The Ni3Al–Al2O3/TiC cermet formation behavior with TiH2 base ball-milled powders with Ni, Al, and C during spark plasma sintering

2010 ◽  
Vol 36 (6-7) ◽  
pp. 785-793
Author(s):  
Dong-Woong Kim ◽  
Sung-Hyun Choi ◽  
Kyoung-Rok Do ◽  
Su-Gun Lim ◽  
In-Shup Ahn
Keyword(s):  
Spark Plasma Sintering ◽  
Plasma Sintering ◽  
Formation Behavior ◽  
Spark Plasma ◽  
Tic Cermet ◽  
Milled Powders

scholarly journals Spark Plasma Sintering Behavior of Nb-Mo-Si Alloy Powders Fabricated by Hydrogenation-Dehydrogenation Method

Materials ◽  
2019 ◽  
Vol 12 (21) ◽  
pp. 3549 ◽  
Author(s):  
Sung Lee ◽  
Ki Park ◽  
Jang-Won Kang ◽  
Yanghoo Kim ◽  
Hyun-Su Kang ◽  
...  
Keyword(s):  
Spark Plasma Sintering ◽  
Sintering Temperature ◽  
Sintering Behavior ◽  
Powder Metallurgy Method ◽  
Composite Powders ◽  
Plasma Sintering ◽  
Formation Behavior ◽  
Spark Plasma ◽  
Two Phases ◽  
Nb5si3 Phase

In this study, the sintering behaviors of Nb-6Mo-20Si-3Cr (at percentage) in situ composite powders were studied. The Nb alloy powder was fabricated by a hydrogenation-dehydrogenation method, and both the alloy ingot and powders consisted of two phases: An Nb metal phase and the α-Nb5Si3 phase. Consolidation of the alloy powders was performed at 1500, 1600, and 1700 °C using spark plasma sintering, and the microstructures and phases formed at various sintering temperatures were analyzed. Micropores were observed in the compact sintered at 1500 °C due to the lack of complete densification at that temperature. The densification was completed at 1600 °C and the microstructure was slightly coarsened at 1700 °C compared to the microstructure of the compact sintered at 1600 °C. The microstructures prepared by the powder metallurgy method were finer than the microstructure of the ingot prepared by the casting method. The phase formation behavior varied according to the sintering temperature. Specifically, the α-Nb5Si3 phase, which is a stable structure of the Nb5Si3 phase at a low temperature, was transformed to the β-Nb5Si3 phase (which is stable at a high temperature) with an increasing sintering temperature.

scholarly journals The Densification Properties of Distaloy AE-TiC Cermet by Spark Plasma Sintering

2007 ◽  
Vol 14 (4) ◽  
pp. 230-237
Author(s):  
Ho-Jung Cho ◽  
In-Shup Ahn ◽  
Young-Hee Lee ◽  
Dong-Kyu Park
Keyword(s):  
Spark Plasma Sintering ◽  
Plasma Sintering ◽  
Spark Plasma ◽  
Tic Cermet

scholarly journals Study of harmonic microstructure development during Spark Plasma Sintering (SPS) of β-CEZ titanium alloy

2020 ◽  
Vol 321 ◽  
pp. 12022
Author(s):  
Benoît Denand ◽  
Bhupendra Sharma ◽  
Guillaume Geandier ◽  
Guy Dirras ◽  
Kei Ameyama ◽  
...  
Keyword(s):  
Titanium Alloy ◽  
Thermal Treatment ◽  
Spark Plasma Sintering ◽  
High Energy ◽  
Initial Powder ◽  
Surface Areas ◽  
Plasma Sintering ◽  
Strain Induced Martensite ◽  
Spark Plasma ◽  
Milled Powders

The present study focuses on the formation of harmonic microstructures in a metastable β titanium alloy, the β-Cez alloy (Tβ =890°C). Previous studies showed that harmonic structures obtained by a powder metallurgy route led to an increase in mechanical properties. In this study, the harmonic structure was obtained after a Mechanical Milling of the Initial Powder followed by Spark Plasma Sintering. The phase transformations occurring in the Initial Powder and Mechanical Milled powders during a heat treatment similar to the SPS one were studied. Electrical resistivity, high energy XRD and SEM-EBSD were used to characterize the evolution of phases and microstructures and highlight the effect of the thermal treatment and the milling. It was shown that after thermal treatment of Mechanical Milled powders, a harmonic α + β microstructure is obtained consisting of nodular α grains in the powder shell and α lamellae in the powder core. The stress/strain induced martensite formed during the milling associated with the heavier deformation at the powder surface areas contributes highly to the formation of network arrangement of nodular α grains by a recovery/recrystallization phenomenon of β and α phases during the heating.

