Process for preparing coated ZrB2 composite powder

A composite powder and coating technology is applied in the field of preparation of coated inorganic powder, which can solve problems such as performance degradation, and achieve the effects of good oxidation resistance, excellent physics and simple operation.

Inactive Publication Date: 2008-11-26
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome ZrB 2 Ceramic materials are easily oxidized at high temperatures, resulting in performance degradation. Provide a coated ZrB with good oxidation resistance at high temperatures 2 Preparation method of composite powder

Method used

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  • Process for preparing coated ZrB2 composite powder
  • Process for preparing coated ZrB2 composite powder
  • Process for preparing coated ZrB2 composite powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] 3 g ZrB 2 Add the powder into 200ml of water, ultrasonically disperse for 5 minutes, and stir evenly to obtain ZrB 2 Slurry of powder and water; drop 300ml of mixed solution (150ml of 0.12mol / L aluminum nitrate and 150ml of 0.2mol / L yttrium nitrate) into the slurry at a constant speed in 180 minutes, and drop the precipitant of pH=11 at the same time Ammonia regulates ZrB 2 The pH value of the slurry is always 9. Stir continuously with a stirrer. After the mixed solution is added dropwise, continue to stir for 1 hour, and keep the pH value at 9 to obtain the precursor of the coating layer coated ZrB 2 The composite powder of the powder; the composite powder was washed three times and once with deionized water and absolute ethanol respectively, then dried at 80°C and calcined at 500°C to obtain Al 2 o 3 and Y 2 o 3 co-coated ZrB 2 Coated ZrB powder particles 2 Composite powder. Coated ZrB 2 The thickness of the cladding layer of the composite powder is about 30n...

Embodiment 2

[0019] 3 g ZrB 2 Add the powder into 200ml of water, ultrasonically disperse for 5 minutes, and stir evenly to obtain ZrB 2 A slurry of powder and water; drop 200ml of 0.05mol / L zirconium hypochlorite solution into the slurry at a constant speed for 120 minutes, and drop the precipitant ammonia water with pH=11 at the same time to adjust ZrB 2 The pH value of the slurry is always 9, and the stirrer is used to stir continuously. After the zirconium hypochlorite solution is added dropwise, the stirring is continued for 1 hour, and the pH value is kept at 9, and the precursor coated ZrB of the coating layer is obtained. 2 The composite powder of the powder; the composite powder was washed three times and one time with deionized water and absolute ethanol respectively, then dried at 100°C and calcined at 600°C to obtain ZrO 2 Coated ZrB 2 Coated ZrB powder particles 2 Composite powder. Coated ZrB 2 The thickness of the coating layer of the composite powder is about 25nm, dens...

Embodiment 3

[0021] 3 g ZrB 2 Add the powder into 150ml of water, ultrasonically disperse for 5 minutes, and stir evenly to obtain ZrB 2 Slurry of powder and water; drop 150ml of 0.15mol / L yttrium sulfate solution into the slurry at a constant speed in 180 minutes, and drop sodium hydroxide solution of pH=10 at the same time as a precipitant to adjust ZrB 2 The pH value of the slurry is always 9. Stir continuously with a stirrer. After the mixed solution is added dropwise, continue to stir for 1 hour, and keep the pH value at 9 to obtain the precursor of the coating layer coated ZrB 2 The composite powder of the powder; the composite powder was washed three times and once with deionized water and absolute ethanol respectively, then dried at 80°C and calcined at 500°C to obtain Y 2 o 3 Coated ZrB 2 Coated ZrB powder particles 2 Composite powder. Coated ZrB 2 The thickness of the cladding layer of the composite powder is about 20nm, dense and uniform.

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Abstract

The invention relates to a method for preparation of inorganic powder with antioxidation susceptibility in the form of cladding. The method for preparation of composite powder of zirconium diboride in the form of cladding is characterized in that it contains the following steps: 1) mixing and stirring equably the mixture of the powder of zirconium diboride and the water with a proportion of 1 gram: 50-1000 milliliters to get the miscible liquid; 2) adding 1-100 kinds of saline solution in a same proportion as the former step, at the same time, adding precipitating reagents of PH value of 8-12 with the quantity added which can keep the PH value of the miscible liquid at 7-11.5 into the miscible liquid, obtaining composite powder of zirconium diboride in the form of cladding which is precursor of the cladding; and the said precipitating reagents is the materials generated by hydroxide ion of the water solution; 3) obtaining the products by washing, drying at 80-150 DEG C and calcining at 300-700 DEG C the composite powder. The invention is characterized in that it is of simple and convenient operation, easy control, low energy consumption, and good antioxidation susceptibility of the obtained composite powder of zirconium diboride in the form of cladding at the high temperature.

Description

technical field [0001] The invention relates to a method for preparing a coated inorganic powder with anti-oxidation properties, in particular to a coated ZrB 2 Preparation method of composite powder. Background technique [0002] The development of modern high-temperature technology requires materials to have excellent high-temperature comprehensive properties to adapt to harsh operating environments. Oxide-non-oxide composite materials are a kind of promising high-temperature structural materials, which use the complementarity of material properties to achieve comprehensive optimization of materials, ZrB 2 Composite ceramic materials are one of them. [0003] ZrB 2 Ceramics have high melting point (3040°C), high hardness (88~91HRA), high strength (compressive strength, tensile strength are 1555.3MPa, 460MPa respectively), good electrical conductivity (conductivity is 16.6×10 -5 Ω·cm, the temperature coefficient of resistance is 1.76×10 3 ℃ -1 ), good thermal conducti...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/58C04B35/622
Inventor 张联盟宋杰光李俊国宋建荣沈强
Owner WUHAN UNIV OF TECH
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