For ferrous or non-ferrous metals, the use of nitrogen or hydrogen-based atmospheres can help you achieve the control and purity that are difficult to obtain with generated atmospheres. Nitrogen or hydrogen-based atmospheres help minimize the variations in atmosphere composition and dew point that are common with endothermic and dissociated ammonia atmospheres. Air Products has extensive experience in helping customers optimize and remotely monitor their sintering atmospheres to improve their operations.
Air Products has developed solutions for more effective lubricant removal, copper infiltration and belt life extension
Proper selection of the gas mixture type and amount allows for specific metallurgical properties, surface quality, and dimensional control
With Air Products’ Atmosphere Solutions, variations in atmosphere composition and dew point, typical with endothermic atmospheres and dissociated ammonia, are minimized
Experienced applications engineers can identify and resolve furnace atmosphere issues that cause sooting, discolouration, decarburation, oxidation, etc.
Air Products’ Atmosphere Solutions for sintering provide an excellent means to improve the quality of sintered components
What determines the dew point reading measured in the hot zone of a sintering furnace?
The dew point in the hot zone of a sintering furnace is a result of different sources of O₂ reacting with the available hydrogen, creating moisture. Assuming there are no cracks in the muffle, water leaks in the cooling sections, or contaminated supply gases, then the following are some known sources of O₂:
Once the dew point (H₂O %) is measured, we then can control the oxidation/reduction potential by controlling the amount of H₂ in the atmosphere, thereby adjusting the H₂/H₂O ratio as per the requirements of the material that is being sintered. If you are having a process issue that you think may be related to dew point, please call Air Products at 800-654-4567.
The role of gas constituents in a sintering atmosphere is re-examined in order to optimize sintered properties of iron-carbon powder metal (PM) components.
Sintering applications: How to identify and correct oxidation problems?