The Phase Evolution of the TiC Cermet Fabricated by Spark Plasma Sintering

2007 ◽  
pp. 2755-2760
Author(s):  
In Shup Ahn ◽  
Sung Yeal Bae ◽  
Tek Kyung Sung ◽  
Dong Kyu Park
Keyword(s):  
Spark Plasma Sintering ◽  
Phase Evolution ◽  
Plasma Sintering ◽  
Spark Plasma ◽  
Tic Cermet

Influence of excess alumina on mullite synthesized from pyrophyllite by spark plasma sintering

Clay Minerals ◽  
2020 ◽  
Vol 55 (2) ◽  
pp. 166-171
Author(s):  
Rasidi Sule ◽  
Iakovos Sigalas
Keyword(s):  
Fracture Toughness ◽  
Spark Plasma Sintering ◽  
Glassy Phase ◽  
Attrition Mill ◽  
Plasma Sintering ◽  
Spark Plasma ◽  
Milled Powders

AbstractThe influence of excess Al2O3 on 3:2 mullite produced from α-Al2O3 and pyrophyllite powder was examined. A mixture consisting of 28 wt.% dehydroxylated pyrophyllite and 72 wt.% α-Al2O3 was milled in an attrition mill. The milled powders were sintered by spark plasma sintering (SPS) at 1600°C for 10, 20 and 30 min. Subsequently, the samples were heated at 1350°C for 2 h to determine the influence of the excess Al2O3 on the microstructure. No glassy phase was detected in the sample containing 72 wt.% Al2O3 and sintered at 1600°C for 20 min. The sample with 72 wt.% Al2O3 had greater hardness and fracture toughness compared to 3:2 mullite. The greatest hardness and fracture toughness of 12.43 GPa and 2.71 MPa m–0.5, respectively, were obtained in the sample containing 72 wt.% Al2O3 sintered at 1600°C for 20 min.

scholarly journals Spark Plasma Sintering of Mg-Based Amorphous Ball-Milled Powders

2009 ◽  
Vol 50 (3) ◽  
pp. 588-591 ◽  
Author(s):  
François O. Méar ◽  
Guoqiang Xie ◽  
Dmitri V. Louzguine-Luzgin ◽  
Akihisa Inoue
Keyword(s):  
Spark Plasma Sintering ◽  
Plasma Sintering ◽  
Spark Plasma ◽  
Milled Powders

Preparation by Spark Plasma Sintering and Investigation of Inert Anode for Aluminum Electrolysis

2012 ◽  
Vol 503-504 ◽  
pp. 560-563
Author(s):  
Guo Dong Zhang ◽  
Zhi Min He ◽  
Jian Qiang Zhang ◽  
Fu Ju Zhang
Keyword(s):  
Spark Plasma Sintering ◽  
Inert Anode ◽  
Aluminum Electrolysis ◽  
Sintering Process ◽  
Plasma Sintering ◽  
Ni Alloy ◽  
Spark Plasma ◽  
Three Stages ◽  
Best Parameters ◽  
Milled Powders

Spark plasma sintering was used to prepare Fe-Ni (Cu-41.32wt.% Cr) alloy in order to enhance the properties as inert anode for aluminum electrolysis. The effect of different sintering processes on the microstructures and properties of Fe-Ni alloy were studied by OM, SEM and EDS. The results show that the sintering process of milled powders can be divided into three stages: particles bonding, sintering neck growing, closed pole gap becoming spherical and narrowing. The SPS process of milled powders has some advantages of reacting at lower temperatures, completing faster and being densified easier than ordinary sintering. The density of Fe-Ni sample is improved and porosity is decreased as the sintering temperature is increased and holding time is extended. 1273K and 5min are the best parameters.

Fabrication of Nb-Based Alloy via Spark Plasma Sintering

2012 ◽  
Vol 557-559 ◽  
pp. 38-41
Author(s):  
De Zhi Zhang ◽  
Ming Li Qin ◽  
Lin Zhang ◽  
Xin Lu ◽  
Xuan Hui Qu
Keyword(s):  
Mechanical Properties ◽  
Spark Plasma Sintering ◽  
Milled Powder ◽  
Blended Powder ◽  
Plasma Sintering ◽  
Spark Plasma ◽  
Powder Compacts ◽  
Bulk Alloys ◽  
Full Densification ◽  
Milled Powders

Nb-5 at.% W-5 at.% Mo-2 at.%Zr-2 at.% C (Nb5522) bulk alloys were prepared using blended powders or ball-milled powders via spark plasma sintering. The differences between blended powder compacts and ball milled powder compacts with respect to their density, microstructure and mechanical properties were studied. The results showed that ball milling enhances the sinterability of Nb5522 powders. After sintered by SPS at 1873 K, the milled powders achieved a near-full densification density. The SPS process favors the precipitation of (Nb, Zr)C particles.

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