冻结水玻璃陶瓷浆料选区激光固化增材制造方法

Selective Laser Curing Additive Preparation of Frozen Water Glass Ceramic Slurry

针对浆料基陶瓷增材制造的支撑问题,提出冻结浆料选区激光固化新方法,以水玻璃作为黏结剂配制陶瓷浆料,采用冷冻板整体冻结料层建立固体支撑,利用水玻璃受热失水效应固定陶瓷颗粒,最后在水中融化去除支撑材料。研究固含量、激光功率、扫描速率、扫描间距等因素对固化线、面、体尺寸形貌的影响规律,制得压缩强度29.4 MPa、抗弯强度2.53 MPa的坯体,以及厚度130μm、跨度60 mm的薄壁结构。新方法具有固体支撑建立和去除效率高的特点,加工的薄壁、悬臂结构不易变形,在快速铸造领域具有应用前景。

In view of the support problem of slurry based ceramic additive preparation, a novel method of selective laser curing of frozen slurry was proposed. Water glass was used as a binder to prepare ceramic slurry, the whole slurry layer was frozen by cryoplate in order to establish a solid support, the dehydration effect of water glass heated was used to fix ceramic particles, and the frozen support materials were melted in water. The effects of solid content, laser power, scanning speed and scanning distance on the size and morphology of curing line, surface and body were investigated. A green body with a compressive strength of 29.4 MPa, a bending strength of 2.53 MPa, and a thin-wall structure with the thickness of 130 μm and span of 60 mm was prepared. This proposed method has the characteristics of high efficiency of solid support establishment and removal, and the processed thin-wall and cantilever structure is not easy to deform, thus having a promising application potential in the field of rapid casting.