Method for preparing porzite porous honeycomb ceramic with needle-shaped crystal structure
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A technology of needle-shaped crystals and honeycomb ceramics, which is applied in the field of preparation of honeycomb ceramics, can solve the problems of long production cycle, low production efficiency, high production cost, etc., and achieve the effect of low cost
Inactive Publication Date: 2010-07-21
JINGDEZHEN CERAMIC INSTITUTE
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This results in high production costs, long pr
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Embodiment 1
[0032] According to the formula: ball soil 42.6, aluminum hydroxide 57.4, plus M 2 o 5 : 3.0, MF X : 3.0 for batching, then add 20% water and a small amount of binder, lubricant and other molding aids, fully knead evenly, and extrude on a honeycomb ceramic molding machine to form honeycomb ceramics with a diameter of 6 inches, a height of 150mm, and 200 mesh; microwave After drying, it is fired in a gas furnace using two-stage roasting synthesis technology, that is, firstly, in an open environment, the green body is heated to a temperature of 400°C, and then the green body is placed in a closed environment, and the green body is heated to The temperature is 950°C, and the heat preservation time is 60 minutes, and then the temperature is raised to the sintering temperature of 1400°C, and the heat preservation time is 60 minutes. The test results are shown in Table 1.
[0033] The test result of table 1 embodiment 1
[0034] Performance
Embodiment 2
[0036] According to the formula: Xingzi kaolin 44.4, aluminum hydroxide 55.6, plus M 2 o 5 : 3.0, MF X : 3.0 carries out batching, honeycomb ceramic molding, drying and firing process are the same as embodiment 1. The test results are shown in Table 2.
[0037] The test result of table 2 embodiment 2
[0038] Performance
Embodiment 3
[0040] According to the formula: Longyan kaolin 51.8, alumina 48.2, plus M 2 o 5 : 2.4, MF X 2.5 carry out batching, honeycomb ceramic molding, drying and firing process are the same as embodiment 1. The test results are shown in Table 3.
[0041] The test result of table 3 embodiment 3
[0042] Performance
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Abstract
The invention relates to a method for preparing a porzite porous honeycomb ceramic with a needle-shaped crystal structure. The method comprises the following steps: mixing various raw materials containing Al and Si, such as industrially pure kaoline, alumina, silicon oxide and the like according to the mol ratio of Al2O3/SiO2 within the range of 3:2 to 2:1, and then adding a proper amount of nano-scale mineralizing agent which is formed by mixing one or more in an oxide MxOy containing a first transition element, alkali metal and alkaline-earth metal compounds or a raw mineral material containing the compounds; adding a proper amount of fluoride MFx or a catalyst containing an F raw mineral material, screening and mixing the raw materials, adding a proper amount of forming agent, forming a blank body, then drying and finally roasting by adopting a two-stage roasting synthesis technology. In the method of the invention, the raw materials with low price can be adopted, and a particular nano-scale catalyst and mineralizing agent composite can be self-manufactured and synthesized; the porzite porous honeycomb ceramic with the whole needle-shaped crystal structure can be continuously prepared through once roasting by utilizing the principle of a gas-solid phase reaction and adopting the two-stage roasting synthesis technology at lower temperature, and the porzite porous honeycomb ceramic has the characteristics of low cost and high efficiency.
Description
(1) Technical field [0001] The patent of the present invention relates to a method for preparing honeycomb ceramics, in particular to a method for preparing porous honeycomb ceramics made of mullite with acicular crystal structure. (2) Background technology [0002] As a kind of energy-saving and environment-friendly ceramics, honeycomb ceramics is of great significance to develop honeycomb ceramics with higher performance under the severe situation of energy saving and emission reduction. [0003] As the world's environmental pollution problems become more and more serious, countries all over the world have stricter and stricter requirements on the pollution caused by diesel engines. The amount of particulate matter emitted by diesel engines is also required to be further reduced. In order to protect the environment and meet the requirements of emission standards, diesel engines must be equipped with particulate filters. [0004] The requirements placed on particulate fil...
Claims
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