High-dielectric-strength potassium sodium niobate based lead-free piezoelectric ceramic as well as preparation method and application thereof
A potassium sodium niobate-based, lead-free piezoelectric technology, applied in the direction of fixed capacitor dielectrics, fixed capacitor components, etc., can solve the problem of lack of pressure resistance characteristics, and achieve high pressure resistance strength, good temperature stability, and extremely high temperature stability. The effect of easy chemical process
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Embodiment 1
[0043] The high withstand voltage potassium sodium niobate-based lead-free piezoelectric ceramic material provided in this example is prepared according to the following method:
[0044] (1), purchase chemically pure Na from the market 2 CO 3 、K 2 CO 3 , Li 2 CO 3 , Nb 2 o 5 , Sb 2 o 3 、 Ta 2 o 5 , MnO 2 As raw material, according to the chemical formula [(Na 0.5+x K 0.5-x ) 0.94 Li 0.06 ][(Nb 0.94 Sb 0.06 ) 0.95 Ta 0.05 ]O 3 +ymol%MnO 2 , where x=0, y=0.12 Weigh the raw materials; put the weighed raw materials into the ball mill jar, add the dehydrated alcohol accounting for 80% of the total weight of the above raw materials, and mix them at a speed of 140r / min on the planetary ball mill And grind for 2h;
[0045] (2), put the mixed material after ball milling in the crucible after drying at 60°C, pre-burn at 890°C, and keep it for 3.5h; After water ethanol, grind at a speed of 140r / min for 4h;
[0046] (3), dry the finely ground pre-fired synthetic po...
Embodiment 2
[0051] The high withstand voltage potassium sodium niobate-based lead-free piezoelectric ceramic material provided in this example is prepared according to the following method:
[0052] (1), purchase chemically pure Na from the market 2 CO 3 、K 2 CO 3 , Li 2 CO 3 , Nb 2 o 5 , Sb 2 o 3 、 Ta 2 o 5 , MnO 2 As raw material, according to the chemical formula [(Na 0.5+x K 0.5-x ) 0.94 Li 0.06 ][(Nb 0.94 Sb 0.06 ) 0.95 Ta 0.05 ]O 3 +ymol%MnO 2 , wherein x=0.01, y=0.08 take the raw material; put the weighed raw material in the ball mill jar, add the dehydrated alcohol accounting for 90% of the total weight of the above raw material, and mix it on the planetary ball mill at a speed of 120r / min And grind for 3h;
[0053] (2), put the ball-milled mixture in a crucible after drying at 90°C, pre-fire at 920°C, and hold for 4 hours; the pre-fired synthetic powder is added with anhydrous powder accounting for 85% of the total weight of the powder After ethanol, grind ...
Embodiment 3
[0059] The high withstand voltage potassium sodium niobate-based lead-free piezoelectric ceramic material provided in this example is prepared according to the following method:
[0060] (1), purchase chemically pure Na from the market 2 CO 3 、K 2 CO 3 , Li 2 CO 3 , Nb 2 o 5 , Sb 2 o 3 、 Ta 2 o 5 , MnO 2 As raw material, according to the chemical formula [(Na 0.5+x K 0.5-x ) 0.94 Li 0.06 ][(Nb 0.94 Sb 0.06 ) 0.95 Ta 0.05 ]O 3 +ymol%MnO 2, wherein x=0.03, y=0.02 take the raw material; put the weighed raw material in the ball mill jar, add the dehydrated alcohol accounting for 100% of the total weight of the above raw material, and mix it on the planetary ball mill at a speed of 160r / min And grind for 1.5h;
[0061] (2), put the mixed material after ball milling in the crucible after drying at 65°C, pre-fire at 905°C, and keep it for 2.5h; After water ethanol, grind at a speed of 200r / min for 3h;
[0062] (3) Dry the finely ground pre-fired synthetic powd...
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