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Method for synthesizing multi-element, inorganic compound ceramic uniformed powder

A technology of inorganic composite and synthesis method, which is applied in the field of synthesizing multiple inorganic composite ceramic powders by molten salt technology, which can solve the problems of difficulty in obtaining pure-phase uniform ceramics and the deviation of composite materials from the stoichiometric ratio, so as to achieve uniform particles and lower sintering temperature points , the effect of uniform composition

Inactive Publication Date: 2006-06-21
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the coexistence of multiple components, the properties of each component such as melting point and stability are different. It is generally difficult to obtain ceramics with pure phase and uniformity by ordinary synthesis and sintering methods, especially when the mixed components contain substances with low melting points. Composite materials synthesized by solid-state reaction method seriously deviate from stoichiometric ratio

Method used

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  • Method for synthesizing multi-element, inorganic compound ceramic uniformed powder
  • Method for synthesizing multi-element, inorganic compound ceramic uniformed powder
  • Method for synthesizing multi-element, inorganic compound ceramic uniformed powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-7

[0025] (Na 0.5 K 0.5 )NbO 3 The synthesis of the system, its preparation steps are as follows:

[0026] 1. K with a purity greater than 99% 2 CO 3 、Na 2 CO 3 and Nb 2 o5 as the starting material, according to K 2 CO 3 :Na 2 CO 3 : Nb 2 o 5 = 1: 1: 2 molar stoichiometric ratio batching, the prepared material is ball milled in a ball mill for 12 hours, the grinding aid of the ball mill is dehydrated alcohol, and the volume ratio of prepared material and dehydrated alcohol is 1: 1~ 4;

[0027] 2. Add flux to the material after ball milling, the flux is NaCl, KCl, K 2 SO 4 and Na 2 SO 4 One, two or several mixtures, the ratio of the mass of the flux to the total mass of the initial reactants is 1:1, and then mixed and ball milled for 12 hours and then dried at <120°C, the grinding aid of the ball mill is Dehydrated alcohol, the volume ratio of its material and dehydrated alcohol is 1: 1~4;

[0028] 3. Press the dry powder into tablets, put it into a high-tempera...

Embodiment 1

[0032] K 2 O-Na 2 O-Nb 2 o 5 The molar ratio is 1:1:2, and the starting material is K 2 CO 3 、Na 2 CO 3 and Nb 2 o 5 , the chemical ratio of raw materials is 1:1:2, the flux is KCl+NaCl, the mass ratio of KCl and NaCl is 1:1, the ball milling time is 12 hours, the heat treatment temperature is 650°C, and the heat treatment time is 4 hours.

Embodiment 2

[0034] K 2 O-Na 2 O-Nb 2 o 5 The molar ratio is 1:1:2, and the starting material is K 2 CO 3 、Na 2 CO 3 and Nb 2 o 5 , the chemical ratio of raw materials is 1:1:2, the flux is KCl+NaCl, the mass ratio of KCl and NaCl is 1:1, the ball milling time is 12 hours, the heat treatment temperature is 750°C, and the heat treatment time is 4 hours.

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Abstract

A method for synthesizing multi inorganic composite chinaware homogeneous powder by employing molten salt growth method, comprising the following steps: firstly, preparing ingredient according to the chemical measuring ratio of the synthesizing powder, grinding; then adding one or two or several mixing fluxing agent of NaCl, KCl, Na2SO4 and K2SO4, mixing and ball grinding, and drying; pressing the dried powder material into slice, sintering briquette under temperature of 650-950 Deg C; washing the sintered briquette in the warm deionized water to remove the fluxing agent, drying, and getting the multi inorganic composite chinaware homogenous powder. The method is particularly suited for the system of multiinorganic chinaware homogenous powder containing Na, K, Li which is easy to volitilize under high temperature. The product is characterized by homogenous component, uniform granule, small granular size, lower synthesizing temperature than traditional solid phase method, shortened synthesizing time, greatly reduced calcinated temperature and denser chinaware.

Description

technical field [0001] The invention relates to a method for synthesizing multi-element inorganic composite ceramic powder by adopting molten salt technology. Background technique [0002] With the development of ceramic technology and the need to further improve a certain performance of ceramics and explore the relationship between its performance and components, the diversification and compounding of inorganic ceramics has become a trend in the development of ceramics. For example, piezoelectric ceramics are composed of the early unit system BaTiO 3 , PbTiO 3 etc. After Pb(Zr 0.5 Ti 0.5 )O 3 (PZT), Ba(Zr 0.5 Ti 0.5 )O 3 (BZT), Pb(Mg 1 / 3 Nb 2 / 3 )O 3 (PMN) and other binary systems, developed into today's more complex ternary and quaternary components Pb(Mg 1 / 3 Nb 2 / 3 )O 3 -PbTiO 3 (PMN-PT), Pb(Zn 1 / 3 Nb 2 / 3 )O 3 -PbTiO 3 (PZN-PT), Na 1 / 2 Bi 1 / 2 TiO 3 -K 1 / 2 Bi 1 / 2 TiO 3 -BaTiO 3 (NBT-NBK-BT), the performance of piezoelectric ceramics has been greatly...

Claims

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Application Information

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IPC IPC(8): C04B35/622C04B35/01
Inventor 刘韩星曹明贺程志政
Owner WUHAN UNIV OF TECH