Method for production of an oxidation inhibiting titanium casting mould
OwnerSandor Cserinventor
Life of this patent
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Abstract
A method for producing a lost mold for titanium casting from a curable embedding compound. The embedding compound contains at least one oxidizable ingredient, such as zirconium. A model of an object to be cast is prepared from a material which can be melted out of the embedding compound. A mold is shaped by embedding the model in the embedding compound. The mold is cured and the embedding compound melted out by heating and holding the mold at a maximum temperature for a period of time. The mold is actively cooled to reduce the cooling time. Preferred embedding compound compositions and time-temperature profiles are disclosed.
Claims2
A method for producing an approximately 80-1000 gram lost mold for titanium casting from a curable embedding compound which contains at least one oxidizing ingredient, the method comprising the steps of:
- a) preparing a model of an object to be cast from a material which can be melted out of the embedding compound;
- (b) fastening said model to a casting gate shaper in a muffle ring;
- (c) mixing the embedding compound with a specified amount of a pasting liquid;
- (d) coating the embedding compound by pouring over said model in a muffle;
- (e) subjecting said muffle with said casting gate shaper to an excess pressure;
- (f) curing the embedding compound for at least 30 minutes and then removing said casting gate shaper;
- (g) placing said muffle in a cold furnace and heating said furnace to a holding temperature of 850° C. at a rate of at least 7° C./min.;
- (h) holding said furnace at said holding temperature until the mold is thoroughly heated;
- (i) turning off said furnace and cooling an interior of said furnace by opening a door of said furnace for approximately 15 minutes:
- (j) placing the mold on an edge of an opening of said furnace or on a register of said furnace and allowing the mold to cool for approximately 15 minutes;
- and
- (k) placing the mold outside said furnace and allowing it to reach a desired temperature for a casting operation.
A method for producing a lost mold for titanium casting from a curable embedding compound which contains at least one oxidizable ingredient, the method comprising the steps of:
- (a) selecting an embedding compound comprising a composition of 0 to 1 wt % SiO2, 0 to 1 wt % TiO2, 10 to 40 wt % Al2O3, 0 to 2 wt % Fe2O3, 0 to 1 wt % HnO, 40 to 80 wt % MqO, 2 to 10 wt % CaO, 0 to 2 wt % Na2O, 0 to 1 wt % K2O, 0 to 1 wt % P2O5 and 0 to 5 wt % Zr.
- (b) preparing a model of an object to be cast from a model material which can be melted out of said embedding compound;
- (c) shaping the mold by embedding said model with the embedding compound;
- (d) curing said embedding compound and melting out said model material by heating the mold to a maximum temperature and holding the mold at said maximum temperature for a period of time;
- and
- (e) actively cooling the mold in order to reduce a cooling time.
Dependencies are inferred from the claim text.