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Cobalt-containing coated particles and preparation method thereof

A coating particle and coating technology is applied in the field of traced cobalt-containing coated particles and the preparation thereof, which can solve the problems of difficult operation of the distinguishing method, and achieve the effects of low cost, industrialized mass production, and convenient process operation.

Active Publication Date: 2017-06-16
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The interior of the reactor is a highly radioactive environment, and the general method of differentiation is difficult to operate

Method used

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  • Cobalt-containing coated particles and preparation method thereof
  • Cobalt-containing coated particles and preparation method thereof
  • Cobalt-containing coated particles and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] The fluidized bed reactor was heated to 1100 °C under an argon atmosphere; with Ar and H 2 The mixed gas is fluidizing gas, H 2 The flow rate of Ar is 6L / min, the flow rate of Ar is 1.0L / min, 40g ZrO 2 - CoO (based on the total mass of the particles, the mass fraction of CoO is 3%) particles are put into the fluidized bed for fluidization in the fluidized bed reaction zone at 1100° C., and the average diameter of the particles is 600 μm.

[0040] Methyltrichlorosilane steam, constant temperature at 35 °C, when the fluidized bed reaction zone continues to heat up to 1430 °C, methyl trichlorosilane steam is introduced, H 2 is the carrier gas, the flow rate of the carrier gas is 0.6L / min, and the reaction time is 2h to obtain a low-temperature silicon carbide layer. Lower the temperature to 1150°C, adjust the flow rate of Ar to 4.0L / min, the flow rate of acetylene to 5L / min, and the reaction time to 40s to obtain a loose pyrolytic carbon layer. The temperature of the fl...

Embodiment 2

[0045] The fluidized bed reactor was heated to 1100 °C under an argon atmosphere; with Ar and H 2 The mixed gas is fluidizing gas, H 2 The flow rate of Ar is 8L / min, the flow rate of Ar is 0.6L / min, 40g ZrO 2 -CoO (based on the total mass of the particles, the mass fraction of CoO is 6%) particles are placed in a fluidized bed at 1100° C. for fluidization, and the average diameter of the particles is 800 μm.

[0046] Methyltrichlorosilane is made into steam at 35°C with a constant temperature water bath, and the temperature of the fluidized bed is continuously raised to 1430°C to feed methyltrichlorosilane steam, H 2 is the carrier gas, the flow rate of the carrier gas is 0.6L / min, and the reaction time is 3h to obtain a low-temperature silicon carbide layer. Cool the fluidized bed to 1150°C, adjust the Ar flow rate to 4.0 L / min, the acetylene flow rate to 5 L / min, and the reaction time to 40 s to obtain a loose pyrolytic carbon layer. Adjust the gas flow into the fluidized...

Embodiment 3

[0049] The fluidized bed reactor was heated to 1100 °C under an argon atmosphere; with Ar and H 2 The mixed gas is fluidizing gas, H 2 The flow rate of Ar is 6L / min, the flow rate of Ar is 1.0L / min, 40g ZrO 2 - CoO (based on the total mass of the particles, the mass fraction of CoO is 8%) particles are placed in a fluidized bed at 1100° C. for fluidization, and the average diameter of the particles is 600 μm.

[0050] Dimethyldichlorosilane vapor is kept at 30°C with a constant temperature water bath, and the temperature is continuously raised to 1380°C to feed dimethyldichlorosilane vapor, H 2 is the carrier gas, the flow rate of the carrier gas is 0.4L / min, and the reaction time is 2h to obtain a low-temperature silicon carbide layer. The temperature of the fluidized bed reaction zone was raised to 1350°C, the flow rate of Ar was adjusted to 4.0L / min, the flow rate of propylene was 2.0L / min, and the reaction time was 160s to obtain an inner dense pyrolytic carbon layer. R...

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Abstract

The invention provides design of cobalt-containing coated particles for tracing different fuel elements in reactors. The cobalt-containing coated particles adopt a multi-layer structure, and cores of the particles are cobalt-containing ceramic particles which are formed by carbide or oxide ceramic of dispersed single cobalt or a dispersed cobalt compound; the dimensions of the cores are in a range of 200-900 mu m, and the mass fraction of cobalt contained in the cores ranges from 0.1%-35%; a low-temperature coating silicon carbide layer, an inner pyrolytic carbon layer, a high-temperature coating silicon carbide layer and an outer pyrolytic carbon layer are sequentially arranged from each core to the outside. A full-ceramic multi-layer-coating cobalt-containing coated particle form is designed, and cobalt elements are constrained in the coated particles. Particularly, the low-temperature coating silicon carbide layers are used as the innermost layers of the coating layers, cobalt precipitation during coating and follow-up treatment is prevented, and effects caused by tracing particles on internal environments of the reactors under the in-reactor running condition are avoided.

Description

technical field [0001] The invention belongs to the field of particle design and material preparation, and in particular relates to a cobalt-containing coated particle for tracing and a preparation method thereof. Background technique [0002] Energy is one of the material driving forces to promote social and economic development. The current dominant fossil energy has caused a large number of environmental problems such as large-scale and continuous smog pollution in the process of use. Therefore, it is necessary to establish a scientific and reasonable energy structure and develop new energy. The problem is becoming more and more urgent. As a clean energy nuclear energy, its research and application are also in a new stage of development. The operation of nuclear power plants is inseparable from nuclear fuel elements. At present, according to the different types of reactors, various types of fuel elements have been continuously designed. For the same stack type, the desi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G21C3/04G21C21/00
CPCG21C3/04G21C21/00Y02E30/30
Inventor 刘荣正刘马林常家兴邵友林马景陶刘兵
Owner TSINGHUA UNIV
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