Process Development and Material Characterization for the Novel Melt Processing of Near Net Shape Foam Parts

2001 ◽  
Author(s):  
Dietmar Leitlmeier ◽  
Herbert Flankl
Keyword(s):  
Material Characterization ◽  
Process Development ◽  
Melt Processing ◽  
The Novel ◽  
Near Net Shape

Failure Types & Analysis In Cu Process Development of Design-Rule 0.18μm CPU

2001 ◽  
Author(s):  
DongKwon Jeong ◽  
JuHyeon Ahn ◽  
SangIn Lee ◽  
JooHyuk Chung ◽  
ByungLyul Park ◽  
...  
Keyword(s):  
Process Improvement ◽  
Process Development ◽  
Metal Corrosion ◽  
Pass Rate ◽  
Design Rule ◽  
The Novel ◽  
Corrosion Loss ◽  
Barrier Metal ◽  
Development State ◽  
Failure Types

Abstract This paper presents the problems, the solutions, and the development state of the novel 0.18 μm Cu Metal Process through failure analysis of the Alpha CPU under development at Samsung Electronics. The presented problems include : “Via Bottom Lifting” induced by the Cu Via void, “Via Bottom dissociation” due to the IMD stress, “Via side dissociation” due to the poor formation of the Barrier Metal, “Via short/not-open failure” due to the IMD lifting, and Cu metal Corrosion/Loss. The analysis was carried out on the Via Contact Test Chain Patterns, using the “Electron (ION) Charge Up” method. After carefully analyzing each of the failure types, process improvement efforts followed. As a result, the pass rate of the via contact Rc was brought up from a mere 20% to 95%, and the device speed higher than 1.1 GHz was achieved, which surpasses the target speed of 1 GHz.

Sulfuration–desulfuration reaction sensing effect of intrinsic ZnO nanowires for high-performance H2S detection

2015 ◽  
Vol 3 (12) ◽  
pp. 6330-6339 ◽  
Author(s):  
Haiyun Huang ◽  
Pengcheng Xu ◽  
Dan Zheng ◽  
Chuanzhao Chen ◽  
Xinxin Li
Keyword(s):  
Theoretical Analysis ◽  
Material Characterization ◽  
High Performance ◽  
Nanowire Array ◽  
Zno Nanowires ◽  
The Novel ◽  
Zno Nanowire ◽  
Trace Level ◽  
Designed Experiments ◽  
H2s Detection

This study presents a novel sulfuration–desulfuration sensing effect of an intrinsic (i.e., uncatalyzed) ZnO nanowire array for trace-level detection of H2S. The novel H2S sensing mechanism is clarified by specifically designed experiments, material characterization and theoretical analysis.

scholarly journals Microstructural Evolution and Mechanical Properties of Hybrid Bevel Gears Manufactured by Tailored Forming

Metals ◽  
2020 ◽  
Vol 10 (10) ◽  
pp. 1365
Author(s):  
Bernd-Arno Behrens ◽  
Anna Chugreeva ◽  
Julian Diefenbach ◽  
Christoph Kahra ◽  
Sebastian Herbst ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Tensile Tests ◽  
The Novel ◽  
Bevel Gears ◽  
Processing Step ◽  
Near Net Shape ◽  
Manufacturing Technologies ◽  
Plasma Transferred Arc Welding ◽  
Tailored Forming ◽  
Processing Steps

The production of multi-metal bulk components requires suitable manufacturing technologies. On the example of hybrid bevel gears featuring two different steels at the outer surface and on the inside, the applicability of the novel manufacturing technology of Tailored Forming was investigated. In a first processing step, a semi-finished compound was manufactured by cladding a substrate using a plasma transferred arc welding or a laser hotwire process. The resulting semi-finished workpieces with a metallurgical bond were subsequently near-net shape forged to bevel gears. Using the residual heat after the forging process, a process-integrated heat treatment was carried out directly after forming. For the investigations, the material combinations of 41Cr4 with C22.8 (AISI 5140/AISI 1022M) and X45CrSi9-3 with C22.8 (AISI HNV3/AISI 1022M) were applied. To reveal the influence of the single processing steps on the resulting interface, metallographic examinations, hardness measurements and micro tensile tests were carried out after cladding, forging and process-integrated heat treatment. Due to forging and heat-treatment, recrystallization and grain refinement at the interface and an increase in both, hardness and tensile strength, were observed.

