Rapid Sintering of Nanostructured WC-Graphene Composites and Their Mechanical Properties

2020 ◽  
Vol 20 (7) ◽  
pp. 4436-4439
Author(s):  
Seong-Eun Kim ◽  
Jin-Kook Yoon ◽  
In-Jin Shon
Keyword(s):  
Mechanical Properties ◽  
Fracture Toughness ◽  
High Frequency ◽  
Second Phase ◽  
Ductile Brittle Transition Temperature ◽  
Reinforcing Agent ◽  
Current Concern ◽  
Rapid Sintering ◽  
Sintering Method ◽  
High Frequency Induction

The current concern about WC focuses on its low fracture toughness below the ductile-brittle transition temperature despite its many attractive properties. To improve its mechanical properties, the approach generally utilized has been the addition of a second phase to form composites and to make nanostructured materials. In this paper, graphene was evaluated as the reinforcing agent in WC ceramics using a novel sintering method (high-frequency induction heated sintering method). Highly dense nanostructured WC and WC-graphene composites were obtained within two min at 1550 °C. The effect of graphene on the grain size and the mechanical properties (hardness and fracture toughness) of WC-graphene composites was evaluated.

FABRICATION OF NANOSTRUCTURED WC-BASED HARD MATERIALS WITH DIFFERENT CONTENTS OF Co BY HIGH FREQUENCY INDUCTION HEATED SINTERING

2010 ◽  
Vol 17 (02) ◽  
pp. 251-255
Author(s):  
DUCK-SOO KANG ◽  
KEE-DO WOO ◽  
EUI-PYO KWON ◽  
SANG-HYUK KIM ◽  
MIN-SEOK MOON ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Fracture Toughness ◽  
High Frequency ◽  
Cutting Tool ◽  
Hard Material ◽  
Hard Materials ◽  
Sintering Time ◽  
Rapid Sintering ◽  
Sintering Method ◽  
High Frequency Induction

Hard materials, in particular tungsten carbide ( WC ) hard material has been used in many industries as cutting tool and abrasive materials. For improving toughness, binders are added into carbide materials. The effect of Co as binder on the mechanical properties in the nanosized WC was discussed. The hardness and fracture toughness were also investigated using 30 kgf load Vickers indenter. The nanosized WC-8 , 10 and 12 vol.% Co composites were successfully fabricated without grain growth by high frequency induction heated sintering (HFIHS), which is the rapid sintering method, due to short sintering time 1140°C. The nanosized WC–Co composites fabricated by HFIHS have better mechanical properties than WC–Co composite fabricated by commercial sintering.

Simultaneous Synthesis and Densification of Nanostructured NbSi2-SiC-Si3N4 by Rapid Sintering

2010 ◽  
Vol 123-125 ◽  
pp. 209-212
Author(s):  
In Jin Shon ◽  
Hyun Su Kang ◽  
Soo Kyung Bae ◽  
In Yong Ko
Keyword(s):  
Mechanical Properties ◽  
Fracture Toughness ◽  
High Frequency ◽  
Induced Current ◽  
Simultaneous Application ◽  
Average Grain Size ◽  
Rapid Sintering ◽  
One Step ◽  
Simultaneous Synthesis ◽  
High Frequency Induction

A dense nanostructured 5NbSi2-SiC-Si3N4 composite was synthesized by the high-frequency induction-heated combustion synthesis (HFIHCS) method within 1 minute in one step from mechanically activated powders of 4NbN, NbC and 14Si. A highly dense 5NbSi2-SiC-Si3N4 composite with relative density of up to 98% was produced under the simultaneous application of a pressure of 80 MPa and the induced current. The average grain size and mechanical properties (hardness and fracture toughness) of the composite were investigated.

