The hardest tool material available next to diamond is
| The hardest tool material available next to diamond is
A. Stellite
B. Ceramics
C. Cemented Carbide
D. Cubic Boron Nitride
Please scroll down to see the correct answer and solution guide.
Right Answer is: D
SOLUTION
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 Diamond is Cubic Boron Nitride (CBN).