EVOCHEM’s comprehensive product portfolio of evaporation materials offers you the best solution for your individual application. The high-purity evaporation materials help to achieve your desired coating properties; their optimized melting properties improve the production yield. The low spitting properties allow low-defect coatings for critical applications.
Unique production capabilities allow us to custom manufacture any required shape and purity in quantities ranging from several grams to hundreds of kilograms. Continuous quality tests and controls with proprietary coating machines allow for a zero failure production process.
Our evaporation materials represent the finest coating materials available today which have been processed or especially developed to meet demanding requirements of scientific experimentation, product and process development or full scale production.
All evaporation materials are supplied with the appropriate Material Safety Data Sheets (MSDS), RoHS-Certificates and Certificate of Analysis (COA), relevant to the lot number supplied.
Our product range comprises more than 60 evaporation materials including special mixtures and substances, as well as fluorides, oxides, sulphides and metals available as granules tablets, or disks.
Please contact us if your required evaporation material is not listed.
The intended function of an optical coating determines the evaporation materials composition and configuration. Design types such as Antireflective coatings (AR), bandpass filter, beam dividing and combined coatings, high reflectors & laser AR coatings, for example, require dielectric materials whose primary characteristic is the absence of significant absorption.
Mirrors that reflect over a wide spectral range are made from highly reflecting evaporation metals with protective and/ or enhancing dielectric multi layers. The chemical categories of the evaporation material that are used for optical coating are segregated by spectral region.
When selecting the best evaporation material for your applications, there are a number of critical factors to consider: the material itself, the form, and the process used to develop it. In perusing available evaporation materials, there are many different routes to the desired film including metals, alloys, inorganic compounds and oxides. There are also less defined items such as intermetallics and interstitial compounds. The producer of metallic materials tends to offer the end-user materials of higher purity and at, or very near, theoretical densities.
In addition to these various compositions of evaporation materials, there is also a large selection of forms to choose froms. Pure metals and most alloys are melted and subsequently swaged (hot or cold) to form rod or wire, or the molten material may be dropped through a sieve to form shot. There are also rods, pellets, tablets, granules, slugs, shaped sources, wire, turnings and a few others.
At its simplest, the choice of the form can be distilled down to ease of degassing of the evaporation material, the length of the coating run and the ability of the evaporation material to form a stable pool or surface for evaporation. The less the surface area (larger particles, wire or shaped charges), the faster the coating engineer can be ready to coat and the more stable the evaporating surface will remain during a run.
Physical vapor deposition processes (PVD-processes) are deposition processes in which an evaporation material is vaporized from a solid source in the form of atoms and is transported in the form of vapour through a vacuum or low pressure (or plasma) environment to the substrate where the vapour condeneses.
PVD-processes can be used to deposit films of elements (evaporation materials) and alloys using reactive deposition processes. Vacuum deposition is a PVD-process in which the evaporation material from a thermal vaporization source reaches the substrate with little or no collision with gas molecules. Vacuum deposition is used to form optical interference coatings, mirror coatings, decorative coatings, electrically conducting films (also TCO films, ITO), wear resistant coatings, and corrosion protective coatings.
