Potassium titanate whisker( K2O.6TiO2) preparation method

A technology of potassium hexatitanate whiskers and porous materials, which can be used in ceramic products, applications, household appliances, etc. It can solve the problems of complex process, high density, and many reactions, and achieve cheap raw materials, reduced strength loss, and easy preparation The effect of simple process

Inactive Publication Date: 2006-02-08
NANJING UNIV OF TECH
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  • Application Information

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Problems solved by technology

Many scholars add reaction raw materials (titanium-containing oxides and potassium-containing compounds) to potassium hexatitanate or directly use precursors to prepare potassium titanate ceramics. [12] , although the strength has been improved, but due to many reactions and complex processes, there are generally multiple phases, and the strong phase change reaction causes high density, small porosity, and low liquid holding capacity (water absorption rate 1.25 %, JP60231464) and material deformation are not easy to solve

Method used

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  • Potassium titanate whisker( K2O.6TiO2) preparation method
  • Potassium titanate whisker( K2O.6TiO2) preparation method
  • Potassium titanate whisker( K2O.6TiO2) preparation method

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Embodiment 1

[0027] Potassium hexatitanate whiskers prepared from reactive precursors of titanium-containing amorphous compounds and potassium-containing compounds [15] and potassium tetratitanate whiskers were sieved separately, weighed and then mixed with potassium carbonate evenly, wherein potassium hexatitanate whiskers were 50 mol%, potassium tetratitanate whiskers were 45 mol%, and potassium carbonate was 5 mol%. The mixture is sieved again, and hydraulically formed in a mould, and the green body is in the shape of a cuboid. After preliminary drying, put it into a muffle furnace for roasting at 950°C, cool it down to room temperature naturally, and finally wash it with water. The obtained potassium hexatitanate whisker porous material has a maximum deformation rate of 3.3%, and no cracks on the surface ( figure 1 , figure 2 ), the flexural strength is 14.12MPa, the porosity is 30.53%, and the most probable pore diameter is 0.8μm; the strength loss is 15% after the alkali resistanc...

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Abstract

Disclosed is a process for preparing potassium hexatitanate whisker material with high factor of porosity, high bending strength, strong caustic corrosion resistance, low rate of deformation and high liquid holdup, which consists of charging mixture of other types of titanates and potassium-containing compound into potassium hexatitanate whisker, then carrying out granulating, modeling, sintering at 700-1050 deg. C, and water scrubbing.

Description

technical field [0001] The invention belongs to the technical field of preparation of porous materials, in particular to a preparation method of potassium hexatitanate whisker porous materials. Background technique [0002] Porous ceramics have a wide range of applications in filtration, separation, and various catalytic reactions. α-Al 2 o 3 , ZrO 2 and TiO 2 It is the main material for the preparation of ceramic membrane supports at present. Due to α-Al 2 o 3 It has good thermal stability, stable crystal form at high temperature and low price, so it is the most widely used commercial ceramic membrane support and catalyst carrier. But Al 2 o 3 As a typical amphoteric oxide, it has poor corrosion resistance in non-neutral solutions [1] . Studies have shown that dense Al 2 o 3 After the sintered body was reacted in a high-concentration NaOH solution of 25mol / Kg at 150°C for 5 days, the mass loss was as high as 20%, accompanied by a sharp drop in flexural strength...

Claims

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Application Information

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IPC IPC(8): C04B35/462C04B35/622C04B38/00
Inventor 陆小华周亚新何明杨祝红冯新刘畅
Owner NANJING UNIV OF TECH
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