XTL sintyron PBN Pyrolytic Boron Nitride LEC Crucible

The Pyrolytic Boron Nitride LEC crucible is a simple cylindrical crucible used in LEC (liquid-sealed Czochralski) crystal growth facilities.  The LEC method is the main process for growing undoped semi-insulating gallium arsenide single crystals (SI GaAs).  Currently, more than 80% of semiinsulating gallium arsenide single crystals on the market are grown using the LEC method.  The LEC method uses a graphite heater and a PBN crucible, with B203 as a liquid sealant, to grow gallium arsenide crystals in an argon environment of 2MPa.  The main advantages of the LEC process are high reliability, easy growth of long large-diameter single crystals, controllable crystal carbon content, and good semi-insulating properties of the crystal.  The liquid-sealed Czochralski (LEC) technology can grow high-purity, undoped semi-insulating single crystals or polycrystals suitable for direct ion implantation.  PBN has high density and high purity and is becoming a widely used material in vacuum processes.  The CVD process gives this pyrolytic boron nitride a nearly perfect layered structure, resulting in anisotropic thermal conductivity, making it an ideal material for making crystal growth crucibles.

Properties

• High Temperature Resistance: PBN LEC crucibles can withstand extremely high temperatures, usually up to 1800°C or even higher, without significant deformation or damage. This high temperature resistance is crucial in the LEC process, as the growth of single crystals often requires high-temperature environments to melt the raw materials and promote crystal formation.
• Excellent Chemical Stability: They exhibit remarkable chemical stability and are highly resistant to corrosion from various chemicals, including molten metals and fluxes used in the LEC process. This property ensures that the crucible does not react with the materials being processed, maintaining the purity and quality of the single crystals.
• Low Thermal Expansion Coefficient: PBN LEC crucibles have a relatively low thermal expansion coefficient. This means that they can endure rapid temperature changes during the crystal growth process without cracking or deforming easily. It helps to maintain the integrity of the crucible and ensures stable crystal growth.
• High Purity: The material of PBN LEC crucibles is of high purity, typically with a purity level of over 99.99%. This high purity is essential as it minimizes the introduction of impurities into the crystal growth process, resulting in high-quality single crystals with excellent electrical and optical properties.
• Good Electrical Insulation: They possess excellent electrical insulation properties, which is beneficial in the LEC process where precise control of electrical parameters is required. The insulation helps to prevent electrical interference and ensures the stability of the growth environment.

Manufacturing Process

• Chemical Vapor Deposition (CVD): The production of PBN LEC crucibles mainly adopts the CVD process. In this process, gaseous precursors such as boron trichloride (BCl₃) and ammonia (NH₃) are introduced into a reaction chamber. Under high temperature and low pressure conditions, a chemical reaction occurs, resulting in the deposition of boron nitride on a pre-shaped substrate or mold. This method allows for precise control of the thickness and quality of the PBN layer, ensuring the uniformity and reliability of the crucible.
• Post-processing: After the CVD deposition, the crucibles usually undergo post-processing steps such as machining and polishing to achieve the required dimensions and surface finish. These processes ensure that the crucibles fit perfectly into the LEC equipment and provide an optimal surface for crystal growth.

Applications

• Semiconductor Single Crystal Growth: PBN LEC crucibles are widely used in the growth of semiconductor single crystals, such as silicon carbide (SiC), gallium nitride (GaN), and other compound semiconductors. In the LEC process, the crucible holds the molten semiconductor material, and with the help of a seed crystal, single crystals with high crystallographic quality and large diameters can be grown. These single crystals are the basis for manufacturing high-power electronic devices, light-emitting diodes (LEDs), and other semiconductor components.
• Optoelectronic Device Manufacturing: In the production of optoelectronic devices, such as laser diodes and photodetectors, PBN LEC crucibles play a crucial role. The high-quality single crystals grown in these crucibles are used to fabricate the active layers of optoelectronic devices, ensuring their excellent optical and electrical performance.
• Research and Development: PBN LEC crucibles are also essential tools in scientific research related to materials science and crystal growth. They provide a reliable and controllable environment for studying the growth mechanisms of different crystals and exploring new materials with unique properties.

