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

A laser melting and ternary eutectic technology, applied in the field of ceramic materials, can solve the problems of coarse sintered structure and difficult forming

Active Publication Date: 2021-03-05
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

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

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Embodiment Construction

[0071] The invention is a selective laser melting preparation Al 2 o 3 -Gd 2 o 3 -ZrO 2 The method of ternary eutectic ceramics, the specific process is:

[0072] Step 1, prepare Al of 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 proportion of powder is eutectic molar ratio Al 2 o 3 :Gd 2 o 3 :ZrO 2 = 58:19:23.

[0074] Al to be weighed 2 o 3 Powder, Gd 2 o 3 Powder and ZrO 2 The powders were mixed and alcohol and polyvinyl alcohol solutions were added, and the above mixture was ball milled for 2 hours at a speed of 550 rpm using a ball mill 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 powder mass, the amount of the polyvinyl alcohol solution is the Al 2 o 3 Powder, Gd 2 o 3 Powd...

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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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Application Information

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IPC IPC(8): C04B35/50C04B35/64
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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