2.4 3DP
MIT's Jason Grau et al. [13] used a 3DP technique to prepare an alumina mold for slip casting instead of a conventional plaster mold. Alumina molds have higher strength and can be heated to several hundred degrees to reduce drying time and control the microscopic and macroscopic structure of the model.
PF Blazdell et al. [14] of Brunel University in the United Kingdom prepared 60 vol% ceramic slurry and multi-layer printing to prepare ceramic parts. The printing substrate is filter paper and nitrocellulose. The prepared ZrO 2 suspension is printed on the substrate layer by layer. After forming, it is heated to 120 ° C for 1 h under gas protection to remove the solvent. Then, it was placed on an Al 2 O 3 coarse particle layer or an Al 2 O 3 plate, heated in air to 450 ° C, and the substrate was removed, and sintered at 1500 ° C. The microstructure can be adjusted by carbon black "ink". The key to this process is the formulation of "ink". The viscosity of the ink is not too high, so a thinner is required, and the addition of the diluent brings drying and porosity problems. In the future, the direction is to use a dispersant reasonably, increase the volume content of the ceramic powder as much as possible, increase the solvent volatility, control the drying process, and control the subsequent "ink" process.
3 Conclusion
The materials used in RP technology have expanded from the field of photosensitive curing resins to other fields such as plastics, metals, ceramics, etc., and the process has been continuously improved. The RP technologies used in the ceramic field include LOM, FDC, SLS, 3DP, etc. Among them, LOM technology has great advantages in preparing high quality ceramic parts, while the other three processes are difficult to obtain high quality due to low density of the green body. Density ceramic parts, but because of the fast forming, can be used to manufacture ceramic parts that are not required.
The development direction of RP technology in the field of ceramics is to increase the content of ceramic powder in the green body as much as possible under the premise of ensuring the formation; secondly, to improve the bonding quality between layers and minimize the anisotropy; In the future, surface slices can be developed.
Since there is no need for a mold and no machining, the design can be adjusted at any time. The RP technology has broad application prospects in the following aspects: preparing ceramic parts with complex shapes, functionally graded materials, ceramic parts with microstructures, porous ceramic parts, and the like.
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