The Effect of BN Reinforcement on the Mechanical Properties of Nanostructured Al2O3 Ceramics

2020 ◽  
Vol 20 (7) ◽  
pp. 4353-4357 ◽  
Author(s):  
Seong-Eun Kim ◽  
Woo-Jin Cho ◽  
Jin-Kook Yoon ◽  
In-Jin Shon
Keyword(s):  
Mechanical Properties ◽  
Fracture Toughness ◽  
Grain Size ◽  
Transition Temperature ◽  
Composite Materials ◽  
Pulsed Current ◽  
Nanostructured Composite ◽  
Reinforcing Agent ◽  
Rapid Sintering ◽  
Sintering Method

In spite of many attractive properties, the low fracture toughness of Al2O3 ceramic below ductilebrittle transition temperature limits its wide application in industry. One of the most obvious methods to improve the fracture toughness has been to add reinforcing compounds to fabricate nanostructured composite materials. In this respect, BN was evaluated as the reinforcing agent of Al2O3 ceramics using pulsed current activated sintering (PCAS). Highly dense alumina-BN composites with a relative density of up to 100% were achieved within short periods (2 min) by PCAS under a 80 MPa pressure. The rapid sintering method allowed the retention of the nanostructure by inhibiting the grain growth. The grain size of alumina was reduced remarkably by the addition of BN. The addition of BN to Al2O3 ceramic simultaneously improved the hardness and fracture toughness of alumina-BN composite.

Mechanical Properties and Rapid Sintering of Nanostructured WC-Al2O3-Al Hard Materials

2021 ◽  
Vol 21 (7) ◽  
pp. 3929-3933
Author(s):  
Seong-Eun Kim ◽  
In-Jin Shon
Keyword(s):  
Mechanical Properties ◽  
Fracture Toughness ◽  
Grain Growth ◽  
High Frequency ◽  
Theoretical Density ◽  
Hard Materials ◽  
Rapid Sintering ◽  
High Frequency Induction

Nanostructured WC-Al2O3-Al composites was sintered using rapid high-frequency induction heated sintering (HFIHS) and the mechanical properties such as hardness and fracture toughness with consolidation were investigated. The HFIHS method induced a very fast densification nearly at the level of theoretical density and successfully prohibited grain growth, resulting in nano-sized grains. The fracture toughness was improved due to the consolidation facilitated by adding Al to WC-Al2O3 matrix. The WC-Al2O3 composites added with 5 and 10 vol.% Al showed higher hardness and fracture toughness compared with that of WC-Al2O3.

scholarly journals Mechanochemical Synthesis and Rapid Consolidation of Nanocrystalline 3NiAl-Al2O3Composites

2011 ◽  
Vol 2011 ◽  
pp. 1-5 ◽  
Author(s):  
In-Jin Shon ◽  
In-Yong Ko ◽  
Seung-Hoon Jo ◽  
Jung-Mann Doh ◽  
Jin-Kook Yoon ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Fracture Toughness ◽  
Mechanochemical Synthesis ◽  
High Frequency ◽  
Nanocrystalline Materials ◽  
Physical And Mechanical Properties ◽  
High Energy ◽  
Reinforced Composite ◽  
Energy Ball ◽  
High Frequency Induction

Nanopowders of 3NiAl and Al2O3were synthesized from 3NiO and 5Al powders by high-energy ball milling. Nanocrystalline Al2O3reinforced composite was consolidated by high-frequency induction-heated sintering within 3 minutes from mechanochemically synthesized powders of Al2O3and 3NiAl. The advantage of this process is that it allows very quick densification to near theoretical density and inhibition grain growth. Nanocrystalline materials have received much attention as advanced engineering materials with improved physical and mechanical properties. The relative density of the composite was 97%. The average Vickers hardness and fracture toughness values obtained were 804 kg/mm2and 7.5 MPa⋅m1/2, respectively.

