Transient-regime grain growth in nanocrystalline yttria-stabilized zirconia annealed without and with a DC electric field

Wang, J.; Yang, Dongmei; Conrad, H.

doi:10.1016/j.scriptamat.2013.05.001

Cited by 14 publications

(12 citation statements)

References 22 publications

(39 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…2 refers to the parameter with applied field, its absence without field. In prior work [4,5,19], it was found that the parameters A, D, and m are relatively independent of E. Rearranging Eq. 2 then gives for a constant temperature…”

Section: The Modelmentioning

confidence: 98%

Contribution of the space charge to the grain boundary energy in yttria-stabilized zirconia

Wang

Conrad

2014

J Mater Sci

View full text Add to dashboard Cite

A model based on the effect of a modest applied dc electric field on grain growth is proposed for the contribution of the space charge to the grain boundary (GB) energy in 3 mol % yttria-stabilized zirconia (3 YSZ). The model considers that the total GB energy c 0 b (the capillary driving force for grain growth) consists of three major components: (a) c R b due to the misorientation between neighboring grains, (b) c s b due to the size misfit between the segregated solute and the solvent cations, and (c) c e b the electrostatic (space charge) component, which results from the segregation of the aliovalent yttrium ions to the grain boundaries. The former two components combined comprise 40 % of the total GB energy in 3 YSZ and the electrostatic component 60 %. Based on the model, the calculated magnitudes of the three components were in qualitative accord with theoretical considerations and with values reported in the literature. A reduction in c e b ; and in turn in c 0 b ; results from the bias exerted by the applied field on the space charge potential that occurs with the segregation of the yttrium ions to the grain boundaries. The observed reduction of grain growth in 3 YSZ by an applied electric field is attributed mainly to the reduction in c e b by the field.

show abstract

Section: The Modelmentioning

confidence: 98%

Contribution of the space charge to the grain boundary energy in yttria-stabilized zirconia

Wang

Conrad

2014

J Mater Sci

View full text Add to dashboard Cite

show abstract

“…The main body of comparative grain growth studies relates to the ionic conducting systems of stabilized zirconia [112][113][114][115][116][117][118]. Densification and grain growth behaviour of porous and dense specimens were investigated under the applied AC and DC fields.…”

Section: Grain Growth Studiesmentioning

confidence: 99%

“…However, the application of 18 V cm -1 DC electric field on similar dense specimens at 1400°C resulted in faster grain growth, i.e. linear grain growth, compared to the normal grain growth (parabolic) in the absence of the field [113]. The authors referred the change in grain growth behaviour to the field effect on the solute drag mechanism in 3Y-TZP.…”

Section: Grain Growth Studiesmentioning

confidence: 99%

Grain growth during spark plasma and flash sintering of ceramic nanoparticles: a review

et al. 2017

View full text Add to dashboard Cite

Spark plasma and flash sintering process characteristics together with their corresponding sintering and densification mechanisms and field effects were briefly reviewed. The enhanced and inhibited grain growth obtained using these field-assisted densification techniques were reported for different ceramic nanoparticle systems and related to their respective densification mechanisms. When the densification is aided by plastic deformation, the kinetics of grain growth depends on the particles' rotation/sliding rate and is controlled by lattice and pipe diffusion. When the densification is aided by spark, plasma, and the particles' surface softening, grain growth kinetics is controlled by viscous diffusion and interface reactions. Grain growth in both cases is hierarchical by grain rotation, grain cluster formation and sliding, as long as the plastic deformation proceeds or as long as plasma exists. Densification by diffusion in a solid state via defects leads to normal grain growth, which takes over at the final stage of sintering. Various field effects, as well as the effect of external pressure on the grain growth behaviour were also addressed.

show abstract

“…Recently, different models for rapid field-affected sintering, densification and grain growth of ceramic oxide nanoparticles were proposed. These refer either to the formation of a high density of defects at the surfaces and grain boundaries [1][2][3] and a decrease in the grain boundary energy [4], or to enhanced diffusion through an amorphous layer at the particle surfaces due to surface discharges and possible plasma formation [5][6][7][8][9]. Experimental evidence has been provided for the breakdown of the nonconducting oxide layers at the surfaces of metallic nanoparticles subjected to low voltages, simulating the SPS conditions [9][10][11][12].…”

mentioning

confidence: 99%

Plasma in spark plasma sintering of ceramic particle compacts

et al. 2014

View full text Add to dashboard Cite

Cuboidal LiF microcrystal powder was densified by spark plasma sintering at different pressures up to 500°C. Densification at pressures above the yield stress occurred by plastic deformation and strain hardening. Densification at 2 MPa, below the yield stress, occurred by particle rearrangement assisted by viscous flow at the particle surfaces. Scanning electron microscopy examination of the fracture surfaces of the partially dense specimens revealed partial melting of the particle surfaces due to the plasma. The onset temperature for plasma formation was 180°C.

show abstract

Transient-regime grain growth in nanocrystalline yttria-stabilized zirconia annealed without and with a DC electric field

Cited by 14 publications

References 22 publications

Contribution of the space charge to the grain boundary energy in yttria-stabilized zirconia

Contribution of the space charge to the grain boundary energy in yttria-stabilized zirconia

Grain growth during spark plasma and flash sintering of ceramic nanoparticles: a review

Plasma in spark plasma sintering of ceramic particle compacts

Contact Info

Product

Resources

About