Topic
Contact area
About: Contact area is a research topic. Over the lifetime, 12358 publications have been published within this topic receiving 256401 citations. The topic is also known as: contact patch & contact region.
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Patent•
31 Oct 1994TL;DR: A nodular metal paste is used to temporarily attach the bumps (34) on a semiconductor die (32) to a substrate (38), and the spherical nodules composing the metal paste are dispensed onto contact pads (40) on the substrate, and then heated until they partially melt.
Abstract: A nodular metal paste (42) is used to temporarily attach the bumps (34) on a semiconductor die (32) to a substrate (38). The spherical nodules (44) composing the metal paste are dispensed onto contact pads (40) on the substrate, and then heated until they partially melt. The partial liquid region permits bonding of the individual metal nodules to the contact pads and to adjacent nodules. Subsequently, a bumped die is placed over the nodules and heated to a minimum temperature required to partially remelt to form a local tack joint. Because the metallurgical contact area between the paste nodules and the bumps is minimized, electrical contact can be sustained with a small cross-sectional area of connected material to create an electrically sound but physically weak link between die and the substrate. Once connected to the substrate, the die may be tested and burned-in, and removed afterwards with little damage to the bumps.
85 citations
TL;DR: In this paper, the authors analyzed the deformation of contact as perity peaks and measured the real area of contact between two smooth surfaces for comparison with the theoretical results, showing that the real surface contact increases with decreasing surface roughness.
85 citations
TL;DR: In this paper, an experimental set-up, made of two coaxial rings in relative motion, a sapphire and steel, enabled temperature measurements on both sides of the third body at the friction interface.
85 citations
TL;DR: In this article, the contact constraints are formulated on a so-called contact domain, which is interpreted as a fictive intermediate region connecting the potential contact surfaces of the deformable bodies.
84 citations
TL;DR: In this paper, an attempt to apply ultrasonic methods to evaluate the real contact area and the contact stiffness is reported, based on measurements of the coefficient of transmission of the longitudinal ultrasonic waves normally incident at the contact interface.
84 citations