Industrial vacuum furnaces for heat treatment
HOME COMPANY NEWS EXHIBITIONS PRODUCTS SERVICE SPARE PARTS SPECIAL OFFERS COMPANY-GROUP/MTH CONTACT DOWNLOAD IMPRINT	before | content | next 2007.06.01 ALLNIT®, low-pressure nitriding par excellence The ALLNIT® process, patented by BMI, is a specific form of gas nitriding conducted at low pressure. The atmosphere used consists of the following gases: - Ammonia (NH3): this nitriding gas breaks down to produce nitrogen, atomic number N*, needed for the nitriding process. - Nitrogen (N2): this neutral gas reduces the nitriding power of the treatment atmosphere. - Nitrous oxide (N2O): this powerful oxidising gas acts as an accelerator for the dissociation and absorption of the ammonia. - Where applicable, a fuel gas such as a hydrocarbon or carbon dioxide, which can be added for nitrocarburizing processes. The treatment is conducted at low pressure. The vacuum pumps keep the pressure low while the injection of the nitriding mixture is controlled by mass flow meters. The working temperatures, which are between 400°C and 600°C, are standard for the nitriding process. The ALLNIT® low-pressure nitriding process is offered as an option on all tempering and annealing furnaces in the BMI range, both horizontal and vertical (B5_R and V5_R furnace groups). These vacuum furnaces are thus known as B5_RN and V5_RN. The ALLNIT® low-pressure nitriding process covers all standard gas nitriding applications. It is therefore particularly suitable for the treatment of general mechanical pieces, including transmission and friction parts, cutting tools, press or extrusion tools, plastic injection equipments, etc. The deep penetration of the cavities by the nitriding process, combined with the excellent chemical homogeneity of the installation, makes it possible to produce loads that are particularly dense and/or consist of semi-bulk. Examples of application of the ALLNIT® process:	©B.M.I. 2009