A new model for thermal conductivity of “continuous matrix / dispersed and separated 3D-particles” type composite materials and its application to WC-M (M = Co, Ag) systems

Wen, Shiyi; Du, Yong; Jing, Tan; Zhou, Panyue; Long, Jianzhan; Kaptay, George

doi:10.1016/j.jmst.2021.04.036

Cited by 17 publications

(11 citation statements)

References 36 publications

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“…In order to establish the model for describing thermal conductivity of two-phase WC-Co-Ni varying with the temperature, composition and WC grain size, the thermal conductivity of WC and (Co, Ni) phases should be modeled firstly. The model for the WC hard phase is directly taken from [ 29 ] while the one for (Co, Ni) is developed via the Calphad-type model [ 28 ]. The thermal conductivity k M for the binary M (M = (Co, Ni) in the present work) binder phase can be described as [ 28 ]:

where

and

are the atomic percent of elements Co and Ni.…”

Section: Modelsmentioning

confidence: 99%

“…Equations (5)–(7) show our recently developed thermal conductivity model for two-phase composite materials [ 29 ], which has been validated for two-phase WC-Co [ 29 ], WC-Ag [ 29 ] and WC-Ni [ 30 ] systems.

where

(W/mK) represents the thermal conductivity of two-phase composite materials (i.e., WC + (Co, Ni) phases in the present work),

(W/mK) the thermal conductivity of the WC hard phase,

the volume fraction of the WC grains in the composites,

(m 2 K/W) the ITR between M and WC phases and

(m) the WC grain size.…”

Section: Modelsmentioning

confidence: 99%

“…In such cases, the thermal fatigue behavior does not tend to occur, which can critically improve the service life. To fill the gaps in knowledge on thermal conductivity for WC-based cemented carbides, we developed models for calculating thermal conductivities for single-phase solid solutions [ 28 ] and two-phase composite materials [ 29 ] in our previous work. Coupling these models, we successfully established thermal conductivity models for calculating and predicting the thermal conductivity of WC-based systems with simple binder phases, e.g., WC-Co, WC-Ag, as well as WC-Ni systems [ 29 , 30 ].…”

Section: Introductionmentioning

confidence: 99%

“…To fill the gaps in knowledge on thermal conductivity for WC-based cemented carbides, we developed models for calculating thermal conductivities for single-phase solid solutions [ 28 ] and two-phase composite materials [ 29 ] in our previous work. Coupling these models, we successfully established thermal conductivity models for calculating and predicting the thermal conductivity of WC-based systems with simple binder phases, e.g., WC-Co, WC-Ag, as well as WC-Ni systems [ 29 , 30 ]. Still, a model and an investigation into the thermal conductivity of the WC-based system with composite binder phases such as WC-Co-Ni have not ever been realized.…”

Section: Introductionmentioning

confidence: 99%

“…Subsequently, the key parameter, i.e., ITR of two-phase WC-Co-Ni is to be assessed. Substituting the obtained ITR, the thermal conductivity of (Co, Ni) the binder phase and the one of the WC hard phase into the thermal conductivity model for composites [ 29 ], the model for evaluating the thermal conductivity of the two-phase WC-Co-Ni is finally developed. Its reliability will be further validated through comparing the model-evaluated thermal conductivities with the experimental data.…”

Section: Introductionmentioning

confidence: 99%

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Investigations on Thermal Conductivity of Two-Phase WC-Co-Ni Cemented Carbides through a Novel Model and Key Experiments

Wen

Jing

Long³

et al. 2023

Materials

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Excellent thermal conductivity is beneficial for the fast heat release during service of cemented carbides. Thus, thermal conductivity is a significant property of cemented carbides, considerably affecting their service life. Still, there is a lack of systematic investigation into the thermal conductivity of two-phase WC-Co-Ni cemented carbides. To remedy this situation, we integrated experiments and models to study its thermal conductivity varying the phase composition, temperature and WC grain size. To conduct the experiments, WC-Co-Ni samples with two-phase structure were designed via the CALPHAD (Calculation of Phase Diagrams) approach and then prepared via the liquid-phase sintering process. Key thermal conductivity measurements of these prepared samples were then taken via LFA (Laser Flash Analysis). As for modeling, the thermal conductivities of (Co, Ni) binder phase and WC hard phase were firstly evaluated through our previously developed models for single-phase solid solutions. Integrating the present key measurements and models, the values of ITR (Interface Thermal Resistance) between WC hard phase and (Co, Ni) binder phase were evaluated and thus the model to calculate thermal conductivity of two-phase WC-Co-Ni was established. Meanwhile, this model was verified to be reliable through comparing the model-evaluated thermal conductivities with the experimental data. Furthermore, using this developed model, the thermal conductivity of two-phase WC-Co-Ni varying with phase-fraction, temperature and grain size of WC was predicted, which can contribute to its design for obtaining desired thermal conductivities.

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where

and

are the atomic percent of elements Co and Ni.…”

Section: Modelsmentioning

confidence: 99%