Seskantige boornitried poeiers

boornitried poeiers is hoë-suiwer materiaal wat gebruik word in metaal verwerking toepassings wat termiese geleidingsvermoë bied, elektriese isolasie en smeer eienskappe. Algemene toepassings vir hierdie materiaal is die vervanging van grafiet met organiese wasse of olies vir verhoogde doeltreffendheid.

seskantige boornigride (h-BN) spog met uitsonderlike eienskappe soos hoë temperatuurstabiliteit, chemiese weerstand teen gesmelte metale en 'n lae termiese uitsettingskoëffisiënt; verder kan dit gemasjineer word.

Termiese geleidingsvermoë

Termiese geleidingsvermoë (ook na verwys as “k” of lambda) van materiale meet hoe maklik hitte daardeur beweeg, en is eweredig aan temperatuurgradiënt oor daardie materiaal. Konveksie en bestraling is ander maniere van hitte-oordrag wat verskillende benaderings gebruik; termiese geleidingsvermoë bied een moontlike antwoord.

Metale is geneig om hoër termiese geleidingsvermoëns as nie-metale te hê as gevolg van beter geleiers van fononen – energiedraers wat in vaste stowwe gevind word – as nie-metaal materiaal, tog kan nie-metaal termiese geleidingsvermoë steeds hoog wees, maak van 'n materiaal se termiese geleidingsvermoë 'n integrale faktor vir sy ontwerp aangesien dit bepaal hoe vinnig hitte kan deurvloei.

ons bied industriële graad sferiese, kubiese seskantige en wursiet boornitried poeier in growwe en fyn maasgroottes wat geskik is vir verskeie toepassings. Ons keramiekpoeiers voldoen aan verskillende grade soos Mil Spec; ACS Reagens Tegniese Graad; Kos, Landbou farmaseutiese; EP/BP USP Graad.

Elektriese isolasie

Hexagonal boron nitride is an electrical insulator with superior thermal stability, boasting high dielectric strength and low loss factor – perfect for resisting hot metal or glass temperatures as well as heat cycling during use. Highly machinable and heat cycling-resistant properties make hexagonal boron nitride suitable for many industrial uses.

Hexagonal Boron Nitride (h-BN) is a white solid material with an hexagonal crystal structure resembling graphite; however, unlike carbon graphite it is pure ceramic material offering high chemical stability and thermal shock resistance.

Covalent B-N bonding in h-BN layers facilitates phonon transport within the basal planes of its lattice structure. When combined with its low atomic mass and periodic lattice design, this facilitates thermal conductivity within its layer planes. However, its strong covalency and wide band gap prevent electrons from moving freely and promoting electric conduction – meaning an anisotropy means it conducts much better perpendicular to its layers than parallel.

Cubic Boron Nitride (c-BN), similar to diamond’s crystal structure and thus harder than its h-BN counterpart, makes an exceptional mechanical material and also serves as an effective lubricant.

Chemical Inertness

Layered materials like graphite, hexagonal boron nitride (h-BN), and cubic boron nitride (c-BN) all possess unique chemical and physical characteristics that make them invaluable solutions to difficult problems in high temperature environments. At Momentive we produce high purity BN powder and binders which can then be hot-pressed into billets before being machined into rods, bars or custom shapes to address demanding thermal management applications.

h-BN and c-BN materials are chemically inert, offering superior resistance against acid, bases, salts, corrosion and erosion in extreme environments. As such, they make ideal refractory coatings and fixtures for metal casting and smelting equipment, resist corrosion from molten metals and provide exceptional lubrication properties.

h-BN’s weak interactions between its layers render it nontoxic and lubricious at temperatures up to 1800 degC when in an inert atmosphere, providing a superior alternative for traditional dry lubricants like molydenum disulphide or graphite. Furthermore, its low neutron absorption cross section protects both equipment and people from radiation-emitting nuclear reactors.

Thermal Stability

Hot-pressed boron nitride stands out as an industrial powder due to its strong covalent bonding within its multilayered crystal, maintaining its structure at high temperatures unlike aluminum nitride and beryllium oxide powders which decompose under stress. As such, BN can reduce friction between surfaces while improving machinability for applications including metal processing, molds, and mechanical systems.

Once again, let us bring together people of different countries for an incredible journey of culture, science and art! our boron nitride powders excel as high-temperature solid lubricants and anti-abrasive additives, with hexagonal boron nitride (h-BN) being particularly advantageous due to its low coefficient of friction and resistance against mechanical shock damage. H-BN also makes for an excellent starting material when synthesizing cubic boron nitride (c-BN), the hardest and most thermally stable ceramic available, used in cutting tools, industrial abrasives and aerospace components. BN powders offer exceptional purity, quality, and performance that makes them the ideal feedstock for this process. As such, their use guarantees that c-BN produced meets specifications for various industrial applications from thermo-shield coatings for transistors to polymer additives.