scholarly journals Advances in beryllium powder consolidation simulation

1998 ◽  
Author(s):  
B.J. Reardon
Keyword(s):  
Powder Consolidation ◽  
Beryllium Powder

scholarly journals Feasibility of Cobalt-Free Nanostructured WC Cutting Inserts for Machining of a TiC/Fe Composite

Materials ◽  
2021 ◽  
Vol 14 (12) ◽  
pp. 3432
Author(s):  
Edwin Gevorkyan ◽  
Mirosław Rucki ◽  
Tadeusz Sałaciński ◽  
Zbigniew Siemiątkowski ◽  
Volodymyr Nerubatskyi ◽  
...  
Keyword(s):  
Cubic Boron Nitride ◽  
Cutting Tools ◽  
Cutting Speed ◽  
Machined Surface ◽  
Powder Consolidation ◽  
Plasma Sintering ◽  
Cutting Inserts ◽  
Spark Plasma ◽  
And Performance ◽  
Nanostructured Tungsten Carbide

The paper presents results of investigations on the binderless nanostructured tungsten carbide (WC) cutting tools fabrication and performance. The scientific novelty includes the description of some regularities of the powder consolidation under electric current and the subsequent possibility to utilize them for practical use in the fabrication of cutting tools. The sintering process of WC nanopowder was performed with the electroconsolidation method, which is a modification of spark plasma sintering (SPS). Its advantages include low temperatures and short sintering time which allows retaining nanosize grains of ca. 70 nm, close to the original particle size of the starting powder. In respect to the application of the cutting tools, pure WC nanostructure resulted in a smaller cutting edge radius providing a higher quality of TiC/Fe machined surface. In the range of cutting speeds, vc = 15–40 m/min the durability of the inserts was 75% of that achieved by cubic boron nitride ones, and more than two times better than that of WC-Co cutting tools. In additional tests of machining 13CrMo4 material at an elevated cutting speed of vc = 100 m/min, binderless nWC inserts worked almost three times longer than WC-Co composites.

scholarly journals Synthesis of Bulk Zr48Cu36Al8Ag8 Metallic Glass by Hot Pressing of Amorphous Powders

2021 ◽  
Vol 5 (1) ◽  
pp. 23
Author(s):  
Tianbing He ◽  
Nevaf Ciftci ◽  
Volker Uhlenwinkel ◽  
Sergio Scudino
Keyword(s):  
Metallic Glass ◽  
Metallic Glasses ◽  
Flow Behavior ◽  
Matrix Composites ◽  
Powder Consolidation ◽  
Low Viscosity ◽  
Flash Annealing ◽  
Amorphous Powders ◽  
Temperature Window ◽  
Glass Matrix Composites

The critical cooling rate necessary for glass formation via melt solidification poses inherent constraints on sample size using conventional casting techniques. This drawback can be overcome by pressure-assisted sintering of metallic glass powders at temperatures above the glass transition, where the material shows viscous-flow behavior. Partial crystallization during sintering usually exacerbates the inherent brittleness of metallic glasses and thus needs to be avoided. In order to achieve high density of the bulk specimens while avoiding (or minimizing) crystallization, the optimal combination between low viscosity and long incubation time for crystallization must be identified. Here, by carefully selecting the time–temperature window for powder consolidation, we synthesized highly dense Zr48Cu36Ag8Al8 bulk metallic glass (BMG) with mechanical properties comparable with its cast counterpart. The larger ZrCu-based BMG specimens fabricated in this work could then be post-processed by flash-annealing, offering the possibility to fabricate monolithic metallic glasses and glass–matrix composites with enhanced room-temperature plastic deformation.

scholarly journals On a Powder Consolidation Problem

2001 ◽  
Vol 62 (1) ◽  
pp. 1-20 ◽  
Author(s):  
C. T. Kelley ◽  
Kristy A. Coffey ◽  
Pierre A. Gremaud ◽  
T. A. Royal
Keyword(s):  
Powder Consolidation

Equal Channel Angular Pressing of Carbon Nanotube Reinforced Metal Matrix Nanocomposites

2006 ◽  
Vol 326-328 ◽  
pp. 325-328 ◽  
Author(s):  
Quang Pham ◽  
Young Gi Jeong ◽  
Soon Hyung Hong ◽  
Hyoung Seop Kim
Keyword(s):  
Equal Channel Angular Pressing ◽  
Metal Matrix ◽  
Powder Processing ◽  
Full Density ◽  
Metal Matrix Nanocomposites ◽  
Powder Consolidation ◽  
Angular Pressing ◽  
Particle Bonding ◽  
Bottle Neck ◽  
Matrix Nanocomposites

In this study, powder processing and severe plastic deformation (SPD) approaches were combined in order to achieve both full density and good particle-matrix bonding in CNT and Cu powder mixtures without grain growth, which was considered as a bottle neck of the bottom-up method in the conventional powder metallurgy of compaction and sintering. Equal channel angular pressing (ECAP), one of the most promising methods in SPD, was used for the powder consolidation. The powder ECAP processing with 1, 2, 4 and 8 passes was conducted at room temperature. It was found by microhardness tests and microstructure characterization that relatively high mechanical strength could be effectively achieved as a result of the well bonded powder contact surface during powder ECAP. The SPD processing of powders is a viable method to achieve both fully density and good particle bonding in CNT-metal matrix nanocomposites.

Characterization of Al Skeletal Structures Fabricated by Ultrasonic Powder Consolidation

2018 ◽  
Vol 49 (12) ◽  
pp. 6173-6184 ◽  
Author(s):  
Zhequn Huang ◽  
Kenji Date ◽  
Kiyoshi Tatsugawa ◽  
Teiichi Ando
Keyword(s):  
Powder Consolidation ◽  
Skeletal Structures

scholarly journals Fabrication of High Aspect Ratio Porous Microfeatures Using Hot Compaction Technique

2008 ◽  
Vol 130 (3) ◽  
Author(s):  
Peng Chen ◽  
Gap-Yong Kim ◽  
Jun Ni
Keyword(s):  
Aspect Ratio ◽  
High Aspect Ratio ◽  
Heat Transfer Performance ◽  
Experimental Setup ◽  
Production Environment ◽  
Taper Angle ◽  
High Productivity ◽  
Powder Consolidation ◽  
Hot Compaction ◽  
High Temperature Operation

High aspect ratio porous microfeatures are becoming more important in the modern industry. However, the fabrication of such features under a mass production environment remains a challenge when robustness, cost effectiveness, and high productivity requirements are required. In this study, the forming of such porous microfeatures using hot compaction was investigated. A hot compaction experimental setup was designed and fabricated that is capable of performing high temperature operation (700°C), quick heatup, and avoiding oxidation. 3D thermal simulation of the experimental setup was conducted to investigate the heat transfer performance and internal temperature distribution, which was then used as a reference for the experiment. Hot compaction experiments were carried out, and the effects of compression force and temperature on the quality in terms of powder consolidation strength and porosity were investigated. In addition, the achievable aspect ratio and taper angle were also discussed.

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