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Lab talk, the good, the bad, and the ugly
Metal
Non Precious Casting Trouble- Help!!!
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<blockquote data-quote="sidesh0wb0b" data-source="post: 135418" data-attributes="member: 7594"><p>yeah opposite side of the pond, US here.</p><p>let us know how you do, though your torch is fine. the melting range for dSign 30 is 1145C-1165C....casting temp being 1240-1350C. Ivoclar said to use a flux? thats strange, though it shouldnt hurt anything. but i dont think you should need it.</p><p></p><p>first advice.....agreed with Bumfrey....preheating the crucible and metal will help (but have your torch ready when you pull it out of the furnace, you dont want an oxide layer forming). also be sure you are using the proper multi-orifice torch tip.</p><p>2nd, your oxygen doesnt need to be much more than 2x your LP setting. i have never cast dSign 30, but its not far from other type 5 alloys ive cast. generally speaking 20psi LP : 40psi Oxy. start by lighting just LP and open the flame up a bunch. then turn on your oxygen wide open. back the flame down on the LP until you get the cones where they should be and you hear that loud loud hissing noise. this does 2 things, #1 it ensures you have proper oxygen flowing through the flame, and #2 if you follow this step every time you will get the SAME flame every time you fire it up. only changes in the regulators will be needed to adjust your flame.</p><p>3rd, be sure you are casting with fresh alloy. i dont know the advice on this particular alloy but im guessing its not to use any more than 50% old alloy.</p><p>4th, any reheated alloy should be well sandblasted to remove all oxide layers, and any nasty spots of burnt alloy should be removed</p><p>5th, as stated above, an extra wind on your centrifuge will be needed for these types of alloys. the required force to move the semi-fluid mass is greater than high gold content alloys.</p><p>6th,due to the nature of the NP alloys, they rarely pool and become a nice fluid mass. they basically just slump, sometimes looking like a raisin or wrinkled mass of metal.</p><p>7th, before doing any of this please be sure you have proper eye protection! these alloys require a nasty flame that can do serious retina damage very quickly <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /></p><p></p><p>hope this helps you some, keep us posted</p></blockquote><p></p>
[QUOTE="sidesh0wb0b, post: 135418, member: 7594"] yeah opposite side of the pond, US here. let us know how you do, though your torch is fine. the melting range for dSign 30 is 1145C-1165C....casting temp being 1240-1350C. Ivoclar said to use a flux? thats strange, though it shouldnt hurt anything. but i dont think you should need it. first advice.....agreed with Bumfrey....preheating the crucible and metal will help (but have your torch ready when you pull it out of the furnace, you dont want an oxide layer forming). also be sure you are using the proper multi-orifice torch tip. 2nd, your oxygen doesnt need to be much more than 2x your LP setting. i have never cast dSign 30, but its not far from other type 5 alloys ive cast. generally speaking 20psi LP : 40psi Oxy. start by lighting just LP and open the flame up a bunch. then turn on your oxygen wide open. back the flame down on the LP until you get the cones where they should be and you hear that loud loud hissing noise. this does 2 things, #1 it ensures you have proper oxygen flowing through the flame, and #2 if you follow this step every time you will get the SAME flame every time you fire it up. only changes in the regulators will be needed to adjust your flame. 3rd, be sure you are casting with fresh alloy. i dont know the advice on this particular alloy but im guessing its not to use any more than 50% old alloy. 4th, any reheated alloy should be well sandblasted to remove all oxide layers, and any nasty spots of burnt alloy should be removed 5th, as stated above, an extra wind on your centrifuge will be needed for these types of alloys. the required force to move the semi-fluid mass is greater than high gold content alloys. 6th,due to the nature of the NP alloys, they rarely pool and become a nice fluid mass. they basically just slump, sometimes looking like a raisin or wrinkled mass of metal. 7th, before doing any of this please be sure you have proper eye protection! these alloys require a nasty flame that can do serious retina damage very quickly :) hope this helps you some, keep us posted [/QUOTE]
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Non Precious Casting Trouble- Help!!!
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