Wyniki wyszukiwania - BazTech

1

Roztwarzanie korozyjne metalicznych materiałów zastosowanych na konstrukcje zbiorników topionych w akwenach morskich z materiałami niebezpiecznymi

Jurczak W.

Logistyka

|

2014

|

nr 6

4977-4984

PL

W artykule opisano procesy korozyjne metalicznych materiałów stosowanych na konstrukcje metalicznych pojemników z bojowymi środkami trującymi (BST) zatopionymi w akwenach morskich. Opisano mechanizm i ocenę odporności degradacji korozyjnej stali zastosowanych na wspomniane pojemniki. Przedstawiono stan faktyczny konstrukcji tych pojemników i możliwości oceny ich trwałości. Przedstawiony w artykule stan faktyczny zlokalizowanych pojemników świadczy o konieczności podjęcia czynności zabezpieczających a działania prewencyjne ( monitoring korozyjny) można zastosować jedynie do niewielkiej ilości szczelnych pojemników.

EN

The paper concerns corrosion processes of the metallic materials used for construction of the containers for hazardous substances of military origin, which are disposed at the seabed. The mechanism of degradation and resistance to corrosion of steel intended for these containers have been described. Current condition of the containers and possible methods of their durability evaluation have been presented. The actual state of the localized containers described in the paper suggests application of protection measures whereas prevention action (corrosion monitoring) can be applied only to the limited number of hermetic containers.

2

Roztwarzanie korozyjne metalicznych materiałów zastosowanych na konstrukcje zbiorników topionych w akwenach morskich z materiałami niebezpiecznymi

Jurczak W.

Logistyka

|

2014

|

nr 6

757--764, CD 2

PL

W artykule opisano procesy korozyjne metalicznych materiałów stosowanych na konstrukcje metalicznych pojemników z bojowymi środkami trującymi (bst) zatopionymi w akwenach morskich. Opisano mechanizm i ocenę odporności degradacji korozyjnej stali zastosowanych na wspomniane pojemniki. Przedstawiono stan faktyczny konstrukcji tych pojemników i możliwości oceny ich trwałości. Przedstawiony w artykule stan faktyczny zlokalizowanych pojemników świadczy o konieczności podjęcia czynności zabezpieczających a działania prewencyjne ( monitoring korozyjny) można zastosować jedynie do niewielkiej ilości szczelnych pojemników.

EN

The paper concerns corrosion processes of the metallic materials used for construction of the containers for hazardous substances of military origin, which are disposed at the seabed. The mechanism of degradation and resistance to corrosion of steel intended for these containers have been described. Current condition of the containers and possible methods of their durability evaluation have been presented. The actual state of the localized containers described in the paper suggests application of protection measures whereas prevention action (corrosion monitoring) can be applied only to the limited number of hermetic containers.

3

Numerical and experimental analysis of spine’s transpedicular stabilizer

Kiel M., Marciniak J., Basiaga M., Szewczenko J., Kus W., Kokot G., Wadek T.

Journal of Achievements in Materials and Manufacturing Engineering

|

2010

|

Vol. 41, nr 1-2

124-130

EN

Purpose: The aim of the work was a numerical and experimental analysis of spine’s transpedicular stabilizer on lumbar part of spine. The result of the analysis was determination of displacements of the stabilizers’ elements. Design/methodology/approach: To define numerical characteristic of the lumbar spine – transpedicular spine stabilizer system, the finite element method was applied. Geometrical models of lumbar part of spine and transpedicular stabilizer were discretized by SOLID95 element. The boundary conditions imitating phenomena in real system with appropriate accuracy were established. The experimental analysis was carried out for spine’s transpedicular stabilizers which were implanted on lumbar part of pig spine. The analysis was realized by means of testing machine MTS Insight with the use of videoextensometer. Numerical and experimental analysis were carried out for stabilizer made of stainless steel Cr-Ni-Mo. System was loaded by uniaxial compression with forces from 50 N to 1600 N. Findings: The result of analysis was calculation of relative displacements of the transpedicular stabilizer in a function of the applied loading; F = 700 - 1600 N for numerical model and F = 50 - 1600 N for experimental model. Research limitations/implications: The results of numerical analysis for transpedicular stabilizer obtained by finite element method were used to determine a construction features of the stabilizer, and to select mechanical properties of metallic biomaterial. The calculation of displacements for stabilizer show that the proposed type of stabilizer enables correct stabilization of spine. Practical implications: Both results of numerical and experimental analysis showed correct selection of mechanical properties of metallic biomaterial which were used to made the proposed type of transpedicular stabilizer. Originality/value: Advantageous results of analysis showed that the type of stabilizer may be used in clinical practice.

