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The continuous miniaturization of products and the growing complexity of their embedded multifunctionalities necessitates continuous research and development efforts regarding micro components and related micro manufacturing technologies. Highly miniaturized systems, manufactured using a wide variety of materials, have found application in key technological fields, such as healthcare devices, micro implants, mobility, communications, optics, and micro electromechanical systems. Innovations required for the high-precision manufacturing of micro components can specifically be achieved through optimizations using post-process (i.e., offline) and in-process (i.e., online) metrology of both process input and output parameters, as well as geometrical features of the produced micro parts. However, it is of critical importance to reduce the metrology and optimization efforts, since process and product quality control can represent a significant portion of the total production time in micro manufacturing. To solve this fundamental challenge, research efforts have been undertaken in order to define, investigate, implement, and validate the so-called “product/process manufacturing fingerprint” concept. The “product manufacturing fingerprint” concept refers to those unique dimensional outcomes (e.g., surface topography, form error, critical dimensions, etc.) on the produced component that, if kept under control and within specifications, ensure that the entire micro component complies to its specifications. The “process manufacturing fingerprint” is a specific process parameter or feature to be monitored and controlled, in order to maintain the manufacture of products within the specified tolerances. By integrating both product and process manufacturing fingerprint concepts, the metrology and optimization efforts are highly reduced. Therefore, the quality of the micro products increases, with an obvious improvement in production yield. Accordingly, this Special Issue seeks to showcase research papers, short communications, and review articles that focus on novel methodological developments and applications in micro- and sub-micro-scale manufacturing, process monitoring and control, as well as micro and sub-micro product quality assurance. Focus will be on micro manufacturing process chains and their micro product/process fingerprint, towards full process optimization and zero-defect micro manufacturing.

n/a --- Fresnel lenses --- Electro sinter forging --- micro-injection moulding --- surface roughness --- charge relaxation time --- optimization --- gratings --- plasma-electrolytic polishing --- micro structures replication --- micro-grinding --- electrical discharge machining --- injection molding --- quality control --- commercial control hardware --- electrical current --- damping --- process monitoring --- fingerprints --- impact analysis --- current monitoring --- process control --- quality assurance --- surface integrity --- microfabrication --- microinjection moulding --- electro chemical machining --- superhydrophobic surface --- surface modification --- haptic actuator --- electrical discharge machining (EDM) --- surface morphology --- inline metrology --- optical quality control --- finishing --- flow length --- precision injection molding --- laser ablation --- micro metrology --- Halbach linear motor --- 2-step analysis --- computer holography --- PeP --- satellite drop --- process fingerprint --- materials characterisation --- current density --- micro drilling --- multi-spectral imaging --- lithography --- manufacturing signature --- artificial compound eye --- electrohydrodynamic jet printing --- ECM --- positioning platform --- diffractive optics --- bioceramics --- resistance sintering --- uncertainty budget --- product fingerprint --- confocal microscopy --- spectral splitting --- dental implant --- desirability function --- injection compression molding --- electrochemical machining (ECM) --- high strain rate effect --- process fingerprints

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This book gathers several manuscripts dealing with powder metallurgy processing. Both powders production and their processing to reach a final product can be found. In particular, the extraction of Ta and Ti powders from their oxides by the action of Mg is studied. Moreover, the synthesis of ball-milled Mn-Bi powder for magnetic uses is also presented in the book. Regarding powders processing, sintering of Fe-Co-Cu powder mixtures for their use as diamond impregnated tools, electrical resistance sintering of mechanically alloyed amorphous Al-Ti powders, cold pressed Fe-Si-B alloys with magnetic uses, hot extruded functionally graded Al-based materials, space holder sintering of Ti for medical implants, sintering of hard Co-based material, and electrical resistance sintering of Fe-WC hardmetals can be found in this book.

electrical resistance sintering --- hardmetal --- ultrafine grain --- titanium powder --- self-propagating high-temperature synthesis --- acid leaching --- magnesium --- magnesium oxide --- tantalum powder --- magnesium reduction --- Ta2O5 powder --- MgO --- HCl solution --- functionally graded materials (FGMs) --- aluminum alloy --- hot extrusion --- Hall–Petch equation --- Kelly–Tyson equation --- amorphous powders --- amorphous magnetic powder cores --- soft magnetic properties --- permeability --- direct current (DC) bias performance --- Mn55Bi45 powders --- low-energy ball milling --- surfactant --- particle size --- coercivity --- microstructure --- magnetic properties --- cobalt-based alloy --- mechanical alloying --- hot pressed sintering --- bone implant --- porous titanium --- cellular adhesion --- bacteria colonization --- osseointegration --- amorphisation --- crystallisation --- Al-Ti powders --- porosity --- hardness --- pre-alloyed agglomerates --- mechanical properties --- cutting performance --- diamond impregnated tools --- stone machining --- tool wear --- n/a --- Hall-Petch equation --- Kelly-Tyson equation --- Engineering --- Technology --- History.