Advantages in the LEC Process

• Improved Crystal Quality: The use of PBN LEC crucibles helps to reduce the occurrence of defects in single crystals, such as dislocations and impurities. This leads to higher-quality crystals with better electrical and optical properties, which is crucial for the performance of semiconductor and optoelectronic devices.
• Enhanced Process Stability: The excellent thermal and chemical properties of PBN crucibles contribute to the stability of the LEC process. They can withstand the harsh conditions of the process without significant changes, ensuring consistent crystal growth and improving the reproducibility of the process.
• Long Service Life: Compared to other types of crucibles, PBN LEC crucibles have a relatively long service life. Their high temperature resistance and chemical stability enable them to be used repeatedly in multiple crystal growth runs, reducing the cost and improving the efficiency of the production process.

Product details

Conclusion

• PBN Crucibles are ideal for high-purity, high-temperature applications in industries like semiconductors, optoelectronics, and aerospace, where chemical inertness and thermal stability are critical.

• Alumina Crucibles are more suitable for general-purpose applications in metallurgy, ceramics, and laboratory settings, where cost and mechanical strength are more important than extreme purity and thermal performance.

Choosing between the two depends on the specific requirements of your application, including temperature, chemical environment, purity, and budget.

The higher cost of PBN crucibles is justified by their superior material properties, complex manufacturing process, and suitability for high-performance applications. In contrast, alumina crucibles are more affordable due to their simpler production process and broader, less demanding applications. For industries requiring extreme purity, thermal stability, and chemical resistance, PBN crucibles are often the only viable option despite their higher price 

Why choose us

    Liling Xingtailong Special Ceramic Co., Ltd Founded in 1997, is an independent R&D and manufacturing enterprise integrating scientific research and production. "Superior quality, preferential price" is our business purpose. The company mainly produces PBN and BN products. Over the years, the company has been deeply involved in development, and has successively obtained (ISO9001, Alibaba's ten-year-old high-quality supplier, China Manufacturing Network certified supplier, high-tech enterprise certification, gold product enterprise certification, ceramic industry AAA credit unit，product ROHS testing certification, and 6 invention patents.      The company has always adhered to the goal of quality survival, innovative development, honest brand, and meticulous and thoughtful after-sales service. Region, product quality and service are highly recognized by customers.   Striving to be Stronger, hard work and progress. The company initiates a professional responsible person model, continuously improves and innovates, and strives to provide each customer with better and more efficient services.   With strong strength, reasonable price and professional service, We has established long-term cooperative relations with large enterprises at home and abroad. "Excellent quality, preferential price" is our business purpose.   We sincerely look forward to cooperating with more domestic and foreign customers and developing together.

Customer feedback

FAQ

FAQ

Why us?
* Professional manufacturer since 1997.
* Strict quality control on production process and tolerance.
* Free samples available
* Customized production based on your drawing or specification
* On-time delivery and reliable support and service
* Inventory available for quick shipment
* We keep confidentiality of all the drawings and business information between us.
Are you a trading company or a manufacturer?
* We are a manufaturer. 
Can you provide the free samples?
* Yes,we can offer free sample if we have it in stock,but the courier fee is to be collected.
Do you accept customized production based our specification?
* Yes,we offer OEM and ODM service. Just send us your drawing if you have it. If you don’t have a drawing, just tell us your idea, we will work out the drawing for you.

What's the delivery time?
* 7 working days for standard products 30 days for customized products. 
What is the MOQ?
* No limit to the quantity. We can offer the best proposal and solutions according to your condition.
What is the payment terms you accept?
* T/T,LC,Western Union,moneygram are acceptable.
How to deal with the faulty?
* Firstly, Our product are produced in strict quality control system and the defective rate will be less than 2%.
If there are problems with the product, we will provide free replacement.

Tags：Ashes Assay Crucible, Clay Crucible, Gold Assay Crucible, Graphite Crucible, Pyrolytic Boron Nitride Crucible