Production of boron nitride

• US 4,913,887 A
• Filed: 08/22/1984
• Issued: 04/03/1990
• Est. Priority Date: 04/15/1982
• Status: Expired due to Fees

• Current Assignee: National Institute for Research in Inorganic Materials
• Original Assignee: National Institute for Research in Inorganic Materials
• Inventors: Ishii, Toshihiko, Sato, Tadao
• Primary Examiner(s): Doll, John
• Assistant Examiner(s): BRENEMAN, ROBERT B
• Application Number:
  US06/642,717
• Time in Patent Office: 2,050 Days
• Field of Search: 423/290
• US Class Current: 423/290
• CPC Class Codes: B01J 6/00 Heat treatments such as Calcining; Fusing ; Pyrolysis furnaces F27D
• CPC Class Codes: C01B 21/064 with boron
• CPC Class Codes: C01P 2002/72 by d-values or two theta-values, e.g. as X-ray diagram
• CPC Class Codes: C01P 2002/88 by thermal analysis data, e.g. TGA, DTA, DSC

Abstract

A process for producing boron nitride comprises heating a mixture consisting of borohydride of alkali metal and ammonium chloride at a temperature range of from 800° to 2200° C. in a non-oxidizing atmosphere.

Claims

1. A process for producing amorphous boron nitride, substantially free from hexagonal system boron nitride and oxygen, which comprises heating a mixture consisting of a borohydride of an alkali metal and ammonium chloride at a temperature within a range of from 800°

to 1100°

C. in a non-oxidizing atmosphere.

2. The process for producing boron nitride according to claim 1, wherein said borohydride of alkali metal and ammonium chloride is mixed in such a ratio that nitrogen is in an equivalent or greater quantity in a molar ratio with respect to boron.

3. The process according to claim 1 wherein said alkali metal borohydride is LiBH₄, NaBH₄, or KBH₄.

4. The process for producing amorphous boron nitride according to claim 1, wherein said non-oxidizing gas is nitrogen gas, ammonia gas or argon gas.