Method for preparing rod-like boehmite powder by gradient-heating hydrothermal process
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A gradient heating and hydrothermal technology, applied in the preparation of alumina/hydroxide, etc., to achieve the effect of outstanding innovation, obvious comprehensive advantages and obvious environmental protection advantages
Inactive Publication Date: 2017-05-31
TAISHAN MEDICAL UNIV
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[0009] The purpose of the present invention is to provide a method for preparing rod-shaped boehmite powder by gradient heating hydrothermal method, aiming to solve the technical difficulties and environmental protection problems faced by the existing preparation of rod-shaped boehmite powder, and To provide a simple and effective preparation method for successfully preparing rod-shaped boehmite powder, and to solve the toughening problem of alumina ceramics to a certain extent, to provide alternative rod-shaped boehmite powder Body Toughener Supply Sources
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Embodiment 1
[0051] 1) First, weigh a certain amount of analytically pure aluminum sulfate reagent, add it to a container, add deionized water, stir it on a magnetic stirrer to dissolve it, and prepare Al 3+ A transparent solution A with a concentration of 0.5mol / L;
[0052] 2) Pour 20ml of solution A into the liner of a polytetrafluoroethylene hydrothermal reaction kettle with a volume of 50ml, add 20ml of deionized water, and control the filling degree at 80%;
[0053] 3) After adding 2.730g of urea with a purity of 99% as a precipitating agent, seal the hydrothermal reaction kettle, put it into a programmed temperature-controlled electric blast drying oven, raise the reaction temperature to 60°C, and keep it warm for 90 minutes, so that Realize the homogenization of the temperature inside and outside the reactor. The amount of urea used is 1.5 times the amount required for the precipitation of all aluminum ions.
[0054] 4) Then, with a temperature difference of 10°C as a step, the he...
Embodiment 2
[0059] 1) First, weigh a certain amount of analytically pure aluminum sulfate reagent, add it to a container, add deionized water, stir it on a magnetic stirrer to dissolve it, and prepare Al 3+ A transparent solution A with a concentration of 0.4mol / L;
[0060] 2) Pour 20ml of solution A into a 50ml Teflon-made hydrothermal reactor liner, add 15ml of deionized water, and control the filling degree to 70%;
[0061] 3) After adding 2.912g of urea as a precipitant, seal the hydrothermal reaction kettle, put it into a programmed temperature-controlled electric blast drying oven, raise the reaction temperature to 50°C, and maintain it for 120 minutes, so as to achieve the internal and external temperature of the reaction kettle. of homogenization. The amount of urea used is twice the amount required for the precipitation of all aluminum ions.
[0062] 4) Subsequently, with a temperature difference of 15°C as a step, the heating time is 20 minutes, and the holding time is 40 minu...
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Abstract
The invention discloses a method for preparing rod-like boehmite powder by a gradient-heating hydrothermal process. The method comprises the following steps: adding a required reaction material into a hydrothermal reaction kettle liner, sealing, raising the reaction temperature to the set initial temperature, and keeping the temperature for some time; gradually heating to the set maximum reaction temperature by a gradient heating process; and keeping at the maximum temperature for some time, naturally cooling to room temperature, carrying out centrifugal separation on the precipitation product at a certain rotation speed, and repeatedly carrying out the after-treatment process composed of water washing, anhydrous ethanol washing, certain-temperature/time electric heating forced air drying and the like, thereby implementing the control on the boehmite powder shape, and successfully preparing the rod-like boehmite powder. The method has the comprehensive advantages of cheap and accessible raw materials, low cost, no need of any additive, simple shape control process, obvious environment-friendly advantage and the like. The prepared rod-like boehmite product has high dispersion uniformity. Thus, the method is an obvious creative synthesis route.
Description
technical field [0001] The invention belongs to the technical field of preparing boehmite powder with special shape, and in particular relates to a method for preparing boehmite powder with rod-shaped shape by using a gradient heating hydrothermal method. Background technique [0002] Alumina ceramics have the advantages of corrosion resistance, high temperature resistance, wear resistance, light weight, and low cost. It is currently the industrial ceramic material with the largest production volume and the widest application range in the world. But its most fatal mechanical weakness is its own brittleness, which is determined by the structural characteristics of this type of material. The chemical bonds in alumina ceramic materials are mainly covalent bonds and ionic bonds. These two types of chemical bonds have strong directionality and high bonding strength, which makes it difficult for significant dislocation movement to occur in the structure, thus limiting Further pro...
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