Question

21. If percentage of cobalt in Tungsten carbide
tool increases, then hardness of tool will
a) Increase
b) Decrease
c) Remains Constant
d) First increase then decrease​

Answer 1

Answer:

With an increase in the percentage of cobalt, hardness and strength decreases.

Explanation:

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Answer 2

(a) The hardness of tool increases when percentage of Co in tungsten carbide is increased.

Explanation:

• In hard metals the Tugsten carbide NPs are used in hard metals to produce hardness and wear resistance.
• When they are doped with cobalt, their strength and toughness is enhanced as the cobalt metal provides toughness in the tungsten carbide tool.
• The tungsten carbide NPs are usually hard and have red hardness.
• It helps in making hard and brittle objects.
• When the percentage of Co is increased, it also increases the hardness of the tool.
• So, option (a) increase is correct.