Maciej Ossowski - Academia.edu (original) (raw)
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Papers by Maciej Ossowski
The tubular boom is a generic technology of deployable structures for space applications, which m... more The tubular boom is a generic technology of deployable structures for space applications, which may be adapted to fit many missions and instruments. An advantage of such technology is small volume and mass of such mechanisms due to using tensioned tapes, not standard tubes. In stowed configuration of the boom, the tape is stored on a reel, during deployment it is unwounded from the storage reel and changes its shape into a tubular boom. Depending on the material type and dimensions of the tape, such boom can reach the length of up to 5 m. The application of such technology often depends on the boom material: stainless steel is usually used for manipulators, CFRP composites for large structural booms, while copper alloys seem perfect for miniature booms and antennas. All of these tubular boom applications need to fulfil almost identical conditions in order to ensure their correct and reliable operation. Astronika company has a great experience in a tubular boom technology and is a ma...
This paper provides a description of the specific design features and nuances of the Hammering Me... more This paper provides a description of the specific design features and nuances of the Hammering Mechanism, a drive unit for the HP3 mole-type penetrator for NASA’s InSight mission. State of the art for this type of mechanism and an overall system overview are provided. Particular attention is focused on key components of the system that make it an effective mechanism. The main design changes introduced to the mechanism are related to three main domains: mechanism architecture and principles, increase of efficiency and simplification of the design, and functionality. A few critical lessons learnt are also described.
Glow discharge nitriding is being used increasingly more often for modifying the properties of ti... more Glow discharge nitriding is being used increasingly more often for modifying the properties of titanium and its alloys with the aim to increase their frictional wear resistance, fatigue strength, and, in the case of medical applications, to eliminate the metallosis effect. Unlike PVD methods, ion nitriding ensures the formation of diffusive layers with very good adhesion to the substrate, but which still have some disadvanteges such as the “edge effect” or “hollow cathode effect” which hinders treatment of complex workpieces. The paper compares nitrided layers produced on Ti6Al4V alloy using two different types of nitriding processes. The first process is conventional dc plasma nitriding (DCPN) where the samples were placed at the cathode potential, while the second one is a new method of cathodic cage plasma nitriding (CCPN) process, where the substrate is insulated from the cathode and anode. The experiments have shown that the treatment conducted in a cathodic cage can be alterna...
Materials Science, 2016
In most cases, machine components, which come in contact with each other, are made of steel. Comm... more In most cases, machine components, which come in contact with each other, are made of steel. Common steel types include 100Cr6 and X105CrMo17 are widely used in rolling bearings, which are subjected to high static loads. However, more and more sophisticated structural applications require increasingly better performance from steel. The most popular methods for improving the properties of steel is carburisation or nitriding. Unfortunately, when very high surface properties of steel are required, this treatment may be insufficient. Improvement of tribological properties can be achieved by increasing the hardness of the surface, reducing roughness or reducing the coefficient of friction. The formation of composite layers on steel, consisting of a hard nitride diffusion layer and an external carbon coating with a low coefficient of friction, seems to be a prospect with significant potential. The article describes composite layers produced on X105CrMo17 steel and defines their morphology, surface roughness and their functional properties such as: resistance to friction-induced wear, coefficient of friction and corrosion resistance. The layers have been formed at a temperature of 370°C in successive processes of: nitriding in low-temperature plasma followed by deposition of a carbon coating under DC glow-discharge conditions. An evaluation was also made of the impact of the nitrided layers on the properties and morphology of the carbon coatings formed by comparing them to coatings formed on non-nitrided X105CrMo17 steel substrates. A study of the surface topography, adhesion, resistance to friction-induced wear and corrosion shows the significant importance of the substrate type the carbon coatings are formed on.
Materials Science, 2016
Glow discharge nitriding is being used increasingly more often for modifying the properties of ti... more Glow discharge nitriding is being used increasingly more often for modifying the properties of titanium and its alloys with the aim to increase their frictional wear resistance, fatigue strength, and, in the case of medical applications, to eliminate the metallosis effect. Unlike PVD methods, ion nitriding ensures the formation of diffusive layers with very good adhesion to the substrate, but which still have some disadvanteges such as the "edge effect" or "hollow cathode effect" which hinders treatment of complex workpieces. The paper compares nitrided layers produced on Ti6Al4V alloy using two different types of nitriding processes. The first process is conventional dc plasma nitriding (DCPN) where the samples were placed at the cathode potential, while the second one is a new method of cathodic cage plasma nitriding (CCPN) process, where the substrate is insulated from the cathode and anode. The experiments have shown that the treatment conducted in a cathodic cage can be alternative for conventional ion nitriding, especially when used for small parts with complicated shapes used in the space or medical industry.
