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Preparation method of niobium-soluble lithium titanate solid-solution medium ceramic powder

A technology of dielectric ceramics and solid solutions, applied in chemical instruments and methods, titanium compounds, inorganic chemistry, etc., can solve the problems of low sintering activity, low powder purity, coarse particles, etc., to achieve industrial production, process stability, good reproducibility

Active Publication Date: 2014-03-19
广东奥胜新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with the chemical method, the powder prepared by the traditional solid-phase synthesis method has the disadvantages of low purity, coarse particles, low sintering activity, and easy reduction of Ti, deterioration of performance, etc.

Method used

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  • Preparation method of niobium-soluble lithium titanate solid-solution medium ceramic powder
  • Preparation method of niobium-soluble lithium titanate solid-solution medium ceramic powder
  • Preparation method of niobium-soluble lithium titanate solid-solution medium ceramic powder

Examples

Experimental program
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Effect test

Embodiment 1

[0031] The present invention uses LiNO 3 , Nb 2 o 5 and Ti(C 4 h 9 O) 4 For the raw material. Raw material LiNO 3 , Ti(C 4 h 9 O) 4 and Nb 2 o 5 By the expression Li 2.06 Nb 0.18 Ti 0.76 o 3 The stoichiometric ratio of the preparation. First, the raw material LiNO 3 , Ti(C 4 h 9 O) 4 Weigh the raw materials respectively according to the Li:Ti molar ratio of 2.06:0.76; then weigh the LiNO 3 and Ti(C 4 h 9 O) 4 Add citric acid solution (mass concentration: 50%), the molar ratio of citric acid to metal ions is 3:1, and heat to about 40°C. After stirring for 30 minutes to dissolve, add ammonia water to adjust the pH value to adjust the pH of the solution The value is 5. Then add ethylene glycol to the solution, the molar ratio of ethylene glycol to citric acid is 3:1, and add sodium polyacrylate at the same time, the molar ratio of sodium polyacrylate to ethylene glycol is 0.5:1, and heat the solution to 90°C , and kept stirring for 6h, then a black we...

Embodiment 2

[0033] In this experiment, LiNO 3 , Nb 2 o 5 and Ti(C 4 h 9 O) 4 For the raw material. Raw material LiNO 3 , Ti(C 4 h 9 O) 4 and Nb 2 o 5 By the expression Li 2.08 Nb 0.24 Ti 0.68 o 3 The stoichiometric ratio of the preparation. First, the raw material LiNO 3 , Ti(C 4 h 9 O) 4 Weigh the raw materials respectively according to the Li:Ti molar ratio of 2.08:0.68; then weigh the LiNO 3 and Ti(C 4 h 9 O) 4 Add citric acid solution (mass concentration: 50%), the molar ratio of citric acid to metal ions is 3:1, and heat to about 40°C. After stirring for 30 minutes to dissolve, add ammonia water to adjust the pH value to adjust the pH of the solution The value is 5.5. Then add ethylene glycol to the solution (the molar ratio of ethylene glycol to citric acid is 3:1), and at the same time add sodium polyacrylate (the molar ratio of sodium polyacrylate to ethylene glycol is 1:1), and heat the solution to 90℃, and keep stirring for 8h, a black wet gel can be pre...

Embodiment 3

[0035] In this experiment, LiNO 3 , Nb 2 o 5 and Ti(C 4 h 9 O) 4 For the raw material. Raw material LiNO 3 , Ti(C 4 h 9 O) 4 and Nb 2 o 5 By the expression Li 2.01 Nb 0.03 Ti 0.96 o 3 The stoichiometric ratio of the preparation. First, the raw material LiNO 3 , Ti(C 4 h 9 O) 4 Weigh the raw materials respectively according to the Li:Ti molar ratio of 2.01:0.96; then weigh the LiNO 3 and Ti(C 4 h 9 O) 4 Add citric acid solution (mass concentration: 50%), the molar ratio of citric acid to metal ions is 4:1, and heat to about 40°C. After stirring for 30 minutes to dissolve, add ammonia water to adjust the pH value to adjust the pH of the solution. The value is 4.5. Then add ethylene glycol to the solution (the molar ratio of ethylene glycol to citric acid is 2:1), and at the same time add sodium polyacrylate (the molar ratio of sodium polyacrylate to ethylene glycol is 0.5:1), and heat the solution to 90°C, and kept stirring for 8h, then a black wet gel c...

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Abstract

The invention discloses a preparation method of niobium-soluble lithium titanate solid-solution medium ceramic powder. The microwave medium ceramic powder adopts LiNO3, Ti(C4H9O)4 and Nb2O5 as raw materials. The method comprises the steps of weighing the LiNo3 and Ti(C4H9O)4 according to a molar ratio of (2+x): (1-4x) (wherein x is more than 0 and less than 0.2), adding the well-prepared citric acid solution, adding ethylene glycol, adjusting the pH value by utilizing ammonia water, uniformly stirring the obtained solution, standing the solution in a sealing manner so as to obtain gel, drying and grinding the gel, adding the Nb2O5 into the dry gel powder according to the molar ratio of Li: Nb: Ti of (2+x): 3x: (1-4x) (wherein x is more than 0 and less than 0.2), carrying out ball milling and mixing by adopting the absolute ethyl alcohol as the medium, and drying and calcining the obtained powder so as to obtain the ceramic powder. The method is simple in synthesis process, stable in process under the normal temperature and good in repeatability and has a wide application prospect.

Description

technical field [0001] The invention belongs to the field of microwave dielectric ceramic powder in the subject of materials, and in particular relates to a preparation method of a niobium solid solution lithium titanate solid solution dielectric ceramic powder. Background technique [0002] Microwave dielectric ceramics refer to ceramics that are used as dielectric materials in microwave frequency band circuits and perform one or more functions. It is a new type of functional ceramic material developed in the past 30 years and has been widely used in microwave and mobile communication fields. With the continuous development of modern mobile communication equipment in the direction of chip type, miniaturization, low cost and environmental protection, the development of low-temperature co-fired ceramics that can be co-fired with high-conductivity low-melting-point metal Ag has become the mainstream of microwave dielectric material development. . Low temperature co-fired micr...

Claims

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Application Information

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IPC IPC(8): C01G23/00C04B35/462
Inventor 曾群董小明陆文艺罗赣明刘志勇
Owner 广东奥胜新材料有限公司
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