Boride-silicon carbide multiple phase ceramic and its preparation method

A multiphase ceramic and boride technology, applied in the field of non-oxide multiphase ceramics, can solve the problem that a single boride ceramic cannot meet the requirements at the same time, achieve excellent mechanical properties and thermal properties, strong industrial practicability, and reduce the sintering temperature. Effect

Inactive Publication Date: 2006-07-26
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, single boride ceramics cannot simultaneously meet the physical, chemical, mechanical and structural properties required at ultra-high temperatures

Method used

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  • Boride-silicon carbide multiple phase ceramic and its preparation method
  • Boride-silicon carbide multiple phase ceramic and its preparation method
  • Boride-silicon carbide multiple phase ceramic and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] For the preparation of ZrB-containing 2 -Composite material with (SiC+C)20% volume content, ZrB 2 Add 8.8 grams of powder into the gasoline solution dissolved with 1.2 grams of PCS, mix and grind with zirconia balls for 12 hours, then pour it into a shallow container while stirring to vaporize the gasoline, and obtain coated ZrB 2 powder. The coated powder is pyrolyzed at 800° C. in a flowing argon atmosphere to obtain ceramic mixed powder. Then put the powder into a graphite mold and sinter by hot pressing at 1800° C. in an argon protective atmosphere with a hot pressing pressure of 20 MPa and a holding time of 60 min. The properties of the obtained materials are listed in Table 1.

Embodiment 2

[0043] For the preparation of ZrB-containing 2 -Composite material with (SiC+C) 20% volume content, 1.2 grams of PCS powder is directly mixed with 8.8 grams of ZrB 2 Powder mix. The mixed powder is cracked at 800° C. in a flowing argon atmosphere to obtain ceramic mixed powder. Then put the powder into a graphite mold and sinter by hot pressing at 1800° C. in an argon protective atmosphere with a hot pressing pressure of 20 MPa and a holding time of 60 min. The properties of the obtained materials are listed in Table 1.

Embodiment 3

[0045] Samples were obtained in exactly the same manner as in Example 1, except that they were hot-pressed and sintered at 1700°C. The properties of the obtained materials are listed in Table 1.

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Abstract

The invention provides a preparation method for the boride-silicon carbide multiple-phase ceramic by thermal pressing at 1700~1900Deg with 1-12wt% zirconium boride, titanium boride and hafnium boride by the activity of silicon carbide from polysilane cracking. Wherein, the active carbon is packed and combines with the bride. This invention needs not other auxiliary-fire agent to ensure material performance at high temperature, and improves the composite material properties.

Description

technical field [0001] The invention relates to boride-silicon carbide composite ceramics and a preparation method thereof, including titanium boride-silicon carbide (TiB 2 -SiC) composite ceramics, zirconium boride-silicon carbide (ZrB 2 -SiC) composite ceramics and hafnium boride-silicon carbide (HfB 2 -SiC) composite phase ceramics and preparation method thereof. It belongs to the field of non-oxide composite ceramics. Background technique [0002] Transition metal boride ceramics are used in aerospace ultra-high temperature ceramic materials, cutting tools and wear-resistant materials, electrode materials, and glass It is widely used in containers and protective materials that are in contact with molten metal. If the performance of boride ceramics can be improved through a certain way, such as adding a second phase of silicon carbide to improve its oxidation resistance, the obtained boride composite ceramics can be used more widely. Boride composite phase ceramics a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/58C04B35/565C04B35/622C04B35/645C04B35/65
Inventor 张国军阚艳梅王佩玲
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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