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Wykorzystanie przewodników jonowych w budowie czujników stężenia składników gazów wylotowych w celu monitorowania reaktora katalitycznego w silnikach o zs w aspekcie systemu obd ii/eobd

100%

Rychter M.

tom nr 3

CD-CD

System OBD, którego wynikiem działania jest czytelny sygnał wysyłany do kierowcy powiadamiający o powstaniu awarii oraz informacja diagnostyczna umożliwiająca szybką i efektywną lokalizację uszkodzenia. Stworzenie techniczno-prawnych warunków opracowania i wdrożenia takiego właśnie systemu było celem normy OBD II, która stała się zbiorem techniczno-prawnych wymagań definiujących pokładowy system diagnostyczny, standaryzujący procedury diagnostyczne i strumień informacji diagnostycznych skierowany do użytkownika. W artykule przedstawiono wybrane sposoby monitorowania reaktorów katalitycznych spalin oraz przedstawiono koncepcję wykorzystania przewodników jonowych w budowie czujników określających stężenie składników gazów wylotowych w silniku o zapłonie samoczynnym.

The aim of this paper is to determine the basis for the monitoring of catalytic converters in compression ignition engines by the emission level of a selected exhaust gas component as a diagnostic signal. The emission of NOx has been taken as the basis. This required the development of a specialized system allowing the reduction of NOx and obtaining of a diagnostic signal reflecting the level of the said reduction.

Structure and electrical properties of oxide-ion conductors in the Bi3NbO7-Bi3YO6 system

75%

Kozanecka-Szmigiel A. , Krok F. , Abrahams I. , Wrobel W. , Chan S. C. M. , Dygas J. R.

Materials Science Poland

2006

tom Vol. 24, No. 1

31--37

A study of the structure and electrical conductivity of Bi3Nb1-xYxO7-x is presented. X-ray diffraction confirms full solid solution formation in this system, with the adoption of a fluorite-type structure. Superlattice ordering of the anion sublattice is evident in neutron diffraction data, the nature of which varies with composition. At low values of x, long-range ordering is present, whereas above x = 0.4 only local ordering is observed. Arrhenius plots of the total electrical conductivity of all samples containing yttrium show two linear regions with different activation energies, with evidence for a phase transition between 450 and 680 °C.

Calcium zirconate as a solid electrolyte for electrochemical devices applied in metallurgy

63%

Dudek M. , Róg G. , Bogusz W. , Kozłowska-Róg A. , Bućko M. , Zych Ł.

Materials Science Poland

2006

tom Vol. 24, No. 1

253--260

Stoichiometric calcium zirconate and CaZrO3 samples with an excess of calcia or zirconia were obtained from powders prepared by the citrate method. XRD measurements were used to determine the phase compositions of the sintered materials as well as their crystal structures. The compositional dependence of the calcium zirconate cell parameter indicates that an excess of calcia or zirconia form a solid solution. Stoichiometric CaZrO3 appeared to be a rather poor oxygen ion conductor, whereas calcium zirconate samples with an excess of calcia or zirconia exhibit pure oxygen conductivity. The introduction of a respective excess of cations led in both cases to a significant enhancement of conductivity. The fracture toughness, hardness, and flexural strength of the samples were also investigated. The mechanical and electrical properties of CaZrO3-based materials are comparable to those of zirconia solid electrolytes. The lower thermal expansion coefficient and better resistance to thermal shock make CaZrO3 a more suitable solid electrolyte for metallurgical applications.

Bi8V2O17 - a stable phase in the Bi2O3-V2O5 system

63%

Wrobel W. , Krok F. , Abrahams I. , Kozanecka-Szmigiel A. , Malys M. , Chan S. C. M. , Dygas J. R.

Materials Science Poland

2006

tom Vol. 24, No. 1

23--30

Bi8V2O17 is commonly observed as an intermediate phase in the synthesis of compounds in ternary systems of the type Bi2O3-V2O5-MexOy. It is also seen as an end product at particular compositions in these systems. A rhombohedral substructure model for this phase is presented along with electrical parameters. Evidence from the Arrhenius plot suggests a phase transition at around 550 °C. The existence of a limited solid solution of Bi8V2O17 with ZrO2 is also discussed.

New composite materials prepared by high-pressure infiltration of superionic glasses into diamond powder compacts

51%

Foltyn M. , Zgirski M. , Garbarczyk J. , Wasiucionek M. , Pałosz B. , Gierlotka S. , Nowiński J. L.

Materials Science Poland

2006

tom Vol. 24, No. 1

141--146

Glassy-crystalline composites have been prepared by infiltrating highly conducting silver vanadate glasses into diamond powder compacts. The process of infiltration was carried out at a high isostatic pressure (from 1.5 to 8 GPa) and temperatures up to 800 °C. The resulting composites have conductivities comparable to those of glasses used for infiltration, but exhibit a wider range of thermal stability (up to 300 °C) than glasses. Additionally, they have much better mechanical properties, in particular, being less brittle and exhibiting higher microhardness than glasses.