Cast Jewelry

Cast Jewelry. 30 min. Artsmart Video, 1989. Crystal Productions.com... 

Platiaum jewelry alloys are easily worked and readily melted and cast. However, they are difficult to machine, resultiag ia severe tool wear. Pure platiaum (99.95%) ia the form of coias and iagots is used as an investment metal. 

In consumer appHcations, titanium is used in golf club heads, jewelry, eyeglass frames, and watches. The Japanese have promoted the use of titanium in roofing and monuments. Other appHcation areas include nuclear-waste storage canisters, pacemaker castings, medical implants, high performance automotive appHcations, and ordnance armor. 

Precision dupHcation, durabiHty, and metallic beauty have made antimonial alloys, such as pewter and britannia metal, desirable for decorative castings. Several different tin—base and lead-base antimony alloys are used in the jewelry industry. These alloys are typically cast in mbber or siHcone molds. 

Aluminum is unique among the metals because it responds to nearly all of the known finishing processes. It can be finished in the softest, most delicate textures as exemplified by tableware and jewelry. Aluminum can be anodized and dyed to appear like gold. It can be made as specular as a silver mirror and jet black. The metal also can be anodized to an extremely hard, wear- and abrasion-resistant surface that approaches the hardness of a diamond. Aluminum is available in many convenient forms-shapes, sheet, plate, ingot, wire, rod and bar, foil, castings, forgings, powdered metals, and extrusions. 

In addition to the alloys listed in Table 6.3, bronze has been known since ancient times. Bronze is 70-95% copper, 1-25% zinc, and 1-18% tin. Bronze is not used extensively in jewelry, but it is used for casting sculptures and medals that must remain permanently in good condition. Another alloy, Wood s metal, made of 50% bismuth, 25% lead, 13% tin, and 12% cadmium, has such a low melting point, about 70°C, that it would not be suitable for jewelry use.5... 

Metals can be shaped and designed into an immense variety of jewelry pieces. In Chapter 6 we sawed and soldered metal and cast molten metal to produce pieces of jewelry. Using electrolysis, we added metal coatings to the jewelry pieces. It is necessary to consider health precautions that should be taken regarding metalwork. 

Metals, usually gold and silver, are often cast to make rings and other small jewelry pieces. In lost wax casting, a wax pattern for a jewelry piece is burned out of a mold. A large variety of waxes, such as beeswax, paraffin, and tallow, can be used. The waxes can release formaldehyde and acrolein. 

Sterling silver, silver, and copper, or gold, can be used to cast a jewelry piece with a minimal amount of health hazard. Alloys with large amounts of cadmium, chromium, nickel, antimony, and arsenic should not be used. 

Among the objects most susceptible to successful radiographic study are those with well-defined internal structures such as cast bronzes, jewelry, furniture, musical instruments, and ceramics. The variety of materials that have been studied is described in the literature. For example Bridgman reported on the radiography of museum objects (9), Gettens examined Chinese bronzes (iO), Gorelick studied cylinder seals... 

Besides royal gold jewelry, they made artistic brass weights, spoons, and boxes. They also worked copper, zinc, tin, lead, and nickel. They cast objects in brass by the lost wax method. In this process, shapes were carved in wax, then encased in clay and baked. The hot wax was poured out, leaving a ceramic mold. 

Uses Wall plasters, gypsum wallboard, tiles, stucco, blocks, and moldings for building industry statues jewelry castings paper industry pharmaceuticals (plaster of Paris bandages, orthopedic and dental casts) Regulatory FDA approved for orals JP compliance... 

Only when man had learned to produce bronze, stone tools were completely replaced with bronze ones. Most likely bronze was first obtained by chance. This is evidenced by the archaeological finds on the island of Crete dating back to about 3500 B.C. which revealed not only copper but bronze articles as well. At first bronze was rather expensive and was used mainly for jewelry and luxury articles. In ancient Egypt mirrors were made from bronze. Bronze, like copper, proved to be an excellent material for relict makers and sculptors. As early as the 5th century B.C. man learned to cast bronze statues. Particular progress in bronze sculpture was made in ancient Greece beginning with the Mycenaean period. At our times copper and bronze still retain this role. 

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