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Industry Directory | Manufacturer's Representative
SMT assembly equipment including placement, reflow & vapor phase soldering, cleaning, X-Ray, AOI, SPI, conveyors. First Article Inspection (FAI). Consumables, splicing systems & tools, splice tape & clips. Understencil wiping Roll
New Equipment | Assembly Services
Benefit from our versatility and experience. We manufacture rigid printed circuit boards, rigid-flex and flexible printed circuit boards [including crimp technology]. You`ll find us flexible as far as dimensions are concerned: in addition to standard
Durostone Plates for Reflow Solder Pallet with Long Life Cycle Description Durostone is a fiber-reinforced plastic for mechanical and electrical applications. With good performance against electric arc and tracking, it is an ideal material for solde
Electronics Forum | Mon Oct 03 16:19:22 EDT 2005 | Amol
for backward compatibility applications (such as this), the higher melting temperature alloy (LF alloy) gets the priority in selecting the reflow profile. you are using too low temps for reflow. your LF alloy wont reflow at these temp and you will e
Electronics Forum | Mon May 13 10:37:56 EDT 2002 | fmonette
The other important issue relates to moisture sensitive devices (MSD). If you have MSDs on the first side, you need to track the remaining floor life of the components on the partially assembled boards between the first and second reflow. Contrary to
Used SMT Equipment | Turnkey Lines
Functional Pre-Owned Complete SMT Assembly Line - Still Operational (Subject to prior sell, I am listing this on other venues) Up for sale is a full turnkey SMT line and all of it's accessories, of which there are a lot, fe
Industry News | 2015-07-06 10:34:12.0
The SMTA announces a new feature area that will debut during the SMTA International Electronics Exhibition: the “SMTA - NPL Solder Paste and Solder Joint Automatic Inspection Experience.” This special feature will take place during both days of the SMTA International Exhibition at the Donald Stephens Convention Center in Rosemont, Illinois on September 29 - 30, 2015.
Industry News | 2016-09-07 18:44:03.0
KYZEN announces that Dr. Mike Bixenman will present the recent paper entitled, “Reactivity of No-Clean Flux Residues Trapped Under Bottom Terminated Components” during SMTA International. The paper is co-authored by Bruno Tolla, Ph.D., Jennifer Allen and Kyle Loomis from Kester and will be presented during the “Flux, Solder, Adhesives Track” on Tuesday, September 27, 2016 at 3 p.m.
Technical Library | 2020-09-23 21:37:25.0
The need to minimise thermal damage to components and laminates, to reduce warpage-induced defects to BGA packages, and to save energy, is driving the electronics industry towards lower process temperatures. For soldering processes the only way that temperatures can be substantially reduced is by using solders with lower melting points. Because of constraints of toxicity, cost and performance, the number of alloys that can be used for electronics assembly is limited and the best prospects appear to be those based around the eutectic in the Bi-Sn system, which has a melting point of about 139°C. Experience so far indicates that such Bi-Sn alloys do not have the mechanical properties and microstructural stability necessary to deliver the reliability required for the mounting of BGA packages. Options for improving mechanical properties with alloying additions that do not also push the process temperature back over 200°C are limited. An alternative approach that maintains a low process temperature is to form a hybrid joint with a conventional solder ball reflowed with a Bi-Sn alloy paste. During reflow there is mixing of the ball and paste alloys but it has been found that to achieve the best reliability a proportion of the ball alloy has to be retained in the joint, particular in the part of the joint that is subjected to maximum shear stress in service, which is usually the area near the component side. The challenge is then to find a reproducible method for controlling the fraction of the joint thickness that remains as the original solder ball alloy. Empirical evidence indicates that for a particular combination of ball and paste alloys and reflow temperature the extent to which the ball alloy is consumed by mixing with the paste alloy is dependent on the volume of paste deposited on the pad. If this promising method of achieving lower process temperatures is to be implemented in mass production without compromising reliability it would be necessary to have a method of ensuring the optimum proportion of ball alloy left in the joint after reflow can be consistently maintained. In this paper the author explains how the volume of low melting point alloy paste that delivers the optimum proportion of retained ball alloy for a particular reflow temperature can be determined by reference to the phase diagrams of the ball and paste alloys. The example presented is based on the equilibrium phase diagram of the binary Bi-Sn system but the method could be applied to any combination of ball and paste alloys for which at least a partial phase diagram is available or could be easily determined.
SMTnet Express, December 29, 2016, Subscribers: 30,326, Companies: 15,062, Users: 41,660 Partially-Activated Flux Residue Impacts on Electronic Assembly Reliabilities Yanrong Shi, Ph.D., Kyle Loomis, Jennifer Allen, Bruno Tolla, Ph.D.; Kester
Heller Industries Inc. | https://hellerindustries.com/low-void-curing/
(Henry’s Law) Henry’s Law – The amount of dissolved gas in a liquid is proportional to its partial pressure above the liquid. Increasing pressure during the curing process removes voids
Surface Mount Technology Association (SMTA) | https://www.smta.org/msd/msd.cfm
components are placed prior to reflow. This basic material and process control becomes very difficult to follow in a high mix production environment, when partial trays and reels are often removed and re-loaded from assembly lines to be
