Copper Oxide Black
Formula: CuO
| DENS - Density (Specific Gravity) |
6.45 |
| MLPT - Melting Point (MP) |
1326C M |
One of the oldest colorants used by potters. It is a popular source of copper in glazes and glass. It is a very strong flux, in a mix of 50% Ferro borax frit 3134 it will dissolve a firebrick crucible at cone 6! It is the most stable form of oxidized copper (Cuprous oxide oxidizes to cupric oxide in normal firings).
The oxide form of copper can give a speckled color in glazes whereas the carbonate form will give a more uniform effect.
Copper normally produces green colors in amounts to 5% where it moves toward black. In reduction firing, it turns to Cu2O and gives vibrant red hues. It the glaze is fluid copper will tend to crystallize heavily. See CuO and Cu2O in the oxides database for more information.
Above 1025C copper becomes increasingly volatile and its crystalline structure breaks down. At 1325C CuO melts. This can affect the color of other glazes pieces in the kiln. Glazes containing copper can change significantly because of loss of copper. Some potters alternate between reduction and oxidation, and even put a dish filled with copper carbonate in the center of the kiln to minimize this phenomenon.
There are many workable copper ores (i.e. tenorite, cuprite). Source: American Chemet Corp., 708-948-0800 FAX 708-948-0811
See also: "Coloring Mechanism of Peach Bloom Copper Red Glazes" written by four technicians from China published in Dec 91 Bulletin of the American Ceramic Society.
Out Bound Links
In Bound Links
- (Articles - Unspecified)
Leaching Cone 6 Glaze Case Study An example of how we can use INSIGHT software to determine of a glaze is likely to leach - (Materials - Related)
Copper Carbonate - CuCO3
Synthetic Malachite, CuCO3
- (Materials - Related)
Copper Oxide Red - Cu2O
Cu2O, Red Copper, RCO, Copper (I) Oxide, Cuprous Oxide
- (Oxides - Closest material equivalent)
CuO - Cupric Oxide
- (Materials - Related)
Copper Carbonate Basic - CuCO3.Cu(OH)2
Cupric Carbonate, Copper (II) Carbonate, Azurite
Pictures
Metallic oxides with 50% Ferro frit 3134 in crucibles at cone 6ox. Chrome and rutile have not melted, copper and cobalt are extremely active melters. Cobalt and copper have crystallized during cooling, manganese has formed an iridescent glass.
Copper can produce bright red glazes in correct reduction firing
copper oxide in a transparent oxidation glaze
Copper red reduction glaze cone 9 courtesy of Angela Walford
Copper oxide (2%) added to an otherwise stable cone 6 glaze fluxes it considerably
XML for Import into INSIGHT
<?xml version="1.0" encoding="UTF-8"?>
<material name="Copper Oxide Black" descrip="" searchkey="Copper (II) Oxide, Black Copper, BCO, Cupric Oxide" loi="0.00" casnumber="1317-38-0">
<oxides>
<oxide symbol="CuO" name="Cupric Oxide" status="" percent="100.000" tolerance=""/>
</oxides>
</material> | 
The future of ceramic recipe, material and physical testing record keeping is here.
Maintain your recipe database on-line
- Login to a private account or work with others in a group account (e.g. university).
- Nothing to install (access it using your web browser). It is always the latest version.
- Easy to import your existing data.
- As many side-by-side recipes as you want.
- Many ways to search and classify glaze and body recipes.
- Glaze and body recipes are robust, with units-of-measure, unlimited pictures with individual titles and descriptions.
- Add variations to a recipe; each with its own pictures, descriptions and name/code-number extensions.
- Recipes can link to typecodes, projects and firing schedules (all managed in their own areas).
- Standard reports and mix ticket reports with last-minute-totalling; variations report as if they are a complete recipe.
- Video tutorials, help system, contact form on every page, dedicated messaging and support ticket systems.
- It is an industrial-strength database system (unlimited capacity, fast, reliable, scalable).
Imports many file formats
- Glaze recipe formats supported: HyperGlaze, GlazeGhem, GlazeMaster, Matrix, INSIGHT XML recipes (single and multiple), INSIGHT SQLite DB files.
- Assign a batch number to imports, and later search by batch.
- Assign multiple typecodes to imported glaze and body batches (to classify) and search on these later.
- Prepend character sequences to glaze recipe names during import.
- Import the pictures and pair them to their corresponding records automatically.
- One click to automatically export the database to an SQLite DB database file and download it (for use with desktop INSIGHT or just as a backup).
- Export and import individual glaze recipes as text or XML.
Perfect for Education
- Ceramic study programs can now accumulate material, recipe and testing data year-after-year, students can login and together build a valuable ceramic glaze and body knowledge resource.
- Students already have internet connected devices, computers are not even needed in the class.
- The Reference Manager gives you quick access to the Digitalfire Ceramic Reference Database.
Learn more..
|
Watch the video or sign-up at http://insight-live.com.