\n\tPlasma nitriding is a surface-hardening process in which glow-discharge technology introduces nascent (atomic) nitrogen into the surface of a metal part for subsequent inward diffusion. The process takes place in a vacuum chamber, with the workpiece as the cathode (negative potential) in a nitrogen\/hydrogen atmosphere at pressures between 100 and 1000 Pa (0.015 and 0.15 psi).<\/p>\n
\n\tA voltage in the range of 500 to 1000 volts is applied between the metal part and the chamber wall, resulting in the formation of a plasma through which positive nitrogen ions are accelerated against the negative-biased part to be treated. This ionic bombardment heats the piece to the treatment temperature, cleans the surface by sputtering, and provides active nitrogen species for the nitriding process.<\/p>\n
\n\tThe diagram shows the schematic of a device used for glow-discharge plasma nitriding. 1 and 2, gas introduction; 3, thermocouple; 4, cathode; 5, pressure sensor, 6 to 8, needle valve; 9, diaphragm valve; 10, solenoid; 11, vacuum pump; 12, sample holder; 13, sample; 14, anode; 15, sealing ring; 16, stainless tube; 17, window and 18, insulator.<\/p>\n
\n\tVolume 4D, Heat Treating of Irons and Steels<\/em> ? Nitriding of Stainless Steels ? Thermochemical Nitriding Treatments <\/p>\n","protected":false},"excerpt":{"rendered":" Plasma nitriding is a surface-hardening process in which glow-discharge technology introduces nascent (atomic) nitrogen into the surface of a metal part for subsequent inward diffusion<\/p>\n","protected":false},"author":63082,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[439,440,441,492,474,493,1,488],"tags":[],"class_list":["post-8663","post","type-post","status-publish","format-standard","hentry","category-general","category-news","category-news-articles","category-nitriding-and-nitrocarburizing","category-steels","category-surface-hardening","category-uncategorized","category-vacuum-heat-treating"],"yoast_head":"\n