Preparation method of potassium sodium niobate based piezoelectric ceramics
A potassium-sodium niobate-based, piezoelectric ceramic technology, applied in piezoelectric/electrostrictive/magnetostrictive devices, circuits, electrical components, etc., can solve the problems of poor preparation process, easy volatilization, narrow sintering temperature, etc. To achieve the effect of improving electrical performance
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[0019] Example 1
[0020] A preparation method of potassium sodium niobate-based piezoelectric ceramics (such as figure 1 Shown), including the following steps:
[0021] (1) Weigh 0.48mol K respectively 2 CO 3 , 0.52mol Na 2 CO 3 , 0.96mol of Nb 2 O 5 , 0.04mol of Sb 2 O 3 , Put the accurately weighed raw materials in a nylon tank, add zirconia balls, and use absolute ethanol as the ball milling medium. According to the mass ratio of material: ball: ethanol=1:2:2, ball milling is 20 h.
[0022] (2) Put the ball-milled slurry into a drying box at 60°C for drying, and press it into Φ 30 mm discs, pre-fired to synthesize KNNS powder ((K 0.48 Na 0.52 )Nb 0.96 Sb 0.04 O 3 ); The pre-fired powder is subjected to secondary ball milling and dried.
[0023] (3) Weigh 7 wt% PVA aqueous solution according to the mass of KNNS powder to grind, and use a tablet press to make the granulated powder under a pressure of 150 MPa Φ 12.7 mm×1.3 mm disc.
[0024] (4) Debinding is carried out at a temperatu...
Example Embodiment
[0025] Example 2
[0026] A preparation method of potassium sodium niobate-based piezoelectric ceramics (such as figure 1 Shown), including the following steps:
[0027] (1) Weigh 0.5 mol K respectively 2 CO 3 , 0.5mol Na 2 CO 3 , 0.98mol of Nb 2 O 5 , 0.02mol of Sb 2 O 3 , Place the accurately weighed raw materials in a nylon tank, add zirconia balls, and use absolute ethanol as the ball milling medium. The mass ratio of material: ball: ethanol = 1:2:2 is 10 h.
[0028] (2) Put the ball milled slurry into a drying box at 50℃ for drying, and then press it into Φ 30 mm discs were pre-fired to synthesize KNNS powder ((K 0.5 Na 0.5 )Nb 0.98 Sb 0.02 O 3 ).
[0029] (3) The pre-fired powder is subjected to secondary ball milling, dried, and then added with a polyvinyl alcohol aqueous solution (the mass is 7wt% of the KNNS powder mass) for grinding, and the granulated powder is pressed at a pressure of 250MPa with a tablet press Made from Φ 12.7 mm×1.3 mm disc.
[0030] (4) Debinding at 1℃...
Example Embodiment
[0031] Example 3
[0032] A preparation method of potassium sodium niobate-based piezoelectric ceramics (such as figure 1 Shown), including the following steps:
[0033] (1) Weigh 0.5 mol K respectively 2 CO 3 , 0.5mol Na 2 CO 3 , 0.97mol of Nb 2 O 5 , 0.03mol of Sb 2 O 3 , Place the accurately weighed raw materials in a nylon tank, add zirconia balls, and use absolute ethanol as the ball milling medium. The mass ratio of the material: ball: ethanol = 1:2:2 is ball milled for 30 h.
[0034] (2) Put the ball-milled slurry into a drying box at 70℃ for drying, and then press it into Φ 30 mm discs were pre-fired to synthesize KNNS powder ((K 0.5 Na 0.5 )Nb 0.97 Sb 0.03 O 3 ). The pre-fired powder is subjected to secondary ball milling and dried.
[0035] (3) The pre-fired powder is subjected to secondary ball milling, drying, and then a polyvinyl alcohol aqueous solution (the mass is 7 wt% of the KNNS powder mass) is added for grinding, and the granulated powder is subjected to a tablet ...
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