Significance of Boron Nitride in Composites and Its Applications

Abstract

Boron nitride (BN) exists in several polymorphic forms such as a-BN, h-BN, t-BN, r-BN, m-BN, o-BN, w-BN, and c-BN phases. Among them, c-BN and h-BN are the most common ceramic powders used in composites to ensure enhanced material properties. Cubic boron nitride (c-BN) has exceptional properties such as hardness, strength than relating with other ceramics so that are most commonly used as abrasives and in cutting tool applications. c-BN possesses the second highest thermal conductivity after diamond and relatively low dielectric constant. Hence pioneer preliminary research in AMCs proven substitute composites than virgin AA 6061 traditionally used for fins in heat sinks. Moreover, poly-crystalline c-BN (PCBN) tools are most suitable for various machining tasks due to their unmatchable mechanical properties. h-BN also finds its own unique applications where polymer composites for high temperature applications and sp 3 bonding in extreme temperature and compression conditions.

Thermal behavior and dielectric response of epoxy–boron nitride composites reinforced with short human hair fiber

“…Among all these polymorphs, the h‐BN is the most stable as well as the softest crystalline form with a similar layered structure of graphite crystals. [ 34 ] h‐BN particles possess low dielectric constant, high thermal conductivity (highest among all electrical insulators), low thermal expansion, and chemical inertness, which make it a promising filler material in polymer matrix composite. [ 28 ] The pictorial view and a SEM micrograph of micro‐sized BN powder used in this work are given in Figure 2.…”

Enhancement of microstructural, mechanical and tribological properties of hybrid Al- CNTs through electroless deposition of innovative h-BNs contents coated Ag and Ni for purpose of ball bearing

“…Additionally, at this specific concentration, the detrimental effects associated with excessive h-BN agglomeration and porosity are mitigated, contributing to the observed optimal compressive strength. The diminished compressive strength observed in the sintered specimens with a 10 wt.% h-BN content can be attributed to a confluence of factors, including porosity, the agglomeration of h-BN within the aluminum matrix, the degree of anisotropy exhibited by h-BN grains in a specified direction, the multi-dimensional spatial distribution of these components, and the resultant imposition of multi-axial stresses, as elaborated in reference [39,40,43,50,56].…”

“…The self-lubrication of h-BN is particularly advantageous in applications where traditional liquid lubricants face limitations, such as in hightemperature environments or vacuum conditions [33][34][35]. According to the literature survey, it is evident that researchers have not investigated the impact of adding h-BN to create Al/CNTs/h-BN hybrid composites, combining the advantages of CNTs [8,[16][17][18][19]28,[36][37][38].and h-BN [10,34,35,[39][40][41][42][43]in the Al-matrix. This combination makes the material wellsuited for automotive, and industrial applications.…”

Few-Layered Hexagonal Boron Nitride: Functionalization, Nanocomposites, and Physicochemical and Biological Properties

“…Just like carbon, it occurs in amorphous and crystalline forms. The major crystalline forms are hexagonal boron nitride (h-BN) compared to graphite, sphalerite boron nitride (β-BN) similar to cubic diamond, and rhombohedral (r-BN) and wurtzite boron nitride (γ-BN), which is in hexagonal diamond form [3,[8][9][10]. Boron nitride nanotubes (BNNT) are also known.…”