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Title: Boron containing multilayer coatings and method of fabrication

Hard coatings are fabricated from multilayer boron/boron carbide, boron carbide/cubic boron nitride, and boron/boron nitride/boron carbide, and the fabrication thereof involves magnetron sputtering in a selected atmosphere. These hard coatings may be applied to tools and engine and other parts, as well to reduce wear on tribological surfaces and electronic devices. These boron coatings contain no morphological growth features. For example, the boron and boron carbide used in forming the multilayers are formed in an inert (e.g. argon) atmosphere, while the cubic boron nitride is formed in a reactive (e.g. nitrogen) atmosphere. The multilayer boron/boron carbide, and boron carbide/cubic boron nitride is produced by depositing alternate layers of boron, cubic boron nitride or boron carbide, with the alternate layers having a thickness of 1 nanometer to 1 micrometer, and at least the interfaces of the layers may be of a discrete or a blended or graded composition.
Inventors:
 [1];  [1]
  1. (Livermore, CA)
Issue Date:
OSTI Identifier:
871154
Assignee:
Regents of University of California (Oakland, CA) LLNL
Patent Number(s):
US 5670252
Contract Number:
W-7405-ENG-48
Research Org:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Country of Publication:
United States
Language:
English
Subject:
boron; containing; multilayer; coatings; method; fabrication; hard; fabricated; carbide; cubic; nitride; involves; magnetron; sputtering; selected; atmosphere; applied; tools; engine; reduce; wear; tribological; surfaces; electronic; devices; contain; morphological; growth; features; example; forming; multilayers; formed; inert; argon; reactive; nitrogen; produced; depositing; alternate; layers; thickness; nanometer; micrometer; interfaces; discrete; blended; graded; composition; multilayer coatings; magnetron sputter; morphological growth; multilayer coating; magnetron sputtering; cubic boron; boron containing; alternate layers; boron carbide; boron nitride; electronic devices; selected atmosphere; reduce wear; multilayer boron; hard coatings; growth features; electronic device; hard coating; graded composition; depositing alternate; involves magnetron; /428/359/

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