Even the excellent performance of high-temperature alloy castings, the foundry, they also have to pay attention to the prevention of the generation of holes, but to be simple, specific time to do what you want to pay attention to?
In order to make high-temperature alloy castings after molding has a smooth surface and high precision, the key is prevention pores, the most traditional approach is to increase the casting temperature, while reducing the casting speed, because doing so enables smooth slow liquid titanium filled with wax mold. And into the dewaxing links, be sure to clean, can not leave residue.
In addition, the shell of the firing temperature should be suitable, in general, silica and ethyl silicate shell 950 to 1100 degrees Celsius, sodium silicate shell 850 to 900 degrees Celsius; Not only that, the time should be properly controlled. For some complex special thin-walled parts, but also pay attention to air permeability, if reasonable to set up some vent, then to avoid the generation of holes of great help.