Phenomenological analysis of densification kinetics during sintering: application to WC–Co mixture

Gillia, O.; Bouvard, D.

doi:10.1016/s0921-5093(99)00621-8

Cited by 63 publications

(40 citation statements)

References 20 publications

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“…Zhang (2000) Kiani (2007) Jinka Lewis(1994) u-p Gillia Bouvard (2000) WC- CO Hsueh (1986) Favrot (1997 Stairway Thermal Cycle STC Gillia (2001) WC-CO Arrhenius Kim (2003) STC Largiller (2011Largiller ( , 2012aLargiller ( , 2012b Gillia (2000,2001) Gillia Bouvard(2000) Matsubara, Saitou, Oide, Shin, Umeda, Katsuda, Mihara, Kobayashi and Terada, Transactions of the JSME (in Japanese), Vol.82, No.843 (2016) Newton Poisson…”

Section: Sovs Gasikmentioning

confidence: 99%

Constitutive equations of earthenware material during firing processes and determination of their function forms

Matsubara

Saitou²,

Oide

et al. 2016

Transactions of the JSME (In Japanese)

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We propose a set of constitutive equations of earthenware material subjected to the firing process and appropriate ways of determining their function forms and relevant material parameters from a series of respective experiments. The firing process under a specific heat curves is generally divided into three different phases; "thermal dilatation phase", "sintering phase" and "thermal contraction phase". These non-mechanical deformations are assumed not to be coincident, and the mechanical ones are assumed to be represented by viscoplastic constitutive model. Then, the key issue must be how to determine sintering strains by calibrating the employed function form of the densification rate with the data obtained from the stairway thermal cycle (STC) tests. Also, the presentations of the dependencies of the elastic and creep properties on both temperature and density are of particular importance to accurately predict the overall deformation of earthware.All the relevant material parameters as well as coefficients of thermal expansion and contraction are identified with the data obtained from respective mechanical experiments conducted in testing equipments for thermo-mechanical analysis (TMA) under several levels of termperature. The method of differential evolution, which is one of the metaheuristic optimization techniques, is employed to identify the creep parameters, since the mechanical responses to several levels of loading during firing processes involve all the non-mechanical and mechanical deformation of specimens simultaneously.The calculation results with the proposed constitutive equations are compared with the original experimental data to demonstrate the applicability for practical use of their function forms determined by the proposed strategy.

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Section: Sovs Gasikmentioning

confidence: 99%

Constitutive equations of earthenware material during firing processes and determination of their function forms

Matsubara

Saitou²,

Oide

et al. 2016

Transactions of the JSME (In Japanese)

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“…We chose to implement a phenomenological model of the type proposed by Gillia and coworkers [26,27] for free (pressure less) sintering and further developed to use for sintering under the application of external load [28]. In this model, the constitutive equations governing the sintering kinetics are given by:…”

Section: Coupled Thermal-displacement (Sintering) Detailsmentioning

confidence: 99%

Fully coupled thermal–electric-sintering simulation of electric field assisted sintering of net-shape compacts

McWilliams

Zavaliangos

2014

J Mater Sci

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A fully coupled thermal-electric-sintering finite element model was developed and implemented to predict heterogeneous densification in net-shape compacts using electric field assisted sintering techniques (FAST). FAST is a single-step processing operation for producing bulk materials from powders, in which the powder is heated by the application of electric current under pressure. Previous modeling efforts on FAST have mostly considered the thermal-electric aspect of the problem and have largely neglected the sintering aspect of the problem. A new model was developed by integrating a phenomenological sintering model into a previously established thermal-electric finite element framework to predict the densification kinetics of the sample. The model was used to quantify the effect of specimen geometry on the evolution of thermoelectric gradients and resulting heterogeneous sintering kinetics during FAST processing of a conductive powder. It is shown that the new model which considers sintering kinetics and density-dependent properties provides a substantial increase in accuracy compared to thermal-electric only models. It is also shown that small changes in local resistance due to densification can greatly impact the distribution of thermoelectric gradients during the process, which are exacerbated by heterogeneous stress states induced by sample geometry. Experimental characterization of sintered specimens is used to provide qualitative validation of the model predictions.

