Method for preparing Al2O3-GdAlO3-ZrO2 ternary eutectic ceramic by selective laser melting

Abstract

A selective laser melting method of blocky ternary eutectic oxide ceramic adopts a CO2 laser selective melting method, the scanning rate and the laser power of the CO2 laser selective melting method are controlled within ranges shown in the specification, and a melt material in a laser scanning area obtains higher supercooling degree, the nucleation rate is increased, so that the eutectic structure is refined, and the mechanical properties of a sample is improved. The large-size blocky Al2O3-GdAlO3-ZrO2 eutectic ceramic is obtained through preparation, and the size of the prepared Al2O3-GdAlO3-ZrO2 eutectic ceramic reaches 20*18*3.5 mm<3> after the Al2O3-GdAlO3-ZrO2 eutectic ceramic is subjected to linear cutting. The scanning rate can reach 5000 mm / s at most, the energy absorption rate ofthe ceramic material to a CO2 laser is high, and complete melting and solidification forming of the oxide ceramic material are better facilitated. Meanwhile, a laser beam selectively melts and solidifies a powder layer according to a path and parameters set by a computer, layer-by-layer stacking is carried out, and a solidified eutectic ceramic sample with a large size and a complex shape can beprepared.

Description

technical field

[0001] The invention relates to the field of ceramic materials, in particular to a bulk Al 2 o 3 -GdAlO 3 -ZrO 2 Ternary eutectic ceramic and its preparation method. 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 structu...

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