A kind of method is the method for synthesizing mullite whisker with kalephine as raw material

A technology for synthesizing mullite and potassium nepheline, applied in chemical instruments and methods, single crystal growth, single crystal growth and other directions, can solve the problems of complicated preparation process, high preparation cost, high price and the like, and achieves simplified reaction process, The effect of reducing the reaction temperature of molten salt and low cost

Active Publication Date: 2020-09-22
SHAANXI DAQIN POTASSIUM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most of this method uses alkoxides as raw materials, which are expensive and costly to prepare, and because the hydrolysis rates of alkoxides are different, the preparation process is complicated and difficult to control.

Method used

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  • A kind of method is the method for synthesizing mullite whisker with kalephine as raw material
  • A kind of method is the method for synthesizing mullite whisker with kalephine as raw material

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Experimental program
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Effect test

Embodiment 1

[0021] Step 1: Kalnite, deionized water, H 2 SO 4 (mass concentration 98%) and Al 2 (SO 4 ) 3 Mix at a molar ratio of 1:5:0.1:0.4 to make a suspension;

[0022] Step 2: Add the prepared suspension into the reaction kettle, place the reaction kettle in a microwave hydrothermal reactor for hydrothermal reaction, the reaction temperature is 120°C, the reaction time is 80min, the filling ratio of the reaction kettle is 0.4;

[0023] Step 3: Pour the liquid in the reactor after the microwave hydrothermal reaction into an evaporating dish, and place the evaporating dish in an oven for drying; the drying temperature is 50°C, and the drying time is 10 hours;

[0024] Step 4: Put the dried product in a muffle furnace for molten salt reaction, and the reacted product is ground, washed with water, and centrifuged to remove the molten salt adsorbed on the surface, and the obtained product is mullite whisker. Wherein, the molten salt reaction temperature is 400° C., and the reaction ...

Embodiment 2

[0027] Step 1: Kalnite, deionized water, H 2 SO 4 (mass concentration 98%) and Al 2 (SO 4 ) 3 Mix at a molar ratio of 1:5:0.2:0.6 to make a suspension;

[0028] Step 2: Add the prepared suspension into the reaction kettle, place the reaction kettle in a microwave hydrothermal reactor for hydrothermal reaction, the reaction temperature is 140°C, the reaction time is 60min, the filling ratio of the reaction kettle is 0.5;

[0029] Step 3: Pour the liquid in the reactor after the microwave hydrothermal reaction into an evaporating dish, and place the evaporating dish in an oven for drying; the drying temperature is 60°C, and the drying time is 8 hours;

[0030] Step 4: Put the dried product in a muffle furnace for molten salt reaction, and the reacted product is ground, washed with water, and centrifuged to remove the molten salt adsorbed on the surface, and the obtained product is mullite whisker. Wherein, the molten salt reaction temperature is 500° C., and the reaction t...

Embodiment 3

[0035] Step 1: Kalnite, deionized water, H 2 SO 4 (mass concentration 98%) and Al 2 (SO 4 ) 3 Mix at a molar ratio of 1:5:0.3:0.8 to make a suspension;

[0036] Step 2: Add the prepared suspension into the reaction kettle, place the reaction kettle in a microwave hydrothermal reactor for hydrothermal reaction, the reaction temperature is 160°C, the reaction time is 40min, the filling ratio of the reaction kettle is 0.5;

[0037]Step 3: Pour the liquid in the reactor after the microwave hydrothermal reaction into an evaporating dish, and place the evaporating dish in an oven for drying; the drying temperature is 70°C, and the drying time is 6 hours;

[0038] Step 4: Put the dried product in a muffle furnace for molten salt reaction, and the reacted product is ground, washed with water, and centrifuged to remove the molten salt adsorbed on the surface, and the obtained product is mullite whisker. Wherein, the molten salt reaction temperature is 600° C., and the reaction ti...

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Abstract

The invention discloses a method for synthesizing mullite whisker by taking kaliophilite as a raw material. The method comprises the following steps: mixing mullite, deionized water, sulfuric acid andAl2(SO4)3 to obtain turbid liquid; adding the turbid liquid into a reaction still, putting the reaction still into a microwave hydrothermal reaction apparatus and carrying out hydrothermal reaction at the reaction temperature of 120 to 180 DEG C for 20 to 80 minutes; drying liquid in the reaction still after microwave reaction, then carrying out molten salt reaction, and washing a reacted productto obtain the mullite whisker. According to the method disclosed by the invention, the mullite as a raw material can be used as a precursor of the mullite whisker and can simultaneously provide molten salt substances for reaction, so that reaction cost is reduced and reaction procedures are simplified. Nanoscale oxide particles can be formed in a microwave hydrothermal system, the reaction temperature of molt salts is reduced, and whisker with high aspect ratio is favorably obtained. The preparation method disclosed by the invention has the advantages of low cost, low reaction temperature, simple process, good repeatability, high yield and the like.

Description

technical field [0001] The invention belongs to the technical field of preparation of ceramic whiskers, and in particular relates to a method for synthesizing mullite whiskers from kappa nepheline. Background technique [0002] Mullite whiskers not only have excellent properties such as high temperature resistance, wear resistance and oxidation resistance, but also have the characteristics of high temperature strength, small high temperature creep, small thermal expansion and good thermal shock resistance. Therefore, it is an excellent composite material reinforcement, which can significantly improve the comprehensive performance of ceramic matrix composites. At present, the methods for synthesizing mullite whiskers at home and abroad mainly include mineral decomposition method, molten salt method and traditional hydrolytic sol-gel method. The mineral decomposition method refers to the direct use of clay and other minerals as raw materials. After high-temperature calcinatio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C30B7/10C30B29/34C30B29/62
CPCC30B7/10C30B29/34C30B29/62
Inventor 茹广川欧阳海波周镇峰法敏岐许占位
Owner SHAANXI DAQIN POTASSIUM CO LTD
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