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Asked: July 6, 2020In: Physical Metallurgy & Heat treatment

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) ...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

Askmemetallurgy Official

Asked: June 28, 2020In: Physical Metallurgy & Heat treatment

GATE MT 2017 Q7.

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)

Poll

Askmemetallurgy Official

Asked: June 18, 2020In: Physical Metallurgy & Heat treatment

GATE MT 2018 Q8. Consider the following engineering components: P.Gas turbine blades Q. Tungsten-based heavy alloy penetrators R.Self-lubricating bearings S.Engine block of an automobile . Which of the following two components are produced by powder metallurgy?

Poll Results

6.41%(A) P & Q ( 5 voters )

80.77%(B) Q & R ( 63 voters )

6.41%(C) Q & S ( 5 voters )

6.41%(D) P & S ( 5 voters )

Based On 78 Votes

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Poll

Askmemetallurgy Official

Asked: April 11, 2020In: Physical Metallurgy & Heat treatment

GATE MT 2016 Q.54 A liquid phase sintered SiC-Ni composite has a solid-solid grain boundary energy (γSiC-SiC) of 0.80 J.m-2 and a solid-liquid (γSiC-Ni) interfacial energy of 0.45 J.m-2. For a SiC grain size of 20 µm, the average interparticle (SiC-SiC) neck size (in µm) is:

Poll Results

0%(A) 3.03 ( 0 voters )

18.42%(B) 4.28 ( 7 voters )

65.79%(C) 9.16 ( 25 voters )

15.79%(D) 18.32 ( 6 voters )

Based On 38 Votes

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Askmemetallurgy Official

Asked: April 9, 2020In: Physical Metallurgy & Heat treatment

GATE MT 2016 Q.24 Aluminium powder having an apparent density of 810 kg.m^-3 is compacted in a cylindrical die at 600 MPa. The density of the as-pressed aluminium compact is 1755 kg.m^-3. If the height of the as-pressed compact is 12 mm, the fill height (in mm) required is ______.

Askmemetallurgy Official

Asked: April 4, 2020In: Physical Metallurgy & Heat treatment

GATE MT 2015 Q59. The driving force for sintering a compact consisting of spherical particles of radius R1 is ΔG1. If the particle size is reduced to R2=0.1 R1, the corresponding driving force ΔG2=αG1, where α is _____.

Askmemetallurgy Official

Asked: March 27, 2020In: Physical Metallurgy & Heat treatment

GATE MT 2014 Q.26 A metal powder with an apparent density of 2.5 g/cm3 was compacted in a cylindrical die to a green density of 5.5 g/cm3. If the height of the green sample was 12 mm, then the fill height of powder (in mm) would have been _____.

Poll

Askmemetallurgy Official

Asked: March 21, 2020In: Physical Metallurgy & Heat treatment

GATE MT 2013 Q38. Match the powder production technique given in Group I with the corresponding shape listed in Group II

Poll Results

73.68%(A) P-2, Q-4, R-1, S-3 ( 28 voters )

7.89%(B) P-1, Q-3, R-2, S-4 ( 3 voters )

10.53%(C) P-2, Q-3, R-4, S-1 ( 4 voters )

7.89%(D) P-3, Q-2, R-1, S-4 ( 3 voters )

Based On 38 Votes

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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

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