PRODUCT INFORMATION Boats Filaments Crucibles Crucible Heaters Box Sources Gas Purifiers Low Voltage Power Supplies

---

Filaments

The R. D. Mathis Company offers a comprehensive selection of tungsten metalizing filaments to fit your thin film coating needs. Choose from tungsten coiled filaments, tungsten rod sources, point source loop filaments, heater filaments or baskets (see pages 1 through 6 of our catalog). Most catalog parts are offered in single strand or multiple strand tungsten wire configurations with varying wire diameters.

Our flexible tooling and manufacturing techniques allow us to offer modifications to any of our standard parts or create custom parts to fit your specific coating requirements. Large production or small custom orders are produced with equal ease while attention to detail and customer specifications are rigidly adhered to. Engineering consultation is available to provide innovative and creative solutions to your difficult "source" problems.

We fabricate electron beam filaments to your specifications. Tungsten, molybdenum and tantalum wire cut to size is available on request.

Call or fax so we can quote on your next filament needs.

---

Boats

Evaporation S/B boat sources are ideal solutions to many thin film coating processes. In our catalog you will find an extensive selection of tungsten, molybdenum and tantalum boat sources to fit your coating needs (see pages 12 through 22 of our catalog). Capacities range from .1cc to over 5cc and can be used for low temperature as well as higher temperature evaporation materials. Most boat sources are offered in material thicknesses from .005" to .020" to fit your specific requirements.

Alumina Coated Evaporation Sources - The R. D. Mathis Company offers alumina coated sources for some specific coating applications. The advantages of this type of source is good thermal transfer and the inertness of alumina with most metals. Also, the evaporant does not wet the alumina which eliminates resistance changes in the boat when the evaporant melts. Due to the non wetting characteristics the evaporant forms a sphere when melted resulting in "point source" performance. The alumina coated source also provides longer life compared to the unprotected source.

Give us a call or fax us a sketch of your boat source requirements and we'll be happy to fax you a competitive quotation.

---

Crucibles

In many coating applications crucibles offer unique advantages to other types of sources. Larger capacities, easy loading and improved directional vapor patterns are just a few benefits. We offer a wide selection of quartz, alumina, boron nitride, carbon, molybdenum and tantalum crucibles in various sizes (see pages 8 & 9 of our catalog). Custom crucible sizes are available in most materials as well as crucibles to fit your electron beam gun.

Let us provide you with a quotation for your next crucible requirement.

---

Crucible Heaters

If your thin film coating application requires the use of a crucible, then selecting the correct crucible heater can be just as important as the crucible itself. We offer tungsten basket heaters as well as shielded and double shielded crucible heaters (see pages 7, 10 & 11 of our catalog).

Our tungsten basket heaters provide an economical way to heat most crucibles using low amperage. The shielded and double shielded crucible heaters are uniquely designed to increase thermal efficiency and allow you to reach higher, more uniform temperatures up to 1800°C. Heater life is increased, crucible fracture is reduced and your vacuum system is protected from excessive heat radiation.

Modified and custom crucibles and crucible heaters can be fabricated to meet your needs.

Call us so we can discuss the right crucible and crucible heater for your application.

---

Box Sources

The R. D. Mathis Company offers box sources that fit nearly any evaporation need. Open box sources as well as covered box sources are available in tungsten, molybdenum and tantalum materials and various thicknesses (see pages 28 through 34 of our catalog). Materials such as silicon monoxide and zinc sulphide have a tendency of "spitting" and "spalling" during evaporation. This can cause "pinholes" and other defects in your coating process. Our shielded and baffled box sources eliminate particulates from the vapor stream of these materials and therefore reduce defects. We offer large and small baffled box sources as well as custom designs that meet your requirements.

Let us know if you think one of our baffled box sources will help reduce your defects.

---

Low Voltage Power Supplies

The "LV Series" power supplies are low voltage, high current AC and uniquely designed for thermal evaporation. The power supply's primary use in the thin film industry is supplying power to resistive evaporation sources. The low voltage, high current AC power supplies were designed to meet a growing need for versatility and reliability in the industry. Both units incorporate a hand held remote control that displays amperage and voltage outputs while allowing an operator more freedom to move closer to the viewing port or the monitoring instrumentation. The low voltage, high current tap switch enables voltage range changes with ease and without having to relocate bulky cables. The units are SCR controlled and can receive up to 4 different type input signals to operate in a semi-automatic mode. The current limiting, soft start and interlock switches make these units extremely user friendly and easy to operate. Available in either 4KW (800 amps @ 5volts) or 7.5KW (1,500 amps @ 5 volts), the conservative power ratings allow the units to run cool, while rugged construction and quality components make them reliable.

We also offer 250amp and 500amp welding cables, cut to size, with a variety of terminal lugs (installed) to complete your power set-up.

Just call for more information or if you have technical questions about our "LV Series" power supplies or accessories.

---

Gas Purifier

Our "GP100" model gas purifier has been designed to fill the needs of research and development engineers and scientists as well as production staff to provide a lightweight, compact, low cost inert gas purification system. This unit operates off of standard cylinder gas to purify inert gases to ultra high purity levels and avoids the problem of cylinder walls outgassing during storage. This unit can be placed in operation in less than 1 hour, simply by connecting the inlet and outlet fittings and 110vac (or 220vac) electrical connection.

The "GP100" has been shown to purify 99.8% argon gas to 99.9991% purity as part of a worst case test. Available literature indicates that starting with a high purity gas and using all stainless steel fittings, impurity levels as low as 10p.p.m. in oxygen can be obtained. While the unit was designed primarily for argon gas, it may be used for helium, xenon and neon.

Applications for the unit include purification of gases for sputtering modules, crystal growth furnaces and glove boxes. A paper on "The Purification of Inert Gases", discussing a variety of inert gases is available upon request.

If you would like to find out more about our model "GP100" Inert Gas Purifier just give us a call and we will be happy to send you more literature.