Active Brazing of Aluminium Oxide Ceramics
Introduction Aluminium Oxide Ceramics is considered as an attractive material in designing of various components when “thermal management issues” are of concern, and Carbon Dioxide is used as a coolant. In our particular case, a specification of the industrial problem can be outlined as following. A system of rectangular grooves (with dimensions of an […]
Brazing of Cemented Tungsten Carbide to DIN 1.2343 Tool Steel
Introduction Although cemented carbide is resistance to thermal shock, it will not withstand stresses caused by severe thermal gradients when brazed to a material such as DIN 1.2343 Tool Steel with a significantly different coefficient of thermal expansion. For comparison, thermal expansion coefficient of the Cemented Tungsten Carbide (e.g. Grade TSM33, 10 wt.% Co) is […]
Brazing and Diffusion Bonding TZM to Graphite Using Cu, Ti, Pd and Cr Filler Metals
Brazing and Diffusion Bonding TZM to Graphite Using Cu, Ti, Pd and Cr Filler Metals M.H. Biglari, A. Miles, H. Schoonderwaldt and A.A. Kodentsov Mat-Tech BV, Ekkersrijt 4302, 5692 DR, Son, The Netherlands Abstract It is demonstrated that joining of Graphite to Mo and TZM alloy can be accomplished below recrystallization temperature of […]
Residueless Soldering with Bi-In
Thermo-mechanical stresses that built up from cool-down after soldering will affect the overall longevity performance of such devices. To mitigate this negative effect, soldering temperature has to be kept as low as possible. Read how this can be done.Residueless Soldering with Bi-In I. Introduction Soldering of highly stress-sensitive electronic devices (e.g. infrared detectors, photodiodes, Si-based […]
The Young-Laplace Equation
The shape of a liquid drop is governed by what is known as the Young-LaPlace equation. It was derived more or less simultaneously by Thomas Young (1804) and Simon Pierre de Laplace (1805). Read here how they did it. I. Introduction The shape of liquid drop is governed by what is known as the Young-LaPlace […]
Young’s Law
The relation between surface tension and contact angles as a measure for the wetting capability is due to Thomas Young (1804). A short derivation is given here. I. Introduction The concept of surface tension and contact angles as a measure for the wetting capability is ascribed to Thomas Young (1804). This led to what we […]
Brazing of Aluminium Alloys with Higher Magnesium Content
One can braze the higher Mg-content heat-treatable AA-6082 series Al alloys, (containing Mg, Si, Fe, Mn, Cr, Zn, Ti), with a near-eutectic Al-Si filler metal using non-corrosive fluxes. I. Introduction Successful brazing of any Al alloy requires prior removal of the native surface oxide film, which is usually done by employing a flux. The flux […]
Diffusion Bonding and Brazing in 3D
This combination of technologies is essential in designing various plate and shell-type heat-exchangers. Application is shown in the joining of two-phase (α+β) Ti-6Al-4V (ASTM Grade 5) alloy parts. I. Introduction Although traditional machining methods of Titanium alloys can generate rather intricate contours and complex shaped parts, fabrication of three-dimensional (3D) components can often be limited […]
TLPB of Tungsten to Copper-Based Precipitation-Hardened Alloys
Transient Liquid Phase Bonding is applied well below the aging temperature (450-480˚C) of the CuCrZr-alloy, whereas the resulting joints will be capable of service at elevated temperatures. I. Introduction Within the International Thermonuclear Experimental Reactor (ITER), one of the most challenging components is the divertor, whose main function is to extract the power from the […]
The Stiffness of a Vertically Loaded Liquid Bump
The stand-off of a flip-chip is governed by the equilibrium between the weight of the chip and the counteracting spring formed by the surface tension of the liquid bump. I. Introduction In a soldering process the assemblies seeks to minimize the amount of free energy. The weight of the chip compresses the spring formed by […]
