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tech.com
May, 2016
Electroluminescent Wire from NTE Electronics
Bloomfield, NJ — NTE Electronics has expanded its product line further to include a selection of electrolumi- nescent (EL) wire. EL wire, also known as flexible neon wire, is a new generation of product in the lighting and display industry. Unlike flexible LED strips, EL wire is not a series of points, but rather a 360 degree line of unbroken light. Wrapped in a color- ful plastic tube, it appears similar to common telephone wire, and emits light along its entire length, but without any heat radiation. The wire operates at voltages of
90-120VAC, unlike LED strips which use DC. Available in 2.3 and 3.2mm (0.091 and 0.13in) diameters, the wire comes in standard 9.84ft (3m) length with pre-wired connectors. Extremely flexible, EL wire can be bent, knotted, cut, stretched etc., without compro- mising its lighting effect. Also, it can be mounted to almost any decoration surface using transparent adhesive tape, glue or clips. According to the company, its
EL wire uses 50 to 70 percent less en- ergy than LED lamps, 20 to 40 per- cent less than rope lighting, and 1 to 10 percent less than neon lighting.
The wire is available in a variety of colors, including red, blue, transpar- ent blue, green, transparent white, yellow green, and orange. NTE also offers a full line of accessories for the
Highly flexible electroluminescent wire.
wire, such as battery power supplies, 12VDC power supplies, AC power sup- plies, and splitters. Contact: NTE Electronics, Inc.,
44 Farrand Street, Bloomfield, NJ 07003 % 973-748-5089 fax: 973-748- 6224 E-mail:
sales@nteinc.com Web:
www.nteinc.com
See at EDS, Suite B7 Glass-to-Metal Seals Continued from page 6 2/29/16 12:34 PM Page 1
worked best. Dai said they’re not per- fect, but they’re a big step forward. “Basically we see a chemical bond be- tween the glass-ceramic and the met- al, and it’s a very strong bond,” he said. “If we break it, we break the glass.” Sandia also developed a way to
test both whether interfacial bonding is established and, if so, whether it’s strong enough to ensure that the glass won’t break.
Glass Sticking Everywhere Other factors have to be consid-
ered. Without careful processing, the glass sticks to other surfaces as well as to the metal housing. To prevent that, the bonding process uses graphite for the fixtures that hold metal and glass-ceramic pieces while the bond is formed. But graphite, like stainless
100 to 10, VDC Output DC-DC CONVERTERS 000
4 Watt to 10 Watt Series Surface Mount & Plug In Over 250 Standard Models!
Isolated Outputs/Proportional V in and V out Miniature fully encpsulated modules for operation in rugged environment
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www.picoelectronics.com 143 Sparks Ave., Pelham, New York 10803
See PICO’s full line catalog at PICOELECTRONICS, Inc.
Call Toll Free 800-431-1064 • FAX 914-738-8225 E Mail:
info@picoelectronics.com
See at NEPCON China, Booth 1D16
steel, fights for oxygen. “Essentially, that’s a kind of competition thermo- dynamically,” Dai said. “If my metal housing gets that oxygen to form the bond oxide, that’s all I want. If the graphite grabs that oxygen, it doesn’t do any good. That delicate balance of the reaction is very challenging.” The first two years of Dai’s
three-year Laboratory Directed Re- search and Development (LDRD) project centered on the bonding process. The final year studied how to control glass-ceramic crystalliza- tion to ensure the best thermal match. LDRD funding has ended, but the work continues with other funds because of its potential to aid produc- tion. Although the project wasn’t aimed at an immediate application, researchers found a near-term oppor- tunity to help a weapons production team with a better thermal match between glass-ceramic and metal. During sealing, glass-ceramic
goes through a crystallization phase, which allows formation of a high-ex- pansion crystalline phase, increasing the CTE of the glass-ceramic to bet-
ter match high-CTE metals like stainless steel. However, because of the abrupt volume change associated with that crystalline phase, the glass-ceramic expansion is not well distributed over the temperature change that occurs during process- ing. Thus, the rate of thermal strain between the metal and glass-ceramic doesn’t match.
Managing the Crystalline Phase The team was interested in
managing the crystallization process by breaking it to form two or three high-expansion crystalline phases, with the abrupt volume changes in each phase occurring at tempera- tures several hundred degrees apart. The concept requires understanding what temperatures produce certain crystalline phases. “We try to do two or more multi-
ple crystallizations to smooth the ther- mal strain of the glass-ceramic,” Dai said. “As a result, you no longer have this nonlinear, almost step-like strain change in the glass-ceramic. It’s a more near-linear strain curve and matches a lot better to the metals.” Managing multiple crystalliza-
tion phases at very high temperatures is challenging. “We need to learn that part of the process to make sure we have a good balance of all the phases, have them all crystallize in the right sequence and ideally in the right pro- portion,” Dai said. He believes the ef- fort will result in a consistent way to improve hermetic seals. His team is developing verifica-
tion methods to see if the process works for production applications. Then researchers will study whether the process consistently produces the desired results. “Once we reach that point, we will make sure the right specifications are in place and that the processed parts have certain proper- ties so that the production agency can do the process on a continual basis us- ing their equipment,” Dai said. Web:
www.sandia.gov r
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