Preparation of Transparent MgAl2O4 Spinel by Pulsed Electric Current Sintering Using Two-step Heating Method

Transparent MgAl2O4 ceramics were fabricated by pulsed electric current sintering (PECS) employing two-step sintering mode. First, nanoscale MgAl2O4 powders were produced by solution combustion synthesis from hydrated nitrate compounds and urea. Subsequently, the synthesized powders were sintered by PECS with a heating rate of 100oC/min under an applied pressure of 100 MPa. The sintering process was conducted according to two-step heating profile. At the first step, the temperature increased to 1050, 1100, and 1150oC, followed by a dwell time of 60 min. The second-step sintering was carried out at 1300, 1350, and 1400oC for 20 min. The transparent ceramics sintered at 1050oC/ 60 min – 1400oC/ 20 min exhibited transmittance over 80% in infrared range. In addition, transparent samples presented a Vickers hardness up to 30 GPa for sintering mode of 1150oC/ 60 min – 1400oC/ 20 min.

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Effect of two-step heating on transparency of MgAl2O4 ceramics fabricated by pulsed electric current sintering process

Journal of Science and Technology of Metal ◽

10.52923/vmfs.jstm.42021.95.02 ◽

2021 ◽

Vol 95 ◽

pp. 11-17

Author(s):

Khanh Dang Quoc ◽

◽

Yen Nguyen Ngoc ◽

Tu Dao Anh ◽

Thang Le Hong ◽

...

Keyword(s):

Grain Size ◽

Electric Current ◽

Ceramic Powder ◽

Second Step ◽

Transparent Ceramics ◽

Sintering Process ◽

Ceramic Samples ◽

Pulsed Electric Current ◽

Step Heating ◽

One Step

In this work, MgAl2O4 transparent ceramics was fabricated from combustion-synthesized nanopowders by pulsed electric current sintering (PECS) combined with two-step sintering. Ceramic powder was densitified using two-step heating, namely the first-step temperature was 1100 oC with holding time of 60 min and the second-step temperatures in range from 1300 oC to 1450 oC with 20 min duration. The results showed that the transparent ceramic samples sintered at 1100 oC/60 min – 1400 oC/20 min had grain size of 177 ± 8 nm, relative density about 99 %, transmittance up to 80 %, and Vickers hardness of 18 GPa. These values were higher than that of samples obtained by one-step sintering at 1400 oC.

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DENSIFICATION AND MECHANICAL PROPERTIES OF FeMn13-TiC COMPOSITE FABRICATED BY PULSED ELECTRIC CURRENT SINTERING PROCESS

Acta Metallurgica Slovaca ◽

10.12776/ams.v24i4.1195 ◽

2018 ◽

Vol 24 (4) ◽

pp. 273 ◽

Cited By ~ 1

Author(s):

Khanh Quoc Dang ◽

Quang Anh Hoang ◽

Hiep Van Tran ◽

Minh Cong Nguyen ◽

Hao Van Pham ◽

...

Keyword(s):

Mechanical Properties ◽

Relative Density ◽

Electric Current ◽

Sintering Temperature ◽

Applied Pressure ◽

Sintering Process ◽

X Ray Diffraction ◽

X Ray ◽

Pulsed Electric Current ◽

Different Temperatures

In the present work, FeMn13-40 wt.% TiC composite was fabricated by Pulsed Electric Current Sintering (PECS) process at different temperatures between 990 and 1020<sup>o</sup>C under a pressure of 60 MPa with a holding time of 5 min in the vacuum. Phases identification was done using the X-ray diffraction. The relative density, microstructure and hardness of the samples were characterized. The results showed that the relative density of FeMn13-TiC composite increased with the increase of sintering temperature. The highest relative density (96.19%) and the hardness (70.54 HRC) of the sample were achieved by PECS process, namely sintering at the temperature of 1020<sup>o</sup>C under the applied pressure of 60 MPa for 5 min.

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223 Solid Bonding of Aluminum alloy amd Mild Steel by Pulsed Electric-Current Sintering Process

The Proceedings of the Materials and processing conference ◽

10.1299/jsmemp.2001.9.301 ◽

2001 ◽

Vol 2001.9 (0) ◽

pp. 301-302

Author(s):

Shogo TOMIDA ◽

Takekazu NAGAE ◽

Kazuhiro NAKATA ◽

Shigeoki SAJI ◽

Susumu KATO

Keyword(s):

Aluminum Alloy ◽

Mild Steel ◽

Electric Current ◽

Sintering Process ◽

Pulsed Electric Current

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Binder-Free Tungsten Carbide Fabricated by Pulsed Electric Current Sintering

Materials Science Forum ◽

10.4028/www.scientific.net/msf.534-536.1153 ◽

2007 ◽

Vol 534-536 ◽

pp. 1153-1156 ◽

Cited By ~ 2

Author(s):

Koji Shimojima ◽

Hiroyuki Hosokawa ◽

Takeshi Nakajima ◽

Masahiko Mizukami ◽

Yoshiharu Yamamoto

Keyword(s):

Mechanical Properties ◽

Tungsten Carbide ◽

Electric Current ◽

Applied Pressure ◽

High Hardness ◽

Maximum Temperature ◽

Pulsed Electric Current ◽

Binder Free ◽

Field Assisted Sintering ◽

Sintering Condition

In this paper, we show some experimental results of binder-free WC sintered by Pulsed Electric Current Sintering (PECS) also known as Field Assisted Sintering Technology (FAST). These binder-free WC have extremely high hardness and stiffness. However, these mechanical properties are dependent on the sintering condition, e.g., maximum temperature, applied pressure, etc. We show some relationship between mechanical properties and sintering condition to improve to sinter the binder-free WC.

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Electric Current Activation of Sintering: A Review of the Pulsed Electric Current Sintering Process

Journal of the American Ceramic Society ◽

10.1111/j.1551-2916.2010.04210.x ◽

2010 ◽

Vol 94 (1) ◽

pp. 1-19 ◽

Cited By ~ 439

Author(s):

Zuhair A. Munir ◽

Dat V. Quach ◽

Manshi Ohyanagi

Keyword(s):

Electric Current ◽

Sintering Process ◽

Pulsed Electric Current ◽

Current Activation

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The Synthesis and Characteristics of Homogenously Dispersed CNT-Al2O3 Nanocomposites by the Thermal CVD Method and Pulsed Electric Current Sintering Process

Solid State Phenomena ◽

10.4028/www.scientific.net/ssp.121-123.295 ◽

2007 ◽

Vol 121-123 ◽

pp. 295-298 ◽

Cited By ~ 1

Author(s):

S.H. Yoo ◽

J.K. Yang ◽

Sung Tag Oh ◽

Kae Myung Kang ◽

Sung Goon Kang ◽

...

Keyword(s):

Electric Current ◽

Selective Reduction ◽

Chemical Vapor ◽

Metal Catalyst ◽

Sintering Process ◽

Composite Powders ◽

Reduction Processes ◽

Pulsed Electric Current ◽

Nanocomposite Powders ◽

Pulse Electric

An optimum route to synthesize Al2O3-based composite powders with a homogeneous dispersion of carbon nanotubes (CNTs) was investigated. CNT/Metal/Al2O3 nanocomposite powders were fabricated by thermal chemical vapor deposition (CVD) over a metal catalyst homogeneously dispersed into an Al2O3 matrix by the means of chemical and selective reduction processes. The nanocomposite powders were densified by Pulse Electric Current Sintering (PECS). The experimental results show that the CNT/Metal/Al2O3 nanocomposites have unique electrical properties.

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