scholarly journals Microwave Sintering of Alumina at 915 MHz: Modeling, Process Control, and Microstructure Distribution

Materials ◽  
2019 ◽  
Vol 12 (16) ◽  
pp. 2544 ◽  
Author(s):  
Sylvain Marinel ◽  
Charles Manière ◽  
Anthony Bilot ◽  
Christelle Bilot ◽  
Christelle Harnois ◽  
...  
Keyword(s):  
3D Modeling ◽  
Microwave Sintering ◽  
Single Mode ◽  
Dielectric Materials ◽  
Process Efficiency ◽  
Heating Rates ◽  
Modeling Process ◽  
Large Size ◽  
Slit Position ◽  
Field Homogeneity

Microwave energy can be advantageously used for materials processing as it provides high heating rates and homogeneous temperature field distribution. These features are partly due to the large microwave penetration depth into dielectric materials which is, at room temperature, a few centimeters in most dielectric materials. However, up to now, this technology is not widely spread for high-temperature material processing applications (>1200 °C), because its reproducibly and ability to sinter large size samples (>30 cm3) still needs to be improved. In this context, this paper describes both an empirically designed 915 MHz single-mode cavity made from SiC susceptors and refractory thermal insulation, and the 3D modeling of the process in order to improve our understanding of it. Different susceptors geometries and coupling slit position were numerically tested in order to better understand how these parameters impact the field homogeneity and the process stability. It was found that positioning the largest surface of the susceptors parallel to the electrical field allows a very uniform and hybrid heating of the material, while avoiding plasma or thermal instabilities. This was correlated to the 3D modeling results. Finally, thanks to a fully-automatized system this apparatus was used to sinter large size (~30 cm3) low-loss dielectric alumina samples. The sintered materials were subsequently characterized in terms of density, grain size distribution, and homogeneity. The reproducibility was also discussed, demonstrating the process efficiency and reliability.

Effect of Green Microstructure and Processing Variables on the Microwave Sintering of Alumina

1990 ◽  
Vol 189 ◽  
Author(s):  
Arindam Dé ◽  
Iftikhar Ahmad ◽  
E. Dow Whitney ◽  
David E. Clark
Keyword(s):  
Particle Size ◽  
Microwave Sintering ◽  
Heating Rates ◽  
Hybrid Heating ◽  
Processing Variables ◽  
Conventional Sintering ◽  
Rapid Sintering ◽  
Temperature Time ◽  
Fast Firing

ABSTRACTThe concept of 'hybrid heating with microwave (MW) energy at 2.45 GHZ.'for ultra rapid sintering of alumina is being introduced. This technique is a combination of MW - materual interaction as well as conventional radiant/conduction mechanisms, and facilitates the attainment of perhaps, the highest possible heating rates in a multimode MW cavity at 2.45 GJZz. (1500ºC in 120 sees.). Rapid sintering of pure.undoped alumina with this novel techniQue culminates in uniform, homogeneous microstructures and mechanical property enhancements vis-a-vis conventional fast firing.The role of green microstructure (particle size) on MW(hybrid) heating and processing variables (temperature, time) on the MW (hybrid) heating phenomena vs. conventional fast firing were investigated. Hybrid heated samples showed accelerated densification with comparable grain sizes when compared with the conventionally fast fired samples. The effectof particle size on the microwave (hybrid) heating phenomena was found to be analogous to conventional sintering.

scholarly journals 3D modeling of multimode and single mode fiber

2019 ◽  
Vol 16 (3) ◽  
pp. 1398
Author(s):  
Murizah Kassim ◽  
Ahmad Syahir Arif Mohd Zaid ◽  
Azlina Idris ◽  
Shahrani Shahbudin ◽  
Roslina Mohamad ◽  
...  
Keyword(s):  
Fiber Optics ◽  
3D Modeling ◽  
Service Providers ◽  
Single Mode ◽  
Single Mode Fiber ◽  
Infrastructure Development ◽  
Multimode Fiber ◽  
Internet Service ◽  
Fiber Technology ◽  
Technical Specifications

