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{{Short description|Refractory compound of boron and nitrogen with formula BN}}
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=== Mechanical properties ===
BN nanosheets consist of hexagonal boron nitride (h-BN). They are stable up to 800°C in air. The structure of monolayer BN is similar to that of [[graphene]], which has exceptional strength.<ref name=":0">{{Cite journal |
The anisotropy of Young's modulus and [[Poisson's ratio]] depends on the system size.<ref>{{Cite journal |
==Natural occurrence==
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h-BN has been used since the mid-2000s as a bullet and bore lubricant in precision target rifle applications as an alternative to [[molybdenum disulfide]] coating, commonly referred to as "moly". It is claimed to increase effective barrel life, increase intervals between bore cleaning and decrease the deviation in point of impact between clean bore first shots and subsequent shots.<ref>{{cite web | url = http://bulletin.accurateshooter.com/2014/09/hexagonal-boron-nitride-hbn-how-well-does-it-work/ | title = Hexagonal Boron Nitride (HBN)—How Well Does It Work? | author = <!--Staff writer(s); no by-line.--> | date = 8 September 2014 | website = AccurateShooter.com | access-date = 28 December 2015}}</ref>
h-BN is used as a release agent in molten metal and glass applications. For example, [[ZYP Coatings (company)|ZYP Coatings]] developed and currently produces a line of paintable h-BN coatings that are used by manufacturers of molten aluminium, non-ferrous metal, and glass.<ref>{{Cite web|url=http://www.colourdeverre.com/img/projects/advancedpriming.pdf|title=colourdeverre.com/img/projects/advancedpriming.pdf}}</ref> Because h-BN is nonwetting and lubricious to these molten materials, the coated surface (i.e. mold or crucible) does not stick to the material.<ref>{{Cite web|url=https://www.researchgate.net/publication/234787198|title=
===Cubic BN===
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Zirconia Stabilized Boron Nitride (ZSBN) is produced by adding [[zirconia]] to [[Boron nitride | BN]], enhancing its thermal shock resistance and mechanical strength through a [[sintering]] process.<ref>{{cite web |url=https://www.preciseceramic.com/blog/boron-nitride-variants-pbn-hbn-cbn-zsbn.html |title=Diverse Classification Factors of Boron Nitride and Their Correlation with PBN, HBN, CBN, and ZSBN Variants
|last=Lisa |first=Ross |website=Precise Ceramics |access-date=June 8, 2024}}</ref> It offers better performance characteristics including Superior [[corrosion]] and [[erosion]] resistance over a wide temperature range.<ref>{{cite book |author=<!-- Not Stated --> |title=New Steel: Mini & Integrated Mill Management and Technologies |date=1996 |publisher=Chilton Publishing |pages=
===Pyrolytic boron nitride (PBN)===
Pyrolytic boron nitride (PBN), also known as [[Chemical vapor deposition|Chemical vapour-deposited]] Boron Nitride(CVD-BN),<ref>{{cite web |url=https://www.preciseceramic.com/blog/introduction-of-pyrolytic-boron-nitride-pbn.html |title=About Pyrolytic Boron Nitride |last=Rose |first=Lisa |website=Precise Ceramic |access-date=May 31, 2024}}</ref> is a high-purity [[ceramic]] material characterized by exceptional chemical resistance and mechanical strength at high temperatures.<ref>{{cite web |title=Pyrolytic Boron Nitride (PBN) |url=https://www.shinetsu.co.jp/en/products/electronics-materials/pyrolytic-boron-nitride-pbn/ |website=Shin-Etsu Chemical Co., Ltd. |access-date=May 31, 2024}}</ref>
Pyrolytic boron nitride is typically prepared through the thermal decomposition of [[boron trichloride]] and [[ammonia]] vapors on [[graphite]] substrates at 1900°C.<ref>{{cite journal |last1=Moore |first1=A. |title=Compression Annealing of Pyrolytic Boron Nitride |journal=Nature |volume=221 |pages=1133–1135 |date=1969-03-22 |issue=5186 |doi=10.1038/2211133a0 |bibcode=1969Natur.221.1133M |url=https://www.nature.com/articles/2211133a0 |access-date=May 31, 2024}}</ref>
Pyrolytic boron nitride (PBN) generally has a hexagonal structure similar to hexagonal boron nitride (hBN), though it can exhibit stacking faults or deviations from the ideal lattice.<ref>{{cite web |title=An Overview of Pyrolytic Boron Nitride (PBN) |url=https://www.sputtertargets.net/an-overview-of-pyrolytic-boron-nitride-pbn.html |website=Sputter Targets |access-date=May 31, 2024}}</ref> Pyrolytic boron nitride (PBN) shows some remarkable attributes, including exceptional chemical inertness, high [[dielectric]] strength, excellent thermal shock resistance, non-wettability, non-toxicity, oxidation resistance, and minimal [[outgassing]].
<ref>{{cite journal |last1=Lipp |first1=A. |last2=Schwetz |first2=K.A. |last3=Hunold |first3=K. |title=Hexagonal boron nitride: Fabrication, properties and applications |journal=Journal of the European Ceramic Society |volume=5 |issue=1 |pages=
Due to a highly ordered planar texture similar to pyrolytic graphite (PG), it exhibits anisotropic properties such as lower [[dielectric]] constant vertical to the [[crystal]] plane and higher bending strength along the [[crystal]] plane.<ref>{{cite journal |last1=Rebillat |first1=F. |last2=Guette |first2=A. |title=Highly ordered pyrolytic BN obtained by LPCVD |journal=Journal of the European Ceramic Society |volume=17 |issue=12 |pages=
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