Effect of Chromium Doping to Hardness Properties in the Manufacture of Spur Gears Made from Ferrous Powder

Albert Daniel Saragih, Slamet Sutjipto


A gear is a part of a machine that has a very complex shape so that it requires special care and expertise in the manufacturing process. Powder metallurgy offers an efficient manufacturing process for the production of these complex machining parts. In this study, Cr metal powder was selected to increase the hardness properties of spur gears made from iron (Fe) powder. Doping Cr by 0%; 0.5%; 10%, 1.5% and 2.0% will be added in gear manufacturing. Water is used as a binder with a ratio of 1:15 which is then packed by 15,000 kg or 15 tons then heated or sintered at a temperature of 1200 oC for 1 hour. The shrinkage ratio of the sample to the sintering treatment averaged 4.6%. 0.2 kg of load applied to the Vickers hardness test. Vickers hardness values obtained were 60, 77, 90, 184 and 211 respectively for the Cr doping of 0%; 0.5%; 10%, 1.5% and 2.0%. From these data it is found that the addition of the element Cr increases the hardness properties of iron gears. The hardness value shown is still too small, this is because there is still a lot of porosity generated in the sintering process because it is not in a vacuum condition.


spur gears; chromium; doping; sintering

Full Text:



Orangeleaf Sysyem Ltd, 2020, Market for Powder Metallurgy Components. https://www.pm-review.com/introduction- to-powder-metallurgy/markets-for- powder-metallurgy-components/. Diakses tanggal 1 April 2020.

E.P.D. Garmo, J.T. Black and R.A. Kohser, 2008. Materials & Process In Manufacturing (USA: Tenth Edition).

M.S. Yafie dan W. Widyastuti, 2014, Pengaruh variasi temperatur sintering dan waktu tahan sintering terhadap densitas dan kekerasan pada Mmc W-Cu melalui proses metalurgi serbuk, Vol. 1, No.1.

A. S. Alfauzi, A. Purnomo, B. Tjahjono, Hariyanto dan N. Sa’adah, 2019. Pembuatan Roda Gigi dari Bahan Serbuk Logam Tembaga dan Alumunium dengan Proses Kompaksi, Jurnal Rekayasa Mesin, 14, 121-127.

X. Li, M. Sosa, M. Andersson and U. Olofsson, 2016, A study of the efficiency of spur gears made of powder metallurgy materials – ground versus super-finished surfaces, Tribology International, volume 95, pp.211-220.

E. Malkoc, J. Hazard and Mater, 2007. Removal of Cromium (Cr) from Wastewater. Arabian Journal. pp 142-219.

M.I. Zulkarnain dan R. Nopiandi, 2013. Rancang Bangun Cetakan Roda Gigi Lurus Berbasis Metalurgi Serbuk Tanpa Lubang Poros. Bandung.

M.P. Groover, 2010. Fundamental of Modern Manufacturing, (USA: 4th Edition).

S. Mushtaq and M.F. Wani, 2017, The study of microhardness of powder metallurgy fabricated Fe-Cu alloy using vickers indenter, Advanced Materials Proceedings, 2(4), 259-263.


  • There are currently no refbacks.

Copyright of JTM (p-ISSN: 2089-4880   e-ISSN:2598-8263)