4

Wpływ powłok metalicznych implantów na zmiany w tkance mózgowej i kostnej szczurów

Hajduga M., Zajęcki W.

Aktualne Problemy Biomechaniki

|

2009

|

z. 3

59--62

PL

W pracy przedstawiono wyniki badań histopatologicznych mózgu oraz kości czaszki szczura, do którego na okres 120 dni zaimplantowane były próbki wykonane z miedzi pokrytej srebrem. Wyniki badań wskazują na dobrą tolerancję wszczepionych implantów w zadanym okresie trwania doświadczenia.

EN

Paper presents the results of histophatological investigations of rats cerebral and osseous tissues being in contact with silver coated copper implants. Period of implantation carried out 120 days. Results of research indicate for good tolerance of implanted material in assigned period of enduring of experience.

5

Crevice corrosion resistance of NiTi alloy after various surface treatments

Kaczmarek M.

Archives of Materials Science and Engineering

|

2008

|

Vol. 29, nr 2

69-72

EN

Purpose: The aim of the work was determination of crevice corrosion resistance of NiTi alloy after various surface treatments. Design/methodology/approach: The evaluation of the electrochemical behavior of NiTi alloy was realized by recording of anodic polarization curves with the use of the potentiodynamic method in the presence of a crevice former. Tests were carried out in Tyrode’s physiological solution. Findings: Surface condition of metallic biomaterial determines its corrosion resistance. In the course of the work it was observed that only ground samples showed no resistance to crevice corrosion. Suggested surface modifications ensure good crevice corrosion resistance. Practical implications: On the basis of the obtained results it can be stated that the suggested surface treatment can be applied for medical implants due to increase of the crevice corrosion resistance and in consequence increase of biocompatibility. Originality/value: The paper presents the influence of various methods of surface treatment on crevice corrosion resistance of the NiTi alloy. The suggested methods can be applied in treatment of the material intended for medical applications especially as reduced and complex shape implants (contact of metallic material with human body fluids in a small and occluded space).

6

Wpływ wybranych implantów metalicznych na charakter zmian w tkance nerwowej szczura

Hajduga M. B., Zajęcki W., Hajduga M.

Aktualne Problemy Biomechaniki

|

2008

|

z. 2

65--70

PL

W pracy przedstawiono wyniki badań histopatologicznych mózgu szczura, do którego na okres 120 dni zaimplantowane były próbki wykonane z takich materiałów metalicznych jak: wolfram, molibden, chromel, wolfram-ren20. Wyniki badań wskazują na dobrą tolerancję wszczepionych materiałów w zadanym okresie trwania doświadczenia.

EN

Paper presents the results of histophatological investigations of rats cerebral tissues being in contact with implants of such metals like: molybdenum, tungsten-rhenium 20, chromel and alumel. Period of implantation carried out 120 days. Results of research indicate for good tolerance of implanted material in assigned period of enduring of experience.

7

Analiza połączenia protetycznego metal - ceramika

Hajduga M., Zdziech T.

Aktualne Problemy Biomechaniki

|

2008

|

z. 2

71--78

PL

Celem pracy jest analiza struktury połączenia pomiędzy materiałem ceramicznym, a podbudową metaliczną, w zależności od obecności, lub braku warstwy oxydacyjnej na powierzchni metalu. W pracy przedstawiono wyniki analiz charakteru połączenia, które zostały przeprowadzone na jednym stopie metalu i jednym materiale ceramicznym o zróżnicowanym przygotowaniu podłoża zalecanym i nie zalecanym przez producenta. Wyniki badań metalograficznych makrostruktury koron przedstawiono na próbkach za pomocą mikroskopu stereoskopowego w powiększeniach 10x, 200x, 500x. Zmiany stężenia pierwiastków analizowano przy pomocy mikroanalizatora rentgenowskiego Jeol J7, które przeprowadzono na granicy warstw metal-ceramika.

