Preparation method of yttrium oxide sol binder for titanium alloy shell
A technology of binder preparation and yttrium sol, which is applied in casting molding equipment, metal processing equipment, cores, etc., can solve the problems of high chemical activity, the strength of the shell needs to be improved, and poor high temperature resistance, so as to improve air permeability Performance, improvement of pH and charge, effect of improvement of surface properties
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Embodiment 1
[0012](1) Add 18 parts by weight of zirconium diboride to absolute ethanol, then add 5 parts of ricinoleic acid and 3 parts of sodium chloride to it, stir at 73°C and 350rpm for 40min, and then add the system Transfer to a sealed device, pressurize to 0.41MPa, keep the temperature at 64℃ for 1.5h, release the pressure, cool and filter, wash with absolute ethanol, and dry at 42℃;
[0013](2) Add 18 parts of zirconium diboride obtained in step (1) to 40 parts of yttrium nitrate solution with a concentration of 1.5mol / L, and then use 55KHz ultrasonic dispersion for 13min at 1℃, stop the ultrasonic, and switch to 120rpm Stir at a rotating speed, add 8 parts of saturated ammonia water to it, and continue to stir for 25 min, let stand for 4 h, then centrifuge for 9 min, filter, wash the resultant with deionized water 4 times, dry at 55 ℃, and at 930 ℃ Calcined for 3 hours, ball milled through a 300-mesh sieve to obtain yttrium oxide coated zirconium diboride particles;
[0014](3) Put 8 parts o...
Embodiment 2
[0018](1) Put 8 parts of coal gangue into a freeze-drying box, freeze at -43℃ for 3h, then ball mill to a particle size of 100μm, add it to 40 parts of deionized water, stir at 32℃, 250rpm for 15min, Add 35 parts of phosphoric acid solution with a mass fraction of 8% and 11 parts of aluminum hydroxide, then heat to 86°C and continue to stir for 3 hours to obtain.
[0019](2) Mix yttrium oxide sol with 32% yttrium oxide content with 15 parts of coal gangue-aluminum hydroxide composite system, and ultrasonically treat at 55°C for 25 minutes.
[0020]After performance test, the flexural strength of the shell at room temperature is 3.5MPa, the flexural strength at 900℃ is 4.8 MPa, and the air permeability is 0.75cm.2 / Pa·min.
Embodiment 3
[0022](1) Add 18 parts by weight of zirconium diboride to absolute ethanol, then add 5 parts of ricinoleic acid and 3 parts of sodium chloride to it, stir at 73°C and 350rpm for 40min, and then add the system Transfer to a sealed device, pressurize to 0.41MPa, keep the temperature at 64℃ for 1.5h, release the pressure, cool and filter, wash with absolute ethanol, and dry at 42℃;
[0023](2) Add 18 parts of zirconium diboride obtained in step (1) to 40 parts of yttrium nitrate solution with a concentration of 1.5mol / L, and then use 55KHz ultrasonic dispersion for 13min at 1℃, stop the ultrasonic, and switch to 120rpm Stir at a rotating speed, add 8 parts of saturated ammonia water to it, and continue to stir for 25 min, let stand for 4 h, then centrifuge for 9 min, filter, wash the resultant with deionized water 4 times, dry at 55 ℃, and at 930 ℃ Calcined for 3 hours, ball milled through a 300-mesh sieve to obtain yttrium oxide coated zirconium diboride particles;
[0024](4) Add 18 parts ...
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