My main concern is that the metal powders should not weld to the mold surface and I should easily be able to eject out the pressed samples. I am looking for alternative for graphite moulds. The pressing temperature is 750 C and pressure is 5 Tons
The task is not clear. Pressure is 5 t per cm2? Is the mold fully heated to 750°C? Is the pressing carried out in air? If so, then there is hardly any material that can withstand this at 750°C. If the pressure is lower and/or the mold is only heated from the inside, then you can work with hard metal (WC-Co) under protective gas. Such molds are used for diamond synthetics, for example.
@Vadim: Yes Pressure is 110 kg per cm2, yes mold is fully heated to 750 C and pressing is carried out in air.
For 750°C in air at 110 kg/cm2 pressure, it is best to use one of nickel-based superalloys (Nimonic 80A, Inconel 625, Inconel 718, Waspaloy, Rene 41 and the like).
If there is no other way, you can also use austenitic stainless steels (AISI 316 or AISI 304), but they will wear out much faster.
For above 600 o C, graphite mold is the right choice. For alternate, heat treated steels or Super alloys may be tried. Carbides, titanium boride or tungsten may be used but these are very difficult to machine.
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