A kind of preparation method of polycrystalline translucent alumina ceramic with grain orientation arrangement
A technology of alumina ceramics and grain orientation, applied in the field of new materials, can solve problems such as increased brittleness, and achieve the effect of decreased brittleness and significantly ordered grain arrangement
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[0021] The present application provides a method for preparing a polycrystalline translucent alumina ceramic with grain orientation, comprising the following steps:
[0022] According to the composition and ingredients of the designed alumina ceramics, the composition of all pre-reduced alumina ceramics can adopt the technical solution of the present application, especially when high content of alumina is used, in the technical solution of the present application, the optimal The technology is that the content of alumina is higher than 99%, and other components such as zirconia or germania are included.
[0023] The alumina ceramic body is prepared by high-pressure die-casting. High-pressure die-casting is now a conventional technology in the technical field of alumina ceramic production. The high-pressure die-casting of the present application also adopts conventional technology. The pressure of high-pressure die-casting is 350MPa-550MPa, preferably 450MPa-500MPa .
[0024] ...
Embodiment 1
[0029] A preparation method of polycrystalline translucent alumina ceramics with grain orientation arrangement, comprising the following steps:
[0030] Select 99% alumina and 1% zirconia, and use 450MPa high-pressure die-casting to prepare an alumina ceramic body; the surface of the alumina ceramic body is vacuum-sputtered with yttrium oxide by electron rays, and the alumina ceramic is doped and sputtered. Energy 80kev.
[0031] The alumina ceramic body after surface doping is pre-sintered in a hydrogen atmosphere, the pre-sintering temperature is 1250° C., and the holding time is 2 hours.
[0032] When the pre-sintered alumina ceramic body is cooled to 60°C, it is immersed in a saturated calcium oxide aqueous solution for 3 hours of constant temperature impregnation at 60°C, and then dried at room temperature.
[0033] The dried alumina ceramic body is placed in a sintering furnace for sintering, and the sintering temperature is 1700 ° C. At the same time, a magnetic field ...
Embodiment 2
[0035] A preparation method of polycrystalline translucent alumina ceramics with grain orientation arrangement, comprising the following steps:
[0036] Select 99.9% alumina and 0.1% zirconia, and use 500MPa high pressure die-casting to prepare alumina ceramic blanks; sputter yttrium oxide onto the surface of the alumina ceramic blanks by electron beam vacuum sputtering, doping the alumina ceramics, and sputtering Energy 104kev.
[0037] The alumina ceramic body after surface doping is pre-sintered in a hydrogen atmosphere, the pre-sintering temperature is 1100° C., and the holding time is 2 hours.
[0038] When the pre-sintered alumina ceramic body is cooled to 60°C, it is immersed in a saturated calcium oxide aqueous solution for 3 hours of constant temperature impregnation at 60°C, and then dried at room temperature.
[0039] The dried alumina ceramic body is placed in a sintering furnace for sintering, and the sintering temperature is 1900 ° C. At the same time, a magneti...
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