Method for synthesis of binary metal composite oxide by microwave sintering
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A technology of composite oxides and binary metals, applied in the fields of rare earth metal compounds, chemical instruments and methods, preparation of alkaline earth metal aluminates/alumina/hydroxide, etc.
Inactive Publication Date: 2015-03-11
SHENYANG INSTITUTE OF CHEMICAL TECHNOLOGY
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Problems solved by technology
Therefore, many composite oxides cannot be sintered directly with a mixture of corresponding oxides in a microwave field.
Method used
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Embodiment 1
[0031] Take 5.10 g of yttrium oxide (Y 2 o 3 ), 6.00 g iron oxide (Fe 2 o 3 ), 1.20 g of activated carbon and 0.40 g of sucrose, were briefly ground into a powder mixture, and then added to a stainless steel tank of a ball mill together with 20 mL of distilled water for wet ball milling, and taken out after 3 h. After taking it out, put it in the oven at 110 o C and dried for 1 h, and pressed at 90 MPa to form a cylinder to be sintered. Put it into the MgO heat preservation tray, move it into the sintering microwave oven, at 1100 o C sintered for 50 min to obtain a sintered cylinder.
[0032] The sintered cylinder was sintered in a box-type resistance furnace at 400 o C heat treatment in air for 2 h to obtain the target product Y 3 Fe 5 o 12 .
Embodiment 2
[0034] Take 5.10 g of yttrium oxide (Y 2 o 3 ), 3.75 g alumina (Al 2 o 3 ), 1.90 g of activated carbon and 0.40 g of polyvinyl alcohol were simply ground into a powder mixture, and then added to the stainless steel tank of the ball mill together with 20 mL of alcohol for wet ball milling, and taken out after 4 h. After taking it out, put it in the oven at 90 o C and dried for 1 h, and pressed at 100 MPa to form a cylinder to be fired. Put it into the MgO heat preservation tray, move it into the sintering microwave oven, at 1200 o C sintered for 70 min to obtain a sintered cylinder.
[0035] The sintered cylinder was sintered in a box-type resistance furnace at 400 o C heat treatment in air for 2 h to obtain the target product Y 3 Al 5 o 12 .
Embodiment 3
[0037] Take 4.52 g yttrium oxide (Y 2 o 3 ), 1.20 g silicon dioxide (SiO 2 ), 1.10 g of activated carbon and 0.20 g of polyvinyl alcohol were simply ground into a powder mixture, and then added to the stainless steel tank of the ball mill together with 10 mL of alcohol for wet ball milling, and taken out after 4 h. After taking it out, put it in the oven at 90 o C and dried for 1 h, and pressed at 100 MPa to form a cylinder to be fired. Put it into the MgO heat preservation tray, move it into the sintering microwave oven, at 1100 o C sintered for 50 min to obtain a sintered cylinder.
[0038] The sintered cylinder was sintered in a box-type resistance furnace at 400 o C heat treatment in air for 2 h to obtain the target product Y 2 SiO 5 .
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Abstract
A method for synthesis of a binary metal composite oxide by microwave sintering relates to a method for synthesis of the metal oxides, the method is as follows: internal heating of the reaction system is performed by use of the properties that activated carbon mixed in a reactant can absorb microwave, and high temperature solid state reaction can be completed at relatively lower temperature and in shorter time. The method is suitable for the realization of microwave sintering reaction between a non-microwave-absorption metal oxide and a weak-microwave-absorption metal oxide. A proper amount of activated carbon is added into a mixture of the non-microwave-absorption metal oxide and the weak-microwave-absorption metal oxide which are weighed in stoichiometric ratio, the activated carbon, the non-microwave-absorption metal oxide and the weak-microwave-absorption metal oxide are fully mixed, and the mixture is pressed into a cylinder to be burned. The cylinder to be burned is put into a heat insulating support made of magnesium oxide refractory bricks, then sent into a microwave oven for sintering to obtain a sintered product. The sintered product is thermally treated in air and dipped and washed by hot water, and then is dried to obtain the target complex oxide. The method is applicable to all kinds of metal oxides with thermal stability, and is energy-saving, and relatively mild in conditions.
Description
technical field [0001] The invention relates to a method for synthesizing metal oxides, in particular to a method for synthesizing binary metal composite oxides by microwave sintering. Background technique [0002] Metal composite oxides are a class of inorganic compounds with special functions, which are widely used in organic catalysis, chemical mechanical polishing, electrode materials, air and water pollutant treatment, etc. Metal composite oxides can be used at high temperatures (1000 ~ 1500 o C) It is prepared by the solid phase reaction between the reactants, but the efficiency of the solid phase reaction is mainly restricted by three factors: (1) The specific surface area of the reactant solid and the contact area between the reactants; (2) (3) The diffusion rate of reactant ions between the solid phase interface and inside the composite oxide. Increase the specific surface area of the reactant by sufficient grinding, or prepare reactant raw materials with ...
Claims
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