EFFECT OF MOLYBDENUM DISULFIDE AND OPEN POROSITY ON DURABILITY OF SINTERED VALVE SEATS IN COMBUSTION ENGINES FUELLED WITH COMPRESSED NATURAL GAS

1 NOWAK Jan
Co-authors:
2 ADAMASZEK Krzysztof 3 PIECHA Inga 4 JURASZ Zbigniew
Institutions:
1 BOSMAL Automotive Research &Development Institute Ltd., Bielsko-Biala, Poland, EU, jan.nowak@bosmal.com.pl
2 BOSMAL Automotive Research &Development Institute Ltd., Bielsko-Biala, Poland, EU, krzysztof.adamaszek@bosmal.com.pl
3 BOSMAL Automotive Research &Development Institute Ltd., Bielsko-Biala, Poland, EU, inga.piecha@bosmal.com.pl
4 BOSMAL Automotive Research &Development Institute Ltd., Bielsko-Biala, Poland, EU, zbigniew.jurasz@bosmal.com.pl
Conference:
25th Anniversary International Conference on Metallurgy and Materials, Hotel Voronez I, Brno, Czech Republic, EU, May 25th - 27th 2016
Proceedings:
Proceedings 25th Anniversary International Conference on Metallurgy and Materials
Pages:
801-806
ISBN:
978-80-87294-67-3
ISSN:
2694-9296
Published:
14th December 2016
Proceedings of the conference were published in Web of Science and Scopus.
Metrics:
108 views / 19 downloads
Abstract

Valve-seats are the most thermally and mechanically loaded components of combustion engines. These loads increase rapidly with the use of LPG and CNG gaseous fuels. Conducted at BOSMAL Automotive Research & Development Institute numerous durability tests of self - and spark ignition combustion engines proved, that the temperature of diesel, gasoline, LPG and CNG exhaust gases measured in the exhaust manifold reaches in case of CNG around 1223 K. The valve seats fueled with LPG are usually manufactured from high-alloyed sintered powders. Attempts of application of same valve seats to the engines fueled with CNG (as engines fueled with LPG) were finished unsuccessfully. The aim of the study was to investigate the effect of molybdenum disulfide and open porosity saturated with Cu on the durability of the valve seat faces in the operating conditions of two-cylinder engine type 0.9 SGE TC80 CNG fueled with natural gas. Durability test was conducted according to the methodology of BOSMAL procedure. There were measuring (among others parameters) the power, torque and rotation speed, also the exhaust gases temperature and the hourly fuel consumption. Studies had shown a strong influence of molybdenum disulfide and open porosity on the durability of tested valve seats in engine fueled with compressed natural gas (CNG).

Keywords: sintered valve seat, combustion engine, CNG

© This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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