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F.C. Gold Casting
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<blockquote data-quote="dmonwaxa" data-source="post: 21200" data-attributes="member: 927"><p>My gosh Charles, there must be an echo in here or this is dejavu. Someone who finally side with me. Yes burnout is at 900 when using the "hygroscopic" technique to achieve expansion, I believe it was 100F or 105F at 45 mins. if my memory serves me right. High heat technique; Hi temp 1200F. Since Beautycast is a gypsum based investment it does not hold up well to prolonged high temps unlike phosphate bonded type investments. Like you, I think the temp of the melt should be of concern since oxygen is being used. Oxygen of high burn out temp and high melting temp causes the metal to boil per se in the mold. The outer surface solidifies and the internal bulk of the metal remains molten which causes unusal strain in the matrix resulting in voids in the casting. Now the extent to which this happens is depedent on two variables; time and temp. Can I get an amen.</p></blockquote><p></p>
[QUOTE="dmonwaxa, post: 21200, member: 927"] My gosh Charles, there must be an echo in here or this is dejavu. Someone who finally side with me. Yes burnout is at 900 when using the "hygroscopic" technique to achieve expansion, I believe it was 100F or 105F at 45 mins. if my memory serves me right. High heat technique; Hi temp 1200F. Since Beautycast is a gypsum based investment it does not hold up well to prolonged high temps unlike phosphate bonded type investments. Like you, I think the temp of the melt should be of concern since oxygen is being used. Oxygen of high burn out temp and high melting temp causes the metal to boil per se in the mold. The outer surface solidifies and the internal bulk of the metal remains molten which causes unusal strain in the matrix resulting in voids in the casting. Now the extent to which this happens is depedent on two variables; time and temp. Can I get an amen. [/QUOTE]
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