Mechanical Engineering Exam  >  Mechanical Engineering Questions  >  Which one of the following is the hardest cut... Start Learning for Free
Which one of the following is the hardest cutting tool material next only to diamond? 
  • a)
    Cemented carbides
  • b)
    Ceramics
  • c)
    Silicon
  • d)
    Cubic boron nitride
Correct answer is option 'D'. Can you explain this answer?
Verified Answer
Which one of the following is the hardest cutting tool material next o...
Ans. (d)
View all questions of this test
Most Upvoted Answer
Which one of the following is the hardest cutting tool material next o...
Hardest Cutting Tool Material after Diamond: Cubic Boron Nitride (CBN)

Cubic Boron Nitride (CBN) is considered the hardest cutting tool material after diamond. It possesses exceptional hardness and thermal stability, making it suitable for various cutting applications. Below are the reasons why CBN is the hardest cutting tool material next only to diamond:

1. Structure and Composition:
- CBN is composed of boron and nitrogen atoms arranged in a crystal lattice structure similar to diamond.
- This crystal structure gives CBN its exceptional hardness and wear resistance.

2. Hardness:
- CBN has a hardness value of approximately 4500 kg/mm², which is just slightly lower than the hardness of diamond (approximately 5000 kg/mm²).
- This high hardness allows CBN to withstand high cutting forces and resist wear even when machining hard materials.

3. Thermal Stability:
- CBN exhibits excellent thermal stability, meaning it can withstand high temperatures during machining without significant loss in hardness or wear resistance.
- This thermal stability allows CBN tools to be used at high cutting speeds and feeds, improving machining efficiency and productivity.

4. Chemical Inertness:
- CBN is chemically inert, meaning it does not readily react with other materials, including metals.
- This inertness prevents the tool material from bonding with the workpiece material during cutting, reducing tool wear and enhancing tool life.

5. Machining Applications:
- CBN is commonly used in machining applications where high hardness and wear resistance are required, especially when cutting hardened steels and superalloys.
- It is often used in the manufacturing of metalworking tools like inserts, grinding wheels, and honing stones.

In conclusion, Cubic Boron Nitride (CBN) is the hardest cutting tool material after diamond due to its exceptional hardness, thermal stability, chemical inertness, and suitability for various machining applications. Its properties make it an ideal choice for cutting hard materials and improving machining efficiency.
Attention Mechanical Engineering Students!
To make sure you are not studying endlessly, EduRev has designed Mechanical Engineering study material, with Structured Courses, Videos, & Test Series. Plus get personalized analysis, doubt solving and improvement plans to achieve a great score in Mechanical Engineering.
Explore Courses for Mechanical Engineering exam

Top Courses for Mechanical Engineering

Which one of the following is the hardest cutting tool material next only to diamond?a)Cemented carbidesb)Ceramicsc)Silicond)Cubic boron nitrideCorrect answer is option 'D'. Can you explain this answer?
Question Description
Which one of the following is the hardest cutting tool material next only to diamond?a)Cemented carbidesb)Ceramicsc)Silicond)Cubic boron nitrideCorrect answer is option 'D'. Can you explain this answer? for Mechanical Engineering 2024 is part of Mechanical Engineering preparation. The Question and answers have been prepared according to the Mechanical Engineering exam syllabus. Information about Which one of the following is the hardest cutting tool material next only to diamond?a)Cemented carbidesb)Ceramicsc)Silicond)Cubic boron nitrideCorrect answer is option 'D'. Can you explain this answer? covers all topics & solutions for Mechanical Engineering 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Which one of the following is the hardest cutting tool material next only to diamond?a)Cemented carbidesb)Ceramicsc)Silicond)Cubic boron nitrideCorrect answer is option 'D'. Can you explain this answer?.
Solutions for Which one of the following is the hardest cutting tool material next only to diamond?a)Cemented carbidesb)Ceramicsc)Silicond)Cubic boron nitrideCorrect answer is option 'D'. Can you explain this answer? in English & in Hindi are available as part of our courses for Mechanical Engineering. Download more important topics, notes, lectures and mock test series for Mechanical Engineering Exam by signing up for free.
Here you can find the meaning of Which one of the following is the hardest cutting tool material next only to diamond?a)Cemented carbidesb)Ceramicsc)Silicond)Cubic boron nitrideCorrect answer is option 'D'. Can you explain this answer? defined & explained in the simplest way possible. Besides giving the explanation of Which one of the following is the hardest cutting tool material next only to diamond?a)Cemented carbidesb)Ceramicsc)Silicond)Cubic boron nitrideCorrect answer is option 'D'. Can you explain this answer?, a detailed solution for Which one of the following is the hardest cutting tool material next only to diamond?a)Cemented carbidesb)Ceramicsc)Silicond)Cubic boron nitrideCorrect answer is option 'D'. Can you explain this answer? has been provided alongside types of Which one of the following is the hardest cutting tool material next only to diamond?a)Cemented carbidesb)Ceramicsc)Silicond)Cubic boron nitrideCorrect answer is option 'D'. Can you explain this answer? theory, EduRev gives you an ample number of questions to practice Which one of the following is the hardest cutting tool material next only to diamond?a)Cemented carbidesb)Ceramicsc)Silicond)Cubic boron nitrideCorrect answer is option 'D'. Can you explain this answer? tests, examples and also practice Mechanical Engineering tests.
Explore Courses for Mechanical Engineering exam

Top Courses for Mechanical Engineering

Explore Courses
Signup for Free!
Signup to see your scores go up within 7 days! Learn & Practice with 1000+ FREE Notes, Videos & Tests.
10M+ students study on EduRev