Research on lubricity of oils containing the hexagonal boron nitride
Journal Title: Bulletin of the Military University of Technology - Year 2019, Vol 68, Issue 1
Abstract
The paper presents the test results of lubricity properties of Hydrol L-HL 32 hydraulic oil, Mobilube 1 SHC 75w-90 gear oil, and two base oils: SN-150 and SN-650, containing hexagonal boron nitride. To conduct the required tests, a four ball machine was used. This device is commonly used when assessing lubricity properties of oils and greases. The following normative lubricity parameters were defined: the value of welding point Pz [daN], the value of last non-seizing load Pn [daN], the value of seizing at smoothy growing load Pt [daN], as well as the wear limiting capacity load Goz [daN/mm2]. Furthermore, several non-normative tests were completed that covered indication of two parameters making it possible to complete an assessment of lubricity properties of oils. Based on the tests, it was determined that hexagonal boron nitride is a good additive that improves lubricity properties. Improvement in the above properties was recorded both in the case of hydraulic oil and gear oil, as well as oil bases. Relatively better improvement results were obtained in the case of oil bases, where the improvement in the results after using boron nitride, was more visible than in the case of hydraulic and gear oil. The best improvement results for hydraulic oil were obtained after adding 4% h-BN, whereas in the case of the SN-150 oil base, this value was 2% h-BN. The best improvement results for gear oil and SN-650 oil base were also obtained after adding 4% h-BN. The possibility of using the values of h-BN bigger than 4% was excluded. It was determined that bigger content of h-BN in oil generates negative effects (under four ball conditions). Keywords: tribology, lubricity, boron nitride.<br/><br/>
Authors and Affiliations
Szymon Senyk, Maciej Perehubka, Tadeusz Kałdoński
Evaluation of time change of the Love k2 and k3 numbers using LAGEOS SLR data
In this paper, we present the estimated Love numbers for degree 2 and 3 (k2 and k3). The determination was based on the Satellite Laser Ranging (SLR) data of LAGEOS-1 and LAGEOS-2 satellites obtained within the period of...
Models of diagnostic relations in a wheeled tractor
Modern wheeled tractors are equipped with new-generation electric and electronic systemswhich control the operation of actuator systems. Such solutions require an on-board computer foronline monitoring of functional perf...
Bilansowanie hierarchicznej struktury zasobów w planowaniu przedsięwzięć inżynieryjno-budowlanych
W artykule podjęto problem rozdziału i bilansowania hierarchicznej struktury zasobów w planowaniu realizacji przedsięwzięć inżynieryjno-budowlanych. W sposób syntetyczny opisano istotę hierarchicznej struktury zasobów or...
Kompozyty ciekłokrystaliczne do punktowych pomiarów temperatury
Zastosowanie cholesterycznych ciekłych kryształów i kompozytów je zawierających do wizualizacji pól cieplnych i pomiaru temperatury jest dobrze znane. Niezależnie od niedogodności, jakimi są ograniczona precyzja i adhezj...
Graphic keypad in intrusion alarm systems
Intrusion and hold-up alarm systems (Is & HAS for short, also known as burglary and robbery systems) can be classified as belonging to the group of electronic security systems. Intruder alarm systems (IAS for shat) are i...