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Lab talk, the good, the bad, and the ugly
Zirconium
How do I test Zirconia puck quality?
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<blockquote data-quote="CoolHandLuke" data-source="post: 358567" data-attributes="member: 4850"><p>the entire field of X ray crystallography would like to tell you this is incorrect.</p><p></p><p>optical translucency/transparency is derived from how closely the zirconia is to a Cubic lattice, which means the arrangement of atoms or molecules in the crystal structure must be arranged as close to cubic form as possible to acheive translucency or transparency. we did have a zirconia that claimed to be a cubic product, but after learning this much about x ray crystallography i can confidently say it was a gimmicky name and not an actual cubic state lattice arrangement.</p><p></p><p>Tetragonal zirconia is close to cubic, but not quite perfect. the atoms form a skewed polygon, so the grade of transparency will come from the angle between the molecules.</p><p></p><p>yttria is a stabilizing agent, of which only 1 percent by volume is needed to create a zirconia powder that does not ignite or be radioactive at room temperature. zirconia is otherwise unstable. yttria 3% and 5% and 8% are then used as doping agents to secure the zirconia so that shrinkage will be uniform throughout the mass.</p><p></p><p>now, how you can do your own 3 or 4 point bend test? go to a university material science lab and pay the department head a few grand or have the students perform the bend test as grad work or leveraged against course objectives.</p><p></p><p>speaking from experience.</p></blockquote><p></p>
[QUOTE="CoolHandLuke, post: 358567, member: 4850"] the entire field of X ray crystallography would like to tell you this is incorrect. optical translucency/transparency is derived from how closely the zirconia is to a Cubic lattice, which means the arrangement of atoms or molecules in the crystal structure must be arranged as close to cubic form as possible to acheive translucency or transparency. we did have a zirconia that claimed to be a cubic product, but after learning this much about x ray crystallography i can confidently say it was a gimmicky name and not an actual cubic state lattice arrangement. Tetragonal zirconia is close to cubic, but not quite perfect. the atoms form a skewed polygon, so the grade of transparency will come from the angle between the molecules. yttria is a stabilizing agent, of which only 1 percent by volume is needed to create a zirconia powder that does not ignite or be radioactive at room temperature. zirconia is otherwise unstable. yttria 3% and 5% and 8% are then used as doping agents to secure the zirconia so that shrinkage will be uniform throughout the mass. now, how you can do your own 3 or 4 point bend test? go to a university material science lab and pay the department head a few grand or have the students perform the bend test as grad work or leveraged against course objectives. speaking from experience. [/QUOTE]
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Lab talk, the good, the bad, and the ugly
Zirconium
How do I test Zirconia puck quality?
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