Boron nitride reaction capsule/vessel

Abstract

A graphite capsule / vessel for producing boron nitride. The vessel has a cross-sectional area that allows reaction contents to be uniformly heated in order to yield boron nitride in a uniform consistency of crystallinity and purity and allows the reaction gaseous products to readily evolve.

Description

TECHNICAL FIELD [0001] This invention relates to a graphite container for producing boron nitride in high-temperature reaction processes. BACKGROUND ART [0002] This invention relates to a graphite capsule / vessel container for the reaction to produce boron nitride in a uniform consistency of crystallinity and purity. Typical reaction vessels for manufacturing boron nitride are very large graphite “pot” containers which produce a non-uniform product throughout. The large “pot” containers can be heated by induction heating or resistance heating, and have been selected due to their ability to produce a large, economical quantity of the boron nitride reaction product. The graphite “pot” is typically several feet in diameter and several feet deep. [0003] Boron nitride batch production processes are well known in the art, typically involving reaction of boric acid, borates, or boron oxides or the like with ammonia gas or with nitrogen-containing compounds such as melamine, urea, dicyandiam...

AI Technical Summary

Benefits of technology

"The present invention is about a new way to make boron nitride. It involves using a special container made of graphite that allows for the production of consistent and pure boron nitride. This is achieved by controlling the size and thickness of the container so that the graphite is heated evenly and the gas species that react with the graphite or the forming boron nitride are prevented from causing any negative reactions. Overall, this method results in a high-quality, single-grade boron nitride product."

Problems solved by technology

Typical reaction vessels for manufacturing boron nitride are very large graphite “pot” containers which produce a non-uniform product throughout.

The problem with this solution is that the chunks of porous “popcorn” after being busted up tend to pack much more tightly and thus keep much of the material that needs to evolve from doing so.

The above process is the standard for the boron nitride industry and no solution for these problems has been possible.

Attempts to reduce the size of the reaction pot result in poor overall boron nitride volume-of-material yields and generally poor end-purity due to increasing the contact area with the graphite container used for the reaction.

Such oddball particle distributions and residuals have to be sold for economics of the process, leading to industry-wide problems with finding users of such strange particle size distributions.

Images