Wyniki wyszukiwania - Biblioteka Nauki

1

Wpływ dodatków alkoholowych do roztworów KOH na morfologię różnych płaszczyzn Si (hkl)

100%

Kramkowska M. , Zubel I.

|

tom Vol. 46, nr 2-3

12-13

PL

Badano wpływ dodatków alkoholowych z grupy butanoli do roztworu KOH na morfologię różnych płaszczyzn (hkl) krzemu uzyskiwanych w procesie trawienia anizotropowego. Stwierdzono, że wprowadzenie dodatków poprawia gładkość powierzchni typu (hh1) a pogarsza morfologie płaszczyzn (h11). Ma to związek z konfiguracją wiązań na tych płaszczyznach.

EN

The effect of alcohol additives from butanol group to KOH solution on the morphologies of different Si (hkl) surfaces fabricated by anisotropic etching has been studied. It was stated that the additives improve the surface roughness of (hh1)-type surfaces whereas (h11)-type surfaces undergo worsening. The effect is connected with bond configurations on the studied surfaces.

2

Nadstopy kobaltu otrzymywane chemicznie w stałym polu magnetycznym

100%

Zieliński M. , Miękoś E. , Szczukocki D.

|

tom R. 16, nr 5

24-28

3

Multi-sensor evaluation of the concrete within the interlayer bond with regard to pull-off adhesion

84%

Sadowski Ł. , Żak A. , Hoła J.

|

tom Vol. 18, no. 2

573--582

EN

The article presents the results of multi-sensor evaluation of the concrete within the interphase between overlay and existing substrate with regard to pull-off adhesion. It has been shown that both the effective surface area of the existing concrete substrate and the contribution of the exposed aggregate on this substrate, as a result of concrete substrate surface treatment, have a significant impact on pull-off adhesion. The highest adhesion was obtained when the surface of the existing concrete substrate was shot-blasted. This method of surface treatment provides both a high coarseness of the surface of the existing concrete substrate and considerable exposure of the aggregate on this surface. In order to clarify why this method of surface treatment of existing concrete substrate is advantageous with regard to the possibility of obtaining high adhesion, scanning electron microscopy (SEM) was used. SEM microstructural analysis was performed on concrete cubic specimens taken from the interphase zone between the overlay and existing concrete substrate. The results of these studies, including the contact type between the overlay made of cement mortar and the existing concrete substrate, are presented in the study.

4

Thermal stability and mechanical properties of sputtered Chromium-Molybdenum-Nitride (CrMoN) coatings

84%

Zou Y. , Walock M. J. , Catledge S. A. , Nouveau C. , Stanishevsky A.

|

2009

|

tom Vol. 37, nr 2

369-374

EN

Purpose: The purpose of paper is to determinate thermal stability and mechanical properties of sputtered chromium-molybdenum-nitride (CrMoN) coatings. Design/methodology/approach: We have deposited 1.8 m-thick ternary Cr0.5Mo0.5N1.0 films on a CoCrMo alloy using a RF dual magnetron sputtering system, with Cr and Mo targets and N2 as the reactive gas. These films were subjected to various thermal treatments in Ar, air, and microwave plasma. The hardness, Young’s modulus, surface roughness, microstructure, and composition of films were studied by nanoindentation, AFM, x-ray diffraction, and x-ray photoelectron spectroscopy. Findings: The as-prepared CrMoN films consist of an amorphous Cr-rich nitride matrix with Mo-rich nitride crystalline grains, about 15 nm in size. These films are thermally stable up to 600şC in air. Thermal annealing in the air at 800şC resulted in an increase in surface roughness and hardness, due to film oxidation, with Cr2O3 as the main crystalline phase. Plasma treatment in a H2/N2 gas mixture, at 800şC, did not lead to grain growth. Instead, the existing grains were reduced to about 10 nm and a new nanocrystalline phase has been formed. This leads to a decrease in the surface roughness, and an increase in the film hardness. In addition, we have further modified the film properties through a combined thermal treatment process. Thermal annealing in the air at 800şC, followed by microwave plasma treatment at 800şC resulted in a film with decreased surface roughness, and improved mechanical properties. Reversing the order of the thermal treatments resulted in a further decrease in surface roughness, but it shows a reduction in the mechanical properties. Research limitations/implications: The present investigation was carried out with only one composition, Cr0.5Mo0.5N1.0, of ternary thin-film system. Originality/value: The combination of thermal and plasma treatments can be used to control the microstructure, surface topography, and mechanical properties of ternary CrMoN films. Such post-deposition treatments can further improve the materials properties for desired application, and to produce new nanocomposite materials with technologically important combination of properties.

