Characterisation of innovative materials for Direct Laser Sintering

2004 ◽  
Vol 860 ◽  
Author(s):  
E. Bassoli ◽  
A. Gatto ◽  
L. Iuliano ◽  
E. Atzeni
Keyword(s):  
Laser Sintering ◽  
Rapid Manufacturing ◽  
Cad Model ◽  
New Materials ◽  
Aluminium Composite ◽  
Direct Laser ◽  
Powder Deposition ◽  
End Products ◽  
Innovative Materials ◽  
Mechanical Performances

ABSTRACTThe performances achieved by Rapid Prototyping techniques are progressively leading towards Rapid Manufacturing, that is the capability to produce end products, directly from the CAD model. Even so, the diffusion of these techniques is hardly supported by scientific knowledge about the micro-mechanisms ruling the macroscopic performances of the part. In the present research, mechanical performances of new materials produced by Direct Laser Sintering technique have been studied: a Polyamide and an innovative Polyamide-Aluminium composite (Alumide). Specimens were produced with different orientations in regard to powder deposition plane and laser path, to investigate how the manufacturing anisotropy affects the part performances.

Direct Laser Sintering of metal parts: characterisation and evaluation of joining mechanisms

2004 ◽  
Vol 860 ◽  
Author(s):  
E. Bassoli ◽  
A. Gatto ◽  
L. Iuliano ◽  
E. Atzeni
Keyword(s):  
Selective Laser Sintering ◽  
Tensile Tests ◽  
Laser Sintering ◽  
Experimental Methodology ◽  
Metal Powders ◽  
Direct Laser ◽  
Powder Deposition ◽  
Mechanical Performances ◽  
Plastic Parts ◽  
Market Solutions

ABSTRACTRapid Prototyping and Tooling are playing a more and more important role in the achievement of compressed time-to-market solutions, where prototype parts and tools are produced directly from the CAD model. In particular, Selective Laser Sintering (SLS) of metal powders with liquid phase is frequently applied for the production of inserts for injection moulding of plastic parts.An experimental campaign has been planned to investigate the surface finish and mechanical performances of Direct Laser Sintering technique, with particular regard to the effect of the laser sintering strategy on the anisotropy of the final part. Tensile specimens of DirectMetal 20 and DirectSteel 20 materials have been produced, with different orientations in regard to laser path.Rupture surfaces after the tensile tests were observed at the SEM, in order to understand failure mechanisms, whereas the observation of polished sections helped investigating joining phenomena between the particles. The proposed experimental methodology allowed correlating the macroscopic performances to the micro-mechanisms ruling the process, proving that no considerable differences can be noticed between samples produced in the X and Y direction within the plane of powder deposition.

Materials technology: Innovations and progress

Impact ◽  
2020 ◽  
Vol 2020 (2) ◽  
pp. 52-53
Author(s):  
Lucy Sharp
Keyword(s):  
Material Properties ◽  
New Materials ◽  
Medical Problems ◽  
Technology Innovations ◽  
Societal Challenges ◽  
New Material ◽  
Innovative Materials ◽  
The Creation ◽  
Novel Applications

Materials technology is a constantly evolving discipline, with new materials leading to novel applications. For example, new material properties arise from combining different materials into composites. Researching materials can help solve societal challenges, with the creation of innovative materials resulting in breakthroughs in overcoming hurdles facing humankind, including energy challenges and medical problems. Innovative materials breathe new life into industries and spur on scientific and technological discovery.

WC–Co particulate reinforcing Cu matrix composites produced by direct laser sintering

2006 ◽  
Vol 60 (29-30) ◽  
pp. 3664-3668 ◽  
Author(s):  
Dongdong Gu ◽  
Yifu Shen
Keyword(s):  
Laser Sintering ◽  
Matrix Composites ◽  
Direct Laser

Composition and Microstructure of Laser Cladding of 316 Stainless Steel

2011 ◽  
Vol 467-469 ◽  
pp. 2054-2059
Author(s):  
Kai Zhang ◽  
Miao Yan Li ◽  
Xin Min Zhang
Keyword(s):  
Stainless Steel ◽  
Laser Cladding ◽  
Layered Manufacturing ◽  
Rapid Manufacturing ◽  
Cad Model ◽  
Laser Metal Deposition ◽  
Post Processing ◽  
316 Stainless Steel ◽  
3D Cad ◽  
Manufacturing Techniques

Laser Metal Deposition Shaping (LMDS) is a Rapid Manufacturing (RM) process that can be classified under the area of layered manufacturing techniques, where parts are built in layers. Parts of any complexity can be built directly from the 3D CAD model without much human intervention and requires minimum post-processing. In fact, LMDS technique can be recognized as multilayer laser cladding. Accordingly, it is necessary to perform the elementary laser cladding experiments with common metal powder so as to better understand the LMDS process. Then the characteristics of microstructure, composition and phase of as-deposited clads were analyzed through SEM and XRD, as well as relative model. The results prove that the microstructure of 316 stainless steel deposits is composed of the slender dendrites growing epitaxially from the substrate, and the composition is uniform without obvious segregation. Besides, it can be deduced from XRD diagram that the microstructure is composed of mono-phase γ.

