MCG5138k Lecture 01

18/01/2015

MCG5138 - ADVANCED TOPICS IN MECH. ENG.

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Course Plan
Surface Engineering
Introduction
Surface Preparation
Changing the
Surface Metallurgy

Changing the
Surface Chemistry

Localized Surface Hardening

Thermochemical Diffusion
Chemical Conversion
Anodizing Process
Ion Implantation

Mechanical Treatments

Methods of Characterization
18/01/2015

MCG 5138K- Surface Engineering

Adding a Surface Layer
Galvanizing Process
Thermal Spray Process
Physical Vapor Deposition
Chemical Vapor Deposition

Diff. Applications
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Outline
What is Surface Engineering?
Objective of Surface Engineering
Classification & Selection of Surface Engineering Processes
(1) Overlay vs. Surface Modification processes
(2) Changing Surface Metallurgy, Chemistry & Adding Layer Classification

Processes Selection Methodology
The Benefits of Surface Engineering
Surface Engineering to Combat Corrosion & Wear
18/01/2015

MCG 5138K- Surface Engineering

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What is Surface Engineering?
SURFACE ENGINEERING is a multidisciplinary activity intended to tailor the properties of the surfaces of engineering components so that their function and serviceability can be improved

SURFACE ENGINEERING DEFINITION: “Treatment of the surface & near-surface regions of a material to allow the surface to perform functions that are distinct from those functions demanded from the bulk of the material“ The ASM Handbook

18/01/2015

MCG 5138K- Surface Engineering

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What is Surface Engineering?
SURFACE ENGINEERING can involve an overlay process or a surface modification process
In overlay process (Coating/Thin Films) a material is added to the surface and the underlying material (substrate) is covered and not detectable on the surface.
(ii) A surface modification process changes the properties of the surface but the substrate material is still present on the surface.
(i)

18/01/2015

MCG 5138K- Surface Engineering

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What is Surface Engineering?
Surface