PL
 |
EN
Nowa wersja platformy, zawierająca wyłącznie zasoby pełnotekstowe, jest już dostępna.
Przejdź na https://bibliotekanauki.pl
Preferencje help
Polish version English version Język
Widoczny [Schowaj] Abstrakt
Liczba wyników

Znaleziono wyników: 9

Liczba wyników na stronie
first rewind previous Strona / 1 next fast forward last
Wyniki wyszukiwania
help Sortuj według:

help Ogranicz wyniki do:
first rewind previous Strona / 1 next fast forward last
1
Differential inhibition of phosphodiesterase according to the organ origin of the enzyme
100%
Uzunov P. , Petkov V. , Stancheva S.
|
|
nr 2
2
Content available Cermet composite material based on aluminothermy
100%
Penkov I. , Petkov V. , Valov R.
|
|
tom Vol. 57, no. 4
293--296
EN
A new method for synthesis of cermet composite materials was developed based on aluminothermy. Employing this method a cermet composite material with a high content of AlN crystal phase was synthesized. Fine powders of aluminum and silica glass were mixed and heated in a corundum crucible for 6 hours at 1100°C in air. The X-ray diffraction analysis showed that the composite material thus synthesized contains a high concentration of AlN particles (about 33 vol. %) embedded in an aluminum silicon alloy. A small amount of Al2O3 particles (about 8 vol. %) was also found. The method proposed can also be used for synthesis of aluminum matrix composite materials containing, besides AlN, other ceramic reinforcement phases. The properties of these composite materials can be tailored by choosing an appropriate composition of the initial powder mixture for aluminothermic synthesis.
3
Content available Characteristics and Properties of Chromium Coatings with Diamond Nanoparticles Deposited Directly on Aluminum Alloys
89%
Petkov V. , Valov R. , Simeonova S. , Kandeva M. , Petkov V. , Valov R. , Simeonova S. , Kandeva M.
|
4
Content available Electrochemical Deposition of Silver on Aluminum Alloys
88%
Valov R. , Petkov V. , Valkano S. , Valov R. , Petkov V. , Valkano S.
|
5
Content available Nanocomposite chromium coatings on aluminum alloys
75%
Gidikova N. , Valov R. , Petkov V. , Sułowski M. , Witkowska M. , Cempura G.
|
|
tom Vol. 57, no. 4
241--244
EN
Chromium coatings modified with nanodiamond particles were deposited on aluminum alloys. The concentration of the nanodiamond particles in the chrome plating electrolyte was from 5 to 25 g/l. The thickness of the layer varied between 30 and 70 μm. The layers were prepared with the same electrolytic conditions and were measured with a metallographic microscope. The maximum microhardness of the coating was 840 kg/mm2. X-ray diffraction analysis was performed with a Siemens D500 apparatus using the Bragg-Brentano technique. The distribution of Cr, Al and O in the cross section was studied by SEM-EDS. It was found that the layers were homogenous – only consisted of chromium. The coatings were also studied for non-destructivity by X-ray 3D computed tomography. It was found that the coatings were intact and continuous along the section. In order to obtain the maximum yield of chromium and maximum thickness of the layer, the optimum nanodiamond particle concentration was 10 g/l.
6
Content available Sintered Steels Coated with a Chromium Layer Doped with Diamond Nanoparticles
75%
Petkov V. , Valov R. , Witkowska M. , Madej M. , Cempura G. , Sułowski M.
|
|
tom Vol. 64, iss. 4
1633--1638
EN
Electrochemical Cr coatings doped with diamond nanoparticles were deposited on sintered steels with different carbon contents (0.2-0.8 wt.-%). The mechanical properties of surfaces as hardness and wear resistance increase as compared to the steel substrate. Microcutting and microgridding mechanisms were observed after tribological tests, but also adhesive wear in some areas was observed. X-ray examination indicated that the layer was textured, with the exception of the sample with the highest concentration of diamond nanoparticles in the electrolyte (42 g/l). The intensity ratio ICr110/ICr200 was calculated and compared with the indices for a standard sample. The greatest differences in the intensity ratio occurred for the samples with low carbon content (0.2% C). On the other hand, more the material is textured the greater the difference.
7
Content available Wear Resistant Chromium Coatings Modified with Diamond Nanoparticles/ Odporność Na Zużycie Ścierne Powłok Chromowych Modyfikowanych Nanocząstkami Diamentu
75%
Gidikova N. , Sułowski M. , Ciaś A. , Petkov V. , Madej M. , Valov R.
|
|
nr 4
8
Content available Sintered Steels Coated with a Chromium Layer Doped with Diamond Nanoparticles
71%
Petkov V. , Valov R. , Witkowska M. , Madej M. , Cempura G. , Sułowski M. , Petkov V. , Valov R. , Witkowska M. , Madej M. , Cempura G. , Sułowski M.
|
|
nr 4
9
Content available Composite Coatings of Chromium and Nanodiamond Particles on Steel
51%
Petkov V. , Valov R. , Gidikova N. , Sulowski M. , Cempura G.
|
first rewind previous Strona / 1 next fast forward last
JavaScript jest wyłączony w Twojej przeglądarce internetowej. Włącz go, a następnie odśwież stronę, aby móc w pełni z niej korzystać.