<span>This paper presents a design of 3D modeling of Multimode and Single Mode Fiber using SolidWorks. Fiber technology is essential that presents optical fiber is the fastest optical cable laid by Internet Service Providers in network communication. The current design of both fibers has less detail animation on technical specifications of light propagations and cladding. Thus, characterization difficulties occur between this two fiber optics cables. It also has less promotion in media publications such as 3D model design as guidance to users. This paper presents details on 3D modeling of multimode mode and single mode fiber specifications held in the industry market.  A 3D design with SolidWorks and comparison of both fiber characteristics are presented. Based on the 3D designed model, users are analyzed on their perspective and searching information which benefits telecommunication’s company. Technical calculations like core-cladding diameter ratio in microns are animated. The propagation of light in 3D single mode and multimode fiber is simulated using SolidWorks animator that presents it real fiber conditions. Result presents 10 most country searching used of both fiber cables and the difference in users search for both cables. A number of user’s search presents 3% more of multimode than single mode fiber search cases. This research is significant in presenting an animator of single and multimode fiber to users of network infrastructure development especially network developers and Telecommunications Company which can present it lively with animator transitions.</span>

scholarly journals Tuning, Impedance Matching, and Temperature Regulation during High-Temperature Microwave Sintering of Ceramics

2018 ◽  
Vol 2018 ◽  
pp. 1-8 ◽  
Author(s):  
Sylvain Marinel ◽  
Nicolas Renaut ◽  
Etienne Savary ◽  
Rodolphe Macaigne ◽  
Guillaume Riquet ◽  
...  
Keyword(s):  
Material Processing ◽  
High Temperature ◽  
Microwave Sintering ◽  
Impedance Matching ◽  
Single Mode ◽  
Electrical Circuit ◽  
Ease Of Use ◽  
Heating Process ◽  
Process Technology ◽  
Volumetric Heating

Over the years, microwave radiation has emerged as an efficient source of energy for material processing. This technology provides a rapid and a volumetric heating of material. However, the main issues that prevent microwave technology from being widespread in material processing are temperature control regulation and heating distribution within the sample. Most of the experimental works are usually manually monitored, and their reproducibility is rarely evaluated and discussed. In this work, an originally designed 915 MHz microwave single-mode applicator for high-temperature processing is presented. The overall microwave system is described in terms of an equivalent electrical circuit. This circuit has allowed to point out the different parameters which need to be adjusted to get a fully controlled heating process. The basic principle of regulation is then depicted in terms of a block function diagram. From it, the process has been developed and tested to sinter zirconia- and spinel-based ceramics. It is clearly shown that the process can be successfully used to program multistep temperature cycles up to ∼1550°C, improving significantly the reproducibility and the ease of use of this emerging high-temperature process technology.

Robust Reliability Performance of Large size eWLB (Fan-out WLP)

2013 ◽  
Vol 2013 (DPC) ◽  
pp. 001438-001457 ◽  
Author(s):  
Seung Wook Yoon
Keyword(s):  
Form Factor ◽  
Dielectric Materials ◽  
Structural Defects ◽  
Temperature Cycle ◽  
Wafer Level ◽  
Component Level ◽  
Wafer Level Packaging ◽  
Large Size ◽  
Reliability Performance ◽  
Robust Reliability

