DOE Patents title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Apparatus for coating powders

Abstract

A process and apparatus for coating small particles and fibers. The process involves agitation by vibrating or tumbling the particles or fibers to promote coating uniformly, removing adsorbed gases and static charges from the particles or fibers by an initial plasma cleaning, and coating the particles or fibers with one or more coatings, a first coating being an adhesion coating, and with subsequent coatings being deposited in-situ to prevent contamination at layer interfaces. The first coating is of an adhesion forming element (i.e. W, Zr, Re, Cr, Ti) of a 100-10,000 .ANG. thickness and the second coating or final coating of a multiple (0.1-10 microns) being Cu or Ag, for example for brazing processes, or other desired materials that defines the new surface related properties of the particles. An essential feature of the coating process is the capability to deposit in-situ without interruption to prevent the formation of a contaminated interface that could adversely affect the coating adhesion. The process may include screening of the material to be coated and either continuous or intermittent vibration to prevent agglomeration of the material to be coated.

Inventors:
 [1];  [1];  [2];  [1]
  1. Livermore, CA
  2. Tracy, CA
Issue Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
OSTI Identifier:
873387
Patent Number(s):
6149785
Assignee:
Regents of University of California (Oakland, CA)
Patent Classifications (CPCs):
B - PERFORMING OPERATIONS B22 - CASTING B22F - WORKING METALLIC POWDER
C - CHEMISTRY C23 - COATING METALLIC MATERIAL C23C - COATING METALLIC MATERIAL
DOE Contract Number:  
W-7405-ENG-48
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
apparatus; coating; powders; process; particles; fibers; involves; agitation; vibrating; tumbling; promote; uniformly; removing; adsorbed; gases; static; charges; initial; plasma; cleaning; coatings; adhesion; subsequent; deposited; in-situ; prevent; contamination; layer; interfaces; forming; element; zr; 100-10; 000; ang; thickness; final; multiple; 1-10; microns; cu; example; brazing; processes; desired; materials; defines; surface; related; properties; essential; feature; capability; deposit; interruption; formation; contaminated; interface; adversely; affect; screening; material; coated; continuous; intermittent; vibration; agglomeration; coating adhesion; desired material; plasma clean; process involves; adversely affect; coating process; coating uniformly; forming element; essential feature; static charges; brazing process; adsorbed gas; /204/

Citation Formats

Makowiecki, Daniel M, Kerns, John A, Alford, Craig S, and McKernan, Mark A. Apparatus for coating powders. United States: N. p., 2000. Web.
Makowiecki, Daniel M, Kerns, John A, Alford, Craig S, & McKernan, Mark A. Apparatus for coating powders. United States.
Makowiecki, Daniel M, Kerns, John A, Alford, Craig S, and McKernan, Mark A. Sat . "Apparatus for coating powders". United States. https://www.osti.gov/servlets/purl/873387.
@article{osti_873387,
title = {Apparatus for coating powders},
author = {Makowiecki, Daniel M and Kerns, John A and Alford, Craig S and McKernan, Mark A},
abstractNote = {A process and apparatus for coating small particles and fibers. The process involves agitation by vibrating or tumbling the particles or fibers to promote coating uniformly, removing adsorbed gases and static charges from the particles or fibers by an initial plasma cleaning, and coating the particles or fibers with one or more coatings, a first coating being an adhesion coating, and with subsequent coatings being deposited in-situ to prevent contamination at layer interfaces. The first coating is of an adhesion forming element (i.e. W, Zr, Re, Cr, Ti) of a 100-10,000 .ANG. thickness and the second coating or final coating of a multiple (0.1-10 microns) being Cu or Ag, for example for brazing processes, or other desired materials that defines the new surface related properties of the particles. An essential feature of the coating process is the capability to deposit in-situ without interruption to prevent the formation of a contaminated interface that could adversely affect the coating adhesion. The process may include screening of the material to be coated and either continuous or intermittent vibration to prevent agglomeration of the material to be coated.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2000},
month = {1}
}