Simulation and Experiment Study of Chain Aggregate Structure in Magnetic Fluid

2019 ◽  
Vol 201 (1) ◽  
pp. 110-119
Author(s):  
Yu Ying ◽  
Ke Xu ◽  
Guang-Yuan Si ◽  
Ji-Zhong Zhao
Keyword(s):  
Magnetic Fluid ◽  
Material Characterization ◽  
Magnetic Nanoparticle ◽  
Magnetic Particles ◽  
Low Cost ◽  
Experimental Setup ◽  
The Novel ◽  
Functional Material ◽  
Experiment Study ◽  
Simulation And Experiment

Magnetic fluid is a novel magnetic functional material. The magneto-optical properties are displayed due to the tunability. In the paper, the material characterization was studied theoretically and experimentally. In the simulation, a rod-like magnetic nanoparticle model was used to simulate the motion of the magnetic particles. In the experiment, an experimental setup was designed to observe the change of the microstructure. The results showed that the magnetic particles can be aggregated to form several magnetic chains when the applied magnetic field exceeded 100 Oe. The novel magneto-optical device exhibits advantages of low cost, small size, and easy formation.

scholarly journals Land Based Turbine Casting Initiative

1997 ◽  
Author(s):  
Boyd A. Mueller ◽  
Allen R. Price ◽  
Kenneth S. Murphy ◽  
Gregory B. Bell
Keyword(s):  
Single Crystal ◽  
Gas Turbine ◽  
Process Development ◽  
Casting Process ◽  
Melt Processing ◽  
Department Of Energy ◽  
Inspection System ◽  
X Ray ◽  
Process Factors ◽  
Low Sulfur

Howmet is currently conducting a Department of Energy funded Advanced Turbine Systems program, the Land Based Turbine Casting Initiative, to scale single crystal casting technological advances developed for aircraft gas turbine engines up to land based gas turbine sized components. The program encompasses technical activities in the areas of: low sulfur alloys (low sulfur melt processing treatments), casting process development (casting process, mold, core and wax), post-cast process development (mold, core, and gating removal, heat treatment, HIP, and inspection), and casting defect tolerance level establishment (freckles, off-orientation, low angle boundaries, and recrystallized grains). This presentation will highlight recent progress in the areas of low sulfur alloy, large single crystal casting process development, and 2.5D reconstruction X-ray inspection system development. Howmet has developed a melt treatment to reduce the sulfur content of the nickel-based superalloy ingot it manufactures. Sulfur contents achieved with this technique will be compared to sulfur levels present in currently available ingot. The effect of the reduced sulfur contents on oxidation performance is being investigated and will be reported. The casting process development activities are foundry experiments to determine the effect of different process factors on both grain and dimensional quality. The status of casting activities to scale aeroengine processes up to land based sized components will be presented. The 2.5D reconstruction uses X-ray metrology and multiple 2D X-ray views of the casting to reconstruct the 3D geometry of selected features. The large cross sections and long path lengths inherent in large utility land based components will be particularly challenging.

scholarly journals ECO-FRIENDLY PROCESSES FOR BIODIESEL PRODUCTION FROM NON-EDIBLE OILS