scholarly journals Fabrication of water-cooled laser silicon mirror by direct laser sintering

2014 ◽  
Vol 22 (8) ◽  
pp. 9902 ◽  
Author(s):  
Chongwen He ◽  
Haihong Zhu ◽  
Panpan Hu
Keyword(s):  
Laser Sintering ◽  
Direct Laser

scholarly journals CLINICAL EVALUATION OF COBALT-CHROMIUM-BASED FIXED DENTURES

2019 ◽  
Vol 15 (3) ◽  
pp. 146-151
Author(s):  
Арзу Керимова ◽  
Arzu Kerimova
Keyword(s):  
Survival Rate ◽  
Laser Sintering ◽  
High Wear Resistance ◽  
Marginal Adaptation ◽  
Direct Metal Laser Sintering ◽  
Cobalt Chromium ◽  
Proximal Caries ◽  
Direct Laser ◽  
Resistance To Deformation ◽  
Regional Adaptation

Subject. Ceramic-metal prostheses are distinguished by high wear resistance, resistance to deformation, and tight fit to the gums. However, there are relatively large differences in determining the success / survival of cobalt chromium based restorations. The article presents the results of a study of cobalt-chromium fixed dentures. Objectives — evaluate the effectiveness of cobalt-chromium fixed dentures made using the direct metal laser sintering (DMLS) technique. Material and methods. 32 patients (mean age 41.8 ± 2.46 years) were found to have 54 fixed cobalt-chromium fixed bridges made using direct laser sintering of metals. Dentures were evaluated between 6, 12, 24, 36 months according to G. Ryge criteria. The survival rate of restorations is calculated according to Kaplan-Meyer. Results. Assessment of fixed prostheses revealed the absence of criteria C and D in all 3 categories. A comparative analysis of prostheses showed no change in the period 6, 12, 24 months. After 36 months, chips that did not violate the function of the prosthesis were revealed in 5.5 % of cases, visible signs of a cleft in the category of “marginal adaptation” in 1.8 % of cases, edge discoloration of the surface in 3.7 % of cases. Radiographically, 1 patient showed signs of incipient proximal caries and periapical changes, respectively. During the study period of 6-24 months. survival rate was 1.0. The survival of the restoration over a 3-year period was 88.9 %. Conclusion. The frequency of cleavage was 5.5 %, which is comparable to the usual performance of ceramic-metal restorations. The visible signs of a cleft in the regional adaptation was 1.8 %, and the regional color mismatch was 3.7 %. 1.8 % of restoration was detected. Signs of incipient proximal caries were 1.8 %, periapical changes — 1.8 %. Survival was 88.9 %.

Formation of Copper-Based Metal Part via Direct Laser Sintering

2003 ◽  
Vol 437-438 ◽  
pp. 273-276 ◽  
Author(s):  
Xin Hua Wang ◽  
Jerry Y.H. Fuh ◽  
Yoke San Wong ◽  
L. Lu ◽  
H.T. Loh ◽  
...  
Keyword(s):  
Laser Sintering ◽  
Metal Part ◽  
Direct Laser

scholarly journals Rapid manufacturing of bioceramic/polymer composite implants by selective laser sintering

2009 ◽  
Vol 36 (1) ◽  
pp. 25 ◽  
Author(s):  
L. Hao ◽  
M.M. Savalani ◽  
R.A. Harris ◽  
Y. Zhang ◽  
K.E. Tanner
Keyword(s):  
Polymer Composite ◽  
Selective Laser Sintering ◽  
Laser Sintering ◽  
Rapid Manufacturing

Simulation of Geometry and Heat Transfer in a Thin Wall Produced by Direct Laser Powder Deposition

2011 ◽  
Vol 227 ◽  
pp. 134-137
Author(s):  
Karim Kheloufi ◽  
El Hachemi Amara
Keyword(s):  
Three Dimensional ◽  
Deposition Process ◽  
Thin Wall ◽  
Three Dimensional Model ◽  
Laser Powder Deposition ◽  
Commercial Code ◽  
Geometrical Features ◽  
Direct Laser ◽  
Powder Deposition ◽  
Single Bead

A three dimensional model for direct laser powder deposition process is developed to simulate the geometry and the thermal field in building a single-bead wall (thin-wall). This model was employed using the Fluent commercial code to which several modules were appended (User Defined Functions UDF). The temperature distribution, the geometrical features of the generated structure, and thermal cycles have been carried out. We show that the results analysis can provide guidance for the process parameter selection in LPD. , and develop a base for further residual stress analysis.

Sign in / Sign up

Export Citation Format

Share Document