Consolidation and Mechanical Properties of Nanostructured SiC from Mechanically Activated Powder by High-Frequency Induction-Heated Sintering

2010 ◽  
Vol 123-125 ◽  
pp. 635-638
Author(s):  
In Jin Shon ◽  
Hyun Su Kang ◽  
Na Ra Park ◽  
In Yong Ko
Keyword(s):  
Mechanical Properties ◽  
High Frequency ◽  
Sintering Behavior ◽  
Hard Material ◽  
Induced Current ◽  
Sintering Process ◽  
Simultaneous Application ◽  
Hard Materials ◽  
Rapid Sintering ◽  
High Frequency Induction

The rapid sintering of nanostuctured SiC hard materials was investigated with high-frequency induction heating sintering process. The advantage of this process is that it allows very quick densification to near theoretical density and prohibition of grain growth in nanostuctured materials. A dense nanostructured SiC hard material was produced with simultaneous application of 500 MPa pressure and induced current within 2 minutes. The effect of the ball milling times on the sintering behavior, grain size and mechanical properties of binderless SiC was investigated.

The Effect of Holding Time on the Mechanical Properties and Microstructure of Sintered NbC Composite

2010 ◽  
Vol 123-125 ◽  
pp. 803-806
Author(s):  
Duck Soo Kang ◽  
Kee Do Woo ◽  
Sang Hyuk Kim ◽  
In Jin Shon ◽  
Ji Young Kim ◽  
...  
Keyword(s):  
Grain Size ◽  
Relative Density ◽  
High Frequency ◽  
Holding Time ◽  
Full Width ◽  
Petch Relation ◽  
Sintering Time ◽  
Rapid Sintering ◽  
Sintering Method ◽  
High Frequency Induction

High frequency induction heated sintering (HFIHS) method is one of the rapid sintering methods. The advantage of rapid sintering method is that grain growth can be prevented during sintering at high temperature. Refinement of grains was known to increase the yield and flow stresses of crystals. The relation between the yield stress and the grain size is known as Hall-Petch relation. NbC-10vol.%Co, Ni and Fe composites were fabricated by HFIHS at 1060°C for 0 and 3 min as holding times under a pressure of 80MPa.The relative density of NbC-10vol.%Co, Ni and Fe composites which were sintered at 1060°C for 0min as holding time under 80MPa were 91.90%, 91.26% and 91.26%, respectively. These composites are difficult to use industrial parts due to low relative density. The longer sintering time was conducted for increasing relative density in this study. Nano-sized specimens, which were calculated grain size by full-width at half maximum (FWHM), can be obtained by HFIHS. The value of hardness and fracture toughness was investigated using 20kgf load Vickers indenter.

Rapid sintering of ultra fine WC and WC-Co hard materials by high-frequency induction heated sintering and their mechanical properties

2007 ◽  
Vol 13 (1) ◽  
pp. 39-45 ◽  
Author(s):  
Hwan-Cheol Kim ◽  
In-Jin Shon ◽  
In-Kyoon Jeong ◽  
In-Yong Ko ◽  
Jin-Kook Yoon ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
High Frequency ◽  
Hard Materials ◽  
Rapid Sintering ◽  
High Frequency Induction

Mechanical Properties and Consolidation of WC-8wt.%Ni Hard Materials by HFIHS and PCAS

2007 ◽  
Vol 124-126 ◽  
pp. 1153-1156 ◽  
Author(s):  
In Kyoon Jeong ◽  
Hwan Cheol Kim ◽  
Jung Mann Doh ◽  
Jin Kook Yoon ◽  
In Yong Ko ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Fracture Toughness ◽  
Particle Size ◽  
Grain Size ◽  
High Frequency ◽  
Sintering Behavior ◽  
Pulsed Current ◽  
Hard Materials ◽  
Short Time ◽  
High Frequency Induction

Two methods, High-Frequency Induction-Heated Sintering (HFIHS) and Pulsed Current Activated Sintering (PCAS), were utilized to consolidate WC-8wt.%Ni hard materials. The demonstrated advantages of these processes are rapid densification to near theoretical density in a relatively short time and with insignificant change in grain size. The hardness, fracture toughness, and the relative density of the dense WC–8Ni composites produced by HFIHS and PCAS were investigated. And the effect of variation in particle size of WC powder on the sintering behavior and mechanical properties were investigated.

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