EN

The aim of the work is an analysis of connection structure between a ceramic material and a metallic substructure depending on presence or lack of an oxidised layer on the metal surface and the class of metal treatment by aluminium oxide which were conducted on one metal alloy and one ceramic material with various preparation of a base which was and was not recommended by the producer. Results of metallographic researches of heads macrostructure were recorded on samples for analysis which were gained with the use of a stereoscopic microscope with a magnification of 10x, 200x, 500x. Changes of chemical elements concentration were analyzed by a rentgenographic microanalizer Jeol J7 which was recorded on the border of metal-ceramics layers.

8

Corrosion resistance of NiTi alloy in simulated body fluids

Kaczmarek M.

Archives of Materials Science and Engineering

|

2007

|

Vol. 28, nr 5

269-272

EN

Purpose: Corrosion resistance of an implant alloy is a very important determinant of its biocompatibility. The nature of an environment and surface treatments have a significant influence on corrosion. Most of the knowledge on the corrosion behavior of NiTi is from studies of "standard" corrosion tests. In fact, the knowledge of the corrosion behavior of NiTi inside the body is very limited. The main aim of the research was evaluation of corrosion resistance of NiTi alloy in various simulated body fluids. Design/methodology/approach: The evaluation of the electrochemical behavior of NiTi alloy was realized by recording of anodic polarization curves with the use of the potentiodynamic method. The tests were carried out for differently modified surfaces in diverse simulated body fluids. Findings: Surface condition of a metallic biomaterial determines its corrosion resistance. In the course of the work the good corrosion resistance of all the tested samples (with different surface conditions) was observed. Research limitations/implications: The obtained results are the basis for the optimization of physicochemical properties of the NiTi alloy. The future research should be focused on selected specific implants specially with respect to their application features. Practical implications: On the basis of the obtained results it can be stated that the suggested surface treatment can be applicable for NiTi alloys due to the increase of the corrosion resistance. Originality/value: The paper presents the influence of various methods of the surface treatment on corrosion resistance of the NiTi alloy. The suggested surface treatment methods can be applied to implants intended for diverse medical applications, especially in cardiology and urology.

9

Analiza zmian stężeń tlenu w wybranych materiałach metalicznych w obecności tkanki żywej

Hajduga M., Oracz K.

Aktualne Problemy Biomechaniki

|

2007

|

z. 1

45--51

PL

W pracy zostały przedstawione wyniki badań obecności kilku metali (pochodzących z takich materiałów jak: wolfram, molibden, chromel, wolfram-ren 20 w tkance mózgowej oraz podskórnej szczurów. Analizowano zmiany stężeń podstawowego pierwiastka metalicznego oraz tlenu w badanych mikroobszarach przed i po implantacji. Otrzymane wyniki badań wskazują na przechodzenie cząstek tlenu z powierzchni metalicznej do tkanki żywej dla niektórych metali. Można tu mówić o dyfuzji tlenu i absorpcji przez tkankę żywą np. dla wolframu. Natomiast dla pozostałych pierwiastków takich jak np. molibden dyfuzja i wsteczna dyfuzja tlenu w obszarze badanych tkanek była stabilna.

EN

Paper contains results of presence several metals (originating from the source metallic materials like wolfram, molybdenum, chromel wolfram – ren 20 in brain and subcutaneous tissue of rats. Authors analyzed changes of basic metallic elements concentration and oxygen in tested micro-areas before and after implantation. The obtained data indicate passing of oxygen particles from metallic surface to lively tissues in some cases. We can say about oxygen diffusion and absorption by lively tissue when wolfram is applied. Whereas, with reference to remaining elements, like e.g. molybdenum, the diffusion and backward diffusion of oxygen in investigated areas of tissue was stable.

10

Opracowanie monografii dotyczącej fluorescencyjnej analizy rentgenowskiej materiałów metalicznych stosowanych w przemyśle lotniczym

Stankiewicz G.

