Thermal-shock-resistant ultrahigh-temperature ceramic and preparation method thereof

A technology of ultra-high temperature ceramics and thermal shock resistance, applied in the field of ultra-high temperature ceramics, to achieve the effect of simple process, low shear modulus and easy realization

Active Publication Date: 2016-10-12
AEROSPACE RES INST OF MATERIAL & PROCESSING TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But so far no YbB 6 Report on the properties of ultra-high temperature ceramic materials and their preparation methods

Method used

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  • Thermal-shock-resistant ultrahigh-temperature ceramic and preparation method thereof
  • Thermal-shock-resistant ultrahigh-temperature ceramic and preparation method thereof
  • Thermal-shock-resistant ultrahigh-temperature ceramic and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] Will Yb 2 o 3Weigh the B raw material powder according to the molar ratio of Yb:B=1:6.2, add absolute ethanol, and mix with a drum mixer for 12 hours at a speed of 120 rpm, and vacuum the uniformly mixed raw materials at 25°C Dry for 48 hours to get Yb 2 o 3 Mix powder with B; Yb 2 o 3 Put the powder mixed with B into a high-temperature carbon tube furnace and heat it to 1680°C at a heating rate of 10°C / min for 1 hour to obtain YbB 6 Ultra-high temperature ceramic powder, its Raman spectrum is as follows figure 1 shown. Will YbB 6 The ultra-high temperature ceramic powder was ball-milled with WC balls at a speed of 300 rpm for 10 hours in absolute ethanol medium, and dried under vacuum at 30°C for 24 hours. The dried YbB 6 Put the ultra-high temperature ceramic powder into a graphite mold with a diameter of 50 mm, and dry-press 5 times under a cyclic loading pressure of 10 MPa, and hold the pressure for 2 minutes each time to obtain YbB 6 Ultra-high temperature...

Embodiment 2

[0064] Will Yb 2 o 3 and B 4 C The raw material powder is weighed according to the molar ratio of Yb:B=1:6.3, adding absolute ethanol, mixing with a drum mixer for 15 hours at a speed of 100 rpm, and vacuum-drying the uniformly mixed raw materials at a temperature of 28°C 30 hours to get Yb 2 o 3 and B 4 C mixed powder; Yb 2 o 3 and B 4 C mixed powder was put into a high-temperature carbon tube furnace and heated to 1600°C at a heating rate of 8°C / min for 2 hours to obtain YbB 6 Ultra-high temperature ceramic powder. Will YbB 6 The ultra-high temperature ceramic powder was milled with WC balls at a speed of 350 rpm in an anhydrous ethanol medium for 8 hours, and dried under vacuum at 28°C for 30 hours, and the dried YbB 6 Put the ultra-high temperature ceramic powder into a graphite mold with a diameter of 50 mm, and dry-press 8 times under a cyclic loading pressure of 10 MPa, and hold the pressure for 1 minute each time to obtain YbB 6 Ultra-high temperature cerami...

Embodiment 3

[0066] Will Yb 2 o 3 and B 4 C The raw material powder is weighed according to the molar ratio of Yb:B=1:6.5, adding absolute ethanol, mixing with a drum mixer for 24 hours at a speed of 100 rpm, and vacuum-drying the uniformly mixed raw materials at a temperature of 30°C 36 hours to get Yb 2 o 3 and B 4 C mixed powder; Yb 2 o 3 and B 4 C mixed powder was put into a high-temperature carbon tube furnace and heated to 1500°C at a heating rate of 15°C / min for 4 hours to obtain YbB 6 Ultra-high temperature ceramic powder. Will YbB 6 The ultra-high temperature ceramic powder was milled with WC balls in absolute ethanol medium at a speed of 400 rpm for 6 hours, and dried under vacuum at 25°C for 48 hours, and the dried YbB 6 Put the ultra-high temperature ceramic powder into a graphite mold with a diameter of 50 mm, and dry-press 3 times under a cyclic loading pressure of 15 MPa, and hold the pressure for 3 minutes each time to obtain YbB 6 Ultra-high temperature ceramic ...

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Abstract

The invention relates to thermal-shock-resistant YbB6 ultrahigh-temperature ceramic and a preparation method thereof and belongs to the field of ultrahigh-temperature ceramic. The thermal-shock-resistant YbB6 ultrahigh-temperature ceramic has the advantages of high purity, high compactness, high strength, low elastic modulus, low shear modulus and high thermal shock resistance. The preparation method includes: utilizing high-temperature reaction to synthesize and prepare YbB6 ultrahigh-temperature ceramic powder; performing ball milling and high-temperature hot press sintering to prepare a compact YbB6 ultrahigh-temperature ceramic material. The method particularly includes: using Yb2O3 and B4C (or Yb2O3 and B) powder as raw materials, mixing according to different proportions, and obtaining high-purity YbB6 ultrahigh-temperature ceramic powder through high-temperature reaction of 1500-1750 DEG C; subjecting the YbB6 ultrahigh-temperature ceramic powder to mechanical ball milling, dry press forming and high-temperature hot press sintering at 1850-2000 DEG C to obtain compact YbB6 ultrahigh-temperature ceramic having high purity, high compactness, high strength, low elastic modulus, low shear modulus and high thermal shock resistance. The preparation method of the YbB6 ultrahigh-temperature ceramic is simple in process and needless of adding of forming auxiliary and second sintering auxiliary.

Description

technical field [0001] The invention relates to a thermal shock resistant YbB 6 An ultra-high temperature ceramic and a preparation method thereof belong to the field of ultra-high temperature ceramics. Background technique [0002] Boride ultra-high temperature ceramics are candidate materials for key structural parts such as the nose cone and sharp leading edge of a hypersonic approaching space vehicle, and the leading edge support plate of a scramjet engine. It is also an anti-oxidation C / C and modified C / SiC The key matrix components of ultra-high temperature heat-resistant materials and the raw materials for surface anti-oxidation and anti-ablation coatings. Existing ultra-high temperature materials are difficult to meet the requirements of long-term, heat, force and corrosion coupling environments in extreme environments, making ultra-high temperature materials one of the technical bottlenecks restricting the development of hypersonic vehicles and their propulsion sys...

Claims

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Application Information

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IPC IPC(8): C04B35/58C04B35/622C04B35/645C04B35/626
CPCC04B35/5805C04B35/622C04B35/626C04B35/62605C04B35/62615C04B35/645C04B2235/3224C04B2235/77C04B2235/96C04B2235/9607
Inventor 周延春王晓飞向会敏
Owner AEROSPACE RES INST OF MATERIAL & PROCESSING TECH
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