http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Al-Amin Md.,Mumu Homayra Tabassum,Sarker Saugata,Alam Md. Zahangir,Gafur M. A. 한국세라믹학회 2023 한국세라믹학회지 Vol.60 No.1
The effects of sintering temperature and ZrO2 addition on the hardness and fracture toughness of zirconia toughened alumina (ZTA)–MgO–TiO2 composite was investigated. 5 wt.% CeO2 was added to ZTA containing 5 wt.% of MgO and 5 wt.% of TiO2. Two sets of composition A5ZMTC and A15ZMTC were used consisting of 5 wt.% and 15 wt.% of 3YSZ, respectively, to analyze the effect of CeO2 on the base composition. The powders were pressed into pellets and sintered at different temperatures of 1450 °C, 1500 °C, 1600 °C and 1650 °C for 3 h. Density, hardness and fracture toughness increased to a maximum value and then decreased. From the XRD analysis, Ce0.7Zr0.3O2 in only A5ZMTC and CeAl11O18 in only A15ZMTC are evident. The highest fracture toughness of 12.03 MPam1/2 (Casellas) was achieved at 1500 °C in A15ZMTC and maximum hardness of 14.15 GPa was obtained in A5ZMTC sintered at 1450 °C.
Dhar Sajib Aninda,Sarker Saugata,Mumu Homayra Tabassum,Rashid A. K. M. Bazlur 한국세라믹학회 2023 한국세라믹학회지 Vol.60 No.2
The effects of varying amount of nano-3 mol% yttria-stabilized zirconia addition on the crystal structures, mechanical, and microstructural properties of zirconia-toughened alumina (ZTA) composite have been investigated in this work. The ZTA specimens were prepared by different 3Y-TZP amount ranging from 9 to 18 wt.% and sintered at 1550 °C for 2 h. The densification behaviour, indentation fracture toughness, microhardness, elastic modulus, flexural strength and surface morphology of the composites have been determined and correlated with tetragonal → monoclinic phase transformation and retention of tetragonal phase. Rietveld refinement of the crystallographic data was performed to correlate the effect of zirconia addition on the phase compositions, t → m transformability and impacts on crystallite sizes and lattice parameter. The toughness and flexural strength of the composites improved significantly up to 15 wt.% YSZ addition followed by a reduction for 18 wt.%, while the hardness and elastic modulus decreased with YSZ addition. Rietveld refinement ascertains the metastable t-ZrO2 retention and thermodynamically stable m-ZrO2 transformation with increasing 3Y-TZP and subsequent enhancement in fracture toughness through transformation toughening.