5

Badania porównawcze zużycia i trwałości ostrza frezów tarczowych z powłokami przeciwzużyciowymi po ostrzeniu na szlifierce CNC

67%

Gołąbczak M. , Drużny P. , Jędrzejczak A. , Mirski T. , Gołąbczak A.

|

tom Nr 4

10--18

PL

W artykule przedstawiono proces ostrzenia frezów tarczowych z powłokami przeciwzużyciowymi na szlifierce CNC oraz wyniki badań porównawczych po ostrzeniu, dotyczące oceny ich zużycia i okresu trwałości w warunkach przemysłowego przecinania profili stalowych ze stali konstrukcyjnej S320GD z powłoką antykorozyjną Magnelis ZM310.

EN

In this paper the sharpening proces of disc cutters with wear protection coating on a CNC grinding machine was described. The results of comparative tests after sharpening to evaluate wear and durability under the conditions of industrial cutting of stainless steel sections S320GD with Magnelis ZM310 corrosion protection coat Leakage was presented too.

6

Nanokrystaliczne powłoki kompozytowe osadzane elektrochemicznie.

67%

Szeptycka B. , Gajewska A.

|

tom R. XXIII, nr 5

453-457

PL

Podjęto próby wytwarzania nanokrystalicznych powłok kompozytowych z osnową niklową o podwyższonej odporności na zużycie. Do elektroosadzania nanokrystalicznych powłok kompozytowych używano niskostężeniowej kąpieli niklującej z małą zawartością jonów niklu (II) - 0,76M, związki organiczne, kationowe fluorowane zwilżacze i cząstki dyspersyjne: SiC razem z PTFE lub CFx oraz bor. Zawartość cząstek w powłokach oznaczano grawimetrycznie. Mikrotwardość mierzono metodą Vickersa przy obciążeniu 0,05 kg a chropowatość przy użyciu profilografu. Morfologię powierzchni powłok kompozytowych obserwowano pod mikroskopem skaningowym (SEM). Badania odporności na zużycie wykonano (dla powłok Ni-SiC-fluoropolimer) na testerze T-05, stosując smarowanie, liniowe prędkości poślizgu w zakresie 0,27-1 m/s oraz obciążenie 20N. Drugą serię badań (dla powłok Ni-B) wykonano na Kulotesterze, bez smarowania, stosując kule o średnicy 30 mm i kąt 35'' oraz drogę tarcia 5000 obrotów. Na podstawie śladów wytarcia i pomiarów ich średnicy obliczano głębokość wytarcia, która była miarą odporności na zużycie. Otrzymano nanokrystaliczne kompozytowe warstwy niklowe z dużą odpornością na zużycie w porównaniu z powłoką niklową bez dyspersji.

EN

The possibilities of production of wear-resistant nanocrystalline composite coatings with nickel matrix were investigated. Nickel plating bath with low concentration of nickel ions (0,76 mol/cubic dm), organic compounds, cationic fluorosurfactants and dispersed particles: SiC in pair with PTFE or CFx and boron were used for deposition of the nanocrystalline composite electrochemical coatings. The content of particles in coatings was examined gravimetrically. The microhardness of the deposited layers was measured using Vickers' method at a load of 0,05 kg and roughness was measured using profilograph. The surface morphology of the composite coatings was investigated by scanning electron microscopy (SEM). The wear behaviour was examined (for Ni-SiC-fluoropolymer coatings) by wheel abrasion test, as the abrasive wheel rolled with lubrication along the specimen surface at a speed range of 0,27-1 m/s under specific load in the range of 20N. Second experiment (for Ni-B coatings) was made without lubrication and was performed using a technique based on the measuring system comprising a flat surface and a ball. The layers were subjected to wear by dry slide friction using a 30 mm diameter ball at an angle of 35'', duration of friction was 5000 turns. On the basis of the wear traces and measurement of their diameter, the depth of the wear was calculated, which was measure of wear resistance. The nanocrystalline nickel composite coatings with a greater wear resistance than those of the electrodeposited nickel were obtained.