Synthetic Diamonds: Patent 5437243 Conversion w/ Supercritical Current?

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Discussion Overview

The discussion centers around the patent 5437243, which proposes a method for converting graphite to diamond using a supercritical current. Participants explore the validity of the patent's claims and the underlying principles of diamond synthesis, as well as alternative methods for diamond production.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested
  • Mathematical reasoning

Main Points Raised

  • One participant questions the feasibility of using a supercritical current to rearrange the bonds of a crystal structure to achieve allotropic conversion from graphite to diamond.
  • Another participant suggests that if the conversion is successful, it would not be accurate to label the product as "synthetic diamond," as it would be an actual diamond.
  • There is a discussion about the broad definition of "synthetic" and how it encompasses various compounds and techniques.
  • A participant proposes an alternative method involving a Z-pinch reactor to generate high pressure and temperature to convert graphite to diamond, noting potential challenges such as the skin effect and insulation issues.
  • Questions are raised about the duration required for allotropic conversion at high pressures and temperatures, specifically whether microsecond timescales would be sufficient.
  • One participant acknowledges that their proposed method has no direct relation to the phenomena described in the patent.

Areas of Agreement / Disagreement

Participants express differing views on the implications of the patent's claims and the definition of synthetic diamonds. There is no consensus on the feasibility of the proposed methods or the validity of the patent.

Contextual Notes

Participants highlight limitations such as the skin effect in the proposed Z-pinch method and the need for further information on the duration of the allotropic conversion process.

lilrex
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There is a patent (5437243) that describes a method of allotropic conversion of graphite to diamond using a supercritical current (1,000,000 columns) 4 microseconds >1000 volt potential.

The patent sounds a little iffy and of course I do not understand the principles behind the claim. I was wondering if anyone has some insight on this. Can you re-arrange the bonds of a crystal structure with current?
 
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well.. if it actually carries out an allotropic conversion.. it isn't really a synthetic diamond.. it's an actual diamond..
 
Yea I guess you are right, "synthetic" can cover a wide variety of compounds and techniques.
 
I have not found any more information on this method of diamond production. however I wonder if one could cause a strong enough magnetic field to compress a diamond in a Z-pinch arrangement. according to my first glance calculations if one set up a Z-pinch reactor with a current of 1,000,000 amps, a 2.2TW discharge could produce 315.76 KBar of pressure on a graphite specimen .62cm in diameter and 2.54 cm long. With a proper duration of pulse the graphite could be heated to 2500K thereby accomplishing the conversion from graphite to diamond.

Of course there is the skin effect that would vaporize the outer periphery of graphite and not heat the core, so the whole "simple" setup is flawed anyway. Not counting the various other problems like insulating against flashover of 1.6MV across 2.4cm and so forth.

I wonder if I could come up with something that could collapse a copper tube and pre-heat the graphite to temp. That way the Z-pinch would use considerable less power and still accomplish the pressures.

Does anyone know how long the allotropic conversion at or above the “diamond/ diamond metastable graphite” line takes to convert? e.g. will < us time work?

But all of this has no relation to the phenomena described in the mentioned patent
 

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