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
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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