Microstructural features induced by spray forming of a ternary Pb-Sn-Sb alloy |
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Authors: | V C Srivastava Anish Upadhyaya S N Ojha |
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Affiliation: | (1) Department of Metallurgical Engineering, Banaras Hindu University, 221 005 Varanasi, India |
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Abstract: | An alloy containing Pb-12% Sn-12% Sb with small addition of copper and arsenic was spray deposited employing two different
atomization gas pressure and nozzle to substrate distances. The temperature of the spray-deposit was measured during deposition
at a distance of 2 and 10 mm above the substrate-deposit interface. Thermal profile data indicated small variation in temperature
with time during deposition stage whereas during post deposition stage an exponential decrease in temperature was recorded.
Second phase particle size along the thickness of the deposit varied from 4 to 8 μm compared to 70 to 80 μm size of these
particles in the as cast alloy. Maximum porosity occurred in the section of the deposit near the contact surface of the substrate
and also in its peripheral regions. X-ray diffraction analysis exhibited the formation of additional Cu2Sb phase in the spray-deposit and CuSn and Cu3.3Sb phases in atomized powders compared to that of the as cast alloy. The microstructural evolution during spray deposition
of this alloy is discussed. |
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Keywords: | Spray forming thermal profile microstructure second phase porosity |
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