Boron nitride is an extremely durable material with excellent thermal stability at high temperatures and chemical resistance – reacting with few substances. Hexagonal boron nitride crucibles are simple to use and frequently used for high-temperature experiments involving nonferrous and ferrous metals, ceramics, and rare earth materials. Unfortunately, they’re vulnerable to moisture absorption so should only be placed in dry environments.
Excellent Thermal Stability
Boron nitride’s exceptional thermal stability makes it an excellent material for crucibles. Its resistance to chemical attack makes it particularly useful when handling high-temperature materials such as molten salts. Furthermore, its low coefficient of expansion means it won’t expand or contract at high temperatures – an advantage in applications requiring precise temperature regulation like crystal growth or semiconductor manufacturing.
Boron nitride’s chemical composition consists of equal parts nitrogen and boron. This material comes in various forms, with hexagonal BN (H-BN) being the softest polymorph. H-BN is often used as a lubricant or ingredient in cosmetic products; cubic boron nitride (CBN) variety being soft like diamond, while rarer variants like W-BN may have similarity with lonsdaleite but be harder than CBN.
Hexagonal boron nitride’s hexagonal structure, similar to graphite, lends it excellent machinability and low-friction properties, as well as corrosion resistance for acid and alkali solutions, strong electrical insulation properties and temperature tolerance of up to 1800 degrees Celsius, making it a versatile material used across numerous applications including semiconductor manufacturing, glass melting and powder metallurgy.
Boron nitride stands out among materials due to its exceptional thermal stability, non-wettability, microwave transparency and chemical nonreactivity – qualities which make it suitable for microwave applications as well as use with sensitive chemicals.
High Electrical Insulation
Boron nitride is electrically insulating, making it the perfect material for use as crucibles. This feature allows it to prevent unwanted electrochemical reactions during operations that require precise control of temperature profiles, such as crystal growth and materials synthesis, while still remaining intact when exposed to sudden temperature shifts, such as those experienced during melting metals.
Hexagonal boron nitride shares its structure with graphite, making it suitable for precision milling into virtually any desired form. Furthermore, it exhibits excellent thermal conductivity properties and can withstand high temperatures without cracking under pressure.
Chemical processing applications that utilize carbon fibre have taken advantage of its versatility by employing it in various corrosive environments without degraded integrity, while its low coefficient of thermal expansion enables rapid temperature changes without distortion to finished sintered parts.
This crucible contains high purity boron nitride with minimal impurities and contaminants. Furthermore, its non-toxicity means no risk to personnel or the environment and allows for easy handling and disposal without special precautions or waste management requirements.
Boron nitride’s high operating temperature and thermal shock resistance make it suitable for use in a range of high-temperature applications, such as ceramic melting, silicate melts and metal smelting. Furthermore, high heat is often required when sintering ceramics or other materials.
boron nitride crucibles can withstand temperatures of up to 2,000degC without warping or deforming, making it an excellent choice for furnaces and other equipment operating at such extreme temperatures. Furthermore, its moisture resistance allows it to be used under various conditions; however it should be noted that due to its susceptibility to moisture absorption it should not be stored in wet environments or washed with water; instead it can be directly wiped down with sandpaper or scrubbed with alcohol in order to extend its use life and enhance its performance.
Excellent Machinability
Boron nitride is a versatile ceramic material, capable of being machined into complex forms with tight tolerances. This makes it suitable for fabrication into components ranging from crucibles and furnace bells to thermocouples. Plus, its low coefficient of thermal expansion makes it suitable for applications requiring precise temperature regulation such as crystal growth or materials synthesis.
Boron nitride stands out among ceramics as it does not react negatively with liquid metals; thus making it suitable for creating crucibles for metal melting or powder gas atomization processes. Furthermore, this ceramic will not react with glass surfaces and does not dissolve easily in most solvents.
Boron nitride stands out due to its chemical inertness, which prevents any electrochemical reactions between its substrate and crucible’s inner wall, thus avoiding unwanted contamination of both reaction and product. This benefit is especially relevant when working with sensitive materials like semiconductors where proper container lining ensures integrity of final products.
boron nitride crucibles offer another advantage with their superior thermal shock resistance. When compared with other crucible liners such as alumina, boron nitride can withstand much higher temperatures allowing it to withstand rapid temperature changes during sintering or crystallization processes.
Boron nitride’s high temperature stability provides added assurance that its crucible won’t be damaged by sudden fluctuations in ambient temperature, something which would normally result in cracks or breakage to its liner. Furthermore, its superior thermal shock resistance extends even to its nozzles which can withstand up to 2100 degrees Celsius without cracking.
High Corrosion Resistance
boron nitride crucibles stand out as key components in metal melting, ceramic sintering and other high-temperature processes because they offer resistance against corrosion and chemical reactions, helping ensure no contaminants enter molten materials during these processes. Furthermore, their machinability allows the creation of precise-shaped crucibles which offer additional corrosion protection.
Boron nitride does not react with many substances and exhibits excellent non-wetting properties, making it an ideal material for metal smelting as it can safely hold and melt most nonferrous and ferrous metals including titanium, zirconium, molybdenum, tungsten iron nickel and aluminium. Hexagonal boron nitride also exhibits good thermal stability with low coefficient of friction making hexagonal boron nitride an excellent lining material choice.
Hexagonal boron crucibles are ideal for melting metals at temperatures up to 2100 degC without experiencing significant structural changes, and are highly resistant to corrosion by most metallic compounds and non-metals such as silicon, magnesium, aluminium oxide calcium fluoride barium fluoride etc. Additionally boron nitride offers superior electrical insulation properties and should be considered when high temperature thermal insulation insulation applications arise.
Great Ceramic offers a selection of boron nitride ceramic crucibles, such as hexagonal boron nitride (H-BN), which makes an excellent replacement for graphite in many applications. H-BN features excellent heat resistance and chemical stability as well as being resistant to erosion from most molten metals as well as being an exceptional self-lubricator with high temperature dielectric strength insulators.
boron nitride crucibles can be used for ceramic melting, silicate melting and metal smelting as well as crystal growth and thermal analysis. Crafted from high purity boron nitride with minimal impurities, these durable vessels can withstand temperatures up to 2000 degC for materials research projects, metallurgy projects and ceramic sintering applications. Care is taken during storage and transportation to minimize damage. With various shapes and sizes to suit various applications BN crucibles come highly recommended.