Slurry-based selective laser sintering of polymer-coated ceramic powders to fabricate high strength alumina parts

2011 ◽  
Vol 31 (8) ◽  
pp. 1383-1388 ◽  
Author(s):  
Hwa-Hsing Tang ◽  
Ming-Lu Chiu ◽  
Hsiao-Chuan Yen
Keyword(s):  
Selective Laser Sintering ◽  
High Strength ◽  
Laser Sintering ◽  
Ceramic Powders

scholarly journals Fabrication of Natural Flake Graphite/Ceramic Composite Parts with Low Thermal Conductivity and High Strength by Selective Laser Sintering

2020 ◽  
Vol 10 (4) ◽  
pp. 1314
Author(s):  
Haihua Wu ◽  
Kui Chen ◽  
Yafeng Li ◽  
Chaoqun Ren ◽  
Yu Sun ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Compressive Strength ◽  
Ceramic Composite ◽  
Selective Laser Sintering ◽  
High Strength ◽  
Laser Sintering ◽  
Post Processing ◽  
Composite Part ◽  
Low Thermal Conductivity ◽  
Powder Composition

The 3D graphite/ceramic composite prototyping parts directly prepared by selective laser sintering (SLS) were porous, which led to poor strength and low thermal conductivity. In order to obtain low thermal conductivity and high strength, its thermal conductivity and compressive strength were adjusted by changing the mixture powder composition and adding post-processing. The result showed that the addition of silicon powder in the mixture powder could significantly improve the compressive strength and thermal conductivity. The addition of expanded graphite was beneficial to the formation of the closed pores in the matrix, which slightly reduced the compressive strength but significantly reduced the thermal conductivity. The 3D graphite/ceramic composite part showed an order of magnitude improvement in compressive strength (from 1.25 to 13.87 MPa) but relatively small change in thermal conductivity (from 1.40 to 2.12 W·m−1K−1) and density (from 0.53 to 1.13 g·cm−3) by post-processing. Reasonable mixture powder composition and post-processing were determined and realized the possibility of fabricating a 3D graphite/ceramic composite part with low thermal conductivity but high compressive strength. Furthermore, it could be used for the repeated casting of steel castings, and through the comparative analysis of casting defects, the prepared graphite/ceramic composite part was expected to replace water glass sand mold.

Preparation of high-strength Si3N4 antenna window using selective laser sintering

2021 ◽  
Author(s):  
Kejie Wang ◽  
Chonggao Bao ◽  
Chengyu Zhang ◽  
Yinghong Li ◽  
Rongzhen Liu ◽  
...  
Keyword(s):  
Selective Laser Sintering ◽  
High Strength ◽  
Laser Sintering

Selective Laser Sintering of Si3N4 and Al2O3 Ceramic Powders

2008 ◽  
Vol 368-372 ◽  
pp. 858-861 ◽  
Author(s):  
Jing Zhao ◽  
Wen Bin Cao ◽  
Jiang Tao Li ◽  
Zhao Han ◽  
Yan Hong Li ◽  
...  
Keyword(s):  
Infrared Spectrum ◽  
Spray Drying ◽  
Selective Laser Sintering ◽  
Laser Sintering ◽  
Ceramic Powders ◽  
Rotor Part

Selective laser sintering (SLS) of Si3N4 and Al2O3 powders were investigated in this work. Copolymer was synthesized through monomer MMA and BMA. Infrared spectrum was employed to characterize the as-synthesized copolymer. Results show that the main compositions of the copolymer are PMMA and PBMA. The binders were prepared by mixing the copolymer and the inorganic NH4H2PO4 with certain ratio. Binders were used to coat the Si3N4 and Al2O3 powders by spray drying. The coated powders were sintered successfully by SLS to make cubic part and rotor part.

A thermal model of polymer degradation during selective laser sintering of polymer coated ceramic powders

1996 ◽  
Vol 2 (3) ◽  
pp. 24-40 ◽  
Author(s):  
Neal K. Vail ◽  
Badrinarayan Balasubramanian ◽  
Joel W. Barlow ◽  
Harris L. Marcus
Keyword(s):  
Thermal Model ◽  
Selective Laser Sintering ◽  
Polymer Degradation ◽  
Laser Sintering ◽  
Ceramic Powders

Methods of Prototyping Process Using Modern Additive Technologies

2014 ◽  
Vol 223 ◽  
pp. 199-208 ◽  
Author(s):  
Jerzy Bochnia ◽  
Tomasz Kozior
Keyword(s):  
3D Printing ◽  
Selective Laser Sintering ◽  
Patent Application ◽  
Laser Sintering ◽  
Additive Technologies ◽  
Ceramic Powders

The paper presents the characteristics of the selected additive technologies SLS - selective laser sintering, 3D Printing - bonding of ceramic powders, PolyJet Matrix - photocuring polymer resins. Procedures and methods for preparing models in the above-mentioned technologies are discussed. The examples of models made during research are described. The solutions covered by the patent application are also presented.

scholarly journals Preparation of high-strength Si3N4 antenna window using selective laser sintering

2021 ◽  
Author(s):  
Kejie Wang ◽  
Chonggao Bao ◽  
Chengyu Zhang ◽  
Yinghong Li ◽  
Rongzhen Liu ◽  
...  
Keyword(s):  
Selective Laser Sintering ◽  
High Strength ◽  
Laser Sintering

Selective Laser Sintering of Si3N4 and Al2O3 Ceramic Powders

2008 ◽  
pp. 858-861
Author(s):  
Jing Zhao ◽  
Wen Bin Cao ◽  
Jiang Tao Li ◽  
Zhao Han ◽  
Yan Hong Li ◽  
...  
Keyword(s):  
Selective Laser Sintering ◽  
Laser Sintering ◽  
Ceramic Powders

Direct Fabrication of Bulk Nanostructured Ceramic from Nano-Al2O3 Powders by Selective Laser Sintering

2007 ◽  
Vol 329 ◽  
pp. 613-618 ◽  
Author(s):  
Li Da Shen ◽  
Y.H. Huang ◽  
Zong Jun Tian ◽  
Guo Ran Hua
Keyword(s):  
Selective Laser Sintering ◽  
Laser Sintering ◽  
X Ray Diffraction ◽  
Ceramic Powders ◽  
Technological Parameters ◽  
Bulk Materials ◽  
Al2o3 Ceramic ◽  
X Ray ◽  
Nanostructured Ceramic ◽  
Direct Fabrication

Nanostructured ceramic bulk materials were achieved from nano-Al2O3 ceramic powders via direct selective laser sintering (SLS). SLS as a non-traditional machining technology of Rapid Prototyping was introduced and compared with other ceramic forming technologies. Scanning electron microscopy (SEM) and X-ray diffraction (XRD) were applied to analyze the microstructure of the ceramic bulk materials. These results demonstrated that the nano-Al2O3 ceramic powders can be sintered into bulk materials maintained nanostructure with some technological parameters. It was found that the nanostructured ceramic bulk exhibited unique microstructure and was free formed rapidly by this sintering technology.

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