2013 ◽  
Vol 3 (1) ◽  
Author(s):  
Ivana Banković-Ilić ◽  
Olivera Stamenković ◽  
Vlada Veljković
Keyword(s):  
Vegetable Oils ◽  
Heterogeneous Catalysts ◽  
Process Development ◽  
Edible Oils ◽  
Continuous Process ◽  
Biodiesel Production ◽  
Waste Materials ◽  
The Novel ◽  
Economic Aspects ◽  
Biodiesel Synthesis

At present, edible vegetable oils are most often used feedstocks for industrial biodiesel production. In this paper, the various non-edible oils and usually used processes for biodiesel production are analyzed from the ecological and economic aspects. The aim of the paper is to present the possibilities for improving the biodiesel synthesis by employing the heterogeneous catalysts, the novel catalysts obtained from waste materials and continuous process development, especially taking into account their impact on the environment. Key words:alcoholysis, biodiesel, non-edible oils.

scholarly journals Processing of Alnico Magnets by Additive Manufacturing

2019 ◽  
Vol 9 (22) ◽  
pp. 4843 ◽  
Author(s):  
Emma White ◽  
Emily Rinko ◽  
Timothy Prost ◽  
Timothy Horn ◽  
Christopher Ledford ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Additive Manufacturing ◽  
Grain Orientation ◽  
Permanent Magnets ◽  
Process Development ◽  
Great Sensitivity ◽  
Developmental Study ◽  
Traction Drive ◽  
Near Net Shape ◽  
Graded Structures

Permanent magnets without rare earth (RE) elements, such as alnico, will improve supply stability and potentially decrease permanent magnet cost, especially for traction drive motors and other increased temperature applications. Commercial alnico magnets with the highest energy product are produced by directional solidification (DS) to achieve a <001> columnar grain orientation followed by significant final machining, adding to the high cost. Additive manufacturing (AM) is an effective method to process near net-shape parts with minimal final machining of complex geometries. AM also, has potential for texture/grain orientation control and compositionally graded structures. This report describes fabrication of alnico magnets by AM using both laser engineered net shaping (LENS)/directed energy deposition (DED) and electron beam melting powder bed fusion (EBM/PBF). High pressure gas atomized (HPGA) pre-alloyed alnico powders, with high purity and sphericity, were built into cylindrical and rectangular samples, followed by magnetic annealing (MA) and a full heat treatment (FHT). The magnetic properties of these AM processed specimens were different from their cast and sintered counterparts of the same composition and show a great sensitivity to heat treatment. The AM process parameters used in this developmental study did not yet result in any preferred texture within the alnico AM builds. These findings demonstrate feasibility for near net-shape processing of alnico permanent magnets for use in next generation traction drive motors and other applications requiring increased operating temperatures and/or complex engineered part geometries, especially with further AM process development for texture control.

Process development and material characterization of Cu-Cu thermo-compression bonding (TCB) for high-conductivity electrical interconnects.

2016 ◽  
Vol 2016 (1) ◽  
pp. 000203-000208 ◽  
Author(s):  
Adeel Bajwa ◽  
Niteesh Marathe ◽  
SivaChandra Jangam ◽  
Saptadeep Pal ◽  
Ping-Yu Liu ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Parameter Optimization ◽  
Electrical Resistance ◽  
Material Characterization ◽  
Process Development ◽  
Intermetallic Formation ◽  
Physical Mechanisms ◽  
Electrical Interconnects ◽  
Metal Metal

Abstract In this work, we focus on metal-metal Thermo-Compression Bonding (TCB) for realizing assembly of dielets to a silicon interconnect fabric (IF). The popular metal choices include bare Cu, Cu plated with Au and Au. Our approach simplifies the metallurgies used in classic chip-to-package assemblies by avoiding the use of solder and the concomitant issues of intermetallic formation such as electrical resistance and brittleness. In this paper, we address TCB parameter optimization and material characteristics of these metal-metal TCB joints. The roles of two physical mechanisms on Cu-Cu interface voiding i.e. surface roughness prior to TCB, oxide presence at bonding interface are evaluated in detail.

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