Kinetics of the Initial Stage of Sintering from Shrinkage Data: Simultaneous Determination of Activation Energy and Kinetic Model from a Single Nonisothermal Experiment

Pérez‐Maqueda, Luis A.; Criado, J. M.; Real, C.

doi:10.1111/j.1151-2916.2002.tb00169.x

Cited by 51 publications

(22 citation statements)

References 37 publications

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“…In the initial linear step, Q is 20-85 kJ/mole; afterwards, in the parabolic step, Q increases to 85-220 kJ/mole and then slightly decreases in the final linear step. These values are in good agreement with those gained for the activation energy of the densification process for TiO 2 during the initial stage of sintering, corresponding to the plastic flow mechanism in the kinetics of sintering [31]. It is also significant that the highest absolute values for Q are in excellent agreement with those for the oxygen lattice diffusion coefficient, calculated from TGA data for the oxidation of Ti metal [24].…”

Section: Resultssupporting

confidence: 77%

“Ridge effect” in oxidation kinetics of hetero-modulus ceramics based on titanium carbide

Shabalin

2008

Powder Metall Met Ceram

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Recent studies on oxidation kinetics of the TiC-7 vol.% C (graphite) hetero-modulus ceramics at temperatures of 400-1000°C and oxygen pressures of 0.13-65 kPa have led to the discovery of a temperature-pressure-dependent phenomenon called "ridge effect". The oxidation rate of the composite rises rapidly to a maximum at ridge values of oxygen pressure (p O 2 ) or temperature (T), but then it declines with subsequent growth of oxidation parameters. The ridge values mark a change in the prevailing mechanism, as while the ridge parameter traversing the values of apparent activation energy Q or order of reaction m change its sign. The oxidation mechanisms, essentially different within the ranges of parameters, are identified according to the developed ridge-effect model, which can be applied probably to a variety of systems with inorganic compounds.

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Section: Resultssupporting

confidence: 77%

“Ridge effect” in oxidation kinetics of hetero-modulus ceramics based on titanium carbide

Shabalin

2008

Powder Metall Met Ceram

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“…The porosity decreases with increasing sintering temperature with an activation energy of 20.42 kJ/mol. This value is much lower than those reported in the existing literatures for either grain boundary diffusion (45-92 kJ/mol), lattice diffusion (130-171 kJ/mol) or plastic flow (78±3 kJ/mol) of silver [20][21][22][23]. It is closer to but still lower than the activation energy value for the self-diffusivity of silver in its liquid state (32 kJ/mol) [24].…”

Section: Effect Of Sintering Temperaturementioning

confidence: 51%

Time-Efficient Sintering Processes to Attach Power Devices Using Nanosilver Dry Film

Dai¹,

Li²,

Agyakwa³

et al. 2017

Journal of Microelectronics and Electronic Packaging

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(2017) Time-efficient sintering processes to attach power devices using nanosilver dry film. Journal of Microelectronics and Electronic Packaging, 14 (4 A note on versions:The version presented here may differ from the published version or from the version of record. If you wish to cite this item you are advised to consult the publisher's version. Please see the repository url above for details on accessing the published version and note that access may require a subscription.For more information, please contact eprints@nottingham.ac.uk Abstract: Pressure-assisted sintering processes to attach power devices using wet nanosilver pastes with time scales of minutes to a few hours have been widely reported. This paper presents our work on time-efficient sintering, using nanosilver dry film and an automatic die pick and place machine, resulting in process times of just a few seconds. The combined parameters of sintering temperature 250 C, sintering pressure 10 MPa and sintering time 5 s were selected as the benchmark process to attach 2 mm × 2 mm × 0.5 mm dummy Si devices. Then the effects of either the sintering temperature (240 to 300 C), time (1 to 9 s) or pressure (6 to 25 MPa) on the porosity and shear strength of the sintered joints were investigated with 3 groups and a total of 13 experimental trials. The average porosities of 24.6 to 46.2% and shear strengths of 26.1 to 46.6 MPa are comparable with and/or even better than those reported for sintered joints using wet nanosilver pastes. Their dependences on the sintering temperature, time and pressure are further fitted to equations similar to those describing the kinetics of sintering processes of powder compacts. The equations obtained can be used to not only reveal different mechanisms dominating the densification and bonding strength, but also anticipate the thermal-induced evolutions of microstructures of these rapidly sintered joints during future reliability tests and/or in service.

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“…The temperature ranges of initial sintering were carefully determined by collecting the data within 3% of shrinkage for each sample. [22][23][24] Densification of Tape I starts at a higher temperature (∼720 • C) when compared to Tape II (∼690 • C) or Tape III (∼670 • C). In addition, the densification of Tape I appeared to be more sluggish as the dimensional change happens over a broader temperature range of 720-885 • C. Densifications of Tape II and III occur more rapidly within a relatively short temperature range of 690-770 • C for Tape II and 670-755 • C for Tape III.…”

Section: Resultsmentioning

confidence: 99%

Shrinkage behavior of LTCC hetero-laminates

Lim

Cho

Seo

et al. 2009

Journal of the European Ceramic Society

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Kinetics of the Initial Stage of Sintering from Shrinkage Data: Simultaneous Determination of Activation Energy and Kinetic Model from a Single Nonisothermal Experiment

Cited by 51 publications

References 37 publications

“Ridge effect” in oxidation kinetics of hetero-modulus ceramics based on titanium carbide

“Ridge effect” in oxidation kinetics of hetero-modulus ceramics based on titanium carbide

Time-Efficient Sintering Processes to Attach Power Devices Using Nanosilver Dry Film

Shrinkage behavior of LTCC hetero-laminates

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