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Bryan Johnson

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About Bryan Johnson

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  1. rock polisher. I use the rotary ones, some use vibratory.
  2. Since I use colored porcelain some techniques might not work with stone ware. This is a short form of process. 1 make earring (I use a very white cone 6 porcelain) 2 put in holes for wire or cord while wet 3 dry 4 fill quart bowls with pieces. 5 010 bisque 6 tumble polish for 2-12 hours, til edges rounded and surface smooth 7 clean & adjust holes with diamond bit 8 high fire laid flat on kiln shelf 9 tumble polish (no grit needed) 10 sort 11 wire
  3. The cross section of extrusions are generally the most interesting. Assembled extrusions.
  4. Are you sure that the vacuum is getting to the clay?
  5. The critique of neph sy is that it breaks down the oxide layer(reduction?) and also the aluminum (oxidation?). Years ago Ivor Lewis, on clay art said that the oxide layer is amphoteric, so I suppose it could also be oxidation . Then to counteract the problem we add epsom salts, a mild acid, which seems like should be more likely to break down an oxide layer.
  6. I think that what I am trying to figure out is why the nepheline, the component that is missing a silica would react with the oxide layer or the metallic aluminum to form pits and a hard deposit. Nepheline should react with silica to form feldspar, not with alumina.
  7. I am mostly interested in what happens with Neph Sy in clay. The explanations that I have read seem incomplete. Neph Sy is often said to have soluble sodium- where is that from and what form does it take?
  8. I am looking for some more details on aluminum pitting and the hard material that forms in proximity to the aluminum. The soluble sodium must be reacting to something, but what is formed when it dissolves? Does that play a role/or is the main contributor?
  9. https://www.jakecorboy.com/colored-porcelain?fbclid=IwAR05iEqnek_lJF0NhiWP2nyLGpL3q6BeOKMW4fVe1BiDWFqrGOJ1hiz4dLs worth looking at for color ideas.
  10. Try running a magnet through the beach sand. If you get little black particles they will work.
  11. Show us the cones. (Oops, that reminds me, I forgot cones in the bisque I just loaded)
  12. wet-wetx%shrinkage= fired or wet X shrinkage=fired or wet X(100-shinkage)=fired and fired/(100-shrinkage)=wet for 12% for 12% 1"/.88=1.13636363" .75"/.88=0.852272727" for 10% 1"/.90=1.11111111" .75/.9=0.824175824"
  13. To test for and compensate for soluble sodium with epsom salts use 1/2 of 1% of dry weight. or a few drops of saturated solution on a ball of clay that you wedging. If it works you'll notice a change in consistency. Put a couple table spoons in a jar, cover with hot water and optionally microwave 'til dissolved.
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