Notícias de jóias

pulseiras de prata esterlina no atacado Qual é a condutividade térmica das gemas?

Postado em por Kingjy

The thermal conductivity of a gemstone refers to the property of an object that can conduct heat. A large number of molecules, atoms, ions or free electrons that make up a substance collide with each other, so that heat is transferred from the higher temperature part to the lower temperature part. In general, materials with strong electrical conductivity have strong thermal conductivity, and objects that do not conduct heat are called thermal insulators.

The heat conduction properties of different gems vary greatly, so thermal conductivity can also be used as one of the identification characteristics of gems. Thermal conductivity is expressed in terms of thermal conductivity (em), and the unit is W/(m.K). The thermal conductivity needs to be measured with a specific instrument in a specific experimental environment. The gem industry generally expresses the relative thermal conductivity of gems in terms of relative thermal conductivity. The relative thermal conductivity is determined based on the thermal conductivity of silver or spinel. The thermal conductivity of diamond is tens to thousands of times higher than that of other gems. If the thermal conductivity of spinel is l, the relative thermal conductivity of diamond is 56.9 para 170.8, the relative heat of gold The conductivity is 44, the relative thermal conductivity of silver is 31, the relative thermal conductivity of corundum is 2.96, the relative thermal conductivity of topaz is 1.59, and the relative thermal conductivity of most other non-metallic gemstones is less than 1.

The thermal conductivity meter is designed and manufactured according to the thermal conductivity of gemstones. It is a gemstone identification instrument with a more specific purpose. Since diamond has extremely high thermal conductivity among all gems, surpassing others, thermal conductivity meter is mainly used to identify diamonds and their imitations. Other gems such as corundum, topaz, and spinel also have strong thermal conductivity, and sometimes they can be identified with a thermal conductivity meter.

No entanto, it should be noted that: Synthetic moissanite is a newer diamond imitation of Lb LC, and it has stronger thermal conductivity, and it will also emit a diamond reaction when it is detected by a thermal conductivity meter. Portanto, you must be careful when using the thermal conductivity meter to identify them.

 

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