Flash Sinterlemenin PMN-PT Seramikleri Üzerine Etkisi

PMN-PT seramik tozların yoğunlaşması çalışması elektrik alan/flash sinterleme metoduyla uygulanmıştır. PMN-PT malzeme sisteminde seçilen kompozisyon 0.67[Pb(Mg1/3Nb2/3)O3]−0.33(PbTiO3) olarak belirlenmiştir. Flash sinterleme deneyi sırasında numune üzerine 200 V/mm elektrik alan 0.1 amper akım kesme değeri ile uygulanmıştır. Flash sinterleme 90 saniyeden daha az bir sürede ve yaklaşık 700 °C tamamlanmıştır. Göreceli yoğunluk değeri yaklaşık 94 % olarak ölçülmüştür ve bu değer literatürdeki değerlere göre makul bir değerdir. SEM mikroyapı örneklemesi uygun katılaşma morfolojisi göstermekte ve göreceli yoğunluk ölçümüyle uyuşmaktadır. XRD analizine göre, bahsedilen malzeme sistemi romboedrik perovskit kristal yapısında devamlılık göstermiştir ve kimyasal ve fiziksel kompozisyonunu bütün deney süresince korumuştur. Elektrik alan yardımlı/flash sinterleme tekniği ile sinterleme sıcaklığı 1200 °C den 700 °C ve sinterleme süresini 2 saatten 90 saniyeye düşürmüştür. PMN-PT açık literatüre göre flash sinterleme metoduyla ilk defa üretilmiştir. Böylelikle bu yoğunlaşma metodu yüksek sıcaklık proseslerde ortaya çıkan toksik Pb salınımı azaltmasıyla önem kazanacaktır.

Anahtar Kelimeler:

PMN-PT, flash sinterleme, Piezoelektrik seramikler, Elektrik alan, ferroelektrik

Flash Sintering Effect on PMN-PT Ceramics

Densification of PMN-PT piezoelectric ceramic powder is carried out by electric field assisted/flash sintering method. The composition selected in PMN-PT materials system is 0.67[Pb(Mg1/3Nb2/3)O3]−0.33(PbTiO3). During flash sintering experiment, 200 V/mm electric field is applied on sample with 0.1 amp current cutoff value. Flash sintering is accomplished in less than 90 sec at ~700 °C. Relative density for sintered sample is measured approximately 94 % which is reasonable value comparing with literature. SEM microstructure illustration exhibits proper consolidation morphology which is agreement with the relative density measurement. According to XRD analysis, the said materials system shows consistency in rhombohedral perovskite crystal structure and preserve its chemical and physical composition during whole experimental cycle. By electric field assisted/flash sintering technique, the sintering temperature is decreased from 1200 °C to 700 °C along with a decrement in sintering time from 2 hours to 90 seconds. PMN-PT is properly produced by flash sintering method for the first time with respect to open literature. Hence, this densification method will gain importance to reduce toxic Pb emission aroused at high temperature processes.

Keywords:

PMN-PT, Flash sintering, Piezoelectric ceramics, Electric field, ferroelectric,

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