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A kind of preparation method of low sintering temperature high strength composite ceramic body

A technology of low sintering temperature and composite ceramics is applied in the field of preparation of low sintering temperature and high strength ceramic bodies.

Active Publication Date: 2017-04-12
安徽名创新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The invention overcomes the disadvantage that the addition of oxides with low melting point will reduce the performance of ceramics, such as electrical conductivity, and reduces the sintering temperature under the condition of ensuring that various properties are not affected.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] (1) Preparation of small particles: by molar ratio Ce(NO 3 ) 3 : Y(NO 3 ) 3 =4:1 Weigh the corresponding nitrate, dissolve it in distilled water to form a solution with a total ion concentration of 0.25M, add glycine with 1.5 times the total ion molar number in the solution, heat and spontaneously ignite, and fully ball-mill the obtained soft aggregates, Particles with a particle size of about 100 nm were obtained.

[0016] (2) Preparation of large particles: Mix samarium oxide and cerium oxide powder at a molar ratio of 1:8, and after ball milling, burn at 900°C to obtain spherical particles with a diameter of about 800 nm.

[0017] (3) Fully mix the large and small particles according to the mass ratio of 4:1, press them into samples at 220Mpa, and press them into samples at 1250 o Sintering at C can achieve a relative density of 95% (the theoretical compaction density is 100%).

Embodiment 2

[0019] (1) Preparation of small particles: by molar ratio Ce(NO 3 ) 3 : Y(NO 3 ) 3 =5:1 Weigh the corresponding nitrate, dissolve it in distilled water to form a solution with a total ion concentration of 0.2M, add glycine with 1.8 times the total ion molar number in the solution, heat and spontaneously ignite, and after the obtained soft aggregates are fully ball-milled, Particles with a particle size of about 100 nm were obtained.

[0020] (2) Preparation of large particles: Mix samarium oxide and cerium oxide powder at a molar ratio of 1:6, and after full ball milling, burn at 880°C to obtain spherical particles of about 1um.

[0021] (3) Fully mix the large and small particles according to the mass ratio of 3:1, press them into samples at 220Mpa, and press them into samples at 1250 o Sintering at C can reach a relative density of 96%.

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Abstract

The invention discloses a preparation method of a high-strength composite ceramic body with low sintering temperature. The preparation method comprises the following steps: (1), preparation of small particles: the small particles whose particle sizes range from 80 nm to 120 nm are obtained; (2), preparation of large particles: large spherical particles are obtained; and (3), the large particles and the small particles are sufficiently mixed, pressed into sample sheets and sintered. The large particles form a framework, the small particles are taken as additives or an active agent, so that not only is the packing density of powder is increased, but also compact and high-performance ceramic can be obtained at the lower sintering temperature due to the fact that the small particles can be transferred to the surfaces of the large particles; the stacking density of powder is increased, the sintering activity of the powder is improved, and the sintering temperature is reduced; compared with a low-melting-point oxideadding method, influence on performance such as electric conductance, mechanical strength and the like of a prepared ceramic product is avoided, and the sintering temperature can be adjustedappropriately by controlling the proportion of the large particles and the small particles.

Description

technical field [0001] The invention relates to a preparation method of a ceramic body with low sintering temperature and high strength. Background technique [0002] Metal oxide ceramic materials, especially multi-component composite metal oxide materials, have a series of functional properties and have great potential application value in high-tech fields. For example, trivalent Y, Gd, Nd doped CeO 2 It has good oxygen ion conductivity at medium temperature, La 1-x Sr x co 1-y Fe y o 3-d Is an excellent oxygen permeable membrane material, Yba 2 Cu 3 o 7 Is an excellent high temperature superconducting material, CoFe 2 o 4 Is a high-density recording material, SrTiO 3 It is a good photoelectric material. To develop these composite metal oxide materials into application devices, the goodness of the precursor powder plays a crucial role. The current ceramic preparation method is to use the powder prepared by a certain method as the raw material, go through formin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/50C04B35/622
Inventor 郭涛黄智锋
Owner 安徽名创新材料科技有限公司
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