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Lab talk, the good, the bad, and the ugly
Metal
Solder Platinum Plus
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<blockquote data-quote="Presswood" data-source="post: 317035" data-attributes="member: 1971"><p>AmsterDan,</p><p>I think the heavy oxide layer on this alloy might be the problem with getting the solder to readily flow. To reduce oxidation, after fluxing, try using sticky wax to assemble your bridge with. After investment has fully set, submerge in Very hot water to peel off sticky wax. Then trim bulk from investment & place in burnout oven. Only go up just hot enough to dry completely, maybe 700-800 deg. F with no hold. Remove from oven with torch ready. Keep flame in constant contact with joint as to not allow oxygen to contact joint. I’m guessing that the higher & longer burn out times used to eliminate the duralay or pattern resin that most Techs use might be contributing to oxide formation. </p><p>That is interesting about getting good fits using 4mm less liquid, it has been recommended to me by both the alloy & one of the investment manufacturers to use 1mm Extra liquid!??</p></blockquote><p></p>
[QUOTE="Presswood, post: 317035, member: 1971"] AmsterDan, I think the heavy oxide layer on this alloy might be the problem with getting the solder to readily flow. To reduce oxidation, after fluxing, try using sticky wax to assemble your bridge with. After investment has fully set, submerge in Very hot water to peel off sticky wax. Then trim bulk from investment & place in burnout oven. Only go up just hot enough to dry completely, maybe 700-800 deg. F with no hold. Remove from oven with torch ready. Keep flame in constant contact with joint as to not allow oxygen to contact joint. I’m guessing that the higher & longer burn out times used to eliminate the duralay or pattern resin that most Techs use might be contributing to oxide formation. That is interesting about getting good fits using 4mm less liquid, it has been recommended to me by both the alloy & one of the investment manufacturers to use 1mm Extra liquid!?? [/QUOTE]
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Lab talk, the good, the bad, and the ugly
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Solder Platinum Plus
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