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Fixed
Bubbles after second firing or glaze baking using NP metal
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<blockquote data-quote="martintay" data-source="post: 110333" data-attributes="member: 7949"><p>It sounds like the opaque is not bonding - did the bridge fracture right down to the metal ? Check burn-out furnace is venting ok !As i`ve said EX3 opaque does not like NP as a base coat !! The bond too NP is probably higher than Noble or SP, also the alloy in thin sections does not deflect as easily thus reducing the risk of fracture.Np frames are finished with new diamonds then i sand-blast 50um @ 4 bar - ultrasonic in water 2mins - dry in furnace 400`C . Gc In MB and EX 3(for the second coat) is the same fireing cycle - </p><p></p><p>Dry @ 400`C for 6 mins</p><p>Heat rate 60`C/min</p><p>Vac on @ 450</p><p>High Temp 980 </p><p>Vac off 979</p><p>1 minute hold time in air.</p><p></p><p>No need to pre oxidize NP in fact don`t !</p><p>When opaqued ultrasonic in water for 1 minute to wash off "free oxide" which will send your porcelain greenish as soon as the moist build-up comes into contact with it.</p><p>Be carefull not to "pool" the opaque !</p><p>If its a large frame increase Dry Time to 8 minutes to be on the safe side <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /></p></blockquote><p></p>
[QUOTE="martintay, post: 110333, member: 7949"] It sounds like the opaque is not bonding - did the bridge fracture right down to the metal ? Check burn-out furnace is venting ok !As i`ve said EX3 opaque does not like NP as a base coat !! The bond too NP is probably higher than Noble or SP, also the alloy in thin sections does not deflect as easily thus reducing the risk of fracture.Np frames are finished with new diamonds then i sand-blast 50um @ 4 bar - ultrasonic in water 2mins - dry in furnace 400`C . Gc In MB and EX 3(for the second coat) is the same fireing cycle - Dry @ 400`C for 6 mins Heat rate 60`C/min Vac on @ 450 High Temp 980 Vac off 979 1 minute hold time in air. No need to pre oxidize NP in fact don`t ! When opaqued ultrasonic in water for 1 minute to wash off "free oxide" which will send your porcelain greenish as soon as the moist build-up comes into contact with it. Be carefull not to "pool" the opaque ! If its a large frame increase Dry Time to 8 minutes to be on the safe side :) [/QUOTE]
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Fixed
Bubbles after second firing or glaze baking using NP metal
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