Laser Processing of Ceramics
Results of experiments exploring the feasibility of using a laser heat source for sealing plasma sprayed coatings, toughening ceramic bars, and making ceramic alloy powders are reported. Chemical modification of the coated surfaces in conjunction with surface melting showed some promise of controlling craze type cracking. Precipitates which should be beneficial to the toughness of zirconia coatings were developed as a result of laser treatment. Fine, complex microstructures were developed in the surface of ceramic alloy bars and in spherical particles. Strengthening of some bars was indicated, but it was limited by the shape and character of the underlying material. Molten droplets of selected ceramic compositions typically solidified into spheres of the order of 40–200 μm for the range of rotational speeds used in the study. Spheres typically contained porosity which enhances their crushability to give powders for possible future body fabrications.
KeywordsLaser Treatment Ceramic Coating Laser Processing None None Melted Layer
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