硫铝酸盐水泥基材料在3DP模型打印中的应用研究

Application of CSA cement-based material in 3DP model printing

为了使硫铝酸盐水泥满足3DP法模型打印的要求,研究了硅粉掺量对复合粉体密度参数及铺粉性能的影响;测试了不同PVA掺量下的打印液渗透参数;测试了不同打印头饱和度下的打印精度及强度;测试了试样经饱和氢氧化钙溶液浸泡3、7 d的单轴抗压强度,并利用XRD和SEM分析了打印试样的水化产物和微观形貌。研究表明:硫铝酸盐水泥基材料能够打印具有较好成型精度的复杂模型,并且模型具备一定的成型强度。Z向的早期抗压强度为0.88 MPa,经饱和氢氧化钙溶液浸泡养护3 d的抗压强度为5.09 MPa,养护7 d的抗压强度为7.32 MPa。最后利用配制的复合硫铝酸盐水泥基粉体和优化的打印工艺,用3DP法打印出狮子模型和花瓶模型。

In order to make CSA cement meet the requirements of 3DP model printing,the influence of silica powder content on the density parameters of composite powder and powder spreading performance was studied.The permeation parameters of printing liquid with different PVA content were tested.The printing precision and strength under different print head saturation were tested.The uniaxial compressive strength of the sample soaked in saturated calcium hydroxide solution for 3 and 7 days was tested,and hydration products and microstructure of the printed samples were analyzed by XRD and SEM.Studies show that CSA cement-based material can print complex models with good forming accuracy and certain strength.The early compressive strength in Z direction is 0.88 MPa.After soaking in saturated calcium hydroxide solution for 3 days,the compressive strength is 5.09 MPa,and the compressive strength of curing for 7 days is 7.32 MPa.Finally,the lion model and the vase model were printed by 3DP method with the composite CSA cement powder and the optimized printing process.