Electronics Forum: ball fracture (22)

Middle Height Splice

Electronics Forum | Tue Feb 19 11:34:04 EST 2002 | AndyC

Do you mean middle height slice ? . This is a term used to describe the x-ray taken at a mid-ball position on a BGA ball , ie , the "fattest/widest" part if the ball . This is generally done to see if voids contained within have led to fracture acros

BGA opens

Electronics Forum | Tue Nov 10 07:35:04 EST 2009 | scottp

Step 1 is to find out what kind of opens you're getting through a cross-section or die & pry. Are they head in pillow, brittle fracture at the intermetallic, bulk solder cracks, ball separation from interposer? Without some basic failure analysis a

Industry News: ball fracture (1)

6 Things about the Ammonia Refrigeration Compressor Maintenance

Industry News | 2021-08-30 21:24:05.0

In the refrigeration system of the cold storage, the refrigeration compressor is the core equipment. At present, piston refrigeration compressors are mostly used in small and medium-sized cold storage refrigeration systems. Because of the different refrigerating mediums, the compressors are often divided into ammonia type and fluorine type. This article will introduce to you common faults and ideas of piston ammonia refrigeration compressor

OKmarts Industrial Parts Mall

Technical Library: ball fracture (2)

Analysis of Laminate Material Properties for Correlation to Pad Cratering

Technical Library | 2016-10-20 18:13:34.0

Pad cratering failure has emerged due to the transition from traditional SnPb to SnAgCu alloys in soldering of printed circuit assemblies. Pb-free-compatible laminate materials in the printed circuit board tend to fracture under ball grid array pads when subjected to high strain mechanical loads. In this study, two Pb-free-compatible laminates were tested, plus one dicycure non-Pb-free-compatible as control. One set of these samples were as-received and another was subjected to five reflows. It is assumed that mechanical properties of different materials have an influence on the susceptibility of laminates to fracture. However, the pad cratering phenomenon occurs at the layer of resin between the exterior copper and the first glass in the weave. Bulk mechanical properties have not been a good indicator of pad crater susceptibility. In this study, mechanical characterization of hardness and Young’s modulus was carried out in the critical area where pad cratering occurs using nano-indentation at the surface and in a cross-section. The measurements show higher modulus and hardness in the Pb-free compatible laminates than in the dicy-cured laminate. Few changes are seen after reflow – which is known to have an effect -- indicating that these properties do not provide a complete prediction. Measurements of the copper pad showed significant material property changes after reflow.

CALCE Center for Advanced Life Cycle Engineering

Evaluating the Mechanical Reliability of Ball Grid Array (BGA) Flexible Surface-Mount Electronics Packaging under Isothermal Ageing

Technical Library | 2015-02-12 16:57:56.0

Electronic systems are known to be affected by the environmental and mechanical conditions, such as humidity, temperature, thermal shocks and vibration. These adverse environmental operating conditions, with time, could degrade the mechanical efficiency of the system and might lead to catastrophic failures.The aim of this study is to investigate the mechanical integrity of lead-free ball grid array (BGA) solder joints subjected to isothermal ageing at 150°C for up to 1000 hours. Upon ageing at 150°C the Sn-3.5Ag solder alloy initially age-softened for up to 200 hours. This behaviour was linked to the coarsening of grains. When aged beyond 200 hours the shear strength was found to increase up to 400 hours. This age-hardening was correlated with precipitation of hard Ag3Sn particles in Sn matrix. Further ageing resulted in gradual decrease in shear strength. This can be explained as the combined effect of precipitation coarsening and growth of intermetallic layer. The fractured surfaces of the broken solder balls were also investigated under a Scanning Electron Microscope. The shear failures were generally due to ductile fractures in bulk solders irrespective of the ageing time.

School of Engineering, University of Greenwich

Express Newsletter: ball fracture (156)

SMTnet Express - January 27, 2022

SMTnet Express, January 27, 2022, Subscribers: 25,985, Companies: 11,506, Users: 27,032 Fracture Toughness Analysis of Epoxy-Recycled Rubber-Based Composite Reinforced with Graphene Nanoplatelets for Structural Applications

Partner Websites: ball fracture (288)


ball fracture searches for Companies, Equipment, Machines, Suppliers & Information

Sm t t t t t t t t t t net
  1 2 3 4 5 6 7 8 9 10 Next
PCB Handling Machine with CE

Training online, at your facility, or at one of our worldwide training centers"
Blackfox IPC Training & Certification

Nozzles, Feeders, Spare Parts - Siemens, Fuji, Juki, Yamaha, etc...
High Throughput Reflow Oven

Reflow Soldering 101 Training Course
SMT feeders

Stencil Printing 101 Training Course