Accession Number : ADD011622

Title :   Method of Preparing Nonlaminating Anisotropic Boron Nitride.

Descriptive Note : Patent Application,

Corporate Author : DEPARTMENT OF THE ARMY WASHINGTON DC

Personal Author(s) : Branovich,L E ; Smith,B ; Freeman,G L

Report Date : 22 Mar 1985

Pagination or Media Count : 7

Abstract : The general object of this invention is to provide a method of preparing non laminating anisotropic boron nitride. A further object is to provide such a method wherein the resulting non laminated anisotropic boron nitride will form a strong bond and hold together. A still further object of the invention is to provide such a method wherein the resulting non laminated anisotropic boron nitride will be suitable for use in microwave and millimeter wave devices. It has now been found that the aforementioned objects can be attained by adding small amounts of a volatile oxygen containing compound such as alcohol, an oxygen containing boron compound, or water to the reaction of ammonia with the boron halide. The amount of volatile oxygen containing compound added must be sufficient to prevent lamination yet small enough to prevent the finalized product from losing its anisotropy. The amount is less than 500 parts per million reactants. According to the method of the invention, the degree of anisotropy will be a function of the amount of volatile oxygen containing compound present. Similarly, the degree of lamination will also be a function of the amount of volatile oxygen containing compound added to the reaction. (Author).

Descriptors :   *PATENT APPLICATIONS, *BORON NITRIDES, MICROWAVE EQUIPMENT, ALCOHOLS, CHEMICAL REACTIONS, AMMONIA, ANISOTROPY, OXYGEN, VOLATILITY, MILLIMETER WAVES

Subject Categories : Industrial Chemistry and Chemical Processing
      Electrical and Electronic Equipment

Distribution Statement : APPROVED FOR PUBLIC RELEASE