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Composite nano zirconia with uniform particle size distribution, continuous preparation method and equipment thereof

A nano-zirconia, particle size distribution technology, applied in zirconia, chemical instruments and methods, nanotechnology for materials and surface science, etc., can solve the problems of long preparation process, not solid solution, etc. Good sex, less reunion effect

Inactive Publication Date: 2019-06-11
林莉 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation process is long, and the stabilizer introduced during the impregnation process is mainly loaded on the surface of zirconia, not a stable solid solution

Method used

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  • Composite nano zirconia with uniform particle size distribution, continuous preparation method and equipment thereof
  • Composite nano zirconia with uniform particle size distribution, continuous preparation method and equipment thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach

[0068] A device for continuous preparation of composite nano zirconia, which includes a feed system, a reaction system and a product collection system, wherein the feed system includes two inlets, respectively the precursor of volatile zirconia and the stable The inlet of the precursor mixture of the agent and the inlet of the water vapor; the reaction system is used for the hydrolysis reaction between the water vapor and the precursor of the volatile zirconia and the precursor of the stabilizer, including a reactor, preferably, the reactor A heating device is provided outside to control the temperature of the reactor, and the product collection system is used to complete the collection of the generated nano-zirconia product. Wherein, feed system can have two kinds of implementation schemes at least, the first kind of scheme is:

[0069] Such as figure 1 As shown: the feed system includes three gas feeds, the first gas route is connected with the first gas inlet pipe 1, the f...

Embodiment 2

[0077] A kind of equipment for the continuous preparation of composite nano zirconia, the feeding system of this embodiment is the second scheme not listed in embodiment 1, specifically: as figure 2 As shown: the feeding system is composed of two gas feeds. The first gas route is connected to the first gas inlet pipe 1, the first heater 12 and the mixer 11 in sequence. The carrier gas is fed from the first gas inlet pipe 1. The flow meter 10 is used to precisely control the flow rate. After the precursors of zirconia and stabilizer are uniformly mixed in the mixer 11, they enter the pipeline and are carried by the carrier gas heated by the first heater 12 into the reactor 5. At the top, the structure of this gas path is basically the same as that in the first scheme; the second gas path is provided with a second inlet pipe and a third inlet pipe, and the carrier gas and water pass through the second inlet pipe 2 and the third inlet pipe respectively. After the intake pipes 3 ...

Embodiment 3

[0082] use figure 1 The nano-zirconia continuous production equipment, the first gas path uses high-purity nitrogen to carry the gas of zirconium tetrachloride and yttrium isopropoxide, of which the vapor pressures of zirconium tetrachloride and yttrium isopropoxide are 30kPa and 1kPa respectively, and the flow rate 1.5m 3 / h. The air flow in the second air path is 2.5m 3 / h, gas path 3 uses n-pentane, and its flow rate is 1.0m 3 / h. The second gas path and the third gas path enter the reactor through the casing, and an igniter is installed near the outlet of the mixer. After entering the reactor, n-hexane burns. The temperature in the reactor is 720°C, and the generated mixed The heterozygous zirconium hydroxide can be rapidly decomposed at high temperature to generate stable zirconium oxide.

[0083] The reaction product is a white powder, which is analyzed by laser dynamic light scattering, and the average particle size of zirconia doped with yttrium oxide is 4nm. The...

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Abstract

The invention discloses composite nano zirconium oxide with uniform particle size distribution, and a continuous preparation method and equipment thereof. The continuous preparation method comprises following steps: a zirconium oxide precursor and a stabilizing agent precursor are uniformly mixed, are delivered into a reactor by a carrier gas, are reacted with water vapor at a high temperature, and are subjected to rapid decomposition at the high temperature so as to obtain a composite nano zirconium oxide powder. The particle size of the obtained composite nano zirconium oxide ranges from 5 to 15nm, the stacking density is 0.2g / cm<3> or lower. The equipment comprises a feed system, a reaction system, and a product collecting system. The composite nano zirconium oxide prepared via the continuous preparation method is low in particle size and density, and exists in the form of aerosol. Multistage post-processing product collection and tail gas treatment are adopted in the equipment, so that a technical problem the effective collecting of composite nano zirconium oxide particles is difficult to realize is solved, product yield is increased, and air pollution caused by effusion of solid dust is prevented.

Description

technical field [0001] The invention relates to the technical field of nanoscale metal oxide powder level preparation, more specifically, a nanoscale metal oxide powder, its continuous preparation method and its equipment. Background technique [0002] Zirconia has the advantages of heat resistance, wear resistance and good chemical stability, and has received great attention in the fields of chemical sensors, high-performance ceramics, and catalytic materials. Research work in recent years has shown that fine-grained zirconia has good fracture toughness and superplasticity, and is one of the research hotspots in the field of materials. Powder with fine and uniform particle size, high purity and weak agglomeration is the key to obtain high-performance zirconia products. [0003] Zirconia has three phase states, namely monoclinic phase, tetragonal phase and cubic phase, each of which has different crystal phase density and thermodynamic stable temperature range. Normally, z...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G25/02B82Y30/00
CPCC01G25/00C01G25/02C01P2004/64C01P2006/12C01P2006/80
Inventor 林莉蒋化
Owner 林莉
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