• Werbach, Katharina

Abstract

<jats:p>&lt;p&gt;The relationship between fracture toughness and Yttria content in modern zirconia ceramics was revised. For that purpose, we evaluated here 10 modern Y&lt;sub&gt;2&lt;/sub&gt;O&lt;sub&gt;3&lt;/sub&gt;-stabilized zirconia (YSZ) materials currently used in biomedical applications, namely prosthetic and implant dentistry. The most relevant range between 2-5 mol% Y&lt;sub&gt;2&lt;/sub&gt;O&lt;sub&gt;3&lt;/sub&gt; was addressed by selecting from conventional opaque 3 mol% YSZ up to more translucent compositions (4-5 mol% YSZs). A technical 2YSZ was used to extend the range of our evaluation. The bulk mol% Y&lt;sub&gt;2&lt;/sub&gt;O&lt;sub&gt;3&lt;/sub&gt; concentration was measured by X-Ray Fluorescence Spectroscopy. Phase quantification by Rietveld refinement are supplied by considering only two tetragonal phases or an additional improbable cubic phase. A first-account of the fracture toughness (&lt;i&gt;K&lt;/i&gt;&lt;sub&gt;Ic&lt;/sub&gt;) of the partly-sintered materials is given, which amounted to 0.4 – 0.7 MPaÖm. In the fully-densified state, an inverse power-law behavior was obtained between &lt;i&gt;K&lt;/i&gt;&lt;sub&gt;Ic&lt;/sub&gt; and bulk mol% Y&lt;sub&gt;2&lt;/sub&gt;O&lt;sub&gt;3&lt;/sub&gt; content, whether using only our measurements or including literature data, challenging some established relationships.&lt;/p&gt;</jats:p>

Topics

• impedance spectroscopy
• phase
• ceramic
• fracture toughness
• fluorescence spectroscopy
• X-ray fluorescence spectroscopy
• ion chromatography