The effects of manganese phosphate coating wear resistance of chilled ductile iron camshafts

Yıl 2013, Cilt: 17 Sayı: 3, 471 - 476, 01.06.2013

Tarık Gün Fatih Özaydın

Öz

The ductile iron camshaft are preferred due to high toughnees and strength features in the automobile industry. Through the coolants used in the camshaft production high surface hardness is achieved. In this study, the wear resistance effects of ductile iron chill produced camshafts coated with manganese phosphate are researched. The camshaft surfaces produced as ductile iron chill are coated with manganese phosphate. The coating surfaces are observed with scanning electron microscope (SEM). The changes occurring on the cam profiles are measured with running the wear resistance of the manganese phosphate coating on the camshafts on the engine test rig with 30 minutes interval in 1000rpm. In order to compare the results of uncoated camshafts run on engines are checked against simultaneously. As result, the manganese phosphate coated cams were 2,8 times less worn up than the uncoated cams. The manganese phosphate coated ductile iron chill camshafts are less worn up according to uncoated camshafts because of the oil holding feature of manganese phosphate coating.

Anahtar Kelimeler

Camshaft, Manganese phosphate coating, Chilled ductile iron, Wear resistance

Sfero chill döküm kam millerinde mangan fosfat kaplamanın aşınma direncine etkisi

Öz

The ductile iron camshafts are preferred due to high toughness and strength features in the automobile industry. Through the coolants used in the camshaft production high surface hardness is achieved. In this study, the wear resistance effects of ductile iron chill produced camshafts coated with manganese phosphate are researched. The camshaft surfaces produced as ductile iron chill are coated with manganese phosphate. The coating surfaces are observed with scanning electron microscope (SEM). The changes occurring on the cam profiles are measured with running the wear resistance of the manganese phosphate coating on the camshafts on the engine test rig with 30 minutes interval in 1000rpm. In order to compare the results of uncoated camshafts run on engines are checked against simultaneously. As result, the manganese phosphate coated cams were 2,8 times less worn up than the uncoated cams. The manganese phosphate coated ductile iron chill camshafts are less worn up according to uncoated camshafts because of the oil holding feature of manganese phosphate coating.

Anahtar Kelimeler

Kammili, Mangan fosfat kaplama, Sfero chill döküm, Aşınma direnci

Kaynakça

• Xin Tong, Hong Zhou, Lu-quan Ren, Zhi- hui Zhang, Wei Zhang and Ren-dong Cui Effects of graphite shape on thermal fatigue resistance of cast iron with biomimetic non-smooth surface International Journal of Fatigue 31/4, 668-677, (2009)
• L. Collini a, G. Nicoletto a, R. Konecna “Microstructure and mechanical properties of pearlitic gray cast iron” Materials Science and Engineering A, 488, 529–539, (2008)
• Yang Y, Rosochowski A, Wang X, Jiang Y. Mechanism of ”black line ” formation in chilled cast iron camshafts. J Mater Process Technol 2004;145: 264–7.
• Sui P C and Torng T Y. Cam/roller component fatigue reliability analysis (SAE 950708 Transactions). Journal of Materials and Manufacturing, Section 5, 1995, 104: 618–627. Wang G, Taylor D, Bouquin B, et al. Prediction of fatigue failure in a camshaft using the crack modeling method. Engineering Failure Analysis, 2000(7): 189–197.
• Ferreira J C. A study of cast chilled iron processing technology and wear evaluation of hardened gray iron for automotive application. Journal of Materials Processing Technology, 2002, 121: 94–101.
• Müller H and Kaiser A. Composite camshaft — avoid lobe grinding using precision PM lobes. Journal of Materials and Manufacturing, 1997(5): 106: 1–5.
• Heinrich J G, Krüner H. Silicon nitride materials for engine applications. Ceramic Forum International, 1995,72(4): 167–175.
• Michalski J, Marszalek J and Kubiak K. An experimental study of diesel engine cam and follower wear with particular reference to the properties of the materials. Wear, 2000, 240: 168–179.
• P. Hivart, et al., Seizure behaviour of manganese phosphate coatings according to the process conditions, Tribol. Int. 30 (8) (1997) 561– 570. P. Hivart, et al., Numerical identification of bulk behavior law of manganese phosphate coatings. Comparison with tribological properties, J. Coat. Technol. 75 (942) (2003) 37–44.
• T. Oyamada, Y. Inoue, Evaluation of the wear process of cast iron coated with manganese phosphate, Tribol. Trans. 46 (1) (2003) 95– 100.