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Boron Nitride Powder-A High-Performance Alternative for Solid Lubrication

Publisher: GE Advanced Materials
Overview:
Hexagonal boron nitride - (h)BN powder's applications as a high performance solid lubricant are described in this paper including its high-temperature stability, low coefficient of friction, extreme pressure performance, high thermal conductivity, high electrical resistivity, inertness in a variety of chemical environments and environmental friendliness. Key material properties of (h) BN powder are listed, detailing the process of synthesizing BN, while results of tests on the extreme pressure characteristics of BN and its co efficient of friction are presented in the form of graphs and tabular data. Lubrication uses of (h)BN are explained, providing tabular data detailing microhardness and wear resistance of Nickel-Boron Nitride Composite coatings, and taber wear index of Ni-BN Composites. Environmental issues related to the use of (h)BN for lubrication applications are covered as well.
TABLE OF CONTENTS
1.What is Boron Nitride?1
2.Coefficient of Friction1
3.Four-Ball Extreme Pressure Test1
4.A Variety of (h)BN Powders2
5.Thermal Stability2-3
6.Lubrication Uses of (h)BN3
7.Dispersions in Oils, Water and Greases3
8.Electrodeposition/Electrocomposites3
9.Plasma/Thermal Spray Coatings3
10.Polymer Composites4
11.Environmental Issues4
12.Appendix4
12.1A. Falex Coefficient of Friction Test4
12.2B. Falex 4-Ball Extreme Pressure Test4
13.Summary4
14.Figures
14.1Figure 11
14.2Figure 2-Variations of (h)BN2
14.3Figure 3-Typical Properties of Various Grades of (h)BN Powders2
14.4Figure 4-Coefficient of Friction at Various Temperatures2
15.Tables
15.1Table 1. Base Fluid Properties4< BR>
15.2Table 21
15.3Table 3 Coefficient of Friction3
15.4Table 4 Microhardness and Wear Resistance of Nickel and Nickel-Boron Nitride Composite Coatings3
15.5Table 5 Taber Wear Index of Ni-BN Composites3
15.6Table 64
16.Photos
16.1Photo 12
16.2Photo 22
16.3Photo 32
16.4Photo 42
16.5Photo A14
16.6Photo A24
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