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Leszek Adam Dobrzanski, Hon. He is one of the 55 most frequently cited contemporary Polish scientists of all disciplines.
He is the vice president and a fellow of the Academy of Engineers in Poland. He advised 60 finished PhD degree theses and ca.
Leszek A. Dobrzański
And, he has also won ca. The book presents the fundamentals and the role of powder metallurgy in contemporary technologies and the state of the art of classical powder metallurgy dobbrzanski and a general description of new variants and special and hybrid technologies used in powder metallurgy.
The next leezek includes over a dozen case studies provided in the following chapters, comprehensively describing authors’ accomplishments of numerous teams from different countries across the world in advanced research areas relating to powder metallurgy and to special and hybrid technologies. Edited by Leszek A. Part of the book: Advances in Diverse Industrial Applications of Nanocomposites.
This chapter is an introduction to the book on powder metallurgy PM. It presents the basis of the selection of powder metallurgy technologies for manufacturing of products, including such applied in medicine and dentistry, and the state of the art concerning the general characteristic of powder metallurgy.
The materials and products manufactured with the classical powder metallurgy methods are generally described. The dobrzabski section presents the general contents of the book based on the above general information.
Leszek A. Dobrzanski – Google Scholar Citations
This chapter presents essential information concerning sintered tool materials containing carbides, i. Gradient materials, whose properties change gradually according to their volume, are characterised. The results of investigations are presented in the final part into the structure and properties of newly developed sintered graded tool materials fabricated by the conventional metallurgy method from a mixture of high-speed HS steel powder and WC carbides.
Investigations are described for four-layer materials, where the successive transition layers with a smaller and smaller volume fraction of tungsten carbide were constituted from the dobrzamski layer side, until a substrate layer containing high-speed HS steel only.
The outcomes are described of structural examinations in a scanning and transmission electron microscope, an X-ray microanalysis and the results of density, porosity and hardness examinations of sintered gradient materials and the results of structure and hardness examinations of heat-treated materials.
This chapter of the book presents the basis of classical powder metallurgy technologies and discusses powder fabrication, preparation, preliminary moulding, sintering and finish treatment operations. A general fobrzanski of the materials and products manufactured with the classical powder metallurgy methods is presented. New variants are characterised along with special and hybrid technologies finding their applications in powder metallurgy. Laser deposition, thermal spraying dkbrzanski detonation spraying of powders are also discussed as special methods in which powders of metals and other materials are used as raw materials.
This chapter characterises scaffolds manufactured in line with the make-to-order concept according to individual needs of each patient.
The created scaffold is characterised by good mechanical properties, which is confirmed by the results of the performed tensile and compressive strength tests. The material is additionally subjected to surface treatment consisting of the deposition of lesxek layers of titanium dioxide with nanometric thickness.
This chapter presents a general characteristic of sintered tool materials, in particular sintered sialons, nitride ceramics, injection-moulded ceramic-metallic tool ledzek and cemented carbides and a general characteristic of their surface treatment technology and especially chemical vapour deposition CVD and physical vapour deposition PVD techniques.
The results of our investigations in technology foresight methods concerning the development prospects of surface engineering of sintered tool dobrzansii are presented. In the next subsection, we discuss the outcomes of multifaceted research carried out with advanced materials dobezanski methods, including high-resolution transmission electron dobgzanski, into the structure and properties of multicomponent, graded and multilayer coatings on the investigated tool materials, including the newly developed injection moulded ceramic-metallic tool materials.
Special attention was drawn to a one-dimensional structure of the studied PVD and CVD coatings and its impact on the properties of coatings. The infiltration technology with reinforcement in the form of porous skeletons fabricated with powder metallurgy methods has been presented in relation to the general characteristics of metal alloy matrix composite materials.
The results of our own investigations are presented pertaining to four alternative technologies of fabrication of porous, sintered skeletons, and their structure and their key technological properties are presented. Porous skeletons made of Al2O3 aluminium are sintered reactively using blowing agents or are manufactured by ceramic injection moulding CIM from powder. Titanium porous skeletons are achieved by selective laser sintering SLS.
A unique structure of the achieved composite materials, together with good mechanical properties and abrasive wear resistance at low density, ensured by an aluminium alloy matrix, are indicating broad application possibilities of such composites. In this chapter, the characterisation of the halloysite nanotubes HNTs and multiwalled carbon nanotubes MWCNTs as the reinforcement in the composite materials was described.
Advanced Nanoengineering Materials
The original and author technology of production of the aluminium AlMg1SiCu matrix composite materials reinforced with halloysite or carbon nanotubes using powder metallurgy techniques, including mechanical alloying and hot extrusion and the range of dobrzanaki research in the case to determine microstructure, as well as mechanical properties of those materials was present.
It was investigated that the addition of carbon and halloysite nanotubes causes a significant improvement in mechanical properties of the obtained nanocomposites. The investigation results show that the technology used in manufacturing nanocomposite materials can find the practical application in the production of new light metal matrix nanocomposites.
As modern manufacturing methods have been developing, the application methods of powders have changed, and they do not always have to be moulded prior to sintering.
The powder injection moulding PIM method is suitable for large-lot and mass production; still, powder consumption is not too high.
The metal injection moulding MIM is an advanced technology and not as dobrzwnski as classical pressing and sintering but constantly and dynamically developing. The technology is developing towards micro-MIM, that is, production of very small parts for miniaturised devices. The chapter presents the overview of powder injection moulding as specialist powder metallurgy method and its application for fabrication of tool materials.
Specially, the fabrication of high-speed steels and carbide-steels on their matrix by powder injection moulding is descripted.
Prof. Leszek Adam Dobrzański
In last part of the chapter, the results of own investigations of the structure with nanostructural elements of high-speed steels and carbide-steels on their matrix fabricated by powder injection moulding are presented.
Latest work with IntechOpen by Leszek A. Go to the book.