Mechanical and microstructural properties of Nylon-12/carbon black composites: Selective laser sintering versus melt compounding and injection molding

2011 ◽  
Vol 71 (4) ◽  
pp. 506-510 ◽  
Author(s):  
Siddharth Ram Athreya ◽  
Kyriaki Kalaitzidou ◽  
Suman Das
Keyword(s):  
Carbon Black ◽  
Injection Molding ◽  
Selective Laser Sintering ◽  
Laser Sintering ◽  
Microstructural Properties ◽  
Melt Compounding ◽  
Nylon 12 ◽  
Mechanical And Microstructural Properties

scholarly journals Shaping ceramics through indirect selective laser sintering

2016 ◽  
Vol 22 (3) ◽  
pp. 544-558 ◽  
Author(s):  
Jan Patrick Deckers ◽  
Khuram Shahzad ◽  
Ludwig Cardon ◽  
Marleen Rombouts ◽  
Jozef Vleugels ◽  
...  
Keyword(s):  
Design Methodology ◽  
Dispersion Polymerization ◽  
Selective Laser Sintering ◽  
Laser Sintering ◽  
Powder Synthesis ◽  
Composite Powders ◽  
Content Type ◽  
Production Methods ◽  
Nylon 12 ◽  
Furnace Sintering

Purpose The purpose of this paper is to compare different powder metallurgy (PM) processes to produce ceramic parts through additive manufacturing (AM). This creates the potential to rapidly shape ceramic parts with an almost unlimited shape freedom. In this paper, alumina (Al2O3) parts are produced, as Al2O3 is currently the most commonly used ceramic material for technical applications. Design/methodology/approach Variants of the following PM route, with indirect selective laser sintering (indirect SLS) as the AM shaping step, are explored to produce ceramic parts: powder synthesis, indirect SLS, binder removal and furnace sintering and alternative densification steps. Findings Freeform-shaped Al2O3 parts with densities up to approximately 90 per cent are obtained. Research limitations/implications The resulting Al2O3 parts contain inter-agglomerate pores. To produce higher-quality ceramic parts through indirect SLS, these pores should be avoided or eliminated. Originality/value The research is innovative in many ways. First, composite powders are produced using different powder production methods, such as temperature-induced phase separation and dispersion polymerization. Second, four different binder materials are investigated: polyamide (nylon-12), polystyrene, polypropylene and a carnauba wax – low-density polyethylene combination. Further, to produce ceramic parts with increased density, the following densification techniques are investigated as additional steps of the PM process: laser remelting, isostatic pressing and infiltration.

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