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Title: Fabrication of boron articles

This invention is directed to the fabrication of boron articles by a powder metallurgical method wherein the articles are of a density close to the theoretical density of boron and are essentially crackfree. The method comprises the steps of admixing 1 to 10 weight percent carbon powder with amorphous boron powder, cold pressing the mixture and then hot pressing the cold pressed compact into the desired article. The addition of the carbon to the mixture provides a pressing aid for inhibiting the cracking of the hot pressed article and is of a concentration less than that which would cause the articles to possess significant concentrations of boron carbide.
Inventors:
 [1]
  1. (Knoxville, TN)
Issue Date:
OSTI Identifier:
862623
Assignee:
United States of America as represented by United States Energy (Washington, DC) ORNL
Patent Number(s):
US 3976735
Contract Number:
W-7405-ENG-26
Research Org:
UNION CARBIDE CORP
Country of Publication:
United States
Language:
English
Subject:
fabrication; boron; articles; directed; powder; metallurgical; method; density; close; theoretical; essentially; crackfree; comprises; steps; admixing; 10; weight; percent; carbon; amorphous; cold; pressing; mixture; hot; pressed; compact; desired; article; addition; provides; inhibiting; cracking; concentration; possess; significant; concentrations; carbide; cold pressing; percent carbon; cold pressed; amorphous boron; hot pressed; theoretical density; boron carbide; method comprises; weight percent; hot pressing; powder metallurgical; carbon powder; boron powder; possess significant; method comprise; hot press; desired article; significant concentration; boron articles; /264/376/976/