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Barium zirconate fiber and method for preparing same

A barium zirconate and fiber technology, applied in the field of barium zirconate fiber and its preparation, can solve the problems of barium zirconate fiber technology, poor thermal shock resistance stability, low thermal conductivity of barium zirconate, etc. Stable and reliable fiber quality, resistance to mechanical vibration, uniform and stable sol

Active Publication Date: 2016-06-01
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, barium zirconate has low thermal conductivity, good mechanical and structural stability under extreme environmental conditions, thermal shock resistance, and good thermal shock resistance. It is an excellent high-temperature insulation material; currently, as a high-temperature insulation material, zirconium There are many reports on the preparation of barium zirconate ceramic materials, such as CN103864419A discloses a preparation method of high-density barium zirconate ceramics
However, compared with ceramic fibers, ceramic bulk materials have high density, high thermal conductivity, and poor thermal shock resistance.
But so far there is no report about barium zirconate fiber technology

Method used

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  • Barium zirconate fiber and method for preparing same
  • Barium zirconate fiber and method for preparing same
  • Barium zirconate fiber and method for preparing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Embodiment 1: prepare barium zirconate fiber with acetic acid as acid source

[0037] (1) Weigh 31.80g of basic zirconium carbonate and 19.74g of barium carbonate in a beaker, then add 24g of glacial acetic acid and 24g of methanol, and heat and stir at 60°C until dissolved to prepare a barium zirconate precursor solution.

[0038] (2) The obtained barium zirconate fiber solution was concentrated under reduced pressure at 40° C. to remove the solvent to obtain a barium zirconate precursor sol with a viscosity of 60 Pa·s, which was aged for 1 hour to obtain a spinning solution.

[0039] (3) At a temperature of 25°C, a humidity of 30%, a rotating speed of 18,000r / min, and a spinning hole diameter of 0.2mm, inject the obtained spinning solution into a high-speed spinning disk, and draw it into silk under the action of high-speed centrifugation , to obtain barium zirconate precursor fibers. The photo of the barium zirconate precursor fiber obtained by centrifugal spinning ...

Embodiment 2

[0044] As described in Example 1, the difference is step (4): the obtained barium zirconate precursor fiber is heated up to 600 ° C at a heating rate of 1 ° C / min, and kept at 30 min; then heated to 1500 ° C at 3 ° C / min ℃, keep it warm for 2 hours, and cool down naturally, you can get barium zirconate fiber, its SEM picture is as follows Figure 4 shown. Barium zirconate fibers can still maintain good shape and no sintering adhesion occurs between fibers.

Embodiment 3

[0045] Embodiment 3: prepare barium zirconate fiber with trifluoroacetic acid as acid source:

[0046] As described in Example 1, the difference is that the acid source was changed from glacial acetic acid to trifluoroacetic acid, and 45.6 g of trifluoroacetic acid was weighed and dissolved in a solvent, and then added to basic zirconium carbonate and barium carbonate. The spinning solution preparation, centrifugal spinning and sintering process are the same as in Example 1.

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Abstract

The invention relates to a barium zirconate fiber and a method for preparing the same. The diameter of the barium zirconate fiber is 1-20 micrometers, and crystalline phases of the barium zirconate fiber are cubic phases and can keep stable under the condition of high temperatures of 1500 DEG C. The method includes proportionally sufficiently stirring basic zirconium carbonate, barium sources, acid sources and solvents under the condition of temperatures of 10-90 DEG C until solution is clear and transparent, and concentrating the solution under vacuum conditions to obtain barium zirconate precursor spinning solution; carrying out high-speed centrifugal thread throwing on the precursor spinning solution to obtain a diameter precursor fiber and carrying out high-temperature heat treatment on the diameter precursor fiber to obtain the barium zirconate fiber. The barium zirconate fiber and the method have the advantages of simple processes, low cost, high yield, environmental friendliness and the like. Besides, the barium zirconate fiber is reliable in quality, has the uniform diameter and has a broad application prospect in the field of high-temperature heat-insulation materials, high-temperature proton conductors, fuel batteries and the like.

Description

technical field [0001] The invention relates to a barium zirconate fiber and a preparation method thereof, belonging to the field of inorganic non-metallic materials. Background technique [0002] Barium zirconate (BaZrO 3 ) belongs to the cubic perovskite structure with a theoretical density of 6.23g / cm 3 . The melting point is as high as 2690°C, and the thermal expansion coefficient is small, about 7.9×10 -6 K -1 (30-1000°C), low heat capacity, low sintering activity, no phase transition from -269°C to 1327°C, good thermal stability, and is an excellent thermal coating material; see CN101319383A for the preparation of barium zirconate powder . On the other hand, barium zirconate does not react chemically with yttrium barium copper oxide superconductor, and is an ideal crucible material for growing yttrium barium copper oxide superconductor; see CN103979979A for a preparation method of barium zirconate crucible. In addition, barium zirconate has low thermal conductivi...

Claims

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Application Information

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IPC IPC(8): D01F9/08
CPCD01F9/08
Inventor 王新强袁康康许东朱陆益张光辉刘雪松
Owner SHANDONG UNIV
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