With reducing form-factor and functional integration of mobile devices, Wafer Level Packaging (WLP) is attractive packaging technology with many advantages in comparison to standard Ball Grid Array (BGA) packages. With the advancement of various fan-out WLP, it is more optimal and promising solution compared to fan-in WLP, because it can offer greater flexibility in design of more IOs, multi-chips, heterogeneous integration and 3D SiP. eWLB (embedded wafer level packaging) is a type of fan-out WLP enabling applications that require smaller form-factor, excellent heat dissipations, thin package profile as it has the potential to evolve in various configurations with proven manufacturing capacity and production yield. This paper discusses the recent advancements of robust reliability performance of large size eWLB. It will also highlight the recent achievement of enhanced component level reliability with advanced dielectric materials. After a parametric study and mechanical simulations, new advanced materials were selected and applied to eWLB. Standard JEDEC tests were carried out to investigate component level reliability of large size (9x9~14x14mm2) test vehicles and both destructive/non-destructive analysis were performed to investigate potential structural defects. Daisychain test vehicles were also tested for drop and TCoB (Temperature Cycle on Board) reliability performance in industry standard test conditions. Besides, this paper will also present a study of package level warpage behaviour with Thermo-Moire measurement.

Susceptor-assisted fast microwave sintering of TiN reinforced SiAlON composites in a single mode cavity

2021 ◽  
Vol 47 (1) ◽  
pp. 828-835
Author(s):  
Özgür Sevgi Canarslan ◽  
Levent Koroglu ◽  
Erhan Ayas ◽  
Necip Suat Canarslan ◽  
Alpagut Kara ◽  
...  
Keyword(s):  
Microwave Sintering ◽  
Single Mode ◽  
Single Mode Cavity

Study of Rhino and Fastship in Calculation of Ship Hydrostatic

2014 ◽  
Vol 539 ◽  
pp. 47-50
Author(s):  
Qian Yuan Gao ◽  
Jing Xi Chen ◽  
Zhao Lei ◽  
Zhi Hui Peng
Keyword(s):  
3D Modeling ◽  
Simple Operation ◽  
Modeling Process

Simple operation of 3D modeling process using Rhino is introduced, taking an 11000DWT bulk cargo ship for example. Calculation of the hydrostatic was carried out in Fastship, and it had been proved that this method is feasible.

scholarly journals Automatic Workflow for Roof Extraction and Generation of 3D CityGML Models from Low-Cost UAV Image-Derived Point Clouds

2020 ◽  
Vol 9 (12) ◽  
pp. 743
Author(s):  
Arnadi Murtiyoso ◽  
Mirza Veriandi ◽  
Deni Suwardhi ◽  
Budhy Soeksmantono ◽  
Agung Budi Harto
Keyword(s):  
3D Modeling ◽  
Low Cost ◽  
Point Clouds ◽  
3D Models ◽  
Additional Advantage ◽  
Planar Surfaces ◽  
Modeling Process ◽  
Point Cloud Segmentation ◽  
Segmentation Approach ◽  
Uav Image

Developments in UAV sensors and platforms in recent decades have stimulated an upsurge in its application for 3D mapping. The relatively low-cost nature of UAVs combined with the use of revolutionary photogrammetric algorithms, such as dense image matching, has made it a strong competitor to aerial lidar mapping. However, in the context of 3D city mapping, further 3D modeling is required to generate 3D city models which is often performed manually using, e.g., photogrammetric stereoplotting. The aim of the paper was to try to implement an algorithmic approach to building point cloud segmentation, from which an automated workflow for the generation of roof planes will also be presented. 3D models of buildings are then created using the roofs’ planes as a base, therefore satisfying the requirements for a Level of Detail (LoD) 2 in the CityGML paradigm. Consequently, the paper attempts to create an automated workflow starting from UAV-derived point clouds to LoD 2-compatible 3D model. Results show that the rule-based segmentation approach presented in this paper works well with the additional advantage of instance segmentation and automatic semantic attribute annotation, while the 3D modeling algorithm performs well for low to medium complexity roofs. The proposed workflow can therefore be implemented for simple roofs with a relatively low number of planar surfaces. Furthermore, the automated approach to the 3D modeling process also helps to maintain the geometric requirements of CityGML such as 3D polygon coplanarity vis-à-vis manual stereoplotting.

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