Method for preparing cylindrical Al2O3-GdAlO3 binary eutectic ceramic through selective laser melting

Abstract

The invention relates to a method for preparing cylindrical Al2O3-GdAlO3 binary eutectic ceramic through selective laser melting. The method is characterized in that the cylindrical Al2O3-GdAlO3 binary eutectic ceramic is obtained by using a CO2 laser through a selective laser melting method, the size of the Al2O3-GdAlO3 binary eutectic ceramic is phi 20 * 2 millimeters <3>, the obtained eutectic ceramic is fine and compact in microstructure and presents a typical mutually-intertwined three-dimensional network eutectic solidification structure morphology, a melt material in a laser scanning area obtains a higher degree of supercooling and increases the nucleation rate, so that the eutectic structure is refined, and the mechanical property of a sample is improved. According to the method, the maximum scanning rate can reach 5000 mm / s, the energy absorption rate is high by selecting the CO2 laser, complete melting and solidification forming of the oxide ceramic material are better facilitated, the cylindrical sample with a curved surface structure can be prepared, the potential of one-step rapid forming of the large-size solidification eutectic ceramic sample with a complex shape is achieved, through a subsequent optimization process, the large-size Al2O3-GdAlO3 eutectic ceramic sample with higher quality is expected to be prepared.

Description

technical field

[0001] The invention relates to the field of ceramic materials, in particular to a cylindrical Al 2 o 3 -GdAlO 3 Binary eutectic ceramics and methods for their preparation. Background technique

[0002] Experiments confirm that Al prepared by directional solidification technology 2 o 3 -GdAlO 3 Eutectic ceramics have excellent high-temperature strength, oxidation resistance, creep resistance and high-temperature structural stability. For example, from room temperature to 1600°C, the yield strength of this ceramic material reaches 690MPa, and the bending strength can be maintained in the range of 500-600MPa with almost no Change. After 500 hours of heat exposure in the atmosphere at 1700°C, the strength remained basically unchanged, the solidification structure did not significantly coarsen, and the sample size, surface roughness and weight basically did not change, indicating that the ceramic material has good oxidation resistance and high temperature s...

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