Ceramic/Resin Composite Powders with Uniform Resin Layer Synthesized from SiO2 Spheres for 3D Technology

doi:10.15541/jim20180383

Abstract

Abstract:

Ceramic/resin composite powders used for 3D printing are synthesized by micro-sized SiO₂ dense spheres through a simple method, and their consolidation and sintering performances are fully characterized. The results show that the viscosity of coating media decreases gradually with the increasing temperature or decreasing the resin content and the most suitable resin content is 27wt%. The uniformly coated ceramic/resin composite spheres with well dispersity, fine fluidity (25 (s/50 g)) and larger packing density (45.0%) are successfully synthesized. The spherical shape of ceramic powders is revealed to be the vital factor for the achievement of uniform coating layers, because of the interconnected packed pores and the uniform cohesive energy of spheres. Meanwhile, the thickness (1.1-3.7 μm) of coating layer is controlled precisely through changing the pressure during the filtration process. Moreover, the synthesized powders show well consolidation performance for the favorite necks among spheres. After sintered at 1250 ℃, the ceramics with compressive strength of 10.2 MPa and bending strength of 2.7 MPa are obtained while the shrinkage is only 5%, which indicates the composite spheres have an advantage in improving the precision of 3D technology.

Key words: powder technology, SiO₂ spheres, 3D printing, coating layer

CLC Number:

TB332

Zhi-Qiang SUN, Xiao-Bo YANG, Hua-Dong WANG, De-Li LI, Shu-Qin LI, Yi LÜ. Ceramic/Resin Composite Powders with Uniform Resin Layer Synthesized from SiO₂ Spheres for 3D Technology[J]. Journal of Inorganic Materials, 2019, 34(5): 567-572.

Figures/Tables 7

Fig. 1 Schematic of fabrication for ceramic/resin composite powders

Fig. 2 Effect of temperature and solid content on viscosity of resin slurry

Fig. 3 SEM images of SiO2 spheres (a), coated spheres (b), the cross section of coating layer (c), and particle size distribution before/after coating (d)

Fig. 4 SEM images of composite spheres and corresponding coating layer fabricated at different negative pressures (a) 0.1 MPa; (b) 0.3 MPa

Fig. 5 Photographs of (a) composite powders, (b) consolidated bulk and (c) polished bulk

Fig. 6 SEM image of microstructure of consolidated bulk

Fig. 7 shows the characterization of SiO2 ceramics synthesized by the composite spheres with layer thickness of 2 μm after consolidated and sintered at 1250 ℃ for 2 h. Fig. 7(a) is the SEM image of the fracture surface of ceramic, exhibiting that the uniformly arranged particles are sintered together and the sintered necks among spheres can be easily observed. The pores are mostly composed of the cell walls of spheres and no blockages derived from uneven shrinkage can be found. The narrow pore size distribution shown in Fig. 7(b) also indicates the ceramics are well structured without structural defects.

References 18

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Ceramic/Resin Composite Powders with Uniform Resin Layer Synthesized from SiO₂ Spheres for 3D Technology

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