Test ProcedureThe test can be run in any style of furnace. Here we illustrate the procedure for a continuous mesh-belt furnace running a dissociated ammonia (75% hydrogen, 25% nitrogen) atmosphere. The test involves gathering clean, relatively thin cross-section samples made of steel, copper and (if available) stainless steel. Many people simply use steel shim stock and cut a small length of copper tubing and, if necessary, sand the surface so that it is bright and shiny for this test.
The furnace temperature is lowered to 1800-1850ºF (980-1010ºC) and the belt speed reduced so as to assure a dwell time in the high heat and cooling chamber of at least 20 minutes. CAUTION: Pure copper has a melting point of around 1981ºF (1083ºC), so care must be taken not to approach this temperature.