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Lab talk, the good, the bad, and the ugly
Metal
$1900/oz Gold! The end is near!
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<blockquote data-quote="TECHARTISAN" data-source="post: 43363" data-attributes="member: 1289"><p>hmm very interesting...</p><p>dip etching with hydrofluoric, is a common method of alpha case removal industrially.....Im not sure I would agree with the characterization of its action as "severely corroding" though in untrained hands I can understand the literatures over dramatization.</p><p>I can only assume that the "bonder" must be scavenging oxygen in a reaction with the alpha casing..acting, at least as part of its function, as an etchant...otherwise allowing alpha case regeneration would make no sense at all. </p><p>The 10 minutes but not more than 30 could imply that beyond a specific time the expected amount of alpha casing would be too much for the bonding agent to react properly...leaving residual oxides trapped beneath....</p><p></p><p>In which case...the imprecision introduced by other variables....temperature, humidity, degradation of the bonding agents active ingredient....could affect the 10-30 minute window adversely...resulting in left over oxides....which would breakdown in your firing resulting in the outgassing youve described...</p><p></p><p>of course, this is all speculative...but interesting nonetheless</p></blockquote><p></p>
[QUOTE="TECHARTISAN, post: 43363, member: 1289"] hmm very interesting... dip etching with hydrofluoric, is a common method of alpha case removal industrially.....Im not sure I would agree with the characterization of its action as "severely corroding" though in untrained hands I can understand the literatures over dramatization. I can only assume that the "bonder" must be scavenging oxygen in a reaction with the alpha casing..acting, at least as part of its function, as an etchant...otherwise allowing alpha case regeneration would make no sense at all. The 10 minutes but not more than 30 could imply that beyond a specific time the expected amount of alpha casing would be too much for the bonding agent to react properly...leaving residual oxides trapped beneath.... In which case...the imprecision introduced by other variables....temperature, humidity, degradation of the bonding agents active ingredient....could affect the 10-30 minute window adversely...resulting in left over oxides....which would breakdown in your firing resulting in the outgassing youve described... of course, this is all speculative...but interesting nonetheless [/QUOTE]
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Lab talk, the good, the bad, and the ugly
Metal
$1900/oz Gold! The end is near!
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