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A single-phase zrb prepared by sol-gel method using xylitol as carbon source 2 powder method

A technology of xylitol and gel method, which is applied in the direction of boron/boride, metal boride, etc., to achieve the effect of simple equipment, mild reaction conditions, and low price and cost

Inactive Publication Date: 2016-09-07
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • A single-phase zrb prepared by sol-gel method using xylitol as carbon source <sub>2</sub> powder method
  • A single-phase zrb prepared by sol-gel method using xylitol as carbon source <sub>2</sub> powder method
  • A single-phase zrb prepared by sol-gel method using xylitol as carbon source <sub>2</sub> powder method

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Effect test

Embodiment 1

[0054] The present invention proposes a method of preparing single-phase ZrB by using xylitol as a carbon source through a sol-gel method. 2 The method of powder, this method comprises the following steps:

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

[0056] Step 2: mixing acetic acid (mass percentage concentration 99%) and n-propoxide zirconium (mass percentage concentration 70%) to form a second solution;

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

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

[0059] Dosage: Add 1.9g of boric acid, 4.4g of zirconium n-propoxide, 10ml of methanol, and 10ml of acetic acid to 2g of xylitol. Stirring adopts a magnetic stirrer with digital displ...

Embodiment 2

[0067] The present invention proposes a method of preparing single-phase ZrB by using xylitol as a carbon source through a sol-gel method. 2 The method of powder, this method comprises the following steps:

[0068] Step 1: dissolving xylitol and boric acid in methanol (99.9% concentration by mass), and stirring magnetically in a water bath at 55°C until the first solution is formed; the stirring speed is 400r / min;

[0069] Step 2: mixing acetic acid (mass percentage concentration 99%) and n-propoxide zirconium (mass percentage concentration 70%) to form a second solution;

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

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

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

[0073] Step 4: Place the homogeneous solution in a water b...

Embodiment 3

[0080] The present invention proposes a method of preparing single-phase ZrB by using xylitol as a carbon source through a sol-gel method. 2 The method of powder, this method comprises the following steps:

[0081] Step 1: dissolving xylitol and boric acid in methanol (mass percentage concentration 99.9%), and magnetically stirring in a water bath at 65°C until the first solution is formed; the stirring speed is 300r / min;

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

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

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

[0085] Step 4: Place the homogeneous solution in a water b...

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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 method for preparing ZrB by sol-gel method 2 Powder, more specifically, refers to a method that uses xylitol as a carbon source, boric acid as a boron source, organic alkoxide as a zirconium source, and obtains ZrO through hydrolysis and polycondensation. 2 Preparation of ZrB from Precursor by Sol-Gel Method 2 powder method. Background technique [0002] ZrB 2 Ceramics are widely used in high-temperature structural ceramic materials, composite materials, refractory materials and It has been widely developed and utilized 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 hydrolyzed to directly form a sol or a sol is formed by degelation, then the solute is polymerized and gelled, and then the gel is dried and roasted to remove the organic components, and final...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B35/04
Inventor 李锐星赵月
Owner BEIHANG UNIV
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