Method for preparing Al2O3-GdAlO3-ZrO2 ternary eutectic ceramics

Abstract

The invention discloses a method for preparing Al2O3-GdAlO3-ZrO2 ternary eutectic ceramics. The Al2O3-GdAlO3-ZrO2 ternary eutectic ceramic with different shapes and sizes, which are difficult to prepare in the prior art, can be obtained by adopting a laser near net forming method through layered manufacturing / layered stacking. In the preparation of the Al2O3-GdAlO3-ZrO2 ternary eutectic ceramics disclosed by the invention, the upper surface of a sample is scanned in a reciprocating manner by a method of gradually reducing laser power, so that temperature compensation of the Al2O3-GdAlO3-ZrO2 ternary eutectic ceramics in the cooling process is realized, the cooling speed of the sample is retarded, the temperature of the formed sample is gradually reduced, further thermal stress in the cooling process is reduced and the formation of cracks is inhibited. The Al2O3-GdAlO3-ZrO2 ternary eutectic ceramics have high forming speed, and no Mo crucible or Ir crucible with high price is needed, sothat the pollution which is possibly caused by the crucible is avoided and the production cost is reduced; in addition, solidification structures of the obtained Al2O3-GdAlO3-ZrO2 ternary eutectic ceramics are refined by 25 times or above compared with that of a sample structure obtained by Bridgman method; besides, the size of the obtained sample is 2 to 3 times that of a sample obtained by a laser levitation zone melting method, and the application range of the materials is widened.

Description

technical field [0001] The invention relates to the field of laser additive manufacturing of high-performance oxide eutectic ceramic materials, in particular to a laser near-net-shaping method for preparing Al 2 o 3 -GdAlO 3 -ZrO 2 Method for Rod Specimens of Ternary Eutectic Ceramics. Background technique [0002] Al 2 o 3 -GdAlO 3 Eutectic ceramics have excellent high-temperature mechanical properties, outstanding structural thermal stability, and natural oxidation resistance, and are considered to be an ultra-high-temperature structural material for aerospace with wide application potential. Document "Narihito Nakagawa, Hideki Ohtsubo, Atsuyuki Mitani, Kazutoshi Shimizu, Yoshiharu Waku. High temperature strength and thermal stability for melt growthcomposite[J]. Journal of the European Ceramic Society, 2005, 25:1251-1257." Using Bridgeman Φ53mm Al 2 o 3 -GdAlO 3 Eutectic ceramic columnar ingot, and its high temperature mechanical properties were investigated. T...

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Problems solved by technology

[0009] To overcome the current Al 2 o 3 -GdAlO 3 -ZrO 2 The forming process of ternary eutectic ceramics has problems such as long processing cycle, high production cost, and cumbersome procedures. The present invention proposes a method for preparing Al 2 o 3 -GdAlO 3 -ZrO 2 The method of ternary eutectic ceramics

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