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W-Ni compact is prepared by liquid phase sintering is 1500°C. If the size of the tungsten grains is 40µm and the interfacial tungsten- tungsten and tungsten-nickel energies are 0.52 and 0.30 Jm-2 respectively, the  predicted average neck size (in µm) ...Read more

W-Ni compact is prepared by liquid phase sintering is 1500°C. If the size of the tungsten grains is 40µm and the interfacial tungsten- tungsten and tungsten-nickel energies are 0.52 and 0.30 Jm-2 respectively, the  predicted average neck size (in µm) of sintered tungsten grain is:

(Melting points of tungsten and nickel are 3410°C and 1453°C, respectively)

(A)   10   (B)  15   (C) 20   (D) 25

 

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Tungsten powder is pressed at 15MPa to a green density of 55%. After sintering the compact attains 86.5% of its theoretical density. Assuming uniform shrinkage, the linear shrinkage (in % ) is ________ (answer up to   two decimal places)

Tungsten powder is pressed at 15MPa to a green density of 55%. After sintering the compact attains 86.5% of its theoretical density. Assuming uniform shrinkage, the linear shrinkage (in % ) is ________ (answer up to   two decimal places)

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4.65%(A) P & Q ( 2 voters )
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GATE MT 2013 Q38. Match the powder production technique given in Group I with the corresponding shape listed in Group II