Simulation of Temperature Field in Selective Laser Sintering on PA6/Cu Composite Powders

2011 ◽  
Vol 213 ◽  
pp. 519-523 ◽  
Author(s):  
Jian Zhang ◽  
De Ying Li ◽  
Bin Qiu ◽  
Long Zhi Zhao
Keyword(s):  
Temperature Field ◽  
Selective Laser Sintering ◽  
Element Model ◽  
Laser Sintering ◽  
Moving Heat Source ◽  
Temperature Field Distribution ◽  
Forming Process ◽  
Composite Powders ◽  
Simulation Results ◽  
Thermal Physical Properties

The 3D transient finite element model in selective laser sintering is established based on ANSYS. The load of moving heat source at different time and locations are achieved by APDL and “element birth/death” technique, and the influence of convection, radiation, latent heat of phase change and thermal physical properties on temperature are taken into account. The temperature field distribution on time in forming process and temperature gradient distributions of pool cross-section are selectively studied, to provide theoretical basis for reasonable process parameters. The SLS experiment on PA6/Cu composite powders is carried out to verify the accuracy of simulation results.

Temperature field distribution in polymer particles during surface-selective laser sintering

Laser Physics ◽  
2020 ◽  
Vol 30 (5) ◽  
pp. 055601
Author(s):  
E N Antonov ◽  
A G Dunaev ◽  
A N Konovalov ◽  
S A Minaeva ◽  
V K Popov
Keyword(s):  
Temperature Field ◽  
Field Distribution ◽  
Selective Laser Sintering ◽  
Laser Sintering ◽  
Polymer Particles ◽  
Temperature Field Distribution

scholarly journals Online Monitoring Based on Temperature Field Features and Prediction Model for Selective Laser Sintering Process

2018 ◽  
Vol 8 (12) ◽  
pp. 2383 ◽  
Author(s):  
Zhehan Chen ◽  
Xianhui Zong ◽  
Jing Shi ◽  
Xiaohua Zhang
Keyword(s):  
Temperature Field ◽  
Prediction Model ◽  
Selective Laser Sintering ◽  
Principal Component ◽  
Laser Sintering ◽  
Support Vector ◽  
Sintering Process ◽  
Metal Materials ◽  
Key Features ◽  
The Mathematical Model

Selective laser sintering (SLS) is an additive manufacturing technology that can work with a variety of metal materials, and has been widely employed in many applications. The establishment of a data correlation model through the analysis of temperature field images is a recognized research method to realize the monitoring and quality control of the SLS process. In this paper, the key features of the temperature field in the process are extracted from three levels, and the mathematical model and data structure of the key features are constructed. Feature extraction, dimensional reduction, and parameter optimization are realized based on principal component analysis (PCA) and support vector machine (SVM), and the prediction model is built and optimized. Finally, the feasibility of the proposed algorithms and model is verified by experiments.

Research on Forming Process of Flake Graphite Powder by Selective Laser Sintering

2016 ◽  
Vol 53 (10) ◽  
pp. 101409
Author(s):  
吴海华 Wu Haihua ◽  
李腾飞 Li Tengfei ◽  
肖林楠 Xiao Linnan ◽  
熊盼 Xiong Pan
Keyword(s):  
Selective Laser Sintering ◽  
Graphite Powder ◽  
Laser Sintering ◽  
Flake Graphite ◽  
Forming Process

PREPARATION OF Cu-SiO2/PA12 COMPOSITE POWDERS BY ELECTROLESS PLATING FOR USE IN SLS PROCESSING

2019 ◽  
Vol 26 (09) ◽  
pp. 1950055
Author(s):  
CHENGMEI GUI ◽  
ZHENMING CHEN ◽  
CHENGUANG YAO ◽  
GUISHENG YANG
Keyword(s):  
Selective Laser Sintering ◽  
Laser Sintering ◽  
Composite Particles ◽  
Sintering Behavior ◽  
Contact Interface ◽  
Composite Powders ◽  
Copper Particles ◽  
Dimensional Precision ◽  
Composite Plating ◽  
Sintering Neck

In this work, SiO2-encapsulated copper particles/PA12 (Cu-SiO2/PA12) composite powders were prepared by electroless composite plating, and the laser sintering behavior was investigated. Results showed that Cu, Cu2O, CuO, and SiO2 (Cu-SiO2) composite particles were plated on the surface of KH550-modified PA12 powders. The Cu-SiO2 particles existed independently on PA12 surface, and the size was around 200 nm. The melting temperature and crystallization temperature of Cu-SiO2/PA12 composite powders were 183∘C and 150∘C. The results indicate that the selective laser sintering (SLS) process involved the contact of Cu-SiO2/PA12 powders, the formation of sintering neck, the growth of sintering neck, and the formation of fused solid. The Cu-SiO2 composite particles uniformly dispersed in the part due to surface tension, and the contact interface was good due to their similar polarity. The Cu-SiO2/PA12 SLS parts had excellent dimensional precision. The tensile strength of the 15[Formula: see text]W-sintered Cu-SiO2/PA12 specimen was 48[Formula: see text]MPa.

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.

scholarly journals Modeling and simulation of the temperature field of selective laser sintering

2021 ◽  
Vol 1885 (3) ◽  
pp. 032073
Author(s):  
Qiyang He ◽  
Xiaohui Ao ◽  
Huanxiong Xia ◽  
Jianhua Liu ◽  
Chun Yang ◽  
...  
Keyword(s):  
Temperature Field ◽  
Modeling And Simulation ◽  
Selective Laser Sintering ◽  
Laser Sintering

Processing-Structure-Property Relations of Polymer-Polymer Composites Formed by Cryogenic Mechanical Alloying for Selective Laser Sintering Applications

2000 ◽  
Vol 625 ◽  
Author(s):  
J. P. Schultz ◽  
J. P. Martin ◽  
R. G. Kander ◽  
C. T. A. Suchicital
Keyword(s):  
Mechanical Alloying ◽  
Polymer Composites ◽  
Effective Means ◽  
Selective Laser Sintering ◽  
Domain Size ◽  
Laser Sintering ◽  
Charge Ratio ◽  
Composite Particles ◽  
Structure Property ◽  
Composite Powders

AbstractCryogenic mechanical alloying (CMA) has been shown to be an effective means for producing composite powders for selective laser sintering (SLS). Unlike composite particles made by a coating process, both phases are continuous throughout the particles formed by CMA. Consolidation of these composite particles via SLS offers the possibility of forming parts with a co-continuous microstructure. In this research, the microstructure of mechanically alloyed polymer-polymer composites for use in the SLS process is investigated using transmission electron microscopy. By varying the charge ratio and milling time of the CMA process, the phase domain size of the resulting composite powder can be manipulated. This ongoing work explores the microstructural evolution as the composite powders are consolidated via SLS into macroscopic parts, as well as the relationships between microstructure and bulk properties.

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