The present article describes the evolution of potassium bubbles during sintering of tungsten ingots pressed from doped powder; in the manufacture of incandescent lamp filaments, tungsten powder is produced by reduction of blue tungstic oxide which is doped with potassium disilicate and aluminum chloride; the reduced tungsten particles contain submicron pores; analytical transmission electron microscopy (TEM) identified two types of pores in reduced tungsten powder; first, there are pores which ...
The buckling behavior of circular cylindrical composite shells under axial compression, bending, and combined compression-bending is studied. Both Donnell- and refined Love-type equations of motion are solved using Galerkin's method. Numerical results reflecting a wide range of radius-to-thickness and length-to-thickness ratios are presented and discussed. The interaction between axial compression and bending in the combined loading case show significant deviation from the linear noninteracting beam-column type solutions.(author)
Chemical and microstructural changes during sintering of tungsten ingots, produced from potassium aluminosilicate (AKS)-doped and reduced tungsten powder, have been studied. Analytical TEM, AES were used to identify the composition and morphology of AKS particles within the sintered ingots. The evolution of potassium bubbles in the ingots was correlated with sintering temperature and time.
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