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Asked: 2020-07-06T13:37:11+05:30 In:

GATE MT 2017 Q47.

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

 

GATE MT 2017 Question Paper with SolutionGATE MT Powder metallurgyGATE MT Previous Year Questions With Solutionliquid phase sinteringpowder metallurgy
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      Correct answer is option C. Given that γs-s = 0.52 J/m2 and γs-l= 0.30 J/m2  2γs-l cos(Θ/2)=γs-s On simplification, (Θ/2)= 29.92 sin(Θ/2)=( x/2)/(D/2) x=20 μm  

      Correct answer is option C.

      Given that γs-s = 0.52 J/m2 and γs-l= 0.30 J/m2 

      2γs-l cos(Θ/2)=γs-s

      On simplification, (Θ/2)= 29.92 sin(Θ/2)=( x/2)/(D/2)

      x=20 μm

       

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