光敏树脂粘结剂喷射增材制造ZrO_(2)工艺及后处理研究

Study on Photosensitive Resin Binder Jetting Additive Manufacturing Process of ZrO_(2) and Post-Processing

对光敏树脂粘结剂喷射增材制造ZrO_(2)坯体的工艺进行了研究。通过喷射光敏树脂粘结剂,紫外光源诱发光敏树脂交联粘结ZrO_(2)粉末形成坯体,具有足够的强度,无需进行热固化即可直接进行后处理。然后将坯体分别在1200、1400、1600℃下进行空气气氛烧结,脱除固化的光敏树脂可实现粉末颗粒间的烧结成型,研究了铺粉层厚和烧结温度对坯体、烧结件的尺寸精度、相对密度、显气孔率、相成分和力学性能的影响。结果表明:随着铺粉层厚的增大,光敏树脂粘结剂的扩散效应导致坯体尺寸精度变差,坯体的相对密度下降,显气孔率上升,压缩强度降低。随着烧结温度的升高,烧结件收缩变大,相对密度变大,相成分保持不变,力学性能相较于烧结前有了很大的提升。100μm铺粉层厚的成形坯体在1600℃烧结4 h后获得的各项参数均最佳,相对密度为57%,显气孔率为21.4%和压缩强度为62.9 MPa。

The process of photoresensitive resin binder jetting additive manufacturing ZrO_(2) green part was investigated.By jetting the photoresensitive resin binder, the UV light source induced the photoresensitive resin cross-linking and bonded ZrO_(2) powder, and the green part was formed, which had sufficient strength for direct post-processing without thermal curing.Then, the green part was sintered in air atmosphere at 1200, 1400 and 1600℃ to remove the cured photosensitive resin and realize the sintering between the powder particles. The effects of the layer thickness and sintering temperature on the dimensional accuracy, relative density, apparent porosity, phase composition and mechanical properties of the green part and sintered part were investigated. The results show that with the increase of the powder thickness, the diffusion effect of photosensitive resin adhesive leads to the deterioration of the green part’s dimension accuracy, the relative density of the green part decreases, the apparent porosity increases and the compressive strength decreases. With the increase of sintering temperature, the shrinkage of sintered parts becomes larger, the relative density becomes bigger, the phase composition remains unchanged, and the mechanical properties are greatly improved compared with those before sintering. When the green part formed at 100 μm of layer thickness is sintered at 1600 ℃ for 4 h, it has the best parameters with the relative density of57%, the apparent porosity of 21.4% and the compressive strength of 62.9 MPa.