering temperatures in argon atmosphere were obtained using stereolithography-based 3D printing. The effects of sintering temperature on microstructure and physical and mechanical properties were investigated. The results show that the average particle size, shrinkage, bulk density, crystallite size, flexural strength, Vickers hardness, and nanoindentation hardness increased with the increase in sintering temperature, whereas the open porosity decreased with increasing sintering temperature. No change was observed in phase composition, chemical bond, atomic ratio, and surface roughness. For the sintered samples, the shrinkage in Z direction is much greater than that in X or Y direction. The optimum sintering temperature in argon atmosphere is 1350 °C with a shrinkage of 3.0%, 3.2%, and 5.5% in X, Y, and Z directions, respectively, flexural strength of 26.7 MPa, Vickers hardness of 198.5 HV, nanoindentation hardness of 33.1 GPa, bulk density of 2.5 g/cm3, and open porosity of 33.8%. The optimum sintering temperature was 70 °C higher than that sintering in air atmosphere when achieved the similar properties.
Highlights
Turbine blade designers and manufacturers aim to continuously improve the cooling structure and efficiency of blades, and one of the key technologies is theJ Adv Ceram 2020, 9(2): 220–231 capability
As the sintering temperature was increased to 1200 °C, the increased sintering driving force promoted the bonding of layers together, decreasing the interlayer spacing
The results show that the average particle size, shrinkage, bulk density, crystallite size, flexural strength, Vickers hardness, and nanoindentation hardness increased with the increasing sintering temperature
Summary
Turbine blade designers and manufacturers aim to continuously improve the cooling structure and efficiency of blades, and one of the key technologies is theJ Adv Ceram 2020, 9(2): 220–231 capability. Ceramic components prepared using stereolithography 3D printing technology usually have a higher shrinkage and easy to crack [10]. Chen et al [11] prepared cordierite ceramic parts with a shrinkage of 33.7%–60.8% using stereolithography-based 3D printing method and found that distinct features of cracks are demonstrated on different surfaces of asprinted samples. Liu et al [12] fabricated zirconia-based ceramics using stereolithography with a shrinkage of 20.0%–22.4% for the sintered samples. He et al [13] fabricated complex-shaped zirconia ceramic parts via stereolithography with a shrinkage of 35.3%. Many studies have been conducted to improve the 3D printing technology, the shrinkage of ceramic is still very large
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