European cells & materials
The original extracorporeal pulsatile heart support device, called POLVAD, has been developed in ... more The original extracorporeal pulsatile heart support device, called POLVAD, has been developed in Poland. It was used in over 200 patients with the longest duration exceeding 6 months. The innovative tilting disc valve for this device is developing. The valve consists of original valve ring, free of pivot element crossing the blood stream. The ring is made of Titanium alloy with surface modified by different surface treatment to obtain the lowest thrombogenicity.
Szybki rozwój techniki stwarza konieczność zwiększania wymagań stawianych materiałom w zakresie w... more Szybki rozwój techniki stwarza konieczność zwiększania wymagań stawianych materiałom w zakresie właściwości mechanicznych, oddziaływania korozyjno-erozyjnego czy też odporności na wysokie temperatury itp. Spełnienie tych warunków jest możliwe poprzez wykorzystanie metod inżynierii powierzchni, które umożliwiają kształtowanie struktury, składu fazowego i chemicznego warstw wierzchnich obrabianych materiałów, a więc ich właściwości. Poprzez połączenie procesów utleniania jarzeniowego, osadzania powłok aluminium (stopów Al) metodą rozpylania magnetronowego oraz procesu zgrzewania dyfuzyjnego wytwarzane są materiały gradientowe. Jest to kompozyt warstwowy w układzie: stop tytanu Ti6Al2Cr2Mo/fazy międzymetaliczne Ti-Al/stop tytanu Ti6Al2Cr2Mo (również wielokrotność tego układu) z wytworzoną dyfuzyjną warstwą typu Al2O3+TiAl3+TiAl+Ti3Al. Są to nowe materiały kompozytowe, które charakteryzują się niższą gęstością niż stopy tytanu i dobrą odpornością na zużycie przez tarcie (rys. 5) i koroz...
The tubular boom is a generic technology of deployable structures for space applications, which m... more The tubular boom is a generic technology of deployable structures for space applications, which may be adapted to fit many missions and instruments. An advantage of such technology is small volume and mass of such mechanisms due to using tensioned tapes, not standard tubes. In stowed configuration of the boom, the tape is stored on a reel, during deployment it is unwounded from the storage reel and changes its shape into a tubular boom. Depending on the material type and dimensions of the tape, such boom can reach the length of up to 5 m. The application of such technology often depends on the boom material: stainless steel is usually used for manipulators, CFRP composites for large structural booms, while copper alloys seem perfect for miniature booms and antennas. All of these tubular boom applications need to fulfil almost identical conditions in order to ensure their correct and reliable operation. Astronika company has a great experience in a tubular boom technology and is a ma...
This paper provides a description of the specific design features and nuances of the Hammering Me... more This paper provides a description of the specific design features and nuances of the Hammering Mechanism, a drive unit for the HP3 mole-type penetrator for NASA’s InSight mission. State of the art for this type of mechanism and an overall system overview are provided. Particular attention is focused on key components of the system that make it an effective mechanism. The main design changes introduced to the mechanism are related to three main domains: mechanism architecture and principles, increase of efficiency and simplification of the design, and functionality. A few critical lessons learnt are also described.
Glow discharge nitriding is being used increasingly more often for modifying the properties of ti... more Glow discharge nitriding is being used increasingly more often for modifying the properties of titanium and its alloys with the aim to increase their frictional wear resistance, fatigue strength, and, in the case of medical applications, to eliminate the metallosis effect. Unlike PVD methods, ion nitriding ensures the formation of diffusive layers with very good adhesion to the substrate, but which still have some disadvanteges such as the “edge effect” or “hollow cathode effect” which hinders treatment of complex workpieces. The paper compares nitrided layers produced on Ti6Al4V alloy using two different types of nitriding processes. The first process is conventional dc plasma nitriding (DCPN) where the samples were placed at the cathode potential, while the second one is a new method of cathodic cage plasma nitriding (CCPN) process, where the substrate is insulated from the cathode and anode. The experiments have shown that the treatment conducted in a cathodic cage can be alterna...