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“…The sintering models being developed can be classified as phenomenological approach first developed by [21][22][23][24]. This work is unique because the sintering models influenced by various powder characteristics have been studied.…”

Section: Sintering Of Ceramic Powdermentioning

confidence: 99%

“…This machine has the rod in contact with the sample to measure the change in dimension under various temperature cycles. The total testing range of this TMA machine is ±2000um, and even considering the reaction between rod and sample, the error for displacement test is claimed to be less 4% [22]. During our experiments, 5g force is applied to insure the contact between rod and sample.…”

Section: Sintering Of Ceramic Powdermentioning

confidence: 99%

Development of Powder Processing Models and Techniques for Meso-scale Devices: Perspirable Skin

Kwon¹

2008

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Public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching data sources, gathering and maintaining the data needed, and completing and reviewing the collection of information. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestions for reducing this burden to Washington Headquarters Service. Directorate for Information Operations and Reports, 1215 Jefferson Davis Highway. Suite 1204, Arlington. VA 22202-4302. and SPONSORING/MONITORING AGENCY NAME(S) AND ADDRE SS(ES)USAF/AFRL AFOSR 875 North Randolph Street Arlington VA 22203 SPONSOR/MONITOR'S ACRONYM(S) AFOSR SPONSORING/MONITORING AFRL-OSR-VA-TR-2013-0913 DISTRIBUTION AVAILABILITY STATEMENTDistribution Statement A: Approved for public release. Distribution is unlimited.- SUPPLEMENTARY NOTES ABSTRACTThe Air Force will require aerospace vehicles and weapon systems with performance superior to those of any potential adversary. The establishment of a new class of thermal management materials, such as microtextured or functionally-gradient ceramic materials, will be a key requirement for the improvement of structural performance and reliability of Air Force systems. SUBJECT TERMS EXTENTED ABSTRACTPerspirable Skin is a new concept for Autonomous Self-cooling Multi-functional Material for Reenetry or Supersonic vehicle. The basic configuration of the perspirable skin has a peg-and-hole arrangement of two materials with distinct coefficient of thermal expansion (CTEs) that has been shrink fitted. The interference between peg and hole is designed to open when the surface temperature is high. In the application with the Reentry or Supersonic vehicle, atmospheric air bombards the surface of a vehicle causing high frictional heat flux. The interference designed to be opened at a designed high temperature, which allows compressed air to be expelled through the interference between two materials. Thus, instead of the frictional heating, the compressed air, as extracted out of the interference, is mixed with the atmospheric air, intending to eliminate most of the frictional heating. The self-regulating cooling characteristic is completely reversible as the interface will close when the surface is cooled.The design and fabrication of various materials being considered including the materials with negative CTE and a designed gradiency has been completed for the construction of Perspirable Skin. For example, the materials for the core has been designed and fabricated. For example, a composite material with a desirable CTE by combining the negative and positive CTE materials and continuous Functionally Graded Materials (FGMs) by the reaction and diffusion between two materials. We have considered two types of Perspirable skin; one with mullite core and zirconia skin and the other with zirconium tungstate (ZrW 2 0 8 )-based FGM core and Reinforced Carbon-Carbon Composite (RCC) skin. The former uses the differenc...

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Phenomenological analysis of densification kinetics during sintering: application to WC–Co mixture

Cited by 63 publications

References 20 publications

Constitutive equations of earthenware material during firing processes and determination of their function forms

Constitutive equations of earthenware material during firing processes and determination of their function forms

Fully coupled thermal–electric-sintering simulation of electric field assisted sintering of net-shape compacts

Development of Powder Processing Models and Techniques for Meso-scale Devices: Perspirable Skin

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