Plasma spraying of Al2O3 and Al2O3Y2O3 |
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Authors: | Volker Wilms Herbert Herman |
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Affiliation: | Department of Materials Science, State University of New York, Stony Brook, N.Y. 11794 U.S.A. |
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Abstract: | A microstructural study has been carried out of plasma-sprayed Al2O3 and mixed and sintered Al2O3Y2O3. In order to ascertain the degree of metastability achieved by plasma spraying, these results are compared with a similar experiment utilizing a CO2 laser for melting and the hammer-and-anvil technique for quenching of the same materials. X-ray diffraction methods were used to determine the obtained phases and crystal structures. In addition, transmission electron microscopy was used to confirm the phases present and to study their morpology. The porosity was studied with both mercury intrusion porosimetry and small angle neutron scattering. The addition of Y2O3 is shown to decrease the porosity from 15% to 7.5%. Adhesion is likewise related to the addition of Y2O3 and it is seen that adhesion of the mixture is measurably improved over that of pure Al2O3. The implication of these results is discussed. |
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