 |
 | Home | Contact Us | FAQ | Search & Site Map | Link to Us |
 | Sign In | Join | Other 45 Sites in Network |
Natural Science Forum / Physics / Acoustics / August 2007Conductive epoxy sources
I'm looking for sources of conductive epoxy to be used in the manufacture of power transducers. Have used impregnated mesh style that must be kept very cold before heat cure, and two part epoxy. These are silver filled. Most have higher conductivity than needed (more silver). Looking for very thin bonds and low loss. Thanks, Mike > I'm looking for sources of conductive epoxy to be used in the manufacture of > power transducers. > Have used impregnated mesh style that must be kept very cold before heat > cure, and two part epoxy. These are silver filled. Most have higher conductivity > than needed (more silver). Looking for very thin bonds and low loss. Suggest you mix your own. Look for conducting powders of the finest grain size.. Talk to paint companies.. When I was young, "Bronze" paint was made by the painter from fine bronze powder almost dust-like, mixed into varnish.. It could raise a broze cloud of haze by dropping it from soem height (kid's fun). Aluminum seemed similar then to me. Angelo Campanella >> I'm looking for sources of conductive epoxy to be used in the manufacture >> of [quoted text clipped - 11 lines] > > Angelo Campanella Interesting idea, I'll look into that. Any ideas on getting a very thin bond? We have used a spinner to spread the glue with some success. Thanks, Mike >>> I'm looking for sources of conductive epoxy to be used in the manufacture >>> of [quoted text clipped - 16 lines] > Thanks, > Mike What is your substrate? Fired on silver usually requires temps of 600-900°C, but it sticks well to ceramic. I haven't found a conductive epoxy that withstands the temperatures and forces encountered in a high power transducer, so I'd love to hear about it if you find one.  SignatureDave dvt at psu dot edu Everyone confesses that exertion which brings out all the powers of body and mind is the best thing for us; but most people do all they can to get rid of it, and as a general rule nobody does much more than circumstances drive them to do. -Harriet Beecher Stowe, abolitionist and novelist (1811-1896) >>> I'm looking for sources of conductive epoxy to be used in the manufacture >>> of [quoted text clipped - 15 lines] >Any ideas on getting a very thin bond? We have used a spinner to spread >the glue with some success. Conductive thermally I guess. I have used diamond dust with regular thermal epoxy. Diamond being the best conductor of heat plus its insulating qualities enables very thin coatings. greg >>>> I'm looking for sources of conductive epoxy to be used in the manufacture >>>> of [quoted text clipped - 19 lines] >epoxy. Diamond being the best conductor of heat plus its insulating qualities >enables very thin coatings. there was a company making the "best" thermal epoxy using some kind of carbon rods, or something like that. greg >>>>> I'm looking for sources of conductive epoxy to be used in the manufacture >>>>> of [quoted text clipped - 22 lines] >there was a company making the "best" thermal epoxy using some kind of carbon >rods, or something like that. Probably too expensive, but there is a company who makes diamond wafers specifically for electronics. greg >>>> I'm looking for sources of conductive epoxy to be used in the >>>> manufacture [quoted text clipped - 27 lines] > > greg Hi greg, No, the epoxy needs to be electrically conductive, but thermal conductivity is a plus. > No, the epoxy needs to be electrically conductive, but thermal > conductivity is a plus. Clearly, the two (thermal and electrical) need to be clerly delineated in any choice of cement. Agreed that diamond is a good heat conducting material. Itscapability as an electrical isulator is clear. In the case of transducers, one may or may not need electrical conductivity. SO the admixture has to be concocted accordingly. Old transducer makers have their favorites, perhaps even as trade secrets. In any eveny, insulator additives seem to be better know than electrical conducting additives. Acoustic-mechanical connection has in days gone been accomplished via soldering or firmly bolting or clamping a "stack" together. I have often seen indium solder mentioned in this regard. Indium will melt at a temperature that may below the curie temperature of some piezoectrica. The polarzation could then be restablished at a temperature that is below the meleting point of Indium. I do not know the exact facts. Is it that Indium melts below the temperature which can permanently diable the piezoeldtric properties of a transducer? What ARE the facts? Angelo Campane;;a >I'm looking for sources of conductive epoxy to be used in the manufacture of >power transducers. [quoted text clipped - 4 lines] >needed (more silver). Looking for very thin bonds and low loss. > Thanks, Mike I've been pleased with the products these guys make. http://www.miller-stephenson.com/ >>I'm looking for sources of conductive epoxy to be used in the manufacture of >>power transducers. Have used impregnated mesh style that must be kept [quoted text clipped - 3 lines] > I've been pleased with the products these guys make. > http://www.miller-stephenson.com/ They show in this regard only an adhesive, which means that the conductor additive still needs to be inserted. Two-component systems help in this regard since the metal poweder can be added just into one component. Ang. C. |
Reply to this Message |
 Sign In
 Join
 My Latest Posts My Monitored Threads My Blog My Photo Gallery My Profile My Homepage Start New Thread Enable EMail Alerts Rate this Thread
|
©2009 Advenet LLC Privacy Policy - Terms of Use
This website includes both content owned or controlled by Advenet as well as content owned or controlled by third parties.