Nanometer bismuth titanate aqueous casting slurry and preparation method thereof

A technology of nano-bismuth titanate and water-based casting, which is applied in the field of water-based nano-bismuth titanate slurry, nano-bismuth titanate water-based casting slurry and its preparation, and can solve the problem of affecting the stability of slurry and the easy aggregation of aggregates. Solve problems such as sinking, achieve the effect of low cost, simple preparation process, and good dispersion

Inactive Publication Date: 2006-07-19
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, tape casting is based on a stable slurry with high solid content and moderate viscosity, and the particle size of the powder used in high-performance ceramics is mostly nanometer or submicron. Due to the high surface energy of ultrafine particles, It has a tendency to spontaneously agglomerate, and the agglomerates are easy to sink under the action of gravity, which will directly affect the stability of the slurry

Method used

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  • Nanometer bismuth titanate aqueous casting slurry and preparation method thereof
  • Nanometer bismuth titanate aqueous casting slurry and preparation method thereof
  • Nanometer bismuth titanate aqueous casting slurry and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0022] The solid phase content in the design slurry is 78wt%, the content of the dispersant acrylic acid-acrylate copolymer is 1.0wt%, the content of the binder polyvinyl alcohol is 5.0wt%, and the content of the plasticizer glycerin is 2.5 wt%, the content of antifoaming agent ether is 1.3wt% (the content of additive is the weight percentage of solid phase content), pH value is 9, according to figure 1 The technological process for preparing slurry, rheological properties such as figure 2 shown. The microscopic morphology of the upper and lower surfaces of the cast film obtained after debinding after casting is as follows: Figure 5 shown. The structure of the upper and lower surfaces of the casting film is similar, the surface is smooth, and the powder particles and pores are evenly distributed.

Embodiment 2

[0024] The solid phase content in the design slurry is 60wt%, the content of the dispersant acrylic acid-acrylate copolymer is 3wt%, the content of the binder polyvinyl alcohol is 8wt%, and the content of the plasticizer glycerol is 2.5wt% , the content of antifoaming agent ether is 1.3wt% (above-mentioned content is the weight percentage of solid phase content), pH value is 10, according to figure 1 The technological process to prepare the slurry, the rheological properties are similar figure 2 shown.

Embodiment 3

[0026] The content of acrylic acid-acrylate copolymer in the design slurry is 0.5wt%, and the relationship between the ζ-potential and the pH value of the slurry is as follows Figure 4 As shown, the rheological properties of the slurry with a solid content of 67wt% are as follows image 3 shown. Compared with the slurry without acrylic acid-acrylate copolymer, the isoelectric point of the slurry added with acrylic acid-acrylate copolymer is obviously shifted to the direction of low pH value. When the pH value is greater than 3, the ζ-potential has a large It is beneficial to improve the stability of the slurry. Since the slurry with a solid phase content of 67wt% cannot be prepared without adding acrylic acid-acrylate copolymer, for comparison, a slurry with acrylic acid-acrylate copolymer content of 0.1wt% was prepared, and it was found that adding 0.5 After adding wt% acrylic acid-acrylic acid ester copolymer, the viscosity of the slurry is reduced and the fluidity is obv...

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Abstract

The invention relates to the dispersion in water of nano bismuth titanate powder and its water-based casting slurry. Wherein, using water-soluble AA-acrylate copolymer as dispersant to disperse the nano bismuth titanate powder with size less than 180nm in water and prepare the suspension with high solid content and low viscosity and well stability; then obtaining the final slurry by adding adhensive and plasticizer from AA-acrylate copolymer, polyvinyl alcohol ,glycerin and ether. Wherein, the final content in slurry comprises: 60-80wt% solid, 0.3-4.0wt% copolymer, 4-10wt% polyvinyl alcohol, 2.5-7.0wt% glycerin and 1.25-3.5wt% ether. The final product has well property and even distribution of powder size and air pore.

Description

technical field [0001] The present invention relates to a kind of nano bismuth titanate (Bi 4 Ti 3 o 12 ) Water-based casting slurry and preparation method thereof. More precisely, it is to provide a kind of acrylic acid-acrylic ester copolymer as dispersant, polyvinyl alcohol as binder, low molecular weight alcohols as plasticizers, and low molecular weight ethers as defoamers. Extended water-based nano bismuth titanate slurry. The slurry has high solid phase content, good dispersibility and stability, and can be used to prepare casting films with a thickness of 60-300 μm. The invention belongs to the field of preparing ceramic materials by water-based casting. Background technique [0002] Bismuth titanate has low dielectric constant, high Curie point and large spontaneous polarization, and has broad application prospects in capacitors, high-temperature piezoelectric sensors and optoelectronic devices. In addition, the advantage that bismuth titanate does not contain...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/475C04B35/622
Inventor 阚艳梅王佩玲张国军
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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