Introduction Nitriding Presentation for Under Graduate
- 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