Question
Download Solution PDFOut of the following cutting tools, the hardest one which is next to diamond is _______.
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFExplanation:
The hardness of some common materials in the Knoop scale is shown in the table.
|
Material |
Hardness (N/mm2) |
|
Hardness Steel |
7,000 – 13,000 |
|
Tungsten Carbide |
18,000 – 24,000 |
|
Aluminium Oxide |
20,000 – 30,000 |
|
Titanium Carbide |
18,000 – 32,000 |
|
Silicon Carbide |
21,000 – 30,000 |
|
Boron Carbide |
28,000 |
|
Cubic Boron Nitride (CBN) |
35,000 – 47,500 |
|
Diamond |
70,000 – 80,000 |
Thus from the table hardness of the material next to the Diamond is Cubic Boron Nitride (CBN).
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