Polski Przegląd Kartograficzny

|

2005

|

T. 37, nr 1

56-57

PL

Celem pracy bylo przygotowanie monografii dotyczącej fluorescencyjnej analizy rentgenowskiej większości materiałów metalicznych wykorzystywanych na konstrukcje lotnicze, która pozwoli uporządkować ich analitykę i tym samym lepiej przygotować polski przemyśl lotniczy do wprowadzania (między innymi w ramach offsetu) nowych technologii, wymagających dotrzymania w sposób powtarzalny precyzyjnej zawartości składników stopowych.

EN

The aim of this paper was to prepare the monograph on fluorescent X-ray analysis of the majority of metallic materials intended for aircraft constructions. This will allow their analytics to be organised and the Polish aircraft industry to be better prepared for introduction (i.a. under offset) of new technologies that require maintaining precise contents of alloy components on a repeatable basis.

11

Wyciskanie na zimno metalicznych materiałów porowatych

Galanty M.

Kompozyty

|

2002

|

R. 2, nr 4

135-138

PL

Przedstawiono wybrane wyniki badań związane z wyciskaniem na zimno metalicznych materiałów porowatych na przykładzie rozpylanego proszku aluminiowego RAL 1 dla wyraźnie zróżnicowanych frakcji ziarnowych 30, 110 i 450 um. Wykorzystano specjalnie przygotowany wsad wstępnie dwustronnie prasowany w szerokim zakresie ciśnień oraz proszek sypki frakcji 450 um. Wyciskanie prowadzono na prasie hydraulicznej 3MN o stabilizowanej prędkości ruchu stempla. Badano wpływ ciśnienia prasowania na charakterystykę siłową procesu, a poprzez ustalenie poziomu siły oceniano wpływ zastosowanego smaru, prędkości wyciskania, stopnia odkształcenia i kształtu matrycy. Określono zmiany gęstości wsadu i wyrobu w zależności od parametrów procesu. Uzyskane wyniki pozwalają dokonać oceny możliwości wyciskania na zimno różnymi metodami metalicznych materiałów porowatych i ustalić właściwy dobór warunków prowadzenia tego procesu.

EN

The well known advantages of P/M technology focus our attention also on manufacturing long products of complicated cross-section. The extrusion process is capable of producing such products, and additionally, due to the favourable state of stress in the deformation zone, the high degree of material consolidation can be obtained. This influences in a positive way the mechanical properties of the product. The two extrusion techniques are possible in practice. First one (Fig. 1a,b) is similar to the conventional extrusion of solid feedstock; it consists in forward or backward extrusion of compacted samples. The second case consists in extrusion of a loose powder (Fig. 1d) material poured directly into the extrusion container, in which the opening (die) is covered with a metallic disk. The loose powder pressed by the punch undergo densification, next pushes out the disk and flows out through the die in the form of a solid extrudate. The second technique can be performed only in a room temperature without using of binders, that are usually added to the metal powder to enhance it densification. In this case the decisive role play the adhesive forces between the powder particles. The attraction of this procedure is shortened way from the powder to finished product, by eliminating compaction and sintering from the processing route. The aim of this work was to perform the extensive experiments on the cold extrusion of compacts and loose metallic powders. Three selected fractions of technical purity (99.5 wt.%) atomised aluminium powder RAL1 of 0:30, 110 and 450 um were used to prepare compacts of different green density (Fig. 2) for cold extrusion (Figs 3-5). Additionally, the loose fraction of 450 um was used directly in the extrusion. The extrusion was performed on a 3MN capacity vertical hydraulic press. The container of 35 mm in diameter was equipped with a dies having different opening diameter within the range of 16:9 mm. Before filing the container the die opening was covered with aluminium disks of various thickness. Due to this fact the extrusion was initiated at different loads, so that, the powder in the container was consolidated prior to extrusion to different density. At the stable state of the extrusion the process was interrupted and the rest of the feedstock was taken out of the container. The rests were next submitted to hardness examination on their axial cross-section (Fig. 6) to determine the mode of the material flow within the container. The density and hardness at different locations of the extruded rods were also examined. The extrusion load in dependence on the ram displacement was recorded during experiments (Figs 3, 7). The samples from different locations of the extrudate were submitted to mechanical testing. The obtained results enabled to determine the influence of the extrusion mode on the load required, on the material flow and on the distribution of mechanical properties along the extrudate length.