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Tribological Properties of WCCo/cBNComposites Produced by Pulse Plasma Sintering

Wachowicz J., Truszkowski T., Rosiński M., Ossowski M., Skrabalak G., Cyrankowski M.

Archives of Metallurgy and Materials

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2018

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Vol. 63, iss. 4

1763--1768

EN

In view of their advantageous properties (high hardness, good frictional wear resistance, chemical and thermal stability at elevated temperatures), cubic boron nitride (cBN) and tungsten carbide (WC) are commonly used for the fabrication of cutting tools. The composites were consolidated at a temperature of 1100°C under a load of 100 MPa for 10 min. The density of the thus produced material was close to the theoretical value (about 99.6%), and the hardness HV30 was about 1950. The phases identified in the composite were WC, Co, and cBN. Microstructural examinations revealed that numerous trans-crystalline fractures through the cBN particles occurred in the material. The present study is concerned with the wear of the WCCo and WCCo/cBN composites. Comparative tribological examinations were performed in a tribological tester using the ball-on-disc arrangement under the conditions of dry friction. The counterspecimens were steel and Al2 O3 balls. The tests were conducted under a unit load of 10 N. After the tests, the surface of the samples was examined to describe the wear mechanisms active in various composite materials.

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Thermodynamic steam traps used in the wood industry

Cyrankowski M., Osipiuk J., Wilkowski J., Łapiński J.

Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology

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2014

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No. 88

46--49

EN

“Thermodynamic steam traps used in the wood industry”. We use three big families of demountable steam traps in the wood industry – mechanical steam traps with closed or open float, thermodynamic and thermostatic steam traps. In addition to these families dismountable steam traps have appeared on the market. They are produced in thermostatic and mechanical float versions. For heating devices, in which we have to deal with heat load, changing in the wide broad, which may lead to suspension of the condensate, we use pumping steam traps combining the features of float steam traps and portion pump. Using appropriate steam trap selection criteria, we are able to eliminate energy loss due to steam loss.

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The analysis of the energy demand for heating and cooling of the house built on the basis of the modernised Canadian wood-frame construction

Cyrankowski M., Wilkowski J., Górski J., Chludzińska D.

Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology

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2014

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No. 88

42--45

EN

“The analysis of the energy demand for heating and cooling of the house built on the basis of the modernised Canadian wood-frame construction”. This study shows calculation of demand for power needed for heating and cooling of a house built in compliance with modernised Canadian wood-frame construction technology and by modern solutions of construction details connections. Conducted calculations prove that the passive house built of wood-based materials enables to achieve the highest efficiency of thermal power demand for heating the building.