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Porous fiber ceramic forming method and apparatus

A technology of porous ceramics and a molding method, which is applied to ceramic products, other household appliances, household appliances, etc., can solve the problems of clogging the fiber frame, difficult control of the shape, size and distribution of holes, and difficulty in demolding, and achieves easy operation and molding. The method is simple and practical, and the effect is easy to control

Inactive Publication Date: 2005-05-11
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in this method, there are still more liquid binders outside the non-fiber contact points due to the capillary force, and these binders will block the pores formed between the fiber structures after sintering at high temperature.
In order to discharge the excess binder, it is necessary to apply a certain mechanical pressure, so that when the liquid binder is pressed out, the holes formed by the fiber structure will also be squeezed. This extrusion effect leads to the shape, size, The distribution is not easy to control, and the extrusion effect also makes the formed body and the mold close together, which has the disadvantage of difficult demoulding

Method used

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  • Porous fiber ceramic forming method and apparatus
  • Porous fiber ceramic forming method and apparatus

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Experimental program
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Effect test

Embodiment 1

[0019] The specific structure of the fiber porous ceramic molding device of the present invention is as follows: figure 1 As shown, it includes an air compressor 1 and a mold. The air compressor 1 is connected to the mold through a compressed air conduit 5. A pressure regulating valve 2, a pressure gauge 3, and a valve 4 are installed on the compressed air conduit 5. The mold includes an upper Cover 6, sample forming chamber 8, filter screen 10, sealing ring 9, base 11, the upper cover 6 and the base 11 are connected by a screw 7, the sample forming chamber 8 is a cylindrical barrel, located between the upper cover 6 and the base Between 11, the filter screen 10 is installed at its lower end, and the sealing ring 9 is arranged between the sample forming chamber 8 and the base 11, and between the sample forming chamber 8 and the upper cover 6 to seal the mould. The type of air compressor 1 used in this embodiment is: XR225 type produced in Italy, the mixer adopts JB90-D type po...

Embodiment 2

[0022] In the present embodiment, fiber adopts common aluminum silicate fiber; Binding agent is the solution that phosphoric acid and aluminum hydroxide make, and wherein the molar ratio of P / Al is 23, and by binding agent: the ratio of water=1:15 Dilution; Stir and mix the fiber and the prepared binder solution to make a slurry, pour it into the mold, add air at a pressure of 8kg, dry at 200°C for 20 hours, heat treatment at 900°C for 1.5 hours. The porosity of the prepared fiber porous ceramics is 88.91%, and the bulk density is 0.2162kg / cm 3 .

Embodiment 3

[0024] In this embodiment, mullite fiber is used as the fiber; the slurry preparation method is the same as in Embodiment 1. The slurry is poured into the mould, the pressure of the added air is 8kg, the drying temperature is 200°C for 20 hours, and the heat treatment temperature is 900°C for 1.5 hours. The porosity of the prepared fiber porous ceramics is 88.91%, and the bulk density is 0.2162kg / cm 3 .

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Abstract

The invention provides a method for forming fiber porous ceramics, which comprises the following process steps: (1) fully stirring and mixing the fiber and the binder solution to form a fiber slurry; (2) pouring the slurry into a mold; 3) Exhaust excess liquid with compressed air; (4) Demoulding, drying, and firing into desired products. A fiber porous ceramic forming device includes an air compressor and a mould, and the air compressor is connected with the mold through a compressed air conduit. The invention has the advantages of being simple and practical, easy to form porous materials of various shapes, and easy to demould. The shape, size and distribution of the pores of the fiber porous ceramics can be controlled by the size of the pores of the filter screen in the mold and the pressure of compressed air. The prepared porous ceramics have the advantages of high temperature resistance, high porosity, light weight, good air permeability, and good noise reduction performance.

Description

technical field [0001] The invention relates to a forming method of porous ceramics, in particular to a forming method and a device for making fibers into porous ceramics. Background technique [0002] In the hot gas generated by coal-fired power generation systems such as IGCC (Integrated Gasification with Circulation) or systems based on PFBC (Pressed Fluidized Bed Combustion), because it contains impurities such as coal ash, it is necessary to rely on hot gas filtration equipment To meet the requirements of the turbine inlet airflow. In order to maintain the efficiency of the system, the filtration system must operate at or near the firing temperature. In a candle filter system, hot gas flows from the outside of the filter to the inside, so that dust is deposited on the outside surface of the filter. When the dust deposits too much, it will affect the filtration efficiency. At this time, high-pressure airflow is required to purge the filter from the o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B38/00
Inventor 曾令可罗民华程小苏王慧张明陈森风刘卫东史琳琳
Owner SOUTH CHINA UNIV OF TECH