Growth of Carbide Particles in TiC&amp;ndash;Ni and TiC&amp;ndash;Mo&lt;SUB&gt;2&lt;/SUB&gt;C&amp;ndash;Ni Cermets during Liquid Phase Sintering

Matsubara, Hideaki; Shin, Soon Gi; Sakuma, Taketo

doi:10.2320/matertrans1989.32.951

Cited by 18 publications

(12 citation statements)

References 21 publications

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“…4 and 7 support neither of these mechanisms of Ostwald ripening for grain growth in the carbides. Based on these results, we propose that the movement of solid/liquid interfaces during grain growth is restricted by the existence of solid/solid boundaries [27,28]. Therefore, it is necessary to develop a theoretical or simulation technique to explain the grain growth mechanism in systems in which solid/liquid interfaces and solid/solid boundaries coexist.…”

Section: Grain Growth Of Carbide Particlesmentioning

confidence: 99%

RETRACTED ARTICLE: Experimental and simulation studies on grain growth in TiC and WC-based cermets during liquid phase sintering

Shin

2000

Metals and Materials

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The grain growth behaviors of TiC and WC particles in TiC-Ni, TiC-Mo2C-Ni, WC-Co and WC-VC-Co alloys during liquid phase sintering were investigated for different Ni or Co contents and compared with the results of Monte Carlo simulations. In the experimental study, TiC-Ni and WC-Co alloys had a maximum grain size at a certain liquid volume fraction, while the grain size in TiC-Mo2C-Ni and WC-VC-Co alloys increased monotonically with an increasing liquid volume fraction. These results mean that the grain growth of these alloys cannot be explained by the conventional mechanisms for Ostwald ripening, namely diffusion or reaction controlled processes. Monte Carlo simulations with different energy relationships between solidliquid interfaces predicted the effect of the liquid volume fraction on grain size similar to the experimental results. The contiguous boundaries between solid (carbide) particles appear to influence the grain growth behavior in TiC-and WC-based alloys during liquid phase sintering.Keywords : cemented carbides, cermets, tungsten carbide, titanium carbide, grain growth, simulation, Monte Carlo method, liquid phase sintering, Ostwald ripening ~TRODUCTIONIt is well known that many systems in ceramics and cermets can be densified by liquid phase sintering [1,2] and the mechanical properties of these materials are strongly affected by the microstmcture, especially the grain size. It is therefore very important to understand the grain growth behavior and its mechanism in order to produce high-performance materials. The grain growth of a solid phase in a liquid phase via a solution-reprecipitation process is called Ostwald ripening, and has often been studied from a theoretical viewpoint [3][4][5].TiC-and WC-based cermets that are widely used as cutting tool materials are fabricated by liquid phase sintering. Grain growth of the carbide particles in these cermets during the sintering occurs by mass transport through a liquid phase. In previous studies on the grain growth of these cermets [6][7][8], an Ostwald ripening mechanism controlled either by diffusion or by a reaction process has often been proposed to explain the grain growth behavior. However, the grain growth mechanism in these cermets is not yet understood in detail yet, especially the effect of the liquid phase content. The classical theory of Ostwald ripening is not sufficient to explain the grain growth mechanism of these cermets, particularly when considering the small amount of liquid used to sinter materials for real applications.The present study examines the grain growth behavior in the presence of a liquid phase for TiC-Ni, WC-Co, TiCMo:C-Ni and WC-VC-Co alloys by varying the liquid phase content over a wide range. In addition to experiments, computer simulation using the Monte Carlo method was performed to examine grain growth in the presence of a liquid phase. Monte Carlo simulation of grain growth [9][10][11][12] is very useful for understanding the grain growth in complicated systems in which solid/liquid interfaces and solid/solid...

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Section: Grain Growth Of Carbide Particlesmentioning

confidence: 99%

RETRACTED ARTICLE: Experimental and simulation studies on grain growth in TiC and WC-based cermets during liquid phase sintering

Shin

2000

Metals and Materials

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“…This shell formation creates more carbonitride grains with smaller Ti(C,N) cores, and limits further growth under conventional sintering conditions [22,23]. However, it has also been suggested that Mo 2 C acts as a grain refiner because of the retarding effect it has on the solid/solid boundary mobility of the Ti(C,N) grains, which is a common effect seen in ceramics [24]. The carbonitride grain size determines an important characteristic in the cermet system.…”

Section: Densification Behaviour and Microstructure Developmentmentioning

confidence: 99%

The effects of Mo2C additions on the microstructure and sliding wear of TiC0.3N0.7–Ni3Al cermets

Stewart

Plucknett

2015

International Journal of Refractory Metals and Hard Materials

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“…In contrast, the dispersion of TiC particles was improved by Ni plating and produced a more uniform microstructure. The shape of the TiC particles became more prismatic after sintering, a feature characteristic of TiC-Ni cermets and a result of solutionreprecipitation during liquid-phase sintering [3].…”

Section: Density and Microstructurementioning

confidence: 99%

“…It is known that TiC-Ni cermets are densified by liquid-phase sintering [3,4]. According to the phase diagram [5], the liquid phase appears at 1543 K with 70 vol.% Ni and at 1558 K with 30 vol.% Ni; therefore, the specimens were sintered above these temperatures.…”

Section: Sintering Behavior Of Tic-ni Cermetsmentioning

confidence: 99%

Preparation and properties of TiC-Ni cermets using Ni-plated TiC

Shin

2002

Met. Mater. Int.

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TiC powders were coated with Ni by a chemical plating technique and the pressed compacts sintered at 1623K. The density of the sintered bodies was 98-99%. Compared with mechanically-mixed powder, Niplated TiC powders gave a more uniform microstructure in which TiC particles were well dispersed in the Ni matrix. The cermets exhibited ductile fracture for TiC-70 vol.% Ni and brittle fracture for TiC-30 vol.% Ni. The flexural strength was improved by the homogeneous dispersion of TiC. The thermal expansion coefficient increased with a decrease in Ni content, following a nearly linear law of mixtures on the basis of volume fractions of pure TiC and Ni.

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Growth of Carbide Particles in TiC–Ni and TiC–Mo<SUB>2</SUB>C–Ni Cermets during Liquid Phase Sintering

Cited by 18 publications

References 21 publications

RETRACTED ARTICLE: Experimental and simulation studies on grain growth in TiC and WC-based cermets during liquid phase sintering

RETRACTED ARTICLE: Experimental and simulation studies on grain growth in TiC and WC-based cermets during liquid phase sintering

The effects of Mo2C additions on the microstructure and sliding wear of TiC0.3N0.7–Ni3Al cermets

Preparation and properties of TiC-Ni cermets using Ni-plated TiC

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