树脂包覆球形SiO_2颗粒制备3D打印用陶瓷/树脂复合粉体（英文）
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摘要
采用球形致密的SiO2微米颗粒制备用于3D打印的陶瓷/树脂复合粉体,并对粉体的固化和烧结性能进行了研究。结果显示,随着温度升高或固体含量的增加,包覆介质的粘度逐渐增大,最佳树脂浓度为27wt%。均匀包覆的陶瓷/树脂复合粉体具有良好的分散性、流动性(25 (s/50 g))和较大的堆积密度(45.0%)。球形颗粒堆积形成的贯通孔道和球形颗粒表面均匀的吸附能对均匀包覆过程起到了至关重要的作用。包覆层的厚度(1.1～3.7μm)可以通过调节抽滤过程的负压进行精确控制。由于颗粒之间形成了树脂颈部,使制备的粉体具有很好的固化强度,固化的陶瓷生胚经1250℃烧结后获得了性能优异的陶瓷:压缩强度为10.2 MPa,弯曲强度为2.7 MPa,烧结收缩仅5%。上述结果表明,复合粉体在3D打印产业上具有良好的应用前景。
Ceramic/resin composite powders used for 3D printing are synthesized by micro-sized SiO_2 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 27 wt%. 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.
Ceramic/resin composite powders used for 3D printing are synthesized by micro-sized SiO_2 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 27 wt%. 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.
引文
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[2]LI X M,CAO M J,JIANG Y.Microstructure and mechanical properties of porous alumina ceramic prepared by a combination of3-D printing and sintering.Ceram.Int.,2016,42(10):12531-12535.
[3]MAZZOLI A.Selective laser sintering in biomedical engineering.Med.Biol.Eng.Comput.,2013,51(3):245-256.
[4]LYKOV P A,SAPOZHNIKOV S B,SHULEV I S,et al.Composite micropowders for selective laser sintering.Metallurgist,2016,59(9/10):851-855.
[5]SHAHZAD K,DECKERS J,KRUTH J P,et al.Additive manufacturing of alumina parts by indirect selective laser sintering and post processing.J.Mater.Process.Tech.,2013,213(9):1484-1494.
[6]SLOCOMBE A,TAUFIK A,LI L.Diode laser ablation machining of 316L stainless steel powder/polymer composite material:effect of powder geometry.Appl.Surf.Sci.,2000,168(1-4):17-20.
[7]LORRISON J C,DALGARNO K W,WOOD D J.Processing of an apatite-mullite glass-ceramic and an hydroxyapatite/phosphate glass composite by selective laser sintering.J.Mater.Sci-Mater.M.,2005,16(8):775-781.
[8]WANG W,MA S,FUH J H,et al.Processing and characterization of laser-sintered Al2O3/Zr O2/SiO2.Int.J.Adv.Manuf.Tech.,2013,68(9/12):2565-2569.
[9]DENG Z Y,YANG J F,BEPPU Y,et al.Effect of agglomeration on mechanical properties of porous zirconia fabricated by partial sintering.J.Am.Ceram.Soc.,2002,85:1961-1965.
[10]SUN Z Q,LI B Q,HU P,et al.Alumina ceramics with uniform grains prepared from Al2O3 nanospheres.J.Alloy Compd.,2016,688:933-938.
[11]LI B Q,SUN Z Q,HOU G L,et al.The sintering behavior of quasispherical tungsten nanopowders.Int.J.Refract.Met.Hard Mater.,2016,56:44-50.
[12]YANG S,GWAK J N,LIM T S,et al.Preparation of spherical titanium powders from polygonal titanium hydride powders by radio frequency plasma treatment.Mater.Trans.,2013,54(12):2313-2316.
[13]YAN M F,CANNON JR R M,BOWEN H K,et al.Effect of grain size distribution on sintered density.Mater.Sci.Eng.,1983,60(3):275-281.
[14]LU H M,WEN Z,JIANG Q,et al.Nucleus-liquid interfacial energy of elements.Colloid.Surface A,2006,278(1):160-165.
[15]ZHAO J,LU L,ZHANG Z,et al.Continuum modeling of the cohesive energy for the interfaces between films,spheres,coats and substrates.Comp.Mater.Sci.,2015,96:432-438.
[16]OZER I O,SUVACI E,KARADEMIR B,et al.Anisotropic sintering shrinkage in alumina ceramics containing oriented platelets.J.Am.Ceram.Soc.,2006,89(6):1972-1976.
[17]JAGOTA A,DAWSON P R.Simulation of the viscous sintering of two particles.J.Am.Ceram.Soc.,2010,73(1):173-177.
[18]WILSON P J,BLACKBURN S,GREENWOOD R W,et al.The role of zircon particle size distribution,surface area and contamination on the properties of silica-zircon ceramic materials.J.Eur.Ceram.Soc.,2011,31:1849-1855.
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