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A novel process was developed to firmly coat an aluminium alloy, A16061, with α-A12O3 by means of laser processing. In this approach a mixture of SiO2 and Al powder was used to inject in the laser melted surface of aluminium. A reaction product α-A12O3 layer of a thickness of 100 μm was created which was well bonded to the aluminium surface.Various interfaces, A1/α-A12O3, Al/mullite and α-A12O3/;mullite, were studied by conventional transmission electron microscopy (CTEM) and high resolution electron microscope (HREM). It turns out that the presence of the A1/;muilite interface may be essential to form a well bonded oxide layer and the high Si-content α-A12O3 intermediate layer may be wetted better by liquid Al.
This paper concentrates on the microstructural features of steel containing 22 wt. % Cr, coated with Cr2O3 by laser processing. It turned out that after laser coating the Cr2O3 powder has completely transformed to Fe0.3Cr2.7O4 having the tetragonal distorted spinel structure. Dispersed in the coating are metallic particles with composition FeCr and a bcc structure. The phases in the coating can be explained from the Fe-Cr-O equilibrium phase diagram with the assumption that complete phase equilibrium is reached in the liquid state but not during solidification. The two equilibrium phases, L0 and Lm, that exist in the molten state solidify as two independent liquids. Addition of Si to the ceramic material, either from the steel matrix or from the ceramic powder, results in a dendritic solidification structure of Cr3O4 dendrites and a Si-containing glassy phase. The dendrites are oriented vertically in the coating, resembling the columnar microstructure that is also observed in ZrO2 thermal barrier coatings. This structure contains fewer microcracks parallel to the interface resulting in a mechanically more stable ceramic coating.
A slow, continuous infusion of 1000 μg TRH (thyrotropin releasing hormone) over a period of 4 h had a very faint and diffuse short-lasting beneficial effect on a group of 10 depressive patients. This was assessed in a double blind cross-over trial with placebo. The effect was of no therapeutic value. No difference was found between the depressive patients and a control group of normal subjects in TSH response, T3 resin uptake, T4 or free thyroxine index values as a consequence of the TRH infusion.
In a double reversal design the potency of thyrotropin releasing hormone (TRH) (500 μg intravenously) as a quick-acting antidepressive agent was evaluated. A first injection did seem to give rise to a very slight short-lasting effect, though this could not be ascertained clearly. There were no visible effects after a second injection. The thyroid stimulating hormone (TSH) response curve after TRH administration in the depressive patients group was blunted in comparison with that in a matched control group of normals.
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