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

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

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.

Microstructures and properties of direct laser sintered tungsten carbide (WC) particle reinforced Cu matrix composites with RE–Si–Fe addition: A comparative study

2009 ◽  
Vol 24 (11) ◽  
pp. 3397-3406 ◽  
Author(s):  
Dongdong Gu ◽  
Yifu Shen
Keyword(s):  
Mechanical Properties ◽  
Comparative Study ◽  
Tungsten Carbide ◽  
High Performance ◽  
Chemical Properties ◽  
Particle Dispersion ◽  
Matrix Composites ◽  
Direct Laser ◽  
Interfacial Compatibility ◽  
Fe Addition

The poor wettability between ceramics and metals is a main obstacle in obtaining high-performance metal-matrix composites (MMCs) parts using direct metal laser sintering (DMLS). Rare earth (RE) elements, due to their unique physical and chemical properties, have high potential for improving laser processability of MMCs. In this work, a comparative study was performed to investigate the influence of RE–Si–Fe addition on microstructural features and mechanical properties of DMLS processed tungsten carbide (WC) particle reinforced Cu MMCs parts. It showed that by adding 3 wt% RE–Si–Fe, the WC reinforcing particles were refined, the particle dispersion state was homogenized, and the particle/matrix interfacial compatibility was enhanced. The RE–Si–Fe-containing WC/Cu MMCs parts possessed significantly elevated mechanical properties, i.e., densification level of 95.7%, microhardness of 417.6 HV, fracture strength of 201.8 MPa, and friction coefficient of 0.8. The metallurgical functions of the RE–Si–Fe additive for the improvement of DMLS quality of MMCs parts were discussed.

Direct laser sintering of Cu-based metal for rapid tooling

2007 ◽  
Vol 28 (1) ◽  
pp. 63
Author(s):  
Y. Tang ◽  
H.T. Loh ◽  
J.Y.H. Fuh ◽  
Y.S. Wong ◽  
L. Lu
Keyword(s):  
Laser Sintering ◽  
Rapid Tooling ◽  
Direct Laser

Effect of braze flux on direct laser sintering Cu-based metal powder

2006 ◽  
Vol 27 (2) ◽  
pp. 166-170 ◽  
Author(s):  
H.H. Zhu ◽  
L. Lu ◽  
J.Y.H. Fuh ◽  
C.C. Wu
Keyword(s):  
Metal Powder ◽  
Laser Sintering ◽  
Direct Laser
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