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Sodium bismuth titanate-barium titanate lead-free transparent electro-optic ceramic and preparation method thereof
The invention relates to a sodium bismuth titanate-barium titanate lead-free transparent electro-optic ceramic and a preparation method thereof; the electro-optic ceramic has the chemical composition of (1-x)(Na0.5Bi0.5)TiO3-xBaTiO3, wherein 0.05<=x<=0.08; the preparation method includes the steps: batching Na2CO3, Bi2O3, TiO2 and BaCO3 as raw materials according to the stoichiometric ratio, carrying out ball milling, and mixing evenly to obtain a powder; carrying out heat preservation on the powder for 2-4 h at the temperature of 850-950 DEG C, and thus obtaining a synthetic material; crushing the synthetic material, sieving, carrying out ball milling, adding a binder, and carrying out press molding to obtain a blank; next, placing the blank in a sintering furnace, heating up from room temperature to 800 DEG C-850 DEG C at the speed of 200 DEG C-250 DEG C/h, and carrying out heat preservation for 0.5-1.5 h; and heating up at the speed of 100 DEG C/h and gradually pressurizing to 200-250 MPa, followed by keeping the pressure unchanged, heating up to 1000 DEG C-1050 DEG C, then carrying out heat preservation for 2 h, then heating up to 1100 DEG C-1200 DEG C at the speed of 50 DEG C/h, carrying out heat and pressure preservation for 8-24 h, then releasing the pressure, cooling to 900 DEG C at the speed of 100 DEG C/h, and cooling to room temperature along with a furnace, wherein oxygen is introduced with the flow quantity of 3-5 L/minute when the heating is started and introduction of oxygen is stopped when the pressure is released.
Sodium bismuth titanate-barium titanate lead-free transparent electro-optic ceramic and preparation method thereof
The invention relates to a sodium bismuth titanate-barium titanate lead-free transparent electro-optic ceramic and a preparation method thereof; the electro-optic ceramic has the chemical composition of (1-x)(Na0.5Bi0.5)TiO3-xBaTiO3, wherein 0.05<=x<=0.08; the preparation method includes the steps: batching Na2CO3, Bi2O3, TiO2 and BaCO3 as raw materials according to the stoichiometric ratio, carrying out ball milling, and mixing evenly to obtain a powder; carrying out heat preservation on the powder for 2-4 h at the temperature of 850-950 DEG C, and thus obtaining a synthetic material; crushing the synthetic material, sieving, carrying out ball milling, adding a binder, and carrying out press molding to obtain a blank; next, placing the blank in a sintering furnace, heating up from room temperature to 800 DEG C-850 DEG C at the speed of 200 DEG C-250 DEG C/h, and carrying out heat preservation for 0.5-1.5 h; and heating up at the speed of 100 DEG C/h and gradually pressurizing to 200-250 MPa, followed by keeping the pressure unchanged, heating up to 1000 DEG C-1050 DEG C, then carrying out heat preservation for 2 h, then heating up to 1100 DEG C-1200 DEG C at the speed of 50 DEG C/h, carrying out heat and pressure preservation for 8-24 h, then releasing the pressure, cooling to 900 DEG C at the speed of 100 DEG C/h, and cooling to room temperature along with a furnace, wherein oxygen is introduced with the flow quantity of 3-5 L/minute when the heating is started and introduction of oxygen is stopped when the pressure is released.
Sodium bismuth titanate-barium titanate lead-free transparent electro-optic ceramic and preparation method thereof
CHENG WENXIU (author) / HE XIYUN (author) / QIU PINGSUN (author) / ZENG XIA (author) / XIA BIN (author)
2015-07-01
Patent
Electronic Resource
English
IPC:
C04B
Kalk
,
LIME
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