What is the difference between plaster used in gold investment casting and ceramic used in the process of investment casting of automobile engine parts and turbineblades etc. When both are used in the lost-wax method?

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In grey iron sulpher was above 0.15% what react on metal?

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What is dielectric medium in EDM ?

0 Answers   NIC,

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sir.I am OBC candidate,recieved scholarship/freeship during academic year 2011-2012,2012-2013(my yearly income was below 4.5 lakh).my yearly income during academic year 2013-2014 was above 4.5 lakh.should I get scholarship/freeship in academic year 2013-2014 ?

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Define what is widman statten structure?

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How gold can be separated from mercury?

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Define what is the chemical composition of ceramic and define what is its atomic density?

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What is Redlich Kwong equation?

0 Answers   Essar,

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How much gold concentration should be in the organic phase (dbc) before reduction by oxalic acid solution?

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I currently use 17-7 PH stainless which is hardened to condition CH after forming. raw matl is .1.75"X .12" X .008". Its main usage after hardening is silicon wafer retainer where it's contantly cycled up and down to putin and remove wafer after 40-60 sec process at 400C temp. At this high temperature this part seemed to deform after a a couple of hundred wafer which is what it was designed for in the first place. THere is a proposal to go to a different material to increase lifeline of this part. My question is..... can 321 SST be a plugin replacement. I know this has a higher temp rating but how about its forming characteristics, will it have spring properties, and wont become brittle after prolonged exposure to 400C.

0 Answers   Novellus,

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We make aluminum moulds by press casting, can you suggest any thing so that the moulds should shine after casting?

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What is heat treatment?

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