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Thermal Evaporation

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Megatech vacuum evaporation sources are manufactured from the finest materials available. Filaments are wound from standard Tungsten wire of high purity thereby providing the best non-contaminating sources available. A wide range of standard items are available and these are all normally held in stock at the Megatech factory for immediate shipment. A telephoned order number is all that is required to release the goods and 24 hour delivery service is possible to most customers. All SOURCES ARE NORMALLY IN STOCK, however if any item is not in stock at time of order it will be dispatched at the earliest date possible, or an alternative item will be suggested. Partial shipments are also possible.

In addition to the standard product range we can design and supply tungsten filaments to your unique specifications.

NOTE: Value of current required given for each source is that current needed to raise the temperature of the source to 1000 deg. C at 5 VAC. The value given is approximate and is intended as a guide in matching sources with available power.

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Subcategories

  • Chrome Plated Tungsten Rods


    Megatech offers an effective, user friendly way to evaporate Chromium. The Chrome plated tungsten rods are used for thin films of Chromium in the electronics and optics industries. The advantage of using Chrome rods over Chrome chips are better thermal efficiency, regulation of film thickness and elimination of spitting and spalling which can cause pinhole type defects.

  • Tungsten / Alumina Crucibles


    Alumina coated evaporation sources have been developed to replace alumina crucibles for some specific applications. The advantages of this type of evaporation source is good heat transfer and the inertness of alumina with most metals. Also, the evaporant does not wet the alumina resulting in no resistant change of the boat when the evaporant melts. Due to the non wetting characteristics of alumina, the evaporant forms a sphere when melted resulting in a point source. This type of evaporation source will give long life compared to the non protected sources. Coated sources will require from thirty to fifty percent more power to effect an evaporation do to the difference in heat conduction. The alumina is semi-conductor grade and is applied to the boat or basket by a plasma spray technique. Temperatures of 1850 degrees C should be avoided, and when an evaporation is effected the power should be reduced slightly to avoid over heating.

  • Alumina Coated Boats

    Alumina coated evaporation sources have been developed to replace alumina crucibles for some specific applications. The advantages of this type of evaporation source is good heat transfer and the inertness of alumina with most metals. Also, the evaporant does not wet the alumina resulting in no resistant change of the boat when the evaporant melts. Due to the non wetting characteristics of alumina, the evaporant forms a sphere when melted resulting in a point source. This type of evaporation source will give long life compared to the non protected sources. Coated sources will require from thirty to fifty percent more power to effect an evaporation due to the difference in heat conduction. The alumina is semi-conductor grade and is applied to the boat or basket by a plasma spray technique. Temperatures of 1850 degrees C should be avoided, and when an evaporation is effected the power should be reduced slightly to avoid over heating.

  • Boat Sources

    Evaporation Boats are capable of depositing a wide variety materials. Megatech offers an extensive selection of standard tungsten boats, tantalum boats and molybdenum boats available in a variety of materials and thicknesses. If you need help in selecting the right boat for your process, please give our technical staff a call.

  • Tungsten Baskets

    Tungsten Evaporation Baskets offer an effective method of reaching high temperatures with low current. The benefits of using tungsten baskets as an evaporation source for your deposition process include low cost, ease of use, multi-directional coatings and low power requirements. Actual parts may look different based on the type of wire selected.



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