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• #7 apatyas Korrektor #45185024 #3

  Új Válasz 2018-04-25 13:15:51 #7

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  apatyas

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  válasz #45185024 #3 üzenetére

  Hogy ő meddig melegítette azt nem tudom, de az indium 157 °C-on olvad.

  [link:]
  "Indium (Figure 4) is the only known material which can stick to both, copper and silicon. At the same time, solidifying indium doesn’t shrink much which leads to a small factor of thermal tension inside the Thermal Interface Material. The thermal conductivity is not as high as copper but higher than any other thermal interface material 81.8 W/(m*K). Common thermal compounds have a conductivity of about 5-10 W/(m*K).

  In addition, indium is very ductile which allows thermal expansion of substrate and heatspreader without damaging any of the components involved. Indium melts at 157 °C.

  Before we start with the soldering details there are few things you need to know about indium. Similar to aluminium, indium forms a small oxide layer exposed to ambient air. Indium is a post-transition metal and very rare on earth. Compared to the worldwide gold production of about 3000 tons per year, indium is extremely rare. The world production of indium does not even reach 1000 tons per year. The average price of indium was about 800 USD per kilo in 2014. The price dropped now to about 400 USD, but the material is still pretty expensive. Depending on the size of the CPU, the raw indium will already cost about 2-5 USD."

  pezo77 #5 2017.12.14. 13:29 Hmm. És ez az e-hajó akkor hol is tud kikötni? Az e-bay -ben? ;)

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