Lead free piezoelectric ceramics of potassium sodium niobate and preparation thereof

A potassium sodium niobate, lead-free piezoelectric technology, applied in piezoelectric/electrostrictive/magnetostrictive devices, circuits, electrical components, etc., to achieve the effects of improving plastic deformation, low sintering temperature, and short sintering time

Active Publication Date: 2005-07-27
TSINGHUA UNIV +2
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

At present, the use of spark plasma sintering (SPS) to prepare potassium sodium niobate

Method used

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  • Lead free piezoelectric ceramics of potassium sodium niobate and preparation thereof
  • Lead free piezoelectric ceramics of potassium sodium niobate and preparation thereof
  • Lead free piezoelectric ceramics of potassium sodium niobate and preparation thereof

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[0020] The invention provides a potassium sodium niobate series lead-free piezoelectric ceramic and a preparation method thereof. The prescription of described sodium potassium niobate series lead-free piezoelectric ceramics is: with formula (1-n) K x Na 1-x NbO 3 nMH (where MH is a metal oxide or carbonate, M is a metal element of different valence, H is o or co 3 root, 0.21≤x≤0.95, 0≤n≤0.30), NaNbO 3 with KNbO 3The sum of the two accounts for 70-100 wt% of the total material. Composite 0~30wt% MH, MH is calcium, copper, manganese, barium, lithium, yttrium, strontium, titanium, zirconium, lanthanum, magnesium, aluminum, silicon, iron, cobalt, nickel, silver, tin, antimony, tantalum and tungsten At least one of oxides or carbonates.

[0021] Its preparation method is to use the spark plasma sintering method, the potassium sodium niobate (KNbO 3 -NaNbO 3 ) series piezoelectric ceramic material preparation process is: the process includes grinding and mixing, roasting to...

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Abstract

A niobic acid potassium sodium system lead-free piezoelectric ceramic and its production are disclosed. The components of the niobic acid potassium sodium system lead-free piezoelectric ceramic are (1-n)KxNa1-xNbO3.nMH, it is prepared by SPS process. The production is carried out by grinding mixing raw materials, calcining synthesizing niobate, using SPS process for the obtained powdery material, annealing treating under oxygen atmosphere, and obtaining piezoelectric/ferroelectric ceramic materials. Its advantages include lead-free composition, good piezoelectric performance, low calcining temperature, short calcining time and fine tissue.

Description

technical field [0001] The invention belongs to the field of functional ceramic materials, and in particular relates to a potassium-sodium niobate-based lead-free piezoelectric ceramic and a preparation method thereof by using a discharge plasma sintering method. Background technique [0002] Piezoelectric ceramics are important functional ceramic materials. Most of the piezoelectric ceramics currently used are lead-based piezoelectric ceramics, which will pollute the environment during preparation, use and disposal. It is inevitable to use lead-free piezoelectric ceramics instead of lead-based piezoelectric ceramics. Potassium Sodium Niobate (KNbO 3 -NaNbO 3 ) are lead-free piezoelectric ceramics and do not contain other toxic and harmful elements. NaNbO 3 , KNbO 3 and other perovskite-type compound crystals, the general formula of this type of compound is ANbO 3 (A is Na, K, etc.). Antiferroelectric NaNbO 3 and ferroelectric KNbO 3 It can form a complete solid sol...

Claims

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Application Information

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IPC IPC(8): C04B35/495C04B35/622H01L41/187
Inventor 李敬锋张波萍张利民张海龙
Owner TSINGHUA UNIV
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