Design and fabrication of cast orthopedic implants with freeform surface textures from 3-D printed ceramic shell
Design and fabrication of cast orthopedic implants with freeform surface textures from 3-D printed ceramic shell
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DOI：
10.1002/1097-4636(200009)53:5
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发表时间：
2000-10-01
期刊：
影响因子：
--
通讯作者：
Caldarise, S
中科院分区：
文献类型：
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作者：
Curodeau, A;Sachs, E;Caldarise, S
三维打印是一种实体自由成型制造工艺，它直接从计算机模型创建零件。通过重复地散布粉末层并通过粘合剂材料的喷墨印刷选择性地将粉末结合在层中来构建部件。将3D打印应用于制造具有悬垂和底切几何形状的亚毫米表面纹理，用于骨科假体中作为骨长入结构，将3D打印用于制造氧化铝粉末和二氧化硅粘合剂的陶瓷模具，并将这些模具用于铸造Co-Cr（ASTM F75）合金的骨长入表面。陶瓷模具的最小正特征尺寸以及因此铸件的最小负特征尺寸被确定为约200 × 200 × 175 μ m，并且受到承受处理所需的陶瓷强度的限制。发现陶瓷模具中的最小负特征尺寸以及因此铸件中的最小正特征尺寸约为350 × 350 × 175 μ m，并且由从陶瓷中去除粉末的限制以及在铸造期间用熔融金属填充这些小特征所需的压力来确定。纹理设计有5层不同的几何定义，允许设计总孔隙率为30- 70%的悬垂几何结构。这些设计中包含了小至350 x 350 x 200 mu m的特征，并成功铸造，（C）2000 John Wiley & Sons，Inc.
Three-dimensional printing is a solid freeform fabrication process, which creates parts directly from a computer model. The parts are built by repetitively spreading a layer of powder and selectively joining the powder in the layer by ink-jet printing of a binder material. 3D printing was applied to the fabrication of sub-millimeter surface textures with overhang and undercut geometries for use in orthopedic prostheses as bony ingrowth structures, 3D printing is used to fabricate ceramic molds of alumina powder and silica binder, and these molds are used to cast the bony ingrowth surfaces of Co-Cr (ASTM F75) alloy. Minimum positive feature sizes of the ceramic mold and, therefore, minimum negative feature sizes of castings were determined to be approximately 200 x 200 x 175 mu m and were limited by the strength of ceramic needed to withstand handling. Minimum negative feature sizes in the ceramic mold and, therefore, minimum positive features in the casting were found to be approximately 350 x 350 x 175 mu m and were determined by limitations on removal of powder from the ceramic and the pressure required to fill these small features with molten metal during casting. Textures were designed with 5 layers of distinct geometric definition, allowing for the design of overhung geometry with overall porosity ranging from 30-70%. Features as small as 350 x 350 x 200 mu m were included in these designs and successfully cast, (C) 2000 John Wiley & Sons, Inc.