Nitriding Presentaiton.ppt

1. The diffusion of nitrogen into the surface layers of
low carbon steels at elevated temperature. The
formation of nitrides in the surface layer creates
increased mechanical properties.

2. •Principal Reasons for Nitriding are:
•Obtain High Surface Hardness
•Obtain a Resistant Surface
•Increase Wear Resistance
•Increase Tensile Strength and Yield Point
•Improve Fatigue Life
•Improve Corrosion Resistance
(Except for Stainless Steels)

3. •Improves Mechanical Properties
•Surface Hardness
•Corrosion Resistance
•Chemical Reaction
•Nitrogen & Iron
•Core Properties Not Effected
•Temperature Range
•495 - 565 ºC
•Below Tempering Temperature
• White Layer By-Product
•Thin
•Hard Iron Nitride

4. •Process methods for nitriding include:
•Gas
•Liquid
•Plasma
•Bright
•Pack
***Lots of more nitriding methods for
specific applications***
http://www.nitriding.co.uk/np01.htm

5. •Gas methods:
•Case-Hardening Process
•Nitrogen Introduction
•Surface of a Solid Ferrous Alloy
•Suitable Temperature
•Between 495 and 565°C (for Steels)
•Nitrogenous Gas
•Ammonia

6. Liquid nitriding:
•Thermo-chemical Diffusion Treatment
•Hardening Components With
Repeatability.
•Salt Bath, at Less Critical Temperatures.
•Preserves Dimensional Stability
•Corrosion Protection
•Exhibit Long-Term Resistance to Wear,
Seizure, Scuffing, Adhesion and Fatigue.

7. •Vacuum Chamber
•Pressure = 0.64 Pa
•Pre-Heat Cycle
•Surface Cleaning
•Ion Bombardment
•Control Gas Flow
•N, H, CH4
•Ionization by Voltage
•Blue-Violet Glow
•Wear Resistant Layer
http://www.milwaukeegear.com/nitrid.htm