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Preparation of al by selective laser melting 2 o 3 -gdalo 3 -zro 2 Method for ternary eutectic ceramics

A laser melting and ternary eutectic technology, which is applied in the field of ceramic materials, can solve the problems of difficult forming and coarse sintered structure, and achieve the effects of fast forming speed, high forming freedom and high absorption rate

Active Publication Date: 2022-08-02
NORTHWESTERN POLYTECHNICAL UNIV
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Problems solved by technology

[0010] In order to overcome the shortcomings of difficult forming of ceramic materials and coarse sintered structure in the prior art, the present invention proposes a selective laser melting method for bulk ternary eutectic oxide ceramics

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  • Preparation of al by selective laser melting <sub>2</sub> o <sub>3</sub> -gdalo <sub>3</sub> -zro <sub>2</sub> Method for ternary eutectic ceramics
  • Preparation of al by selective laser melting <sub>2</sub> o <sub>3</sub> -gdalo <sub>3</sub> -zro <sub>2</sub> Method for ternary eutectic ceramics
  • Preparation of al by selective laser melting <sub>2</sub> o <sub>3</sub> -gdalo <sub>3</sub> -zro <sub>2</sub> Method for ternary eutectic ceramics

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Embodiment Construction

[0071] The present invention is a kind of selective laser melting to prepare Al 2 O 3 -Gd 2 O 3 -ZrO 2 The method of ternary eutectic ceramics, the specific process is:

[0072] Step 1, Preparation of Al eutectic composition 2 O 3 -Gd 2 O 3 -ZrO 2 Spherical mixed powder material:

[0073] Weigh Al with a total mass of 400g 2 O 3 Powder, Gd 2 O 3 Powder and ZrO 2 powder; the Al 2 O 3 Powder, Gd 2 O 3 Powder and ZrO 2 The ratio of powder is eutectic molar ratio Al 2 O 3 :Gd 2 O 3 :ZrO 2 =58:19:23.

[0074] Al will be weighed 2 O 3 Powder, Gd 2 O 3 Powder and ZrO 2 The powders were mixed, alcohol and polyvinyl alcohol solution were added, and the above mixture was ball-milled with a ball mill at a rotational speed of 550 rpm for 2 hours to obtain a mixture. The consumption of described alcohol is described Al 2 O 3 Powder, Gd 2 O 3 Powder and ZrO 2 10wt.% of the total mass of the powder, the dosage of the polyvinyl alcohol solution is the Al 2 ...

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Abstract

A selective laser melting method for bulk ternary eutectic oxide ceramics using CO 2 laser selective melting method, and the CO 2 The scanning rate and laser power of the laser selective melting method are controlled within the above ranges, and the melt material in the laser scanning area obtains a greater degree of undercooling and increases the nucleation rate, thereby refining the eutectic structure and improving the mechanical properties of the sample. Preparation of large-sized bulk Al 2 O 3 ‑GdAlO 3 ‑ZrO 2 Eutectic ceramics, prepared by Al 2 O 3 ‑GdAlO 3 ‑ZrO 2 The size of eutectic ceramics reaches 20×18×3.5mm after wire cutting 3 . The scanning rate of the present invention can reach up to 5000mm / s, and the ceramic material is very sensitive to CO 2 The high energy absorption rate of the laser is more conducive to the complete melting and solidification of the oxide ceramic material. At the same time, the laser beam selectively melts and solidifies the powder layer according to the path and parameters set by the computer.

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 ceramics and preparation method thereof. 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 ℃, the yield strength of the ceramic material reaches 690MPa, and the bending strength can be maintained in the range of 500 ~ 600MPa. Change. After thermal exposure at 1700℃ for 500h, the strength is basically unchanged, the solidified structure is not significantly coarsened, and the size, surface roughness and weight of the sample are basically unchanged, indicating that the ceramic material has good oxidation resistance and high temperature structure. Stability and high tempera...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B32B18/00C04B35/50C04B35/64
CPCC04B35/50C04B35/64C04B2235/3217C04B2235/3244C04B2235/665C04B2235/95
Inventor 苏海军申仲琳刘海方赵迪刘园郭一诺郭敏张军刘林傅恒志
Owner NORTHWESTERN POLYTECHNICAL UNIV
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