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Method for preparing potassium-sodium niobate-sodium bismuth titanate nano ceramics

A technology of sodium bismuth titanate and nano-ceramics is applied in the field of preparation of sodium potassium niobate-sodium bismuth titanate nano-ceramics, which can solve the problems that it is difficult for the original powder to reach the nanometer level, and it is difficult to obtain dense nano-ceramics.

Inactive Publication Date: 2009-08-26
NORTHWESTERN POLYTECHNICAL UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] Literature "Ruzhong Zuo, Xusheng Fang, and Chun Ye, Phase structures and electrical properties of new lead-free Na 0.5 K 0.5 NbO 3 -Bi 0.5 Na 0.5 TiO 3 ceramics, APPLIED PHYSICS LETTERS 90, 092904 (2007)" discloses a preparation method of potassium sodium niobate-sodium bismuth titanate ceramics, which adopts traditional powder making method combined with pressureless sintering method to prepare sodium potassium niobate-titanium Bismuth sodium bismuth ceramics use ordinary light spherical alumina balls, zirconia balls and agate balls as raw materials for ball milling. In the early stage of powder preparation, it is difficult to make the original powder reach the nanometer level.
In the subsequent sintering, the grains grow further, so that the grain size of the ceramics is between 1 and 5 microns, and it is difficult to obtain dense nano-ceramics.

Method used

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Examples

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Embodiment 1

[0016] Example 1, using analytically pure niobium pentoxide, sodium carbonate, potassium carbonate, titanium dioxide, and bismuth trioxide powder as raw materials, after drying at 120°C for 24 hours, according to the chemical formula 0.94Na 0.5 K 0.5 NbO 3 -0.06Bi 0.5 Na 0.5 TiO 3 Proportioning and weighing of raw material powder. The obtained powder is directly put into a high-energy ball mill with steel balls without any special treatment. The mass of the added powder is 5% of the mass of the steel balls, and is mechanically alloyed and milled without adding any ball milling medium. The milling time is 8 hours, the rotation speed is 550 rpm; the powder after grinding is calcined at 850°C for 1 hour to make the raw material powder fully react; the calcined material is taken out and crushed, and then high-energy ball milled for 1 hour, and the niobium after ball milling The salt powder is put into a metal mold with a diameter of 10 mm and pressed into shape with a press a...

Embodiment 2

[0017] Example 2, using analytically pure niobium pentoxide, sodium carbonate, potassium carbonate, titanium dioxide, and bismuth trioxide powder as raw materials, after drying at 120°C for 24 hours, according to the chemical formula 0.80Na 0.5 K 0.5 NbO 3 -0.20Bi 0.5 Na 0.5 TiO 3 Proportioning and weighing of various raw material powders. The obtained powder is directly put into a high-energy ball mill with steel balls without any special treatment. The mass of the added powder is 25% of the mass of the steel balls. Mechanical alloying ball milling is carried out without adding any ball milling medium. The ball milling time is 4 hours, the rotation speed is 450 rpm; the powder after grinding is calcined at 800°C for 3 hours, so that the raw material powder can fully react; the calcined material is taken out and crushed, and then high-energy ball milled for 2 hours, and the niobium after ball milling The salt powder is put into a metal mold with a diameter of 5 mm and pre...

Embodiment 3

[0018] Example 3, using analytically pure niobium pentoxide, sodium carbonate, potassium carbonate, titanium dioxide, and bismuth trioxide powder as raw materials, after drying at 120°C for 24 hours, according to the chemical formula 0.90Na 0.5 K 0.5 NbO 3 -0.10Bi 0.5 Na 0.5 TiO 3 Proportioning and weighing of various raw material powders. The obtained powder is directly put into a high-energy ball mill with steel balls without any special treatment. The mass of the added powder is 35% of the mass of the steel balls. Mechanical alloying ball milling is carried out without adding any ball milling medium. The ball milling time is 12 hours, the rotation speed is 350 rpm; the powder after grinding is calcined at 900°C for 2 hours, so that the raw material powder can fully react; the calcined material is taken out and crushed, and then high-energy ball milled for 2 hours, and the niobium after ball milling The salt powder is put into a metal mold with a diameter of 15 mm and p...

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Abstract

The invention discloses a method for preparing potassium-sodium niobate-sodium bismuth titanate nano ceramics, comprising the following steps: analytically pure niobium pentaoxide, sodium carbonate, potassium carbonate, titanium dioxide and bismuth trioxide are mixed and subjected to the procedures of high-energy ball-milling mixing, presintering, cold isostatic pressing, high temperature sintering, and polishing as well as metallic electrode sputtering to finally prepare the potassium-sodium niobate-sodium bismuth titanate nano ceramics; the stoichiometric proportion of the components is (1-x)[(Na0.5Bi0.5)NbO3]-x[(Bi0.5Na0.5)TiO3], wherein x ranges from 0.005 to 0.9. As sosoloid system of the potassium-sodium niobate-sodium bismuth titanate undergoes high-energy ball milling and pressureless sintering, the nanoscale potassium-sodium niobate-sodium bismuth titanate ceramics are prepared; the grain size of the ceramic is reduced from 1-5mum in the prior art to 88-93 nanometers.

Description

technical field [0001] The invention relates to a preparation method of sodium potassium niobate-bismuth sodium titanate ceramics, in particular to a preparation method of sodium potassium niobate-bismuth sodium titanate nano ceramics. Background technique [0002] Literature "Ruzhong Zuo, Xusheng Fang, and Chun Ye, Phase structures and electrical properties of new lead-free Na 0.5 K 0.5 NbO 3 -Bi 0.5 Na 0.5 TiO 3 ceramics, APPLIED PHYSICS LETTERS 90, 092904 (2007)" discloses a preparation method of potassium sodium niobate-sodium bismuth titanate ceramics, which adopts traditional powder making method combined with pressureless sintering method to prepare sodium potassium niobate-titanium Sodium bismuth acid ceramics, the ordinary light ball alumina balls, zirconia balls and agate balls used for ball milling raw materials, in the early stage of powder preparation, it is difficult to make the original powder reach the nanometer level. In the subsequent sintering, the gr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/475C04B35/495C04B35/622
Inventor 樊慧庆刘来君陈秀丽柯善明
Owner NORTHWESTERN POLYTECHNICAL UNIV
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