Effect of Pressure Infiltration on Properties of 3D Printed Al2O3 Ceramics
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摘要: 使用氧化铝浆料对预烧结后的3D打印氧化铝坯体进行加压渗透处理，再进行烧结，研究了渗透压力和渗透浆料固含量对陶瓷相对密度和抗压性能的影响。结果表明：加压渗透显著改善了陶瓷的相对密度，且渗透压力越大，坯体的相对密度越大；随渗透浆料固含量增加，直径1.0，1.5 cm陶瓷烧结试样的相对密度逐渐增大，直径2.0 cm陶瓷烧结试样的相对密度则先升高后降低；低固含量的渗透浆料有助于提高大直径陶瓷烧结试样的相对密度，高固含量的浆料则适用于小直径陶瓷试样；渗透后3D打印陶瓷的抗弯强度较未渗透的提高10倍以上；随浆料固含量增加，陶瓷试样的抗弯强度先增加，当浆料固含量（体积分数）达到40%以上时，抗弯强度不再发生明显变化。Abstract: The pre-sintered 3D printed Al2O3 green body was subjected to pressure infiltration treatment with Al2O3 slurry, and then sintered. The effects of infiltration pressure and solid content of infiltration slurry on the relative density and compressive properties of ceramics were studied. The results show that the pressure infiltration significantly improved the relative density of 3D printed ceramics, and the greater the infiltration pressure, the greater the relative density of the green body. The relative density of the ceramic sintered samples with diameters of 1.0 cm and 1.5 cm gradually increased with the infiltrated slurry solid content, and the relative density of the ceramic sintered samples with a diameter of 2.0 cm increased first and then decreased. The infiltrating slurry with relatively low solid content was more helpful to increase the relative density of ceramic sintered samples with relatively large diameters, and the slurry with relatively high solid content was more suitable for ceramic samples with relatively small diameters. The bending strength of the 3D printed ceramics after infiltration was more than 10 times higher than that of uninfiltrated ceramics. As the solid content of the slurry increased, the bending strength of ceramic samples increased first. When the solid content (volume fraction) of the slurry reached more than 40%, the bending strength no longer changed significantly.
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Keywords:
- 3D printing /
- pressure penetration /
- porous ceramic /
- densification
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