粉末级配处理对微滴喷射粘结成形可溶性陶瓷芯性能的影响OA

Using the binder jetting technique to fabricate the soluble ceramic cores,and taking advantage of heavy calcium carbonate powders with the particle size distribution ranging from 17.89 μm to 74.19 μm as raw materials to carry out grading treatment,respectively,the effects of powder particle sizes and particle size distributions on the properties of the ceramic cores have been studied.The results show that the bending strength of the ceramic cores can be effectively improved through the grading treatment,and by selecting and using gradation of Z1(17.89 μm)and Z3(32.54 μm)heavy calcium carbonate powders,optimal green body bending strength(1.96 MPa,being 174%of that without grading treatment)can be obtained,and optimal powder bed spreading effect can be also achieved;with the increase of fine powder content,the bending strengths of the sintered ceramic cores exhibit a trend of first increasing and then decreasing.When the fine powder content increases from 20%to 30%,the bending strength increases from 8.24 MPa to 8.72 MPa.However,when the fine powder content further increases to 40%,the bending strength decreases to 7.74 MPa;the ceramic cores sintered by different treatment processes begin to disintegrate after being immersed in 80 ℃ water for 30 minutes,demonstrating excellent solubility.