Boron nitride (BN) is a crystalline material. It has two different crystal forms, hexagonal and cubic. The hexagonal form is softer than diamond and exhibits superior stability.
H-BN is a promising material for lubricant applications. This lubricant has high thermal conductivity, chemical stability, and good anti-wear properties. It also has good water resistance. However, the use of BN is still limited.
The boron nitride lubricant can be used for oil-free bearings, metal wire drawing lubricants, and self-lubricating powder metallurgy products. Moreover, BN can be used as release agent for sheet glass processing.
In addition, BN is relatively stable to organic solvents. This is helpful in the formulation of lubricant oils. It can be applied in various industries such as automobile manufacturing, sheet glass processing, and other manufacturing processes. Besides, BN lubricants are non-corrosive and have strong load capacity. With the development of environmental issues globally, lubricant materials that have good environmental performance are in demand.
In the 1990s, researchers tested h-BN as a lubricant additive. They found that BN was better than MoS2 but inferior to graphite. BN’s lubricating mechanism is similar to that of graphite. But it is not suitable for lubrication in dirty environments.
Today, BN has undergone a series of studies to evaluate its suitability as a lubricant. These studies have helped to develop a better understanding of the lubricant’s properties and the effect of h-BN. Currently, h-BN has four varieties.
BN’s tribological properties have been shown to improve with the addition of h-BN. Specifically, the coefficient of friction was reduced from 0.3 to 0.4 to 0.1.