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THE EFFECT OF ARC PLASMA DEPOSITION ON THE STABILITY OF NON-METALLIC MATERIALS
GENERAL ELECTRIC CO CINCINNATI OHIO
All of the materials under study may now be readily deposited as thin coatings onto graphite substrates. Some of the materials, particularly ZrO2 are stressed in the as-sprayed condition, both on a micro scale lattice strains and a macro scale because of shrinkage of the individual particles. The carbides and nitrides revealed sharp, intense diffraction lines indicating an absence of lattice strains this absence does not exclude the possibility of stresses in the coating due to shrinkage of the individual particles. The materials which can be readily built up into thick coatings and which may be used as regularly shaped samples are Al2O3, Cr2O3, and ZrB2 and the carbides. When these materials are sprayed under controlled conditions and the proper gases are used, they are deposited in substantially the same form as the raw material. Minor variations in lattice parameters and stoichiometry should not preclude the use of the materials as sprayed coatings. Author