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A kind of sintering method of dense oxide ceramic body

A technology of dense oxide and sintering method, applied in the field of oxide ceramics, can solve the problem of inability to prepare high-density uniform ceramic films, and achieve the effects of reducing energy consumption, prolonging equipment life, and uniform mass transfer process

Active Publication Date: 2021-04-30
浙江氢邦科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Generally, in the case that the substrate cannot shrink during sintering, conventional sintering methods cannot prepare high-density uniform ceramic films

Method used

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  • A kind of sintering method of dense oxide ceramic body
  • A kind of sintering method of dense oxide ceramic body
  • A kind of sintering method of dense oxide ceramic body

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] In this embodiment, the oxide powder is SNDC (cerium oxide co-doped with samarium and neodymium), and the preparation method of the oxide powder is as follows:

[0038] (1) According to the stoichiometric ratio of the SNDC chemical formula, add corresponding doses of cerium acetate, neodymium nitrate, and samarium oxide into the ball mill tank, then add citric acid crop phase stabilizer and powder morphology control agent, and planetary ball mill for 8 hours , get slurry;

[0039] (2) Move the slurry obtained in step (1) into an oven and dry at 120°C;

[0040] (3) Put the dried product obtained in step (2) into a muffle furnace, and perform calcination treatment at 950° C. to obtain SNDC powder;

[0041] The XRD spectrum of the SNDC powder is as follows figure 1 As shown, it can be seen that the phase of the SNDC powder prepared by the above method is single, and the doping elements are solid-dissolved into the cerium oxide lattice. The SEM photo of the SNDC powder is ...

Embodiment 2

[0056] In this example, the oxide powder is exactly the same as that in Example 1, and its preparation method is also exactly the same as that in Example 1.

[0057] Utilize this SNDC powder to prepare ceramic film, specifically as follows:

[0058] (1) Using alcohol as the dispersion medium, the SNDC nano powder is ball-milled and dispersed for 16 to 20 hours;

[0059] (2) Add 0.5 to 2 times terpineol of the mass of the powder to the dispersed powder in step (1), and mix it by ball milling for 3 to 6 hours; then add EC (ethyl cellulose) with 2% of the mass of the powder solution, continue ball milling for 4 hours to obtain slurry;

[0060] (3) Coating the slurry in step (2) by screen printing on a sintered non-shrinkable YSZ (yttria-stabilized zirconia) flat substrate at 1300° C. to form a uniform film green body;

[0061] (4) Put the film blank obtained in step (3) together with the substrate into a muffle furnace for progressive sintering, that is, heat up to 750°C at a r...

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Abstract

The invention provides a method for sintering a dense oxide ceramic body. The green body prepared by using oxide powder is gradually sintered. When the temperature of the green body rises to the heat treatment temperature of the oxide powder -50°C, the heating Speed, the green body is heated to the sintering temperature at a low rate of 0.1°C / min to 1.5°C / min. This method adopts a low rate of temperature rise in the early stage of ceramic material sintering, which suppresses the abnormal growth of pores and powder particles in the green body, and makes the sintering of ceramics proceed at a low speed and uniformly, thereby realizing the control of the grain and pore morphology of the ceramic sintered body , Obtain highly dense submicron / nano ceramic sintered body.

Description

technical field [0001] The invention relates to the technical field of oxide ceramics, in particular to a sintering method of a dense oxide ceramic body. Background technique [0002] Due to its excellent mechanical properties, strong resistance to high temperature and corrosive environments, and electrical and magnetic properties under certain conditions, oxide ceramics play an important role in the fields of petroleum, chemical industry, machinery, electronics, communications, and aerospace. playing an increasingly important role. [0003] The high density and grain size of the ceramic body are one of the important technical parameters for the good performance of oxide ceramics. [0004] For high-density ceramic blocks, the preparation of high-density (>95%) oxide ceramic blocks by conventional means (that is, industrial nano-powders are easily formed and then sintered without pressure) mainly depends on the temperature of 1500 ° C to 1700 ° C. High temperature and lo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/50C04B35/622C04B35/64
CPCC04B35/50C04B35/622C04B35/62218C04B35/64C04B2235/3224C04B2235/6562C04B2235/6567C04B2235/66C04B2235/785C04B2235/96
Inventor 常晓辉王建新官万兵刘武潘星星
Owner 浙江氢邦科技有限公司
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