Preparation method of preferred orientation BaTiO3/SrTiO3 nano composite ceramic

A nano-composite and oriented technology, applied in chemical instruments and methods, titanium compounds, inorganic chemistry, etc., can solve the problems of low cost, long cycle, low degree of ceramic anisotropy, etc., and achieve significant economic effects

Active Publication Date: 2017-03-08
BAOJI UNIV OF ARTS & SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the solid phase sintering method is one of the most commonly used methods, which has low cost and simple manufacturing process, but the cycle is long, and the degree of anisotropy of the prepared ceramics is low, so the piezoelectric constant (d 33 ) lower

Method used

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  • Preparation method of preferred orientation BaTiO3/SrTiO3 nano composite ceramic
  • Preparation method of preferred orientation BaTiO3/SrTiO3 nano composite ceramic
  • Preparation method of preferred orientation BaTiO3/SrTiO3 nano composite ceramic

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Example 1: Preparation of HT crystals

[0036] Use an electronic balance to accurately weigh 6.9 g of nanometer titanium dioxide, 5.1 g of potassium hydroxide, and 0.6 g of lithium hydroxide, measure 25 mL of distilled water in a 50 mL reactor, and react in a homogeneous reactor at 250° C. for 24 hours. After the hydrothermal treatment, the sample was washed with distilled water, filtered, and dried to obtain K 0.80 Ti 1.73 Li 0.27 O 4 ·XH 2 O (KTLO) crystal. This KTLO crystal uses 500mL HNO with a concentration of 0.2mol / L 3 Stir for 24h, use H + Exchange K + And Li + . Then the sample was washed with distilled water and acidified twice to obtain the layered protonated titanate H 1.07 T 1.73 □ 0.27 O 4 ·H 2 O crystals. The obtained crystals were washed with distilled water and ethanol and dried in a drying oven at 60°C for 12 hours to obtain HT crystals.

Embodiment 2

[0037] Example 2: Preparation of barium titanate powder

[0038] Accurately weigh 0.1 g of titanic acid and 0.4927 g of barium hydroxide (50% excess), measure 30 mL of distilled water and place in a 50 mL reactor, stir well, and react in a homogeneous reactor at 200° C. for 12 hours. After cooling, it is suction filtered, washed with 10 mL of a 0.1 mol / L HAc solution to remove excess barium hydroxide, washed with distilled water and absolute ethanol in turn, and dried for later use.

[0039] XRD and SEM were used to characterize the composition, particle size, and microstructure of barium titanate powder. Among them, Ultima IV model XRD was used for structure and crystal phase analysis, Cu Kα target, λ=0.15418nm, scanning tube voltage The tube current is 40kV, 40mA, the scanning range is 3°~60°, the scanning speed is 5° / min, the resolution of the SEM for measuring the sample morphology is 3.5nm, the maximum magnification is 300,000, and the maximum acceleration voltage is 30kV , T...

Embodiment 3

[0041] Example 3: Preparation of strontium titanate powder

[0042] When preparing strontium titanate, weigh out 0.1g titanic acid and 0.5534g strontium hydroxide (100% excess), measure 30mL distilled water and place in a 50mL reactor, stir well, and react in a homogeneous reactor at 200℃ 12h, after cooling, suction filtration, washing with 10mL of 0.1mol / L HAc solution to remove excess strontium hydroxide, washing with distilled water and absolute ethanol in turn, and drying for later use.

[0043] XRD and SEM were used to characterize the composition, particle size and microstructure of strontium titanate powder (the method is the same as in Example 2), and the results are as follows image 3 , Figure 4 Shown. image 3 What is shown is at 200℃, HT and Sr(OH) 2 ·8H 2 The XRD pattern of the ST sample obtained after 12 hours of O reaction, all diffraction peaks of the sample are consistent with the standard diffraction card of cubic phase ST. The samples are all composed of ST crys...

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Abstract

The invention discloses a preparation method of preferred orientation BaTiO3/SrTiO3 nano composite ceramic. The method includes that titanic acid, barium hydroxide and strontium hydroxide are taken as raw materials, a hydrothermal method is used to optimize technical parameters, and BT and ST ceramic powder is synthesized; through testing result analysis of a scanning electron microscope, all the prepared powder is nanoscale, a green structure is formed by tape-casting lamination according to a template grain growth method, and the composite ceramic is obtained by sintering according to a specific process. Calculation results show that the ceramic has a certain orientation; the piezoelectric constant (d33) of the polarized ceramic is big, and the preferred orientation BaTiO3/SrTiO3 nano composite ceramic can be used as a leadless piezoelectric ceramic material.

Description

Technical field [0001] The invention belongs to the technical field of nano-ceramic materials, and specifically relates to a preferred orientation BaTiO 3 / SrTiO 3 Preparation method of nano composite ceramics. Background technique [0002] Nanomaterials are currently a hotspot in materials research. Due to the essential changes in their material structure, scientists hope to use this change to obtain new materials with properties like high-strength metals or alloys and certain composite materials. Nano-ceramics are a kind of nano-materials, and the research on them began in the mid-1980s. The so-called nano-ceramics means that in the microstructure of ceramic materials, the size of crystal grains, grain boundaries and the combination between them is at least one dimension at the nanometer level. This not only greatly improves the strength, toughness and superplasticity of the material, but also overcomes many shortcomings of general ceramics, such as high brittleness and diffic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/468C01G23/00
CPCC01G23/006C01P2002/72C01P2004/03C04B35/468C04B2235/3236
Inventor 胡登卫张杭燎牛晓梅翟乐王艳王冬梅凡明锦杨得锁王宏社赵立芳郭进宝
Owner BAOJI UNIV OF ARTS & SCI
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