Microwave Sintering of Niobium Co-doped Yttria Stabilized Zirconia

Abstract

<p class="MsoNormal" style="margin: 0cm 0cm 4pt; line-height: 12pt; mso-line-height-rule: exactly; mso-pagination: widow-orphan;"><span style="font-size: 10pt; mso-font-kerning: 0pt; mso-fareast-language: EN-US;" lang="EN-US"><span style="font-family: Times New Roman;">Y₂O₃ and Nb₂O₅ doped tetragonal zirconia polycrystals were sintered at 1550ºC by conventional and microwave sintering. The effect of co-doping yttria stabilized tetragonal zirconia polycrystal with Nb₂O₅ was analyzed. The micro structural changes due to conventional and microwave sintering was studied using SEM and it was found that microwave sintering resulted in uniform microstructure with small grains. The phases were analyzed using X-ray diffraction analysis.</span></span></p

Physical and mechanical properties of Ta2O5 doped zirconia-toughened alumina (ZTA) composites

“…The increase in the tetragonality due to doping is consistent with the increase in the fracture toughness [9][10][11].…”

“…Addition of pentavalent cations to Y-TZP reduces the stability of the higher-temperature polymorphs (cubic and tetragonal) against distortion. Since oxygen vacancies are effective in stabilizing both the cubic and tetragonal structures, the destabilizing effect of Ta 5+ doping can be attributed to the decreased concentration of oxygen vacancies [8,9]. The decrease of oxygen vacancies has the effect of increasing the tetragonality.…”

Synthesis and Characterization of Stabilized Zirconia Toughened Alumina (ZTA) Doped Niobium Pentoxide (Nb2O5)

“…4 (b), (c) and (d), the microstructure of doped ZTA samples distribution shows the same allocation as the undoped ZTA sample even with presence of niobium pentoxide particles. This is because the addition of Nb 2 O 5 does not change the microstructure that is only up to 6 wt% niobium pentoxide addition [12,13]. Lesser porosity with good particle distribution and sizes shown by ZTA0.5 and ZTA0.7 compared to pure ZTA sample and 0.3 wt% Nb 2 O 5 dopant.…”

“…Researchers have studied that the densification and mechanical properties of samples can be enhanced by the addition of Nb 2 O 5 [6,12]. The enhancement of ceramics composite material can be accomplished by using different type of manipulated dopant contents to improve their mechanical properties such as hardness and fracture toughness that prompted to various applications.…”

Fabrication and characterization of Nb2O5‐doped 3Y‐TZP materials sintered by microwave technology

“…The fracture toughness increased from 5.2 to 6.2 MPa·m 1/2 with the addition of .6 vol.% of Nb 2 O 5 . Vidyavathy and Kamaraj studied the microwave sintering of 3Y‐TZP/Nb 2 O 5 in which phase transformation analysis and structural analysis were made to determine changes in the material 16 . In their study, they used a multimode microwave equipment and concluded that combination of transformation toughening and ductile particle reinforcements improved substantially the crack growth resistance and flaw tolerance.…”