Question:
The Titanium Nitride or Titanium Carbonitride coated cutting tools are majorly used to
The Titanium Nitride or Titanium Carbonitride coated cutting tools are majorly used to
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Thin ceramic surface coatings (like TiN, TiC, TiCN) are applied to cutting tools to improve surface-specific properties, such as increasing hardness and reducing friction, rather than modifying bulk properties like toughness or ductility.
Updated On: Jul 9, 2026
- Make the tool ductile
- Reduce friction and wear resistance
- Increase tool toughness
- Increase thermal conductivity
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The Correct Option is B
Solution and Explanation
Concept:
Cutting tool inserts are often coated with thin ceramic layers (e.g., TiN, TiCN, $Al_2O_3$) via Chemical Vapor Deposition (CVD) or Physical Vapor Deposition (PVD) to improve their surface properties without changing the bulk toughness of the substrate core.
• Titanium Nitride (TiN): Known for its distinctive golden color. It provides a low coefficient of friction and high micro-hardness at elevated temperatures.
• Titanium Carbonitride (TiCN): Offers high abrasive wear resistance and hardness compared to TiN, making it suitable for demanding cutting conditions.
Step 1: Analyze the physical changes at the tool-chip interface. During high-speed machining, high friction at the tool-chip interface generates significant heat and accelerates crater and flank wear.
Step 2: Evaluate the function of the coatings. Applying a TiN or TiCN coating provides two primary benefits: 1. It creates a low-friction chemical barrier that reduces shearing forces and prevents material adhesion (built-up edge formation). 2. It increases the tool's wear resistance due to the high hardness of the ceramic layer. *(Note: The wording "Reduce friction and wear resistance" in the option translates technically to "Reduce friction and improve wear resistance" or "Reduce friction and reduce wear," which aligns with the intended choice).*
• Titanium Nitride (TiN): Known for its distinctive golden color. It provides a low coefficient of friction and high micro-hardness at elevated temperatures.
• Titanium Carbonitride (TiCN): Offers high abrasive wear resistance and hardness compared to TiN, making it suitable for demanding cutting conditions.
Step 1: Analyze the physical changes at the tool-chip interface. During high-speed machining, high friction at the tool-chip interface generates significant heat and accelerates crater and flank wear.
Step 2: Evaluate the function of the coatings. Applying a TiN or TiCN coating provides two primary benefits: 1. It creates a low-friction chemical barrier that reduces shearing forces and prevents material adhesion (built-up edge formation). 2. It increases the tool's wear resistance due to the high hardness of the ceramic layer. *(Note: The wording "Reduce friction and wear resistance" in the option translates technically to "Reduce friction and improve wear resistance" or "Reduce friction and reduce wear," which aligns with the intended choice).*
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