Method for preparing single-phase ZrB2 powder by employing xylitol as carbon source through sol-gel method

A technology of xylitol and gel method, applied in the directions of boron/boride, metal boride, etc., to achieve the effects of simple equipment, low production cost and mild reaction conditions

Inactive Publication Date: 2015-09-09
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although sugars are non-polluting and have a high decomposition rate, when they interact with metal alkoxides to form colloids, they need to go through a series of complex and multi-step hydrolysis and polycondensation reactions

Method used

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  • Method for preparing single-phase ZrB2 powder by employing xylitol as carbon source through sol-gel method
  • Method for preparing single-phase ZrB2 powder by employing xylitol as carbon source through sol-gel method
  • Method for preparing single-phase ZrB2 powder by employing xylitol as carbon source through sol-gel method

Examples

Experimental program
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Effect test

Embodiment 1

[0054] The present invention provides a method for preparing single-phase ZrB by sol-gel method using xylitol as a carbon source 2 The powder method includes the following steps:

[0055] Step 1: Dissolve xylitol and boric acid in methanol (with a concentration of 99.9% by mass), stir magnetically under a water bath at 60°C until the first solution is formed; the stirring speed is 200r / min;

[0056] Step 2: Mix acetic acid (99% by mass) with zirconium n-propoxide (70% by mass) to form a second solution;

[0057] The mixing conditions are: mixing temperature 20°C, stirring speed 60r / min;

[0058] Step 3: Under the stirring speed of 200r / min, add the second solution to the first solution to form a homogeneous solution;

[0059] Dosage: Add 1.9g boric acid, 4.4g zirconium n-propoxide, 10ml methanol and 10ml acetic acid to 2g xylitol. The stirring adopts the digital display temperature measuring magnetic stirrer produced by Changzhou Huaguan Instrument Manufacturing Co., Ltd.

[0060] Step ...

Embodiment 2

[0067] The present invention provides a method for preparing single-phase ZrB by sol-gel method using xylitol as a carbon source 2 The powder method includes the following steps:

[0068] Step 1: Dissolve xylitol and boric acid in methanol (mass percentage concentration 99.9%), and magnetically stir under 55°C water bath to form the first solution; the stirring speed is 400r / min;

[0069] Step 2: Mix acetic acid (99% by mass) with zirconium n-propoxide (70% by mass) to form a second solution;

[0070] The mixing conditions are: mixing temperature 25°C, stirring speed 120r / min;

[0071] Step 3: Under the stirring speed of 200r / min, add the second solution to the first solution to form a homogeneous solution;

[0072] Dosage: Add 2.6 g of boric acid, 6.2 g of zirconium n-propoxide, 20 ml of methanol, and 20 ml of acetic acid to 2 g of xylitol.

[0073] Step 4: Place the homogeneous solution in a 60℃ water bath for 15 minutes to form a wet gel;

[0074] Step 5: Place the wet gel in a dry env...

Embodiment 3

[0080] The present invention provides a method for preparing single-phase ZrB by sol-gel method using xylitol as a carbon source 2 The powder method includes the following steps:

[0081] Step 1: Dissolve xylitol and boric acid in methanol (mass percentage concentration 99.9%), magnetically stir under 65°C water bath condition to form the first solution; the stirring speed is 300r / min;

[0082] Step 2: Mix acetic acid (99% by mass) and zirconium n-propoxide (70% by mass) to form a second solution; the mixing conditions are: mixing temperature 20°C, stirring speed 80r / min;

[0083] Step 3: Under the stirring speed of 200r / min, add the second solution to the first solution to form a homogeneous solution;

[0084] Dosage: Add 2.2 g of boric acid, 5.2 g of zirconium n-propoxide, 15 ml of methanol, and 15 ml of acetic acid to 2 g of xylitol.

[0085] Step 4: Place the homogeneous solution in a 60°C water bath for 10 minutes to form a wet gel;

[0086] Step 5: Place the wet gel in a dry enviro...

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Abstract

The invention discloses a method for preparing single-phase ZrB2 powder by employing xylitol as a carbon source through a sol-gel method. The sol-gel method employs xylitol, boric acid and zirconium n-propoxide as raw materials, precursor gel powder of ZrB2 can be obtained by adjusting mol ratio of C / Zr, then under argon protection, preheating and calcining for different heating and cooling are carried out, and then cooling in furnace is peformed to obtain the single-phase pure ZrB2 powder. The precursor gel powder can reach an uniform atom grade and molecular grade, component for a final synthetic material can be strictly controlled by calculating component of a reaction object. In addition, gel is not required for aging, production period is greatly shortened, through simple technology and equipment with low cost, gel with large specific surface area or powder can be obtained, and products purity is high.

Description

Technical field [0001] The invention relates to a sol-gel method for preparing ZrB 2 Powder, more specifically, refers to a method that uses xylitol as a carbon source, boric acid as a boron source, and organic alkoxide as a zirconium source to obtain ZrO through hydrolysis and polycondensation. 2 Preparation of ZrB by sol-gel method of precursor 2 Powder method. Background technique [0002] ZrB 2 Ceramics have the characteristics of high melting point, high strength, high hardness, good electrical and thermal conductivity, good flame retardancy, heat resistance, corrosion resistance, and trapping of concentrators, and are used in high-temperature structural ceramic materials, composite materials, refractory materials, and It has been widely developed and used in nuclear control materials and other fields and is one of the most promising ultra-high temperature ceramic materials. [0003] The basic principle of the sol-gel method is: the metal alkoxide or inorganic salt is hydrolyz...

Claims

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Application Information

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IPC IPC(8): C01B35/04
Inventor 李锐星赵月
Owner BEIHANG UNIV
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