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Altering The Firing Range & Improving The Coating Qualities


sarahm18

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The following is a S. Murfitt recipe:-

 

Barium Carbonate 40

Potash Feldspar    35

Zinc Oxide             15

China Clay               5

Quartz                     5

+ Nickel Oxide          0.5

 

I need to lower the firing temperature from 1260 deg C to 1222 deg C and improve the coating qualities as it crazes on application and can flake off before firing.

 

Robin Hopper's book the Ceramic Spectrum suggests the following the reduce the firing range:-

1. Remove some China Clay. This I feel is inadvisable as there is so little in the recipe as it stands.

2. Increase the Quartz, Potash Feldspar or Zinc Oxide.

3. Substitute Nepheline Syenite for the Feldspar.

 

To improve the coating quality he suggests:-

1. Increase the clay by adding Bentonite.

2. Add CMC or Gum Arabic.

 

 

I would much appreciate any advise on which of these options is most likely to solve this double problem.

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