Materials Science, 2016
In most cases, machine components, which come in contact with each other, are made of steel. Comm... more In most cases, machine components, which come in contact with each other, are made of steel. Common steel types include 100Cr6 and X105CrMo17 are widely used in rolling bearings, which are subjected to high static loads. However, more and more sophisticated structural applications require increasingly better performance from steel. The most popular methods for improving the properties of steel is carburisation or nitriding. Unfortunately, when very high surface properties of steel are required, this treatment may be insufficient. Improvement of tribological properties can be achieved by increasing the hardness of the surface, reducing roughness or reducing the coefficient of friction. The formation of composite layers on steel, consisting of a hard nitride diffusion layer and an external carbon coating with a low coefficient of friction, seems to be a prospect with significant potential. The article describes composite layers produced on X105CrMo17 steel and defines their morphology, surface roughness and their functional properties such as: resistance to friction-induced wear, coefficient of friction and corrosion resistance. The layers have been formed at a temperature of 370°C in successive processes of: nitriding in low-temperature plasma followed by deposition of a carbon coating under DC glow-discharge conditions. An evaluation was also made of the impact of the nitrided layers on the properties and morphology of the carbon coatings formed by comparing them to coatings formed on non-nitrided X105CrMo17 steel substrates. A study of the surface topography, adhesion, resistance to friction-induced wear and corrosion shows the significant importance of the substrate type the carbon coatings are formed on.
Materials Science, 2016
Glow discharge nitriding is being used increasingly more often for modifying the properties of ti... more Glow discharge nitriding is being used increasingly more often for modifying the properties of titanium and its alloys with the aim to increase their frictional wear resistance, fatigue strength, and, in the case of medical applications, to eliminate the metallosis effect. Unlike PVD methods, ion nitriding ensures the formation of diffusive layers with very good adhesion to the substrate, but which still have some disadvanteges such as the "edge effect" or "hollow cathode effect" which hinders treatment of complex workpieces. The paper compares nitrided layers produced on Ti6Al4V alloy using two different types of nitriding processes. The first process is conventional dc plasma nitriding (DCPN) where the samples were placed at the cathode potential, while the second one is a new method of cathodic cage plasma nitriding (CCPN) process, where the substrate is insulated from the cathode and anode. The experiments have shown that the treatment conducted in a cathodic cage can be alternative for conventional ion nitriding, especially when used for small parts with complicated shapes used in the space or medical industry.
European cells & materials
The original extracorporeal pulsatile heart support device, called POLVAD, has been developed in ... more The original extracorporeal pulsatile heart support device, called POLVAD, has been developed in Poland. It was used in over 200 patients with the longest duration exceeding 6 months. The innovative tilting disc valve for this device is developing. The valve consists of original valve ring, free of pivot element crossing the blood stream. The ring is made of Titanium alloy with surface modified by different surface treatment to obtain the lowest thrombogenicity.
Szybki rozwój techniki stwarza konieczność zwiększania wymagań stawianych materiałom w zakresie w... more Szybki rozwój techniki stwarza konieczność zwiększania wymagań stawianych materiałom w zakresie właściwości mechanicznych, oddziaływania korozyjno-erozyjnego czy też odporności na wysokie temperatury itp. Spełnienie tych warunków jest możliwe poprzez wykorzystanie metod inżynierii powierzchni, które umożliwiają kształtowanie struktury, składu fazowego i chemicznego warstw wierzchnich obrabianych materiałów, a więc ich właściwości. Poprzez połączenie procesów utleniania jarzeniowego, osadzania powłok aluminium (stopów Al) metodą rozpylania magnetronowego oraz procesu zgrzewania dyfuzyjnego wytwarzane są materiały gradientowe. Jest to kompozyt warstwowy w układzie: stop tytanu Ti6Al2Cr2Mo/fazy międzymetaliczne Ti-Al/stop tytanu Ti6Al2Cr2Mo (również wielokrotność tego układu) z wytworzoną dyfuzyjną warstwą typu Al2O3+TiAl3+TiAl+Ti3Al. Są to nowe materiały kompozytowe, które charakteryzują się niższą gęstością niż stopy tytanu i dobrą odpornością na zużycie przez tarcie (rys. 5) i koroz...