Abstract: A controlled in situ etch-back technique is disclosed in which an etch melt 17 and a growth melt 18 are first saturated by a source-seed crystal 15 and thereafter etch-back of a substrate 14 takes place by the slightly undersaturated etch melt, followed by LPE growth of a layer by the growth melt, which is slightly supersaturated.
Type:
Grant
Filed:
November 30, 1981
Date of Patent:
February 15, 1983
Inventors:
James M. Administrator of the National Aeronautics and Space Administration, with respect to an invention of Beggs, Robert J. Mattauch, Alan C. Seabaugh
Abstract: The impact resistance of flame retardant composites, especially thermoplastic molding compounds containing over 60% hydrated mineral filler such as Al(OH).sub.3 or Mg(OH).sub.2 is improved by coating the filler with 1 to 20% of an elastomer. The composite will fail by crazing or shearing rather than by brittle fracture. A well bonded elastomeric interphase results by utilizing acidic substituted resins such as ethyl-hexyl acrylate-acrylic acid copolymers which bond to and are cross-linked by the basic filler particles. Further improvement in impact resistance is provided by incorporating 1 to 10% of a resin fiber reinforcement such as polyvinyl alcohol fibers that decompose to yield at least 30% water when heated to decomposition temperature.
Type:
Grant
Filed:
June 11, 1980
Date of Patent:
February 8, 1983
Assignee:
The United States of America as represented by the Administrator of the National Aeronautics and Space Administration
Inventors:
William A. Mueller, John D. Ingham, William W. Reilly
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