Superhigh-temperature SiC-HfB2 composite ceramic and preparation method and application thereof

A composite ceramic, sic-hfb2 technology, applied in the field of ceramic materials, can solve the problems of performance evaluation, powder particle growth, composite material performance to be studied, etc., to improve high temperature performance and oxidation resistance, high purity, Excellent antioxidant effect

Inactive Publication Date: 2019-04-23
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Patent CN201611021565.3 prepared finer boride powder through simple boron thermal reaction, but it is unstable at high temperature, and the powder particles will grow up at 1800°C. Patent CN201810535363.3 uses the same method to in-situ solid dissolve trace Ta, to prepare ultra-fine boride powder, and its powder performance is stable, and the particles will not grow up above 1800 °C
However, the performance of the above-mentioned synthesized boride powder with small particle size and high purity after sintering has not yet been evaluated, and the performance of the composite material prepared by mixing and sintering with SiC remains to be studied

Method used

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  • Superhigh-temperature SiC-HfB2 composite ceramic and preparation method and application thereof
  • Superhigh-temperature SiC-HfB2 composite ceramic and preparation method and application thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] 1. SiC (powder purity 99.9%, particle size 1μm), HfO 2 (powder purity 99.9%, particle size 1μm), Ta 2 o 5(powder purity 99%, particle size 1 μm) and amorphous boron powder (purity 95.6%, particle size 1 μm) as raw materials, SiC powder, HfO 2 Powder, Ta 2 o 5 The molar ratio of the powder is 39:10:1, amorphous boron powder and HfO 2 The molar ratio is 4:1, amorphous boron powder and Ta 2 o 5 The molar ratio of the mixture is 8.8:1, adding a solvent and a ball milling medium for mixing, mixing on a ball mill for 24 hours, and obtaining a mixed powder after drying.

[0032] 2. Put the molded green body of the mixed powder into a graphite crucible, raise the temperature to 1000°C at a rate of 15°C / min and keep it for 1h, and then raise the temperature to 1600°C at a rate of 10°C / min and keep it for 2h to obtain SiC- HfB 2 Powder.

[0033] 3. SiC-HfB 2 Put the powder into a graphite mold, use spark plasma sintering to heat up to 1400°C at a rate of 150°C / min, fill...

Embodiment 2

[0036] 1. SiC (powder purity 99.9%, particle size 2μm), HfO 2 (powder purity 99.9%, particle size 2μm), Ta 2 o 5 (Powder purity 99%, particle size 2μm) and amorphous boron powder (purity 95.6%, particle size 2μm) as raw materials, SiC powder, HfO 2 Powder, Ta 2 o 5 The molar ratio of powder is 39.2:10:0.8, amorphous boron powder and HfO 2 The molar ratio is 4:1, amorphous boron powder and Ta 2 o 5 The molar ratio is 8.8:1, adding solvent and ball milling medium for mixing, mixing on a ball mill for 24 hours, and obtaining mixed powder after drying.

[0037] 2. Put the molded green body of the mixed powder into a graphite crucible, raise the temperature to 1000°C at a rate of 15°C / min and keep it for 1h, and then raise the temperature to 1500°C at a rate of 10°C / min and keep it for 2h to obtain SiC- HfB 2 Powder.

[0038] 3. SiC-HfB 2 Put the powder into a graphite mold, use spark plasma sintering to heat up to 1400°C at a rate of 150°C / min, fill with a protective atm...

Embodiment 3

[0041] 1. SiC (powder purity 99.9%, particle size 1μm), HfO 2 (powder purity 99.9%, particle size 1μm), Ta 2 o 5 (powder purity 99%, particle size 1 μm) and amorphous boron powder (purity 95.6%, particle size 2 μm) as raw materials, SiC powder, HfO 2 Powder, Ta 2 o 5 The molar ratio of the powder is 38.4:10:1.6, amorphous boron powder and HfO 2 The molar ratio is 4:1, amorphous boron powder and Ta 2 o 5 The molar ratio of the mixture is 8.8:1, adding a solvent and a ball milling medium for mixing, mixing on a ball mill for 24 hours, and obtaining a mixed powder after drying.

[0042] 2. Put the molded green body of the mixed powder into a graphite crucible, raise the temperature to 1100°C at a rate of 15°C / min and keep it for 2 hours, and then raise the temperature to 1600°C at a rate of 10°C / min and keep it for 2 hours to obtain SiC- HfB 2 Powder.

[0043] 3. SiC-HfB 2 Put the powder into a graphite mold, use spark plasma sintering to heat up to 1500°C at a rate of ...

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Abstract

The invention belongs to the technical field of ceramic materials and discloses superhigh-temperature SiC-HfB2 composite ceramic and a preparation method and application thereof. The superhigh-temperature SiC-HfB2 composite ceramic is prepared by: adding a solvent and a ball milling medium into SiC powder, HfO2 powder, Ta2O5 powder and amorphous boron powder, mixing, drying to obtain mixed powder,die-pressing the mixed powder to obtain a mixed powder blank, thermally treating in vacuum, heating to 900-1300 DEG C, carrying out temperature holding I, heating to 1500-1800 DEG C, carrying out temperature holding II, thermally treating in vacuum to obtain SiC-HfB2 powder, performing discharge plasma sintering to heat the SiC-HfB2 powder to 1000-1400 DEG C, injecting a protective atmosphere, heating to 1800-2200 DEG C, and calcining. The superhigh-temperature SiC-HfB2 composite ceramic has good resistance to high temperature.

Description

technical field [0001] The invention belongs to the technical field of ceramic materials, and more specifically relates to an ultra-high temperature SiC-HfB 2 Composite ceramics and their preparation methods and applications. Background technique [0002] In recent years, research on the properties of SiC has attracted the interest of many researchers. Silicon carbide (SiC) ceramics have the advantages of excellent breakdown resistance, wear resistance, chemical stability, and radiation resistance, making them widely used in China. For example, SiC ceramics is one of the five most valuable ceramic materials for armor applications. It has good oxidation resistance, but its high temperature performance needs to be improved. HfB 2 As a kind of transition metal ultra-high-temperature ceramics, it has excellent properties such as high melting point, high hardness, corrosion resistance, and large neutron absorption cross-section. Its composite material with SiC will have more e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/565C04B35/58C04B35/622
CPCC04B35/565C04B35/58078C04B35/622C04B2235/3251C04B2235/3813C04B2235/3826C04B2235/5445C04B2235/602C04B2235/656C04B2235/6562C04B2235/6567C04B2235/658C04B2235/666C04B2235/77C04B2235/786C04B2235/96C04B2235/9607
Inventor 江泽斌张岩郭伟明吴利翔林华泰
Owner GUANGDONG UNIV OF TECH
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