Selective Laser Sintering of Zirconia

2000 ◽  
Vol 625 ◽  
Author(s):  
Nicole R. Harlan ◽  
David Bourell ◽  
Seok-Min Park ◽  
Joseph J. Beaman
Keyword(s):  
Selective Laser Sintering ◽  
Base Material ◽  
Laser Sintering ◽  
Average Density ◽  
Mold Material ◽  
Material System ◽  
Green Density ◽  
Stabilized Zirconia ◽  
Ceramic Components ◽  
Shock Resistance

AbstractA combination of Selective Laser Sintering and colloidal infiltration has been used to create partially stabilized zirconia molds for titanium casting. The mold material system was chosen for its low reactivity with molten titanium and thermal shock resistance. The base material, stabilized zirconia mixed with a copolymer binder, was pre-processed before laser sintering into the desired green shape. The average density of the fired parts could be increased to twice that of the green density. Hole sizes as small as 180 m are possible in thin ceramic components.

Ceramic components manufacturing by selective laser sintering

2007 ◽  
Vol 254 (4) ◽  
pp. 989-992 ◽  
Author(s):  
Ph. Bertrand ◽  
F. Bayle ◽  
C. Combe ◽  
P. Goeuriot ◽  
I. Smurov
Keyword(s):  
Selective Laser Sintering ◽  
Laser Sintering ◽  
Ceramic Components

Slurry deposition by airbrush for selective laser sintering of ceramic components

2009 ◽  
Vol 29 (1) ◽  
pp. 1-6 ◽  
Author(s):  
Anja M. Waetjen ◽  
Dominik A. Polsakiewicz ◽  
Ingo Kuhl ◽  
Rainer Telle ◽  
Horst Fischer
Keyword(s):  
Selective Laser Sintering ◽  
Laser Sintering ◽  
Ceramic Components

Experimental investigations of curling phenomenon in selective laser sintering process

2016 ◽  
Vol 22 (2) ◽  
pp. 405-415 ◽  
Author(s):  
Alkhair Almabrouk Mousa
Keyword(s):  
Glass Bead ◽  
Selective Laser Sintering ◽  
Laser Sintering ◽  
Experimental Investigations ◽  
Rapid Manufacturing ◽  
Material System ◽  
Geometric Accuracy ◽  
Sintering Process ◽  
Content Type ◽  
Bed Temperature

Purpose This paper aims to investigate the curling behaviour of selective laser sintered polyamide/glass bead composites with changes in material compositions, part bed temperature, powder base thickness, laser power and layer cooling time. Design/methodology/approach The Taguchi parameter design method (design of experiments, DOE) and analysis of variance (ANOVA) technique were applied in the investigation to determine the optimal process parameter settings. Findings The results of statistical analysis and ANOVA provided evidence for the effectiveness of filler content and its surface treatment on reducing the amount of curling. Research limitations/implications Warping and curling phenomena is one of several aspects of this work that can be pursued further. The present investigation could be expanded to explore other fillers and interface adhesion using other modifiers. Experiments could be conducted with other complicated geometries, various sizes, different positions and locations to widen the knowledge base of geometric accuracy of selective laser sintering process. Practical implications This experimental work is beneficial for materials development and accuracy characterisation in rapid manufacturing techniques. The experimental techniques adopted are readily transferable to virtually any material system used in rapid manufacturing. Originality/value Although many materials have been developed, there is still a need for research into new materials. This work demonstrates that it is possible to improve the geometric accuracy of selective laser sintered components from glass bead- filled polyamide 12 and achieve near-zero curling by adding rigid multiphase-coated particle to the material system.

Optimization on Selective Fiber Laser Sintering of Bimetallic Powder via Design of Experiments Method

2012 ◽  
Author(s):  
Hsin-Te Liao ◽  
Manh Trung Le ◽  
Dinh Vuong Long
Keyword(s):  
Design Of Experiments ◽  
Powder Mixture ◽  
Optimal Parameter ◽  
Process Analysis ◽  
Selective Laser Sintering ◽  
Base Material ◽  
Laser Sintering ◽  
Strong Interactions ◽  
Parameter Setting ◽  
Significant Factors

The objective of this study is to investigate the effect of various parameters on rapid prototyping parts for processes of sintering metallic powder mixture by using Ytterbium fiber optic laser via the design of experiments (DOE) method. Experiments based on the DOE method were utilized to determine an optimal parameter setting for achieving a minimum amount of porosities in specimens during the selective laser sintering (SLS) process. Analysis of variance (ANOVA) was further conducted to identify significant factors. A regression model predicting percentages of porosities under various conditions was developed when the traditional Taguchi’s approach failed to identify a feasible model due to strong interactions of controlled factors. The significant factors to the process were identified by ANOVA. Four controlled factors including pulse frequencies and scan rate of laser beams, laser power and scan line spacing with particle sizes of 75μm of the powder mixture base material had significant influence on the sintering process. Future investigation planned to be carried out for achieving multiple quality targets such as the hardness and the density for 3D parts. The implementation of the DOE method provided a systematic approach to identify an optimal parameter setting of the SLS process; thus, the efficiency of designing optimal parameters was greatly improved. This approach could be easily extended to 3D cases by just including additional parameters into the design. Additionally, utilization of the normality analysis on the residual data ensured that the selected model was adequate and extracted all applicable information from the experimental data.

Optimization on Selective Fiber Laser Sintering of Metallic Powder

2012 ◽  
Vol 472-475 ◽  
pp. 2519-2530 ◽  
Author(s):  
Hsin Te Liao ◽  
Manh Trung Le
Keyword(s):  
Fiber Laser ◽  
Optimal Parameter ◽  
Process Analysis ◽  
Selective Laser Sintering ◽  
Base Material ◽  
Laser Sintering ◽  
Metallic Powder ◽  
Strong Interactions ◽  
Parameter Setting ◽  
Significant Factors

Purpose – The objective of this study is to investigate the effect of various parameters on rapid prototyping parts for processes of sintering metallic powder by using fiber laser via the design of experiments (DOE) method. Design/methodology/approach – Experiments based on the DOE method were utilized to determine an optimal parameter setting for achieving a minimum amount of porosities in specimens during the selective laser sintering (SLS) process. Analysis of variance (ANOVA) was further conducted to identify significant factors. Findings – A regression model predicting percentages of porosities under various conditions was developed when the traditional Taguchi’s approach failed to identify a feasible model due to strong interactions of controlled factors. The significant factors to the process were identified by ANOVA. Research limitations/implications – Four controlled factors including pulse frequencies and scan rate of laser beams, laser power and scan line spacing with particle sizes of 5µm of the powder base material had significant influence on the sintering process. Future investigation planned to be carried out for achieving multiple quality targets such as the hardness and the density for 3D parts. Originality/value – The implementation of the DOE method provided a systematic approach to identify an optimal parameter setting of the SLS process; thus, the efficiency of designing optimal parameters was greatly improved. This approach could be easily extended to 3D cases by just including additional parameters into the design. Additionally, utilization of the normality analysis on the residual data ensured that the selected model was adequate and extracted all applicable information from the experimental data.

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