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Lab talk, the good, the bad, and the ugly
Porcelain
Noritake EX3 firing parameters
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<blockquote data-quote="adamb4321" data-source="post: 129368" data-attributes="member: 838"><p>Non precious is normally ok for us and we use the Bredent paste as the first coat on NP (I still get bubbles if I use it on precious) but the big problem is precious metal (argipal) I've had one today bubbles around the cervical (over porc butt fit) and down the distal contact area. spherical voids, trimmed them out and they didn't go through to the opaque, did a correction in the glaze bubbles gone but now the ceramics cracked. So, I'm thinking the opaque has bubbled/debonded so I trim off all the ceramic and opaque to find no bubbling at all and the opaque is still bonded to the metal surface.</p><p></p><p>Trimming is done with tungstens, NP I tend to smooth over with a blue stone, precious are also trimmed with tungstens and then smoothed over with a brow stone, all blasted with ALOX 120micron at 2 bar and then steam cleaned.</p><p></p><p>I've just replaced the crucible etc I'll double check the gas settings but I don't think anything has changed there.</p><p></p><p>We give the units a thin coat of bredent and the precious a thin coat of duceram kiss (the noritake opaque seems to cause loads of issues when used as the first coat).</p><p></p><p>And just to add insult to injury my colleague with 2yrs experience isn't getting this issue (she mainly builds up on the np units) I fired my work with hers today, her units all ok, mine were bubbly bullpoop.</p><p></p><p>If I use the cercon kiss on zr I have no issues at all, I've never seen a problem like this with no obvious cause and I cant think of anything that I'm doing that would promote bubbles.</p><p></p><p>it's a real pain, i'm going to get my colleague to re build the one that bubbled, so if it does it to her</p></blockquote><p></p>
[QUOTE="adamb4321, post: 129368, member: 838"] Non precious is normally ok for us and we use the Bredent paste as the first coat on NP (I still get bubbles if I use it on precious) but the big problem is precious metal (argipal) I've had one today bubbles around the cervical (over porc butt fit) and down the distal contact area. spherical voids, trimmed them out and they didn't go through to the opaque, did a correction in the glaze bubbles gone but now the ceramics cracked. So, I'm thinking the opaque has bubbled/debonded so I trim off all the ceramic and opaque to find no bubbling at all and the opaque is still bonded to the metal surface. Trimming is done with tungstens, NP I tend to smooth over with a blue stone, precious are also trimmed with tungstens and then smoothed over with a brow stone, all blasted with ALOX 120micron at 2 bar and then steam cleaned. I've just replaced the crucible etc I'll double check the gas settings but I don't think anything has changed there. We give the units a thin coat of bredent and the precious a thin coat of duceram kiss (the noritake opaque seems to cause loads of issues when used as the first coat). And just to add insult to injury my colleague with 2yrs experience isn't getting this issue (she mainly builds up on the np units) I fired my work with hers today, her units all ok, mine were bubbly bullpoop. If I use the cercon kiss on zr I have no issues at all, I've never seen a problem like this with no obvious cause and I cant think of anything that I'm doing that would promote bubbles. it's a real pain, i'm going to get my colleague to re build the one that bubbled, so if it does it to her [/QUOTE]
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Lab talk, the good, the bad, and the ugly
Porcelain
Noritake EX3 firing parameters
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