Note: If you haven't already; read part 1 first.
Lets start by defining a few words in laymans terms.
Adhesion: bonding together of unlike substances (molecules in our case)
Fused: or fusing: joining together of like substances in the molten or near molten state.
Alumina: Aluminum oxide: the non-conductive and heat resistance coating formed on resistance wire when we heat our coils.
Covalent bond: the molecular alignment of atoms within alumina which hold it together as a material.
Diffusion: the phenomena by which alumina is formed. 2 aluminum atoms on/near the surface of the wire react with 3 oxygen ions in the air (or juice) when heated and a new compound is formed eg. A2O3 ( alumina).
So lets start with alumina development. Aluminum is highly reactive. That is, it's much more willing to give up its atoms (diffuse them) than the chromium or iron in our wire. Alumina formation is parabolic. Having very fast formation at first then slowing as the aluminum atoms become less available at the surface of the wire. Alumina formation only occurs where oxygen ions and aluminum atoms are present. That is, primarily at the surface of the wire where the aluminum atoms are readily available. Alumina has very high adhesion to the surface of the wire where it is formed. Alumina which was previously formed is pushed outward by new alumina formation at the alumina/wire surface interface forming new covalent bonding.
So when we fire our new microcoils and alumina is formed between adjacent (neighboring) winds two things happen very very quickly. A super high strength dialectric (high resistance) layer is formed and the coils are physically pushed apart disallowing the "fusing" together of the metals in the wire. And because the alumina is formed primarily at the alumina/wire surface interface where reactive aluminum atoms are most abundant but very little at the outermost surfaces of the alumina crystals you will not likely see any significant covalent bonding between the alumina of adjacent winds.
Sintering however is a common method for bonding covalent materials like alumina. Only problem is before we could reach the sintering temp for alumina (2000°f plus) our coils would likely be destroyed from excessive heat.
So imo adhesion, bonding or fusing together of adjacent winds is not happening. Test it for yourself as I did in part 1. If anyone still has doubts and would like to see part 3 just say so. I'd love to talk on grain boundary migration, electron/proton relationships and atomic orbit radii!!!
Just kidding.........or aaaam I? Lol
Hope this gives those of you with inquiring minds something to google!
cig
Lets start by defining a few words in laymans terms.
Adhesion: bonding together of unlike substances (molecules in our case)
Fused: or fusing: joining together of like substances in the molten or near molten state.
Alumina: Aluminum oxide: the non-conductive and heat resistance coating formed on resistance wire when we heat our coils.
Covalent bond: the molecular alignment of atoms within alumina which hold it together as a material.
Diffusion: the phenomena by which alumina is formed. 2 aluminum atoms on/near the surface of the wire react with 3 oxygen ions in the air (or juice) when heated and a new compound is formed eg. A2O3 ( alumina).
So lets start with alumina development. Aluminum is highly reactive. That is, it's much more willing to give up its atoms (diffuse them) than the chromium or iron in our wire. Alumina formation is parabolic. Having very fast formation at first then slowing as the aluminum atoms become less available at the surface of the wire. Alumina formation only occurs where oxygen ions and aluminum atoms are present. That is, primarily at the surface of the wire where the aluminum atoms are readily available. Alumina has very high adhesion to the surface of the wire where it is formed. Alumina which was previously formed is pushed outward by new alumina formation at the alumina/wire surface interface forming new covalent bonding.
So when we fire our new microcoils and alumina is formed between adjacent (neighboring) winds two things happen very very quickly. A super high strength dialectric (high resistance) layer is formed and the coils are physically pushed apart disallowing the "fusing" together of the metals in the wire. And because the alumina is formed primarily at the alumina/wire surface interface where reactive aluminum atoms are most abundant but very little at the outermost surfaces of the alumina crystals you will not likely see any significant covalent bonding between the alumina of adjacent winds.
Sintering however is a common method for bonding covalent materials like alumina. Only problem is before we could reach the sintering temp for alumina (2000°f plus) our coils would likely be destroyed from excessive heat.
So imo adhesion, bonding or fusing together of adjacent winds is not happening. Test it for yourself as I did in part 1. If anyone still has doubts and would like to see part 3 just say so. I'd love to talk on grain boundary migration, electron/proton relationships and atomic orbit radii!!!
Just kidding.........or aaaam I? Lol
Hope this gives those of you with inquiring minds something to google!
cig
