Many people encounter aluminium every day when drinking from a soda can -- yet the metal can also be transformed into a beautiful work of art through a casting process. Creating sculptures from cast aluminium starts with a design in clay. The artist, or a professional foundry worker, can then use a style called the lost wax method to copy the exact ceramic design into wax, fill the resulting shape with metal and turn it into a cast aluminium sculpture.
- Skill level:
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Things you need
- Rubber skin moulding
- Moulding wax
- Investment plaster
- Melted aluminium
- Safety goggles or a full-face shield
- Thick cotton long-sleeve shirt and trousers
- Leather boots
- Leather gloves
Pummel a block of clay to prepare it for sculpting. Roll the clay in your hands until it is soft and easy to work with. Keep it moist while working and cover the material when not working with it to prevent drying.
Sculpt the clay into a design you want to cast in aluminium. Start with a basic shape, such as the body, head and limbs of a person, to create the general size and proportion of the art. Later, add details to the design and smooth out any rough edges. Ensure that the clay is balanced and can stand on its own.
Allow the clay to dry completely. This will take at least two days; larger pieces will take longer. Fire your piece in a kiln following the manufacturer's directions for your type of clay. This will turn it into a sturdy ceramic sculpture.
Create a rubber skin mould of the sculpture's exterior. Paint the rubber skin liquid on the surface of the sculpture, or seek a foundry worker to do this for you. When it dries, this material will pick up each detail of the art piece. Remove the rubber mould from the ceramic sculpture.
Coat the inside of the rubber mould with melted wax. Create a 1/4-inch thick layer around the inside of the mould. Allow the wax to dry and remove the rubber mould. You will now have a hollow replica of your ceramic sculpture.
Pour an investment plaster inside the wax replica and apply it to the outside of the piece as well. This plaster, which is mixed with sand and other refractory aggregates, creates a shell around the wax mould and holds the aluminium as it takes the shape of the wax.
Put on protective gear, including leather boots and gloves, and safety goggles or a full-face shield. Wear thick cotton clothing, including a long-sleeve shirt and trousers, which won't melt under the high heat.
Pour melted aluminium into the plaster mould. The hot aluminium will melt and replace the wax inside the mould.
To reveal your cast aluminium sculpture, shatter the outside of the mould with a hammer once the metal begins to harden. When the metal is completely dry, polish the aluminium to whatever texture you desire.
Tips and warnings
- Many artists choose to hire a professional foundry worker to make the castings of the ceramic sculpture and pour the metal.
- Ensure the work area is well ventilated.
- When pouring melted aluminium, work over dry sand to catch any liquid spills.
- Remove any flammable materials from the foundry area to prevent fires.
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