Y2O3–Nd2O3 double stabilized ZrO2–TiCN nanocomposites

Salehi, Sedigheh; Yüksel, Berat; Vanmeensel, Kim; Biest, Omer Van der; Zhang, Fei

doi:10.1016/j.matchemphys.2008.08.014

Cited by 6 publications

(2 citation statements)

References 24 publications

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“…Recent developments in zirconia composites are focused not only on the improvement of toughness, strength and hardness, but also on the possibility for mass production and manufacturing cost reduction. A successful approach is to incorporate electrically conductive reinforcements such as TiB 2 [15,16], TiN [17], WC [14,[18][19][20][21][22], TiC [23] or TiCN [24] into the zirconia matrix. The incorporation of ≥ 35 vol % of these conductive reinforcements makes the composite electrically conductive enough to be machinable by electrical discharge machining.…”

Section: Pulsed Electric Current Sinteringmentioning

confidence: 99%

Pulsed Electric Current Sintering of Electrical Discharge Machinable Ceramics

Zhang

Malek

Vanmeensel

et al. 2010

Advances in Science and Technology

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Pulsed electric current sintering allows densifying most ceramics at high heating and cooling rates within very short times at elevated temperature, allowing to minimise grain growth. In order to fully explore the PECS potential, it is beneficial to flow the current through the powder compact by either using conductive powder or a powder compact that becomes conductive during densification. Although in-situ Joule heating of the powder compact allows very fast heating rates, it does not necessarily result in a homogeneous temperature distribution. The influence of the current flow on densification and the impact of electrical conductivity on the temperature distribution during PECS are illustrated. The PECS technology at present is limited to the fabrication of simple geometrical shapes. Electrical Discharge Machining (EDM) on the contrary allows production of complex shapes, providing the ceramic has a minimum electrical conductivity. Although EDM has no mechanical impact, the thermal impact is high and the EDM parameters should be carefully selected in order to optimise surface quality and component strength. During wire-EDM, the fast and rough initial cut has to be followed by a sequence of lower energy finishing cuts to optimise the surface quality. The case studies presented are B4C-TiB2 ceramics and ZrO2-based composites with electrically conductive phase addition.

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Section: Pulsed Electric Current Sinteringmentioning

confidence: 99%

Pulsed Electric Current Sintering of Electrical Discharge Machinable Ceramics

Zhang

Malek

Vanmeensel

et al. 2010

Advances in Science and Technology

View full text Add to dashboard Cite

show abstract

“…The metastable tetragonal phase changes into the monoclinic phase with increasing temperature, and this transformation prevents applications of tetragonal ZrO 2 over a broad temperature range [5]. Many researchers have studied the mechanism of the phase transition of ZrO 2 [4,6] and the method for stabilization of the tetragonal phase, usually by alloying ZrO 2 with some oxides, such as CaO, MgO, and SiO 2 [7][8][9].…”

Section: Introductionmentioning

confidence: 99%