Course 1 Surface Engineering and Thin Films 2025

Surface Engineering

  • Focused on development of thin films and their applications.

  • Rapidly growing field with significant technological advancements.

Surface Engineering Overview

  • Definition: Applied thin film science, concentrating on design, processing, and characterization of thin films.

Benefits of Thin Films

  • Enhanced Properties:

    • Hardness: Increases resistance to scratches and wear.

    • Young’s Modulus: A measure of the stiffness of a solid material.

    • Resistance to Plastic Deformation: Ability to maintain shape under stress.

    • Friction Coefficient: Reduced friction leading to improved efficiency.

    • Chemical Reactivity: Control over chemical interactions.

    • Electrical Properties: Enhanced conductivity or insulation as required.

    • Optical Properties: Improved light performance for various applications.

Applications of Thin Films

  • Utilized in diverse fields such as:

    • Cutting Tools: Improved performance and durability.

    • Punches and Dies: Enhanced operational lifespan.

    • Medical Devices & Surgical Implants: Biocompatibility and performance.

    • Aerospace Components: Critical performance under stress.

    • Plastic Molds: Overall lifecycle improvement.

    • Decorative Accessories: Enhanced aesthetic appeal.

    • Firearms Components: Performance and safety.

    • Sporting Goods: Lightweight and durable materials.

    • Computer Hardware: Enhanced performance and reliability.

    • Plumbing Fixtures: Increased durability and maintenance.

    • Blades and Knives: Edge retention properties.

    • Marine Hardware: Corrosion resistance in challenging environments.

    • Eyeglass Frames: Aesthetic and functional improvements.

Historical Context of Gilding

  • Oldest Arts: Gold beating techniques recorded over 5000 years ago.

  • Ancient techniques involved melting gold using blowpipes and beating with stones.

    • Example: Illustration from Egyptian tomb at Saqqara (2500 B.C.) depicts early gold processing.

Gold Beating and Gilding Techniques

  • Applications: Used for statuary, royal crowns, coffin cases, churches, and furniture (fine leaf samples from ~1500 BC).

    • Techniques have evolved from simple beating to complex layering systems.

    • Composite Structures: Gold sandwiched between layers of animal skins for durability.

Gilding Techniques

  • Gilding: The application of a thin layer of gold to various surfaces including metals, wood, porcelain, and stone.

Gold Leaf Production Process (Sakuda)

  • Process:

    • Melting and alloying of metals.

    • Casting into steel moulds.

    • Rolling passes to achieve desired thickness.

    • Beating and cutting into leaf formation.

  • Result: Extremely thin gold foils for decorative purposes.

Mercury and Fire Gilding

  • Used for decorating copper or bronze statues.

  • Techniques:

    • Surface smoothing/polishing is crucial.

    • Copper dissolved in mercury forms a smooth surface for gold leaf bonding.

Depletion Gilding

  • A technique derived from mechanical gilding, focusing on removing non-gold elements to leave pure gold behind.

  • Practiced by Andean metalsmiths about 2000 years ago.

Electroplating Overview

  • Definition: Process using electric current to deposit metal ions onto a substrate.

    • Key Metals: Chromium, Nickel, Copper, Zinc, Cadmium, Gold.

    • Process Examples:

      • Anode and cathode reactions driving deposition.

Surface Heat Treatments and Induction Heating

  • Utilizes induction coils to heat conductive materials quickly.

  • Applications in various processes including melting silicon and shaft hardening.

Carburizing Techniques

  • Different methods: Gas, Vacuum, Liquid, and Pack Carburizing to enhance surface properties through controlled atmospheres.

Plasma Nitriding

  • A method to enhance surface hardness via nitrogen incorporation.

  • Deposition processes and equipment outlined for efficiency and effectiveness.

Development of Thin Films for Wear Resistance

  • Three generations of thin films from basic polycrystalline monolayers to advanced nanocomposite films.

    • Key Innovatory Works: Various studies showcasing the evolution of film technology.

Structural Analysis and Atomic Force Microscopy (AFM)

  • Techniques for characterizing thin films' physical and chemical properties and their structural dimensions.

Innovative Applications in Filtration

  • Coated water filter papers show improved bactericidal effects through metal deposition combined with electrical power.

  • Antibacterial performances compared across different sample conditions.