Melting Platinum with UltraMelt 5P

Melting Platinum with UltraMelt 5P


250 g of platinum is added to the ceramic crucible. The platinum is scrap pieces, in various sizes and shapes. UltraMelt 5P is turned on. Always wear proper safety equipment when operating the UltraMelt. The engineer is wearing welding safety googles to allow him to watch the melting progress in the crucible. Tools: Tongs for handling the hot crucible, and a lid or cap for the hot crucible Because we started with scrap material, the engineer taps on the crucible to settle the material and help the heat distribute throughout the material. A cap or lid is placed on the crucible to minimize heat loss. In this case, another crucible is used as the cap. As power is applied, the platinum begins to melt and flow to the bottom of the crucible. The tapping helps to loosen pieces of the scrap platinum to drop into the molten platinum. Note: the temperature to melt platinum is over 1750C. Due to the high heat, crucibles used for platinum should only heat the material while it’s molten for 3-4 minutes. Exceeding this timeframe can result in the crucible cracking. After 2 minutes 37 seconds of heating, the platinum is molten at the bottom of the crucible. After 4 minutes 35 seconds of operation, the platinum is molten, and the UltraMelt 5P is turned off. In this case we do not have a mold, so we are not pouring the molten platinum out of the crucible. The crucible is turned upside down during cooling, to allow the platinum to eventually fall out of the crucible. Avoid cooling using forced air or other artificial methods during the cooling process, as this can result in the crucible cracking. Periodically tap the crucible as it cools to lightly loosen the platinum. After about 6 minutes of cooling, an audible *pop* is heard, and the platinum releases from the crucible A small amount of the crucible has flaked off and is on the surface of the Platinum. Once the platinum has cooled, this can be rubbed off.

Leave a Reply

Your email address will not be published. Required fields are marked *