Abstract: It was difficult to control the structure of the ceramic parts or to realize a high-density green body, and the effects of postprocessing at atmospheric pressure were usually poor when forming ceramic green parts by commercial BJP system. The densification of Al2O3 green specimens were controlled by adjusting the formulation of molding powder materials, adjusting the thickness of powder layers and switching powder-dispensing method based on the self-developed BJP system and own material. The relatively density of the high-dense green specimens was reached 43.9%. Furthermore, the integrated post-processing procedure of “ceramic slurry infiltration and stepwise sintering” was used to study the infiltration-strengthening mechanism against different green bodies, and thereby, presintering processes were regulated to significantly improve the final performance of high density green bodies, having the relatively density, bending strength and compressive strength of 89.3%, 91.9 MPa and 813.2 MPa, respectively, after sintering under atmospheric pressures. The forming material, process procedures and equipment applied in this study had low threshold and were easy to operate, providing a flexible and quick technical scheme for the preparation of high-performance structural ceramics.

Key words: ceramic, additive manufacturing, binder jet printing (BJP) process, urea formaldehyde

摘要： 商用设备在进行陶瓷坯体成形时不易对坯体组织进行调控，难以成形高致密坯体，且常压后处理强化效果较差.基于自开发成形系统和自有材料，通过调节成形粉末配方、调控铺粉层厚、切换铺粉方法等调控Al2O3坯体的成形组织，成形了相对密度为43.9%的高致密坯体。采用“陶瓷浆料渗透+分步烧结”综合化后处理流程研究了不同坯体组织的渗透强化机理，并以此为依据对预烧结过程进行调控，显著提升了高致密成形坯体的最终性能，常压烧结后相对密度达89.3%，抗弯和抗压强度分别为91.9 MPa和813.2 MPa。该研究所用材料、工艺和装备仪器门槛低、易操作，为制备高性能结构陶瓷提供了一种灵活、快捷的技术方案。

关键词: 陶瓷, 增材制造, 喷射粘结工艺, 脲醛树脂