Cost effective y2o3 synthesis and related functional nanocomposites
AssigneeCorning Incorporated
InventorsJohnny Glen Arroyo, LinLin Chen, Weiguo Miao
Life of this patent
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Abstract
In one aspect the disclosure is directed to a method for inexpensively producing a Y2O3 nano-powder material, thereby facilitating the increased utilization of the material in different commercial application. In another aspect the disclosure is directed to Y2O3 nano-powder composite materials consisting of Y2O3 and at least one oxide selected from the group consisting of MgO, CaO, BeO2, Al2O3, TiO2, ZrO2, SiO2, HfO2, YbO2, GdO2, Lu2O3 and additional rare earth oxides.
Claims11
A method of making yttrium oxide contain nano-particles, the method comprising:
- preparing a solution Y(NO3)3.6H2O placing the solution in a vessel rotatable table;
- preparing a solution of ammonia carbonate solution containing ammonia sulfate and 0.2-1.0 wt. % of a water soluble polyethylene glycol as a dispersant;
- placing the vessel containing the Y(NO3)3 solution in a 60-80° C. water bath and titrating the Y(NO3)3 solution with the ammonium carbonate solution at the rate of 1-4 ml/min while the vessel containing the Y(NO3)3 solution was rotated at a speed in the range of 100-200 rpm to form a uniform precipitation of the yttrium nano-particles;
- spinning the precipitated yttrium nano-particles with sonication for a time in the range of 2-60 minutes after completion of the titration followed by decantation of the liquid and washing the nano-particles with an alcohol/water solution;
- collecting and drying the nano-particles in vacuum at a temperature in the range of 15-30° C. to provide dried yttrium oxide nano-particles;
- and
- calcining dried yttrium oxide nano-particles at a temperature in the range of 1050° C. to 1150° C. for a time of at least 2 hours.
A method for forming a yttrium oxide article from yttrium oxide nano-particles, the method comprising:
- preparing a solution Y(NO3)3.6H2O placing the solution in a vessel rotatable table;
- preparing a solution of ammonia carbonate solution containing ammonia sulfate and 0.2-1.0 wt. % of a water soluble polyethylene glycol as a dispersant;
- placing the vessel containing the Y(NO3)3 solution in a 60-80° C. water bath and titrating the Y(NO3)3 solution with the ammonium carbonate solution at the rate of 1-4 ml/min while the vessel containing the Y(NO3)3 solution was rotated at a speed in the range of 100-200 rpm to form a uniform precipitation of the yttrium nano-particles;
- spinning the precipitated yttrium nano-particles with sonication for a time in the range of 2-60 minutes after completion of the titration followed by decantation of the liquid and washing the nano-particles with an alcohol/water solution;
- collecting and drying the in vacuum at a temperature in the range of 15-30° C. to provide dried yttrium oxide nano-particles;
- calcining dried yttrium oxide nano-particles at a temperature in the range of 1050° C. to 1150° C. for a time of at least 2 hours;
- placing the calcined nano-particles in a hot isostatic pressing apparatus;
- sintering the calcined yttrium oxide nano-particle at a temperature in the range of 1200-1500° C. for a time in the range of 4-10 hours in a 15-20% V/V O2/Ar and a pressure of 1 atmosphere;
- and hot isostatic pressing by increasing the pressure to 200 MPa and holding the pressure for an additional time in the range 1 hour to 5 hours;
- and
- cooling to obtain yttrium oxide article.
Dependencies are inferred from the claim text.