Preparation method of ITO (Indium Tin Oxide) powder and ITO sintering body

A powder and calcination technology, applied in chemical instruments and methods, inorganic chemistry, gallium/indium/thallium compounds, etc., can solve problems such as easy to be reduced, difficult to control the operation process, and unstable existence of divalent tin ions, etc., to achieve good The effect of sintering properties

Inactive Publication Date: 2010-09-15
西北稀有金属材料研究院宁夏有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although in this application document, the obtained ITO sintered body has a higher density, reaching or exceeding 7.08g / cm 3 However, divalent tin ions themselves cannot exist stably in the solution and are easily reduced. Therefore, this method is difficult to control in the actual operation process, and it is not easy to prepare ITO powder with good sintering properties.

Method used

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  • Preparation method of ITO (Indium Tin Oxide) powder and ITO sintering body
  • Preparation method of ITO (Indium Tin Oxide) powder and ITO sintering body
  • Preparation method of ITO (Indium Tin Oxide) powder and ITO sintering body

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] A solution containing indium ions and tin ions is prepared by dissolving metal indium and metal tin in hydrochloric acid, and the mass ratio of indium ions and tin ions in the solution is 90:10 when converted to indium oxide and tin oxide.

[0065] Above-mentioned solution is placed in airtight container, in this solution, add the ammoniacal liquor of 25% by weight, stir this precipitation solution, adjust the addition amount of ammoniacal liquor so that the pH value of precipitation is 8.8, control the temperature of initial precipitation solution to be about 30 ℃, precipitation Continue to stir for 2 hours after the reaction is complete, and let it settle for 12 hours.

[0066] The precipitate was filtered, and the precipitate was first washed with an ammonia solution with a concentration of 25% by weight, and then washed with an alcohol solution with a concentration of 22% by weight until the conductivity of the filtrate was less than 100 μs / cm. After washing, filter...

Embodiment 2

[0072] A solution containing tin ions and indium ions is prepared by dissolving metal indium and metal tin in hydrochloric acid, and the mass ratio of indium ions and tin ions in the solution is 90:10 when converted to indium oxide and tin oxide.

[0073] Put the above solution in a closed container, add 25% by weight of ammonia water to the solution, stir, adjust the pH value of the precipitation solution to 8.2, control the temperature of the initial precipitation solution to about 30°C, and continue stirring after the precipitation reaction is complete 2 hours, let it settle for 12 hours.

[0074] The precipitate was filtered, and the precipitate was first washed with an ammonia solution with a concentration of 35% by weight, and then with an alcohol solution with a concentration of 21% by weight until the conductivity of the filtrate was less than 100 μs / cm. After washing and filtering, the precipitate is dried at 105°C, and the dried precipitate is calcined at 1050°C into...

Embodiment 3

[0080] A solution containing tin ions and indium ions is prepared by dissolving metal indium and metal tin in hydrochloric acid, and the mass ratio of indium ions and tin ions in the solution is 90:10 when converted to indium oxide and tin oxide.

[0081] Above-mentioned solution is placed in airtight container, in this solution, add the ammoniacal liquor of 20% by weight, stir this precipitation solution, adjust the add-on of ammoniacal liquor so that the pH value of precipitation solution is 8.8, control the temperature of initial precipitation solution to be about 30 ℃, Continue to stir for 2 hours after the precipitation reaction is complete, and let it settle for 12 hours.

[0082] The precipitate was filtered, and the precipitate was first washed with an ammonia solution with a concentration of 36% by weight, and then with an alcohol solution with a concentration of 28% by weight until the conductivity of the filtrate was less than 100 μs / cm. . After washing and filteri...

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Abstract

The invention discloses a preparation method of ITO (Indium Tin Oxide) powder, comprising the following steps of: (a) adding an aqueous alkaline solution with the concentration of 10-30 percent by weight to an indium tin solution to obtain an indium tin hydroxide precipitation solution, and controlling the temperature of an initial precipitation solution between 18 DEG C and 30 DEG C in the process of adding the aqueous alkaline solution; (b) separating precipitations and liquid contained the indium tin hydroxide precipitation solution; (c) washing the separated precipitations; and (d) calcining the precipitations to obtain the ITO powder. The invention is beneficial to enhancing the sintering property of the ITO powder by selecting proper aqueous alkaline solution concentration and precipitation temperature according to that the aqueous alkaline solution concentration and the precipitation temperature have a great impact on the sintering property of the ITO powder when the indium tin solution is added to the aqueous alkaline solution; an ITO sintering body prepared by the ITO powder has at least 7.08 g/cm<3> of density, bulk resistivity lower than 1.90*10<-4> ohm.cm and maximum crystallite dimension of the sintering body, which is smaller than 10 micrometers.

Description

technical field [0001] The invention relates to metal oxides, in particular to a preparation method of ITO powder and ITO sintered body. Background technique [0002] The main component of ITO (tin indium oxide) is a composite oxide in which tin oxide is dissolved in indium oxide. ITO has good photoelectric performance, and the film containing ITO has high conductivity and visible light transmittance, and is widely used in various fields such as solar cells, liquid crystal display devices, and touch panels. The methods for preparing ITO thin films include sputtering method, vacuum evaporation method, sol-gel method, cluster deposition method, PLD method and so on. [0003] When vacuum evaporation or magnetron sputtering is used to prepare ITO film, ITO powder must be prepared first, and then the powder should be pressed and sintered into ITO target. The density of ITO sintered body is an important parameter to determine the photoelectric performance of ITO target. The high...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G19/02C01G15/00C04B35/01C04B35/457C04B35/622
Inventor 张红梅扈百直孙本双刘孝宁征卫星
Owner 西北稀有金属材料研究院宁夏有限公司
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