[Jewelry making - Article 00275] - Re: [Orchid] The Metallurgy of Keum-boo

[JoJu428]

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>      But in it he says that the metal is heated above its melting
>     point, which creates spaces in the lattice so that diffusion takes
>     place. Very nice. 
 

    Dear Alan, that statement bothered me also and I'm afraid the
    explanation does not explain what is happening. I have always looked
    upon the process in a rather simple way. Since molecules are always
    in motion, the addition of heat,however small, will increase the
    velocity of the molecules in both sheets of metal. At a certain
    point (tempature) the velocity of these molecules will permit some
    to escape from the surface and if there is no barrier between the
    two surfaces, such as air or an oxide of a metal, these molecules
    can intermingle with each other and thereby create a bond. The
    burnishing creates that intimacy of contact which permits this
    intermingling of enough molecules to effect this attachment. This is
    not like the fusion metals which takes place in creating a billet for
    mokume gane technique. 

    I know this may be a simple explanation and may not be entirely
    scientific, but it helps me understand the process. Perhaps our
    resident scientist John can offer an explanation.   Joe Dule  

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