JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD

Course Objective

This course is mainly designed to make the students understand the

importance of surface engineering techniques, scope, limitations and areas of applications. This course also focuses on industrially significant coating techniques, selection and evaluation of coating characteristics.

Course Outcomes

at the end of the course, the student will be able to

• 1. Understand the significance of surface modification processes
• 2. Describe the principles of surface modification processes
• 3. Identify the testing approaches to evaluate a modified surface
• 4. Suggest a surface modification process for a particular wear situation

UNIT - I

Importance and necessity of surface engineering; past, present and future scenario of surface engineering; classification of surface engineering processes; substrates and their pretreatments; coating characteristics: coating thickness, continuity, hardness, adhesion, porosity, and bond strength

UNIT - II

Thermally Sprayed Coatings: Plasma spraying; flame spraying, detonation spray coating, High velocity oxy-fuel spraying; cod gas dynamic spray process; thermal barrier coatings. Factors influencing thermal spray coatings. Electrochemical coatings.

UNIT - III

Diffusion Coatings: Process fundamentals, advantages, limitations and applications of carburizing, liquid nitriding, carbonitriding, nitrocarburizing, and boronizing. Aluminized, chromized, and siliconized coatings.

UNIT - IV

Thin Film Coating Technology: Chemical Vapor deposition (CVD); Physical Vapor Deposition (PVD); Electron beam evaporation; magnetron sputtering; diamond like carbon coating technology; sol-gel coating technologies Plasma Processes: Plasma carburizing and plasma nitriding; plasma immersed ion implantation; plasma enhanced physical vapor deposition; plasma enhanced chemical vapor deposition.

R16 B.TECH METALLURGY AND MATERIALS ENGG.

UNIT - V

Thermal Modification Processes: different types of lasers and their applications. Laser assisted surface modification processes. Evaluation of Coatings: Thickness, bond strength and porosity measurement; hardness, wear resistance and corrosion resistance.

TEXT BOOKS:

• 1. K G Budinski, Surface Engineering for wear resistance, Prentice Hall, New Jersey, 1998
• 2. Surface Engineering, Process fundamentals and applications, Vol I and II, Lecture Notes of SERC school of Surface Engineering
• 3. Howard E. Boyer (Editor), Case Hardening of Steel, ASM International, metals Park, OH 44073

REFERENCES:

• 1. Materials science- Van Vlack
• 2. Electroplating: Basic Principles and Practice - Kanan. N (Elsevier) 2004 R16 B.TECH METALLURGY AND MATERIALS ENGG.