Aluminium bronze refining

I. Aluminum bronze

Because aluminum alloy is easy to oxidize when smelting and pouring, so that the casting attack oxidation slag, aluminum bronze liquid and easy to absorb- hydrogen, so that the casting constitutes a porosity, volume and line shortening are very large, easy to make shrinkage cavity, and shrinkage cavity extension and fine. Aluminum bronze wire shorten greatly (2.49), and long using cold iron metal mold, shorten the resistance, poor or core concessions pouring temperature too high or alloy iron too advanced, easy to make large casting wall thickness or gate near the crack, so when aluminum bronze casting, it is necessary to surround easy oxidation and shorten the big features, adopt the use of technology and pithy agent, Keep an eye out for cracks and inspirations. Suitable for aluminum bronze, high nickel nickel aluminum bronze, chromium bronze, silicon bronze. This product is suitable for covering and refining aluminum and aluminum alloy, so that the metal liquid and furnace gas barrier, avoid oxidation, transpiration, inhalation. It can remove impurities in metal liquid and has the effect of heat preservation and desulfurization.

2, this product is suitable for aluminum and aluminum alloy cover and refining, so that the metal liquid and furnace gas barrier, avoid oxidation, transpiration, inhalation.

3, the response of the essence principle is as follows

Its essence principle is, the use of the main component NaNO3, graphite and AI attack chemical reaction, and at high temperature itself heat energy generation in aluminum alloy liquid gas N2, CO2, NO and so on to play the essence of purification. The reaction principle is as follows:

NaNO3 + C - > NaCO3 + N2 + CO2 write write

380 ℃

NaNO3 to Na2O + NO write

N2, NO, CO2 gas occurring after the reaction has NO corrosive stimulation effect on the human body and the environment, and its concentration effect is good. The concentration temperature is 690 -- 720℃, and the concentration time is 5 -- 12min and the stop time is 5 -- 8min.

4. Instructions and dosage:

The amount of application is the total weight of charge 0.2%----0.7%, divided into 2-- 3 times with bell jar pressed into the molten pool center from the crucible bottom 100 -- 150mm deep, each does not exceed 30% of the total weight, each concentration time is 3 -- 5min, the total concentration time is 8-- 15 min. The second method of concentration of 0.4%- 0.7% of the total weight of the charge, the concentration temperature of the alloy liquid is 730----750℃, concentration time is 12-15min, stop time is 10-12 min.