Diffusion Bonding in 3D-Manufacturing of Titanium Alloy Structures
I. Introduction II. Specification of the industrial problem Fig. 1: Optical images (“top view”) of the initial Ti-6Al-4V alloy parts. III. Direct low-pressure diffusion bonding of Ti-6Al-4V (ASTM Grade 5) alloys Fig. 2: Cross-sectional view (Back-scattered Electron Image) of the Ti-6Al-4VTi-6Al-4V samplediffusion bonded in vacuum at 960 C for 2 hours and external pressure 0.6 […]
Brazing of Aluminium Alloys with High-Magnesium content
ABSTRACT Successful brazing of any Aluminium alloy requires prior removal of the native surface oxide film,which is usually done by employing a flux. Magnesium additions in Aluminium-alloys, althoughhelpful in achieving stronger material, lead to a decrease in brazeability. During the brazing cycleMagnesium deteriorates oxide removal and Al-alloys with a Mg-level only up to 0.5 % […]
Brazing of refractory metals and AISI 304 stainless steel to Copper – The use of
ABSTRACT Brazing of several refractory metals, namely, Tungsten, Molybdenum and Niobium as wellas austenitic stainless steel AISI 304 to pure Copper was performed in vacuum using CuGe10 filleralloy. Interface between refractory metal and brazing seam in the W/Cu and Mo/Cu joints fabricatedat 1060 ºC using CuGe10 alloy is found to be sound and no intermetallic […]
Joining of Zirconia Ceramics to AISI 316L Stainless Steel
I. Specification of the problem The present Project is dealing with the fabrication of electrical (high-voltage) feedthrough consisting of YSZ (ZrO2 + 3 % mole Y2O3) body (insert) with fifteen (15) Pt-Pd pins (contacts) positioned inside the stainless steel (AISI 316L) holder. In Fig. 1, drawings of the electrical feedthrough assembly (“first version”) together with […]
Brazing of Aluminium Oxide Ceramics is an important step in manufacturing of the CO2-cooled substrate
I. Introduction Aluminium Oxide Ceramics due primarily to its good heat conductivity (of about 30 W×m-1×K-1) and a relatively low cost is considered as an attractive material in designing of various components when “thermal management issues” are of concern. The high thermal conductivity of the Alumina combined with large surface area of the substrates result […]
High-temperature soldering of P- and N-Legs to the Copper connector in thermoelectric convertor assembling
I. Introduction Our previous investigation of the interfacial regions in the ”(p-n) thermocouple” / Cu- connector assembly (Project No. 2012-3067-0616) was aimed at providing a framework for the development of long-lasting joints between the thermoelectric materials and couple interconnects. The most salient features of the “Thermoelectric Convertor” design discovered in this study are as follows: […]
Metallography and microstructure of the Cu-brazed P265GH-steel joints
I. Introduction Composition (in weight %) of the low-carbon, low-alloy P265GH-(“killed”) steel is C0.2; Si0.4; Mn 0.8-1.4; P0.025; S0.015; N0.012; Cu0.3; Mo0.08; Ni0.3; Cr0.3; V0.02; Nb0.2; Ti0.03. It is to be emphasized that chemical composition shown here corresponds to the maximum element content found in the specification for the P265GH-steel (Material No. 1.0425, according to […]
Interfacial region of the ” (p-n) thermocouple” / Cu connector in the thermoelectric convertor
I. Introduction The continued demand for reliable sources of energy can be addressed by the discovery of new sustainable energy sources as well as increasing the efficiency of power generation technology. Thermoelectric materials are one approach towards alternative energy.Thermoelectric materials comprise a wide range of solid compounds distinguished by their ability to convert thermal and […]
Brazing of Cemented Tungsten Carbide to DIN 1.2343 Tool Steel
I. 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) […]
Brazing of Aluminium Oxide Ceramics is an important step in manufacturing of the CO2-cooled substrate
Introduction Aluminium Oxide Ceramics due primarily to its good heat conductivity (of about 30 W´m-1´K-1) and a relatively low cost is considered as an attractive material in designing of various components when “thermal management issues” are of concern. The high thermal conductivity of the Alumina combined with large surface area of the substrates result in […]
