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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, reducing production costs, and prolonging equipment life

Active Publication Date: 2018-12-18
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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  • Sintering method of dense oxide ceramic body
  • Sintering method of dense oxide ceramic body
  • Sintering method of dense oxide ceramic body

Examples

Experimental program
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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 sintering method of a dense oxide ceramic body. According to the sintering method, a billet prepared by using the oxide powder is progressively sintered, the heating rate is controlled when the temperature of the billet rises to 50 DEG C lower than the heat treatment temperature of the oxide powder, and heating is performed to achieve a sintering temperature at a low rateof 0.1-1.5 DEG C / min. According to the present invention, the low-rate heating is used at the early stage of the sintering of the ceramic materials to inhibit the abnormal growth of the gas pores andthe powder particles in the billet, such that the sintering of the ceramic is uniformly performed at a low speed so as to control the grain and the gas pore morphology of the ceramic sintered body andobtain the highly-dense submicron / nanometer 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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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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