3M 8000 Series Thermally Conductive Adhesive Transfer Tapes. These tapes spring from research 3M has conducted in heat sink packaging. "We evaluated typical heat sink configurations," explains Senior Technical Specialist Jeff McCutcheon. "And we found that many have contours and surface features which people are not fully aware of." Some of these features—like a 7-mil hill in one example—are easy not to notice but can significantly decrease the contact between tape and heat sink. Some tests found as little as 20% surface wetout (contact area) in real-world applications. The 8000 Series tapes that come out of 3M's findings have been optimized to provide better contact with heat sinks. According to McCutcheon, these tapes—at 5, 10, 15 and 20 mils—are more conformable. And these tapes have a pure adhesive construction so they have no stiff carrier to interfere with gap filling. The tapes also feature a redesigned adhesive that boosted torque-test (twist-off) strength values by about 50%, he says. For more information, and thermal data for the new tapes, visit www.3m.com/conductives. Enter 582
Tough conditions, easy use
Master Bond Polymer System Supreme10HT/S Epoxy. This electrically conductive, one-component epoxy has been formulated with tough environmental conditions in mind. It tackles service temperatures from cryogenic levels up to 400F and offers enhanced mechanical performance. Lap shear strengths on properly prepared substrates, for example, exceed 1,800 psi, reports Master Bond VP Robert Michaels. At the same time, this silver-filled epoxy meets NASA's low outgassing requirements and has improved chemical resistance, he adds. Supreme 10HT/S has a shelf life of 3 months at ambient temperatures and longer at lower temperatures. Curing typically takes place at 250F for about one hour—though faster curing routines are possible at higher temperatures. A snap-cure version called Supreme 10HTSF cures at 380-400F in less than 2 minutes. (www.masterbond.com) Enter 583
No muss, no fuss
Devcon SC 2000 Series Epoxy. These single-component epoxies—four in all—may be formulated for ease-of-use—but they offer enhanced physical properties too. "One-component systems can be a nice step up for people who want to get away from mixing and not worry about their work time," says David Bongiorni, Devcon's market development manager. "But they also offer slightly better thermal and chemical resistance than comparable two-part epoxies." Capable of withstanding service temperatures from –60 to 300F, these adhesives also hold up under exposure to oils, gasoline, potassium hydroxide solutions, aluminum sulfate solutions, and other chemicals. Self-leveling and curable by a variety of heat sources, these no-mix adhesives offer unlimited working time at room temperature. The SC 2000 Series provides structural bonds on a variety of substrates, including metals, ceramics, and glass. (www.devcon.com) Enter 584
The engineers and inventors of the post WWII period turned their attention to advancements in electronics, communication, and entertainment. Breakthrough inventions range from LEGOs and computer gaming to the integrated circuit and Ethernet -- a range of advancements that have little in common except they changed our lives.
The age of touch could soon come to an end. From smartphones and smartwatches, to home devices, to in-car infotainment systems, touch is no longer the primary user interface. Technology market leaders are driving a migration from touch to voice as a user interface.
Soft starter technology has become a way to mitigate startup stressors by moderating a motor’s voltage supply during the machine start-up phase, slowly ramping it up and effectively adjusting the machine’s load behavior to protect mechanical components.
A new report from the National Institute of Standards and Technology (NIST) makes a start on developing control schemes, process measurements, and modeling and simulation methods for powder bed fusion additive manufacturing.
If you’re developing a product with lots of sensors and no access to the power grid, then you’ll want to take note of a Design News Continuing Education Center class, “Designing Low Power Systems Using Battery and Energy Harvesting Energy Sources."
Focus on Fundamentals consists of 45-minute on-line classes that cover a host of technologies. You learn without leaving the comfort of your desk. All classes are taught by subject-matter experts and all are archived. So if you can't attend live, attend at your convenience.