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Zirconium boride based ceramic and preparation method thereof

A zirconium boride-based, zirconium boride technology, applied in the field of zirconium boride-based ceramics and its preparation, can solve problems such as difficult sintering and compaction, and achieve good compactness, high temperature resistance, good compactness and mechanical properties Effect

Active Publication Date: 2018-08-03
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But because of its strong covalent bond, it is difficult to sinter densely in the absence of sintering aids

Method used

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  • Zirconium boride based ceramic and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Step 1: add diammonium citrate, urea and ammoniacal liquor in deionized water, adjust the pH value to be 9.5, and carry out magnetic stirring under the rotating speed of 500 rpm, add zirconium boride (ZrB 2 ) powder, continue to stir for 2 hours, then add silicon nitride (Si 3 N 4 ) balls were ball milled at a speed of 300r / min. After 24 hours, add an appropriate amount of polyvinyl butyral (PVB) binder, and then ball mill for 24 hours, and pass the ball milled slurry through spray granulation equipment to prepare ZrB with a particle size of about 50 μm 2 Pellet balls.

[0032] Step 2: Mix ZrB with a volume ratio of 4:1 2 Pellet balls and zirconia (ZrO 2 ) powder was dissolved in acetone without ball milling medium, and ball milled on a roller ball mill for 8 hours to make ZrB 2 The surface of the granulation ball is coated with a layer of ZrO 2 powder, and after drying by rotary evaporation, a uniformly mixed ZrB 2 -ZrO 2 Mix powder. ZrB 2 -ZrO 2 Put the mix...

Embodiment 2

[0035] Step 1: Add diammonium citrate, urea and ammonia water to deionized water, adjust the pH value to 9.5, and perform magnetic stirring at a speed of 500 rpm, and add ZrB after 3 hours 2 powder, continue to stir for 2 hours, then add silicon nitride (Si 3 N 4 ) balls were ball milled at a speed of 300r / min. After 24 hours, add an appropriate amount of polyvinyl butyral (PVB) binder, and then ball mill for 24 hours, and pass the ball milled slurry through spray granulation equipment to prepare ZrB with a particle size of about 50 μm 2 Pellet balls.

[0036] Step 2: Mix ZrB with a volume ratio of 85:15 2 Pellet balls and zirconia (ZrO 2 ) powder was dissolved in acetone with a pH of 10.5, without ball milling medium, and ball milled on a roller ball mill for 8 hours to make ZrB 2 The surface of the granulation ball is coated with a layer of ZrO 2 powder, and after drying by rotary evaporation, a uniformly mixed ZrB 2 -ZrO 2 Mix powder. ZrB 2 -ZrO 2 Put the mixed p...

Embodiment 3

[0039] Step 1: add diammonium citrate, urea and ammoniacal liquor in deionized water, adjust the pH value to be 9.5, and carry out magnetic stirring under the rotating speed of 500 rpm, add zirconium boride (ZrB 2 ) powder, continue to stir for 2 hours, then add silicon nitride (Si 3 N 4 ) balls were ball milled at a speed of 300r / min. After 24 hours, add an appropriate amount of polyvinyl butyral (PVB) binder, and then ball mill for 24 hours, and pass the ball milled slurry through spray granulation equipment to prepare ZrB with a particle size of about 50 μm 2 Pellet balls.

[0040] Step 2: Mix ZrB with a volume ratio of 85:15 2 Pellet balls and zirconia (ZrO 2) powder was dissolved in ethanol with a pH of 10.5, without ball milling medium, and ball milled on a roller mill for 8 hours to make ZrB 2 The surface of the granulation ball is coated with a layer of ZrO 2 powder, and after drying by rotary evaporation, a uniformly mixed ZrB 2 -ZrO 2 Mix powder. ZrB 2 -ZrO...

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Abstract

The invention relates to the field of ceramic materials, in particular to a zirconium boride based ceramic and a preparation method thereof. The preparation method of the zirconium boride based ceramic provided by the invention comprises the following steps: step one, preparing zirconium boride pelleting balls through a pelleting technology under alkaline conditions, and mixing the zirconium boride pelleting balls with zirconium dioxide powder to obtain zirconium boride and zirconium dioxide composite powder; and step two, carrying out glue removal on the zirconium boride and zirconium dioxidecomposite powder, carrying out spark plasma sintering, and carrying out flashing burning with the help of an external electric field to obtain the zirconium boride based ceramic. Zirconium dioxide with a three-dimensional network structure is distributed around zirconium boride, and the temperature in the flash burning process is higher than the temperature inside a furnace, so that the temperature required for sintering densification of the zirconium boride based ceramic is reached, and flash burning of the zirconium boride based ceramic is realized. According to the method, the zirconium boride based ceramic can be prepared quickly, and the zirconium boride based ceramic is good in densification performance and high in high-temperature resistance and can be widely applied to the fieldsof heating elements, aerospace devices, and the like.

Description

technical field [0001] The invention relates to the field of ceramic materials, in particular to a zirconium boride-based ceramic and a preparation method thereof. Background technique [0002] Because zirconium boride has the characteristics of high strength, high hardness, high melting point, good electrical conductivity, thermal conductivity, flame retardancy, oxidation resistance and corrosion resistance, zirconium boride-based ultra-high temperature ceramics have become a hot material for hypersonic aircraft. The most promising candidates for components such as defense systems and rocket propulsion systems. But because of its strong covalent bond, it is difficult to sinter densely in the absence of sintering aids. [0003] Flash firing technology, as a new electric field assisted ceramic sintering method, has been developed rapidly in recent years, but flash firing is also mainly used in ceramic materials such as ion conductors, insulators, and semiconductors. However...

Claims

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Application Information

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IPC IPC(8): C04B35/58C04B35/64
CPCC04B35/58078C04B35/64C04B2235/3244C04B2235/666C04B2235/74C04B2235/77C04B2235/786
Inventor 郭伟明曾令勇魏万鑫林华泰
Owner GUANGDONG UNIV OF TECH
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