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Bronze is the most popular metal for cast metal sculptures; a cast-metal sculpture of bronze is often called a bronze. Common bronze alloys have the unusual and very desirable property of expanding slightly just before they set, thus filling the finest details of a mold.
The strength and lack of brittleness (ductility) of the material is an advantage when figures in action are to be created, especially when compared to various ceramic or stone materials (see marble sculpture for several examples). These qualities allow the creation of extended figures (as in Jeté), or figures that have small cross sections in their support (such as the equestrian statue of Richard the Lionheart), both shown to the right. The value of the bronze for other uses is disadvantageous to the preservation of bronze scuptures; few large ancient bronzes have survived as during wartime many were remelted to make weapons or to create new sculptures commemorating the victors, while a far larger portion of contemporary stone and ceramic sculptures have survived, even if only in fragments subsequently reassembled.
The manufacture of bronzes is highly skilled work, and a number of distinct casting processes may be employed, including lost-wax casting (and its modern-day spin-off ceramic shell casting), sandcasting and centrifugal casting. In the lost-wax casting method, the artist starts with a full-sized model of the sculpture, most often a clay model. A mold is made from the clay pattern; a wax is then cast from the mold. The wax is then invested in another kind of mold or shell, which is heated in a kiln until the wax runs out. The investment is then filled with molten bronze. Students of bronze casting will usually work in direct wax, where the model is made in wax. Should the casting process fail, the artwork will also be lost.
Another form of sculptural metal art to use bronze is ormolou. Ormolou is a finely cast soft bronze that is then gilded (coated with gold) which results in a matt gold finish. Ormolou was popularised in the 18th century in France and is typically found in such forms as wall sconces (wall mounted candle holders), inkstands, clocks and garnitures. Ormolou wares can be identified by their matt gold finish and clear ring when tapped, this indicating the underlying bronze as opposed to a cheaper metal alloy such as spelter or pewter.
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"Bronze sculpture".
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