Preparation method of zirconium oxide crystal

A zirconia and crystal technology, applied in the field of zirconia crystal preparation, can solve the problems of unsuitability for sunlight receivers, low absorption, etc., and achieve the effects of reducing the difficulty of growth, large size and uniform morphology

Pending Publication Date: 2021-04-23
SHANGHAI INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditional white or yellow zirconia is not suitable for use as a sun receiver due to its low absorption of solar radiation, but adding a secondary phase may change the whole picture

Method used

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  • Preparation method of zirconium oxide crystal
  • Preparation method of zirconium oxide crystal
  • Preparation method of zirconium oxide crystal

Examples

Experimental program
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Effect test

Embodiment 1

[0032] A method for preparing zirconia crystals, comprising the steps of:

[0033] (1) ZrO 2 and Y 2 o 3 The powders are mixed in a molar ratio of 9:1 to obtain a mixture;

[0034] (2) Put the mixture obtained in step (1) into a cold crucible surrounded by copper tubes, because ZrO 2 Conductivity is only available above 1200°C, therefore, use cold crucible induction heating to smelt ZrO 2 At the same time, metal zirconium is added as "melting metal", the amount of metal zirconium added is 1% of the total weight of the mixture, the cross-sectional shape of metal zirconium is circular, and the thickness is 0.5mm; 1min, the metal zirconium is melted, forming a small "melting zone", making the surrounding ZrO 2 The temperature of the powder rises above 1200°C, making it a conductor, and under the action of a high-frequency induced magnetic field, ZrO 2 The powder is heated and melted, and the melt close to the crucible wall is first solidified to form a drum-like ZrO under t...

Embodiment 2

[0040] A method for preparing zirconia crystals, comprising the steps of:

[0041] (1) ZrO 2 and Y 2 o 3 The powders are mixed at a molar ratio of 8:1 to obtain a mixture;

[0042] (2) Put the mixture obtained in step (1) into a cold crucible surrounded by copper tubes, because ZrO 2 Conductivity is only available above 1200°C, therefore, use cold crucible induction heating to smelt ZrO 2 At the same time, metal zirconium is added as "melt-inducing metal". The amount of metal zirconium added is 3% of the total weight of the mixture. The cross-sectional shape of metal zirconium is rectangular and the thickness is 0.8mm; Min, the metal zirconium is melted to form a small "melting zone", so that the temperature of the surrounding ZrO2 powder rises above 1200 ° C, making it a conductor. Under the action of the high-frequency induced magnetic field, the ZrO2 powder is heated and melted. Under the cooling effect of the water-cooled copper tube, the melt first solidifies to form...

Embodiment 3

[0048] A method for preparing zirconia crystals, comprising the steps of:

[0049] (1) ZrO 2 and Y 2 o 3 The powders are mixed in a molar ratio of 7:1 to obtain a mixture;

[0050] (2) Put the mixture obtained in step (1) into a cold crucible surrounded by copper tubes, because ZrO 2 Conductivity is only available above 1200°C, therefore, use cold crucible induction heating to smelt ZrO 2 At the same time, metal zirconium is added as "melting metal", the amount of metal zirconium added is 5% of the total weight of the mixture, the cross-section shape of metal zirconium is square, and the thickness is 1mm; min, metal zirconium is melted, forming a small "melting zone", making the surrounding ZrO 2 The temperature of the powder rises above 1200°C, making it a conductor, and under the action of a high-frequency induced magnetic field, ZrO 2 The powder is heated and melted, and the melt close to the crucible wall is first solidified to form a drum-like ZrO under the action o...

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Abstract

The invention discloses a preparation method of zirconium oxide crystal, and belongs to the field of preparation of metal oxide functional materials. Yttrium oxide and zirconium oxide are mixed in proportion and ground into uniform powder, the cubic zirconium oxide crystal is prepared through a cold crucible method, then reduction treatment is conducted, and the black cubic zirconium oxide crystal can be obtained. The material can realize large-size rapid crystallization growth and is suitable for large-scale production, the crucible material can be recycled as a raw material and the cost is saved, and the obtained crystal has a large crystal size and a high crystallinity.

Description

technical field [0001] The invention relates to the technical field of metal oxide functional materials, in particular to a preparation method of zirconia crystals. Background technique [0002] Today, the use of clean and renewable energy is one of the main factors in limiting climate change pollution, which is largely caused by power plants that burn fossil fuels. Improving energy efficiency and the amount of energy we get from renewable sources is an important step in reducing fossil fuel use. Solar power can generate electricity and / or heat and has huge potential, especially as the technology develops and prices drop dramatically. However, one of the practical obstacles to the development of concentrated solar power (CSP) devices is the increased efficiency of radiation collection and heat transfer with increasing operating temperature. Receiver stability above 650°C remains a critical issue. In solar thermal plants operating at high temperatures, the exploration of ne...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B11/00C30B28/06C30B29/16C30B33/02
Inventor 徐家跃胡家乐申慧田甜
Owner SHANGHAI INST OF TECH
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