Tribological Performance of a Polymer Blend of NBR Used for Stern Bearings
Qin Hongling*, 1, 2, 3, Zhou Xincong1, 2, Xu Chuntao1, 2, Wang Hao1, 2, Liu Zhenglin1, 2
Identifiers and Pagination:Year: 2012
First Page: 133
Last Page: 139
Publisher Id: TOMEJ-6-133
Article History:Received Date: 13/6/2012
Revision Received Date: 15/10/2012
Acceptance Date: 15/10/2012
Electronic publication date: 28/12/2012
Collection year: 2010
open-access license: This is an open access article distributed under the terms of the Creative Commons Attribution 4.0 International Public License (CC-BY 4.0), a copy of which is available at: (https://creativecommons.org/licenses/by/4.0/legalcode). This license permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Nitrile-butadiene rubber (NBR) and another polymer with an excellent self-lubricating property are blended to develop a new kind of polymer used for water-lubricated stern bearings. The tribological performance of the new Polymer Blend of NBR (PBN), with the comparison of a rubber common used for most stern bearings, was studied using a stern bearing test rig of SSB-100. The results showed that the friction coefficients of PBN are lower than those of NBR under water-lubricated conditions. And the difference is the most evident at speeds of 0.1 ~ 2.0m/s. So PBN will change to Plasto-Elastohydrodynamic (PEH) Lubrication at lower speed to reduce the critical speed of bearing squeal. This indicates blending rubber with other polymers is an effective means to develop low-friction stern bearing materials. Furthermore, test results revealed that reducing the rubber layer thickness and hardness will reduce the friction coefficients. So in the structure design of water-lubricated rubber bearings, selecting proper structural parameter will improve the tribological performance.