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A kind of layered slurry preparation method of titanium carbide gradient porous ceramics

A gradient porous and titanium carbide technology, applied in the field of porous ceramics, can solve the problems of complex preparation process, difficult practical application, and difficulty in controlling the gradient change rate of the gradient ceramic structure, and achieve strong operability, simple process, and low cost. Effect

Active Publication Date: 2021-04-06
BEIJING JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This process can prepare materials with different layer spacing and top-down gradient structure ceramics, but the gradient change rate of the gradient ceramic structure prepared by this process is difficult to control, and the practical application is difficult.
Invention patent "A silver-loaded gradient porous ceramic material prepared by vacuum foaming process and its preparation method" (application number: CN201710559204.2) by crushing porcelain powder, adding binder and foaming agent, grouting and vacuuming Gradient porous ceramic materials are prepared by pressing, high temperature sintering and other processes. The pore size distribution and porosity of the gradient porous ceramic materials prepared by this method are adjustable, but the preparation process is complicated and it is difficult to prepare samples with large pores.

Method used

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  • A kind of layered slurry preparation method of titanium carbide gradient porous ceramics
  • A kind of layered slurry preparation method of titanium carbide gradient porous ceramics

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Choose 20PPI sponge template, soak it in 10% NaOH solution for 10 hours, then put it in CMC (sodium hydroxymethyl cellulose) solution for 20 hours and dry it. Divide the sponge template into 2 evenly along a certain direction. layer, and mark the interface position; weigh 2 grams of PVB powder and 98 grams of absolute ethanol to prepare a PVB ethanol solution, weigh 48 grams of titanium powder and 12 grams of carbon powder, add 60 grams of the prepared PVB ethanol solution, and roll the ball mill for 12 hours. To obtain the slurry, the layered organic sponge is layered from top to bottom. First, the entire template is immersed in the slurry for 5 times, and then the lower layer of the template is immersed in the slurry for 2 times. The template after hanging slurry is placed in an oven and dried at 60 °C to obtain a gradient porous ceramic body. Finally, the green body is placed in a high-temperature furnace, and heated to 1400 °C under argon protection for 2 hours for p...

Embodiment 2

[0023] Select 30PPI sponge template, soak it in 10% NaOH solution for 10h, then put it in CMC solution for 20h and dry, divide the sponge template into 4 layers evenly along a certain direction, and mark the position of each layer; Weigh 3 grams of PVB powder and 97 grams of anhydrous ethanol to prepare a PVB ethanol solution, weigh 48 grams of titanium powder and 10 grams of carbon powder, add 58 grams of the prepared PVB ethanol solution, and perform roller ball milling for 16 hours to obtain a slurry. The organic sponge is layered from top to bottom. First, the entire template is immersed in the slurry for 4 times, and then the remaining three layers of the template except the top layer are immersed in the slurry, and the slurry is suspended twice. Follow this method Each layer of the template is slurried in turn, so that each layer of the template is slurried for 4, 6, 8, and 10 times respectively, and then the template after sizing is put into an oven to dry at 60°C to obt...

Embodiment 3

[0026] Choose 50PPI sponge template, soak it in 10% NaOH solution for 10h, then put it in CMC solution for 20h and dry, divide the sponge template into 3 uneven layers along a certain direction, and mark each layer Position: Weigh 4 grams of PVB powder, 96 grams of absolute ethanol to prepare PVB ethanol solution, weigh 48 grams of titanium powder, 6 grams of carbon powder, add 54 grams of the prepared PVB ethanol solution, and roll ball mill for 8 hours to obtain slurry. The layered organic sponge is layered from bottom to top. First, the bottom layer of the template is immersed in the slurry for one time, then the bottom two layers of the template are coated for one time, and finally the entire template is coated for four times, so that Each layer of the template is hung with slurry for 4, 5, and 6 times respectively, and then the template after hanging is naturally dried at room temperature to obtain a gradient porous ceramic body. Pressureless sintering was performed at ℃ ...

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Abstract

The invention discloses a preparation method for layered slurrying of titanium carbide gradient porous ceramics, which is realized through the following technical scheme: titanium powder and carbon powder are used as raw materials, and the two are weighed according to the molar ratio of 1:0.5-1, Add a certain amount of PVB and absolute ethanol to make a slurry; use 20-60PPI organic sponge as a template, divide it into 2-6 layers along a certain direction, and hang slurry on each layer of the template in turn, between every two layers The times of slurrying are increased by 1 to 2 times, the template after slurrying is dried, and the titanium carbide gradient porous ceramics are obtained through pressureless sintering. The porosity of the titanium carbide porous ceramics prepared by the invention is distributed in a gradient, and the porosity and gradient change rate on both sides can be regulated by the number of template layers and the difference in the number of times of slurry hanging between layers; the invention has simple process, strong operability and low cost .

Description

technical field [0001] The invention relates to the field of porous ceramics, in particular to a method for preparing layered slurry of titanium carbide gradient porous ceramics. Background technique [0002] Porous ceramic is a new type of functional material with stable physical and chemical properties and high porosity. It can be used as a material such as sound insulation, heat insulation, heat preservation, filtration, catalyst carrier, etc. , environmental protection and other fields. Due to different preparation methods, porous ceramics have different properties such as porosity and mechanical strength, so their functions and applications are also different. Porous ceramics prepared by particle stacking molding method have uniform pore distribution, and the pore size is proportional to the aggregate particle size. Porous ceramics with different pore sizes and shapes can be prepared by adding pore-forming agents, but the porosity is generally not more than 50%. If it...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/56C04B35/622C04B35/65C04B38/06
CPCC04B35/5611C04B35/622C04B35/65C04B38/0615C04B2235/668C04B2235/75C04B2235/96C04B38/0074
Inventor 周洋高文张永辉韩晓楠李世波黄振莺李翠伟于文波翟洪祥
Owner BEIJING JIAOTONG UNIV